Revert "fix(bookmarks): upsert on title conflict so position upgrades don't 500"

This reverts commit 27b3dcb69f.

LICENSE

@@ -1,232 +1,661 @@
-GNU GENERAL PUBLIC LICENSE
-Version 3, 29 June 2007
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-     bookhoard
-      Copyright (C) 2026  john-okeefe
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+                    GNU AFFERO GENERAL PUBLIC LICENSE
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+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
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+  The "source code" for a work means the preferred form of the work
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+can regenerate automatically from other parts of the Corresponding
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+same work.
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+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
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+  No covered work shall be deemed part of an effective technological
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+similar laws prohibiting or restricting circumvention of such
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+  When you convey a covered work, you waive any legal power to forbid
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+  4. Conveying Verbatim Copies.
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+  5. Conveying Modified Source Versions.
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+  You may convey a work based on the Program, or the modifications to
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+  You may convey a covered work in object code form under the terms
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+
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+  A "User Product" is either (1) a "consumer product", which means any
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+  If you convey an object code work under this section in, or with, or
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+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
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+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
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+
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+  All other non-permissive additional terms are considered "further
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+a further restriction but permits relicensing or conveying under this
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+not survive such relicensing or conveying.
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
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+holder fails to notify you of the violation by some reasonable means
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+
+  Moreover, your license from a particular copyright holder is
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
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+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
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+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+work and works based on it.
+
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+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+excuse you from the conditions of this License.  If you cannot convey a
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
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+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
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+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
-If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
 
-     bookhoard  Copyright (C) 2026  john-okeefe
-     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-     This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
-
-You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <https://www.gnu.org/licenses/>.
-
-The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <https://www.gnu.org/philosophy/why-not-lgpl.html>.
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,10 +1,10 @@
-# 📚 Bookhoard
+# <img src="web/static/favicon.svg" width="32" alt="Bookhoard logo"> Bookhoard
 
 A modern self-hosted media library system built with Go, PostgreSQL, HTMX, and Tailwind CSS featuring **universal cross-device sync**, beautiful dark themes, and comprehensive media management.
 
 ## ✨ Why Bookhoard?
 
-**🔄 Universal Sync**: Your reading progress, highlights, and notes sync automatically across all your devices - KOReader, Kobo, web, and mobile.
+**🔄 Universal Sync**: Your reading position, bookmarks, highlights, and notes sync automatically between KOReader and the web - with native Kobo sync and mobile apps coming later.
 
 **📱 Multi-Library**: Organize your ebooks, comics, and manga with per-library folders and smart collections.
 
@@ -52,13 +52,13 @@ The first user to register automatically becomes an admin.
 
 ### Universal Cross-Platform Sync
 
-- **Real-Time Progress**: Turn a page on your Kindle, see it on your phone
+- **Real-Time Progress**: Turn a page on your e-reader, see it in your browser
 - **Format-Aware**: EPUB CFI, page numbers, percentages - all handled correctly
 - **Offline Queue**: Changes sync when you reconnect, priority-processed
 - **Conflict Resolution**: Smart handling when same book read on multiple devices
 - **Book Matching**: Automatic matching using SHA-256, ISBN, UUID
 - **OPDS Catalog**: Wireless book delivery to e-readers over Wi-Fi
-- **Format Conversion**: On-the-fly EPUB→KEPUB for Kobo devices
+- **Format Conversion**: On-the-fly EPUB→KEPUB conversion (for upcoming native Kobo support)
 
 ### Media Management
 
@@ -74,7 +74,7 @@ The first user to register automatically becomes an admin.
 ### Smart Collections
 
 - **Auto-Assign Rules**: Automatically add books based on genre, author, series, tags, language, publisher, year
-- **Device Shelf Mappings**: Sync collections to Kobo shelves and KOReader categories
+- **Device Shelf Mappings**: Map collections to device shelves (used by native Kobo sync, coming soon)
 - **Test Before Creating**: Preview which books match your rules
 
 ### Library Organization
@@ -102,8 +102,8 @@ The first user to register automatically becomes an admin.
 
 - **[docs/user/calibre-integration.md](docs/user/calibre-integration.md)** - Calibre library integration
 - **[docs/user/sync-guide.md](docs/user/sync-guide.md)** - Understanding and using universal sync
-- **[docs/user/devices/kobo-setup.md](docs/user/devices/kobo-setup.md)** - Kobo e-reader configuration
 - **[docs/user/devices/koreader-setup.md](docs/user/devices/koreader-setup.md)** - KOReader configuration
+- **[docs/user/devices/kobo-setup.md](docs/user/devices/kobo-setup.md)** - Kobo e-reader configuration (coming soon)
 - **[docs/user/user-guide.md](docs/user/user-guide.md)** - General user guide
 - **[docs/user/admin-guide.md](docs/user/admin-guide.md)** - Admin features and configuration
 - **[docs/user/settings-guide.md](docs/user/settings-guide.md)** - Settings and preferences
@@ -111,18 +111,19 @@ The first user to register automatically becomes an admin.
 ### For Developers
 
 - **[docs/developer/api/api-reference.md](docs/developer/api/api-reference.md)** - Complete API documentation
-- **[docs/contributing/DEVELOPMENT.md](docs/contributing/DEVELOPMENT.md)** - Development workflow
+- **[docs/developer/android-app.md](docs/developer/android-app.md)** - Android app design & roadmap
+- **[docs/contributing/development.md](docs/contributing/development.md)** - Development workflow
 
 ---
 
 ## 🎯 Supported Devices
 
-| Platform         | Sync | OPDS | Status                   |
-| ---------------- | ---- | ---- | ------------------------ |
-| **Web Browser**  | ✅   | ✅   | Full support             |
-| **KOReader**     | ✅   | ✅   | Kindle, Kobo, PocketBook |
-| **Kobo Devices** | ✅   | ✅   | Clara, Libra, Sage, etc. |
-| **Mobile Apps**  | 🚧   | 🚧   | Coming Q2 2026           |
+| Platform         | Sync | OPDS | Status                                                        |
+| ---------------- | ---- | ---- | ------------------------------------------------------------- |
+| **Web Browser**  | ✅   | ✅   | Full support                                                  |
+| **KOReader**     | ✅   | ✅   | Runs on Kindle, Kobo, PocketBook hardware                     |
+| **Kobo Devices** | 🚧   | 🚧   | Native Kobo sync coming soon (use KOReader on Kobo today)     |
+| **Mobile Apps**  | 🚧   | 🚧   | Native Android app in design ([docs](docs/developer/android-app.md)); iOS later |
 
 ---
 
@@ -155,20 +156,20 @@ bruno run
 ## 📊 Project Status
 
 **Version**: 1.0  
-**License**: GPL-3.0  
+**License**: AGPL-3.0  
 **Status**: Production-ready ✅
 
 ---
 
 ## 🤝 Contributing
 
-We welcome contributions! Please see [docs/DEVELOPMENT.md](docs/DEVELOPMENT.md) for guidelines.
+We welcome contributions! Please see [docs/developer/development.md](docs/developer/development.md) for guidelines.
 
 ---
 
 ## 📄 License
 
-GPL-3.0 - See [LICENSE](LICENSE) file for details.
+AGPL-3.0 - See [LICENSE](LICENSE) file for details.
 
 ---
 

database/schema/schema.sql

@@ -335,8 +335,8 @@ CREATE TABLE IF NOT EXISTS media_highlights (
     media_item_id UUID NOT NULL REFERENCES media_items(id) ON DELETE CASCADE,
     user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     selection_text TEXT NOT NULL,
-    start_position VARCHAR(100), -- position (page:offset or CFI) where highlight starts
-    end_position VARCHAR(100),   -- position (page:offset or CFI) where highlight ends
+    start_position TEXT, -- position (page:offset, CFI, or locator JSON) where highlight starts
+    end_position TEXT,   -- position (page:offset, CFI, or locator JSON) where highlight ends
     color VARCHAR(7) DEFAULT '#ffff00', -- hex color code for highlight
     note_id UUID REFERENCES media_notes(id) ON DELETE SET NULL, -- optional associated note
     created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
@@ -1364,6 +1364,13 @@ ALTER TABLE media_highlights ADD COLUMN IF NOT EXISTS note_text TEXT;
 ALTER TABLE media_highlights ADD COLUMN IF NOT EXISTS deleted BOOLEAN DEFAULT FALSE;
 ALTER TABLE media_highlights ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
 
+-- Widen position columns for existing databases: the API handlers
+-- validate up to 1000 characters (full Readium locators, KOReader CRE
+-- xpointers) but VARCHAR(100) rejected anything longer at the database
+-- layer. VARCHAR -> TEXT is a metadata-only change, safe to re-run.
+ALTER TABLE media_highlights ALTER COLUMN start_position TYPE TEXT;
+ALTER TABLE media_highlights ALTER COLUMN end_position TYPE TEXT;
+
 ALTER TABLE media_notes ADD COLUMN IF NOT EXISTS dedup_key VARCHAR(40);
 ALTER TABLE media_notes ADD COLUMN IF NOT EXISTS last_modified_at TIMESTAMPTZ;
 ALTER TABLE media_notes ADD COLUMN IF NOT EXISTS last_modified_source VARCHAR(30);

docs/developer/android-app.md

@@ -0,0 +1,165 @@
+# Android App — Design & Roadmap
+
+This document describes the planned native Android client for Bookhoard: a thin, offline-first reading app that treats the Bookhoard server as its backend. The relationship is the same as the audiobookshelf app to an audiobookshelf server, or the Kindle app to Kindle cloud — the server owns the library, sync, and conflict resolution; the app is a dedicated, mobile-first reading frontend with its own UI, designed independently of the web interface.
+
+**Status**: Planning / pre-development
+**Companion repo**: `bookhoard-app` (separate repository, AGPL-3.0)
+
+---
+
+## 🎯 Product Vision
+
+- An **amazing ereader** first and foremost — rendering polish, latency, and reading UX are the product
+- **Mobile-first UI** designed from scratch for phones; not a wrapper around the web app
+- **Thin client**: the server remains authoritative for all sync, book matching, and conflict resolution
+- **v1 formats**: EPUB (ebooks) and CBZ (comics/manga); PDF comes nearly free via the reader toolkit
+- **Android first**. iOS is a real roadmap item but unscheduled — likely contributor-driven
+
+---
+
+## 🛠 Tech Stack
+
+| Concern        | Choice                                            |
+| -------------- | ------------------------------------------------- |
+| Language       | Kotlin                                            |
+| UI             | Jetpack Compose + Material 3                      |
+| Reader engine  | [Readium Kotlin toolkit](https://github.com/readium/kotlin-toolkit) |
+| Local database | Room                                              |
+| Networking     | OkHttp / Retrofit + WebSocket                     |
+| Background     | WorkManager                                       |
+| Images         | Coil                                              |
+| Settings       | DataStore                                         |
+
+### Why native Android
+
+- The quality bar is the Kindle app. Page-turn latency, text layout fidelity, PDF rendering (`PdfRenderer`), and comic/manga image pipelines are platform-level strengths — and they are the *hard* parts in a WebView, not the easy parts.
+- Android-first removes the "share one codebase across two platforms simultaneously" constraint that motivates hybrid stacks.
+- Solo, AI-assisted development compresses the cost of native (code volume), while native's failure modes (well-documented platform APIs) are far easier to debug — alone or with AI — than cross-framework bridge/plugin bugs.
+- The target audience is the self-hosted community, best reached via GitHub Releases and F-Droid rather than app-store optimization.
+
+### Alternatives considered
+
+- **Capacitor / WebView shell** (the audiobookshelf-app model): excellent when a self-contained SPA already exists; a poor fit here. Bookhoard's web UI is server-rendered HTMX and cannot be packaged, comics rendering in a WebView caps the polish target, and deep offline support fights the shell.
+- **Flutter**: strong middle ground, but no Readium port and a weaker EPUB/PDF plugin ecosystem than the native toolkits.
+- **Kotlin Multiplatform**: only pays off with a committed near-term iOS effort. Revisit if iOS becomes active; until then it would constrain v1 for a hypothetical.
+
+---
+
+## 🏗 Architecture
+
+Thin, offline-first client. The server API is the contract (see [API Reference](api/api-reference.md) and [WebSocket API](websocket-api.md)).
+
+### Module layout
+
+```
+:app               Compose UI, navigation, dependency injection
+:core:domain       Pure Kotlin — models, sync logic, use cases (no Android deps)
+:core:data         Room, Retrofit/OkHttp, downloads and file storage
+:feature:reader    Readium navigator integration and reading UI
+```
+
+Keeping `:core:domain` free of Android dependencies preserves optionality: a future iOS client, a KMP extraction, or a desktop client can reuse or port the domain logic without touching the UI.
+
+### Offline-first sync flow
+
+1. UI writes go to the local Room mirror **first** (never blocked on network)
+2. A WorkManager queue replays changes to the existing REST endpoints (`/api/progress`, `/api/media-items/:id/notes`, `/highlights`, etc.)
+3. Conflicts are resolved by the server's existing mechanisms — the client never invents its own merge logic
+4. While online, a WebSocket connection receives realtime updates pushed by other devices (web reader, KOReader)
+5. Books are downloaded to app storage for fully offline reading, with storage management UI
+
+### Authentication & device identity
+
+- **Primary auth: username/password login** via the existing endpoints (`POST /api/auth/login` + refresh). The app is a full user client — browse, collections, ratings, and annotation management all live behind the user JWT, which device tokens cannot reach
+- After login, the app registers itself as a **device** (`device_type: mobile`) and **self-approves** its registration using its own JWT — approval only requires a logged-in user. The phone then appears on the Devices page with sync attribution, per-device settings, and individually revocable access, with no QR ceremony
+- Netflix-style QR pairing as a zero-typing sign-in option: post-v1 (see below)
+
+---
+
+## 📖 Reader Engine
+
+[Readium](https://github.com/readium/kotlin-toolkit) provides EPUB, PDF, and CBZ through one publication model and navigator — production-hardened by real reading apps. This avoids building and maintaining three renderers.
+
+Planned reading features:
+
+- Custom fonts (including user-loaded), adjustable margins and line height
+- Themes including OLED true-black for battery
+- Paginated and scroll modes; gesture and volume-key page turns
+- Keep-screen-awake while reading
+- Highlights, notes, and bookmarks synced via existing APIs (including deleted-annotation restore)
+- Resume to exact position using EPUB CFI, consistent with universal sync
+
+### Comics & manga UX
+
+- RTL reading direction and double-page spreads with correct cover/single-page handling
+- Per-book reading-mode overrides (a manga library can default to RTL)
+- Zoom and pan; aggressive preloading of adjacent pages
+- Webtoon / continuous vertical mode: post-v1
+
+### Reader settings parity with the web reader
+
+The web reader (`web/src/reader/`) is the reference implementation for reading ergonomics — its font selection, reading themes, and highlight system are considered well-designed; only its desktop-oriented presentation is being replaced on mobile. The Android reader should reuse the same settings model (stored in the `reader_settings` table and synced via the settings endpoint) rather than inventing a parallel one:
+
+- **Fonts**: the same roster of variable fonts, self-hosted under `/static/fonts/` — Literata (default), Crimson Pro, Source Serif 4, EB Garamond, Libertinus Serif, Noto Serif, Charis SIL, IBM Plex Serif (`FONT_MAP` in `web/src/reader/reader.ts`)
+- **Typography**: `font_size` (default 18), `line_height` (1.6), `margin_width`, `double_page_spread`
+- **Themes**: `chrome_theme` (default `tokyo-night`) for app chrome vs `reading_theme`/`reading_mode` for the page surface, plus the fx stack (`fx_brightness`, `fx_contrast`, `fx_invert`)
+- **Navigation**: `tap_zones_enabled` + `tap_zone_size`, `reading_direction`, `progress_mode`
+- **Highlights**: per-annotation color (default `#ffd54f`), matching the web palette
+
+Settings chosen on one device should follow the user everywhere — mobile changes write back through the same sync.
+
+---
+
+## 🍎 iOS Posture
+
+iOS is a real roadmap item but not near-term. The strategy is **not** to pre-pay for it with KMP or a cross-platform framework. Instead:
+
+- The documented REST/WebSocket API is the sharing mechanism — a future iOS client is a *new client over the same contract*, never a rewrite of shared logic
+- A contributor-driven Swift/SwiftUI client is welcome; the server needs no changes to support it
+
+---
+
+## 📦 Distribution & Licensing
+
+- **License**: AGPL-3.0, matching the Bookhoard server
+- **Channels**: GitHub Releases and F-Droid; Play Store optional later
+
+---
+
+## 🚧 Milestones
+
+1. **Scaffold** — app shell, auth + QR device pairing, library browsing, book downloads
+2. **EPUB reading** — Readium integration, CFI progress sync, offline-first reading
+3. **Annotations** — highlights/notes/bookmarks sync with offline queue
+4. **Comics** — CBZ navigator with manga modes (RTL, spreads, zoom)
+5. **Polish** — OLED themes, gestures, background sync, storage management
+
+---
+
+## 🔭 Post-v1 Ideas
+
+### QR pairing sign-in (Netflix-style)
+
+"Add device" on the web (while logged in) displays a QR code; a fresh app install scans it and is **fully signed in** — no server URL, no password, nothing typed on the phone.
+
+- **QR is a full login**: the claim endpoint returns JWT + refresh token (plus the device token for sync identity)
+- **Typed-code fallback** (GitHub/Netflix device-flow style: app displays a short code, user enters it on the web) for phones with broken cameras or no camera
+- **KOReader keeps its existing flow unchanged** — no typed-code pairing there; it is already as convenient as it can be
+- **Use the configured `BASE_URL`, never a detected LAN IP** — if the server is published at `https://public.domain`, pairing must work identically from outside the LAN
+- Requires small server additions: `pair`/`claim` endpoints backed by single-use pairing sessions with a short TTL (in-memory like `pendingRegistrations`)
+
+### Other ideas
+
+- Webtoon / continuous vertical reading mode
+- Home-screen widgets and app shortcuts ("continue reading")
+- Text-to-speech
+- OPDS feed consumption from other servers
+
+---
+
+## Related Documentation
+
+- **[API Reference](api/api-reference.md)** - Complete REST API
+- **[WebSocket API](websocket-api.md)** - Real-time sync events
+- **[Sync Guide](../user/sync-guide.md)** - How universal sync works
+- **[Devices API](api/devices/)** - Device registration and approval

docs/developer/api-reference.md

@@ -26,14 +26,16 @@ Complete API documentation for Bookhoard v1.0 with Universal Cross-Platform Sync
 8. [Device Management](#device-management)
 9. [Analytics](#analytics)
 10. [Book Matching & Linking](#book-matching--linking)
-11. [Collections](#collections) → See [COLLECTIONS_API.md](COLLECTIONS_API.md)
+11. [Collections](#collections) → See [Collections API](collections-api.md)
 12. [OPDS](#opds-open-publication-distribution-system)
 13. [Sync Protocol - KOReader](#sync-protocol---koreader)
 14. [Sync Protocol - Kobo](#sync-protocol---kobo)
 15. [Universal Progress](#universal-progress)
 16. [Conflicts](#conflicts)
 17. [Sync Queue](#sync-queue)
-18. [WebSocket](#websocket)
+18. [System Settings & Configuration](#system-settings--configuration)
+19. [Hash Conflicts](#hash-conflicts)
+20. [WebSocket](#websocket)
 
 ## Base URL
 
@@ -201,7 +203,9 @@ Content-Type: application/json
 }
 ```
 
-### Update Scan Settings
+### Update Scan Settings (Legacy)
+
+> Superseded by `PUT /api/system/settings` (see [System Settings & Configuration](#system-settings--configuration)); kept for backward compatibility.
 
 ```http
 PUT /api/libraries/scan-settings
@@ -665,18 +669,23 @@ Content-Type: application/json
 
 ```json
 {
-  "device_id": "uuid",
   "registration_id": "registration-uuid",
-  "auth_url": "https://bookhoard.com/devices/auth/confirm/abc123",
+  "auth_url": "https://bookhoard.com/devices/approve/abc123",
   "qr_code": "data:image/png;base64,iVBORw0KG...",
-  "expires_in": 300
+  "expires_in": 300,
+  "poll_interval": 3,
+  "setup_instructions": {
+    "koreader": "Calibre URL: https://bookhoard.com/api/sync/koreader"
+  }
 }
 ```
 
+Open `auth_url` (or scan the QR code) while logged in to approve; the registration expires after 5 minutes.
+
 ### Check Registration Status
 
 ```http
-POST /api/devices/auth/status
+POST /api/devices/register/status
 Content-Type: application/json
 
 {
@@ -688,13 +697,13 @@ Content-Type: application/json
 
 ```json
 {
-  "status": "pending|approved|expired",
+  "status": "pending|approved",
   "auth_token": "device-bearer-token...",
   "device_id": "uuid",
   "sync_endpoints": {
-    "progress": "https://bookhoard.com/api/sync/progress",
-    "metadata": "https://bookhoard.com/api/sync/metadata",
-    "annotations": "https://bookhoard.com/api/sync/annotations"
+    "progress": "https://bookhoard.com/api/sync/koreader/progress",
+    "metadata": "https://bookhoard.com/api/sync/koreader/metadata",
+    "bookmarks": "https://bookhoard.com/api/sync/koreader/bookmarks"
   }
 }
 ```
@@ -747,6 +756,22 @@ DELETE /api/devices/{device_id}
 Authorization: Bearer <token>
 ```
 
+### Get Device Sidecar Config
+
+Returns the `.bookhoard.json` sidecar config for a device (server endpoints, books keyed by per-format SHA-256, collections) used by the KOReader plugin to self-configure.
+
+```http
+GET /api/devices/{device_id}/sidecar
+Authorization: Bearer <token>
+```
+
+Also available as a file download:
+
+```http
+GET /api/devices/{device_id}/sidecar/download
+Authorization: Bearer <token>
+```
+
 ## Analytics
 
 ### Get Reading Statistics
@@ -953,7 +978,7 @@ Authorization: Bearer <token>
 
 ## Collections
 
-For complete collection management documentation, see **[COLLECTIONS_API.md](COLLECTIONS_API.md)**.
+For complete collection management documentation, see **[Collections API](collections-api.md)**.
 
 **Quick Reference**:
 
@@ -1203,6 +1228,8 @@ Authorization: Bearer <device_token>
 
 ## Sync Protocol - Kobo
 
+> **Status: Coming Soon** — Native Kobo sync is implemented server-side but not yet supported on real devices. These endpoints are under active development and may change.
+
 ### Kobo Markup Sync
 
 ```http
@@ -1538,6 +1565,96 @@ Authorization: Bearer <token>
 }
 ```
 
+## System Settings & Configuration
+
+### List All Settings
+
+Returns every tunable setting with current value and metadata (type, range, category, group, description, `requires_restart`, `is_default`).
+
+```http
+GET /api/system/settings
+Authorization: Bearer <admin_token>
+```
+
+**Response** (200):
+
+```json
+[
+  {
+    "key": "scan_poll_interval_seconds",
+    "value": "60",
+    "type": "int",
+    "min": "1",
+    "max": "3600",
+    "requires_restart": false,
+    "category": "scanner",
+    "group": "Scanning",
+    "description": "How often to scan all libraries (seconds)",
+    "is_default": true
+  }
+]
+```
+
+### Update a Setting
+
+Type-aware validation (int range, bool parse, IANA timezone for `default_timezone`), persists the value, reloads the registry, and reports whether a restart is needed.
+
+```http
+PUT /api/system/settings
+Authorization: Bearer <admin_token>
+Content-Type: application/json
+
+{
+  "key": "scan_poll_interval_seconds",
+  "value": "30"
+}
+```
+
+**Response** (200): the updated entry plus `reload_required`.
+
+Setting categories: scanner (`scan_poll_interval_seconds`, `auto_scan_enabled`), general (`default_timezone`), security (session duration, password rules, auth rate limit, login lockout), api (OPDS page sizes, device rate limits), sync (annotation tombstone TTL, sync queue interval/batch), performance (conversion cache TTL, worker pool size/capacity). See [System Settings API](api/system/settings.md) for the full catalog.
+
+### Get / Update Raw System Config
+
+Flat key/value configuration (e.g. `base_url`), including keys without registry metadata.
+
+```http
+GET /api/system/config
+PUT /api/system/config
+Authorization: Bearer <admin_token>
+```
+
+## Hash Conflicts
+
+Duplicate content discovered during hashing (import, rescan, or the startup backfill) is grouped into hash conflicts for an explicit keep/merge decision. Files on disk are never deleted.
+
+### List Hash Conflicts
+
+```http
+GET /api/admin/hash-conflicts
+Authorization: Bearer <admin_token>
+```
+
+**Response** (200): `{ "conflicts": [ { id, library_id, library_name, sha256, created_at, items: [ { id, title, author, file_path, file_size, created_at, progress_count, highlight_count, bookmark_count, note_count, collection_count } ] } ], "total": n }`
+
+### Resolve Hash Conflict
+
+```http
+POST /api/admin/hash-conflicts/:id/resolve
+Authorization: Bearer <admin_token>
+Content-Type: application/json
+
+{
+  "action": "keep",
+  "keep_uuid": "media-item-uuid-to-keep"
+}
+```
+
+- `action=keep` — merge every other copy's child rows (progress, highlights, bookmarks, notes, collections) into the kept item, then delete the losers
+- `action=keep_all` — copies are intentional; dismiss the conflict
+
+**Errors**: `400` (bad ID / missing `keep_uuid`), `404` (not found), `409` (already resolved).
+
 ## WebSocket
 
 ### Connect to WebSocket
@@ -1693,10 +1810,10 @@ bruno run bruno/devices/
 
 ## Additional Resources
 
-- [README.md](README.md) - Getting started guide
-- [UNIVERSAL_SYNC_IMPLEMENTATION_GUIDE.md](UNIVERSAL_SYNC_IMPLEMENTATION_GUIDE.md) - Sync architecture
-- [KOBOREADER_SETUP.md](KOBOREADER_SETUP.md) - KOReader device setup
-- [KOBO_SETUP.md](KOBO_SETUP.md) - Kobo device setup
+- [README.md](../../README.md) - Getting started guide
+- [Sync Guide](../user/sync-guide.md) - Sync concepts and conflict resolution
+- [KOReader Setup](../user/devices/koreader-setup.md) - KOReader device setup
+- [Kobo Setup](../user/devices/kobo-setup.md) - Kobo device setup (native sync coming soon)
 
 ---
 

docs/developer/api/admin/hash-conflicts.md

@@ -0,0 +1,111 @@
+# Hash Conflicts API
+
+## Overview
+
+When Bookhoard hashes your library (on import, rescan, or the startup backfill), two media items in the same library with the same `file_sha256` indicate duplicate content. Each duplicate group is recorded as a **hash conflict** and exposed here for an explicit keep/merge decision. Conflicts are also surfaced in the admin UI's Hash Conflicts page.
+
+**Authentication**: Admin JWT token required
+**Content-Type**: `application/json` (resolve also accepts form-encoded bodies for htmx)
+
+---
+
+## Endpoints
+
+### List Hash Conflicts
+
+List all pending conflict groups, each with its member items and per-item usage counts (reading progress, highlights, bookmarks, notes, collections) to help decide which copy to keep.
+
+**Endpoint**: `GET /api/admin/hash-conflicts`
+
+**Response**: **200 OK**
+
+```json
+{
+  "conflicts": [
+    {
+      "id": "conflict-uuid",
+      "library_id": "library-uuid",
+      "library_name": "Ebooks",
+      "sha256": "abc123...",
+      "created_at": "2026-08-14T12:00:00Z",
+      "items": [
+        {
+          "id": "media-item-uuid",
+          "title": "The Hobbit",
+          "author": "J. R. R. Tolkien",
+          "file_path": "/books/hobbit.epub",
+          "file_size": 1048576,
+          "created_at": "2026-01-01T00:00:00Z",
+          "progress_count": 2,
+          "highlight_count": 12,
+          "bookmark_count": 3,
+          "note_count": 1,
+          "collection_count": 2
+        }
+      ]
+    }
+  ],
+  "total": 1
+}
+```
+
+**Example**:
+
+```bash
+curl -X GET https://bookhoard.example.com/api/admin/hash-conflicts \
+  -H "Authorization: Bearer <admin_token>"
+```
+
+---
+
+### Resolve Hash Conflict
+
+Resolve one conflict group.
+
+**Endpoint**: `POST /api/admin/hash-conflicts/{id}/resolve`
+
+**Request Body** (JSON or form-encoded):
+
+```json
+{
+  "action": "keep",
+  "keep_uuid": "media-item-uuid-to-keep"
+}
+```
+
+| Field       | Type   | Required             | Description                                                                                                                     |
+| ----------- | ------ | -------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
+| `action`    | string | Yes                  | `keep_all` — both copies are intentional; dismiss the conflict. `keep` — keep `keep_uuid` and delete the other copies.          |
+| `keep_uuid` | string | for `action=keep`    | The media item UUID to keep. Must belong to this conflict group. With `keep`, every other copy's child rows (progress, highlights, bookmarks, notes, collections, …) are merged into the kept item before the losers are deleted. |
+
+**Responses**:
+
+- `200 OK` — resolved (body is an HTML confirmation snippet for the admin UI page)
+- `400 Bad Request` — invalid conflict ID, missing `keep_uuid`, or `keep_uuid` not in the group
+- `404 Not Found` — conflict doesn't exist
+- `409 Conflict` — conflict already resolved
+
+**Example**:
+
+```bash
+curl -X POST https://bookhoard.example.com/api/admin/hash-conflicts/<id>/resolve \
+  -H "Authorization: Bearer <admin_token>" \
+  -H "Content-Type: application/json" \
+  -d '{"action": "keep", "keep_uuid": "media-item-uuid"}'
+```
+
+---
+
+## When Conflicts Are Created
+
+- **Startup backfill**: items imported before hashing existed are hashed automatically ~30s after startup; duplicates discovered land here.
+- **Rescan**: hashes are recomputed and content duplicates are flagged.
+
+Files on disk are never deleted — resolution only affects database rows.
+
+---
+
+## Related Endpoints
+
+- [System Settings API](../system/settings.md) — scanning configuration
+- [Scanner API](../scanner/) — triggering scans and watch mode

docs/developer/api/api-reference.md

@@ -21,9 +21,10 @@ Complete reference for Bookhoard REST API endpoints.
 - [Conflicts](conflicts/) - Sync conflict resolution
 - [Queue](queue/) - Sync queue management
 - [Scanner](scanner/) - Library scanning and watch mode (admin)
+- [System](system/) - Tunable system settings and configuration (admin)
 - [OPDS](opds/) - Open Publication Distribution
 - [KOReader](koreader/) - KOReader sync protocol
-- [Kobo](kobo/) - Kobo sync protocol
+- [Kobo](kobo/) - Kobo sync protocol (coming soon)
 - [WebSocket](websocket/) - Real-time sync events
 
 ---
@@ -51,6 +52,8 @@ See [Admin Operations](admin/)
 
 - GET /api/auth/users - List all users (admin)
 - PUT /api/auth/users/:id/max-devices - Update user device limit (admin)
+- GET /api/admin/hash-conflicts - List pending hash conflict groups (admin) — see [Hash Conflicts](admin/hash-conflicts.md)
+- POST /api/admin/hash-conflicts/:id/resolve - Resolve a conflict (keep / keep_all) (admin)
 
 ## Users & Profiles
 
@@ -71,7 +74,10 @@ See [Library Management](libraries/)
 - DELETE /api/libraries/:id/folders - Delete library folder (admin)
 - GET /api/libraries/:id/stats - Get library statistics (admin)
 - GET /api/libraries/:id/media-items - Get library media items (admin)
+- GET /api/libraries/browse - Browse server directories (admin)
 - POST /api/libraries/:id/scan - Scan library (admin)
+- GET /api/libraries/scan-settings - Legacy scan settings (admin; superseded by /api/system/settings)
+- PUT /api/libraries/scan-settings - Legacy scan settings update (admin; superseded by /api/system/settings)
 - GET /api/libraries/visibility - Get visible libraries
 - POST /api/libraries/visibility - Set library visibility
 
@@ -83,7 +89,7 @@ See [Media Item Operations](media-items/)
 - GET /api/media-items/:id - Get media item details
 - POST /api/media-items/bulk-delete - Bulk delete media items
 - POST /api/media-items/bulk-update - Bulk update media items (tags/contributors with normalization)
-- GET /api/media-items/:uuid/download - Download media item file
+- GET /uploads/library-{library_id}/{file_path} - Download book file / cover (JWT; see [Download Media Item](media-items/download_media_item.md))
 - POST /api/media-items/:id/rating - Create rating
 - GET /api/media-items/:id/rating - Get rating
 - PUT /api/media-items/:id/rating - Update rating
@@ -101,6 +107,10 @@ See [Media Item Operations](media-items/)
 - GET /api/media-items/:id/highlights/:highlightId - Get highlight
 - PUT /api/media-items/:id/highlights/:highlightId - Update highlight
 - DELETE /api/media-items/:id/highlights/:highlightId - Delete highlight
+- GET /api/media-items/:id/bookmarks - Get bookmarks
+- GET /api/media-items/:id/annotations/deleted - List deleted annotations (history)
+- POST /api/media-items/:id/annotations/:annotationId/restore - Restore a deleted annotation
+- DELETE /api/media-items/:id/annotations/:annotationId?annotation_type=highlight|note|bookmark - Permanently delete a deleted annotation
 - POST /api/media-items - Create media item (admin)
 - PUT /api/media-items/:id - Update media item (admin)
 - DELETE /api/media-items/:id - Delete media item (admin)
@@ -134,10 +144,21 @@ See [Device Registration & Sync](devices/)
 - GET /api/devices/pending - List pending registrations (admin)
 - GET /api/devices/approve/:registration_id - Approve registration (admin)
 - POST /api/devices/reject/:registration_id - Reject registration (admin)
-- POST /api/devices/:id/shelves - Add to shelf (Kobo)
+- POST /api/devices/:id/shelves - Add to shelf (Kobo; used by native Kobo sync, coming soon)
 - GET /api/devices/:id/shelves - Get shelf contents
 - DELETE /api/devices/:id/shelves - Remove from shelf
 - DELETE /api/devices/:id/shelves/clear - Clear shelf
+- GET /api/devices/:id/sidecar - Get device sidecar config (.bookhoard.json) — see [Sidecar Config](devices/get_sidecar_config.md)
+- GET /api/devices/:id/sidecar/download - Download sidecar config as a file
+
+## System Settings & Configuration
+
+See [System API](system/)
+
+- GET /api/system/settings - List all tunable settings with metadata (admin)
+- PUT /api/system/settings - Validate, persist, and reload a single setting (admin)
+- GET /api/system/config - Raw key/value system configuration (admin)
+- PUT /api/system/config - Update raw config values (admin)
 
 ## Analytics
 
@@ -220,12 +241,15 @@ See [OPDS Feeds](opds/)
 See [KOReader Sync](koreader/) and [Sync Protocol](sync/koreader-protocol.md)
 
 - POST /api/sync/koreader/progress - Sync reading progress
+- GET /api/sync/koreader/resolve?sha256={hash} - Resolve a book UUID by file SHA-256
 - GET /api/sync/koreader/metadata/:uuid - Get book metadata
 - GET /api/sync/koreader/library - Get device library
 - POST /api/sync/koreader/bookmarks - Sync bookmarks
 
 ## Kobo Sync Protocol
 
+> **Status: Coming Soon** — Native Kobo sync is implemented server-side but not yet supported on real devices. These endpoints are under active development and may change.
+
 See [Kobo Sync](kobo/) and [Sync Protocol](sync/kobo-protocol.md)
 
 - POST /api/sync/kobo/markup - Sync markup highlights

docs/developer/api/authentication/login.md

@@ -26,7 +26,7 @@ Authenticate with email and password.
 
 ```json
 {
-  "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
+  "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
   "refresh_token": "d4f5g6h7...",
   "token_type": "Bearer",
   "expires_in": 604800,
@@ -41,6 +41,8 @@ Authenticate with email and password.
 }
 ```
 
+Note: the access token field is `access_token` (not `token`). Nullable profile fields (`first_name`, `last_name`) may be empty strings.
+
 **Set-Cookie Header**:
 
 ```

docs/developer/api/authentication/overview.md

@@ -158,7 +158,7 @@ The frontend toast.js interceptor:
 - **Backend**: Automatically manages HTTP-only cookie
 - **Frontend**: Store tokens in localStorage for API calls
 
-### Mobile Applications
+### Mobile Applications (coming later)
 
 - Store access token in secure storage (Keychain/Keystore)
 - Store refresh token in secure storage

docs/developer/api/devices/get_devices.md

@@ -2,7 +2,7 @@
 
 Check device registration status or get device details.
 
-**Endpoint**: `POST /api/devices/auth/status` or `GET /api/devices/{device_id}`
+**Endpoint**: `POST /api/devices/register/status` or `GET /api/devices/{device_id}`
 **Auth**: Not required for status check, Required for device details
 **Content-Type**: `application/json` (for status check)
 
@@ -24,7 +24,9 @@ Check device registration status or get device details.
 
 ```json
 {
-  "status": "pending|approved|expired",
+  "status": "pending|approved",
+  "message": "awaiting user approval",
+  "expires_in": 123,
   "auth_token": "device-bearer-token...",
   "device_id": "uuid",
   "sync_endpoints": {
@@ -35,24 +37,16 @@ Check device registration status or get device details.
 }
 ```
 
-## Response (200 OK) - Device Details
+`status` is `pending` or `approved`. While pending, the response includes `message` and `expires_in` (seconds remaining). Once approved, the response includes `auth_token`, `device_id`, and `sync_endpoints`; `auth_token` fields are empty when pending.
 
-```json
-{
-  "id": "uuid",
-  "device_name": "My Kobo Clara",
-  "device_type": "kobo",
-  "last_sync": "2026-01-31T10:00:00Z",
-  "last_seen": "2026-01-31T10:05:00Z",
-  "sync_enabled": true,
-  "auto_sync": true,
-  "sync_frequency_minutes": 5
-}
-```
+**The approved response is single-use**: the registration is deleted from the pending map once returned, so store the `auth_token` immediately. A repeat status check for the same `registration_id` returns 404.
 
 ## Error Responses
 
-| Code | Description                                   |
-| ---- | --------------------------------------------- |
-| 401  | Invalid or expired token (for device details) |
-| 404  | Device or registration not found              |
+| Code | Description                                        |
+| ---- | -------------------------------------------------- |
+| 400  | Invalid or missing `registration_id`               |
+| 404  | Registration not found (unknown or already issued) |
+| 410  | Registration expired (`{"error": "registration expired"}`) |
+
+Note: expiration is signaled by HTTP 410 Gone, not a `"status": "expired"` value. Pending registrations are held in server memory, so a server restart also invalidates them (subsequent checks return 404).

docs/developer/api/devices/get_sidecar_config.md

@@ -0,0 +1,68 @@
+# Get Device Sidecar Config
+
+Returns the KOReader/Kobo sidecar configuration (`.bookhoard.json`) for a device: server endpoints, the user's books (keyed by SHA-256 with UUID fallback), and collections. Used by the Bookhoard KOReader plugin to self-configure after approval.
+
+**Endpoint**: `GET /api/devices/{id}/sidecar`
+**Auth**: User JWT (device owner or admin)
+
+### Response (200 OK)
+
+```json
+{
+  "version": "1",
+  "bookhoard": {
+    "opds_catalog": "https://bookhoard.example.com/opds/devices/<device-id>/catalog",
+    "sync_api": "https://bookhoard.example.com/api/sync/kobo",
+    "opds_base_url": "https://bookhoard.example.com/opds",
+    "api_base_url": "https://bookhoard.example.com",
+    "device_id": "<device-id>",
+    "device_token": "dev_..."
+  },
+  "books": {
+    "abc123sha256...": {
+      "bookhoard_uuid": "media-item-uuid",
+      "title": "The Hobbit",
+      "author": "J. R. R. Tolkien",
+      "available_formats": ["epub", "kepub"],
+      "sha256": "abc123sha256...",
+      "file_path": "/books/hobbit.epub"
+    }
+  },
+  "collections": [
+    { "name": "Favorites", "shelf_mapping": "Favorites" }
+  ],
+  "opds_enabled": true,
+  "sidecar_enabled": true,
+  "last_updated": "2026-08-20T12:00:00Z"
+}
+```
+
+**Notes**:
+
+- The `books` map is keyed by per-format SHA-256 (falling back to the item UUID), so a book downloaded in a different format (e.g. KEPUB) still matches its primary entry. Each entry lists `available_formats` for the item.
+- `available_formats` includes `kepub` when the source is an EPUB (conversion available).
+
+### Example Request
+
+```bash
+curl https://bookhoard.example.com/api/devices/<device-id>/sidecar \
+  -H "Authorization: Bearer <token>"
+```
+
+---
+
+# Download Device Sidecar Config
+
+Generates the same configuration as a downloadable `.bookhoard.json` file for manual device setup.
+
+**Endpoint**: `GET /api/devices/{id}/sidecar/download`
+**Auth**: User JWT (device owner or admin)
+
+### Response (200 OK)
+
+**Headers**:
+
+- `Content-Type`: `application/json`
+- `Content-Disposition`: attachment; filename="<device-name>.bookhoard.json"
+
+**Body**: the sidecar JSON (same shape as above).

docs/developer/api/devices/register_device.md

@@ -28,14 +28,19 @@ Register a new device for sync.
 
 ```json
 {
-  "device_id": "uuid",
   "registration_id": "registration-uuid",
-  "auth_url": "https://bookhoard.com/devices/auth/confirm/abc123",
+  "auth_url": "https://bookhoard.com/devices/approve/abc123",
   "qr_code": "data:image/png;base64,iVBORw0KG...",
-  "expires_in": 300
+  "expires_in": 300,
+  "poll_interval": 3,
+  "setup_instructions": {
+    "koreader": "Calibre URL: https://bookhoard.com/api/sync/koreader"
+  }
 }
 ```
 
+Open `auth_url` (or scan the QR code) while logged in to approve; the registration expires after 5 minutes. Poll `POST /api/devices/register/status` at `poll_interval` seconds until `status` is `approved`, at which point the response includes the device's `auth_token`, `device_id`, and `sync_endpoints`.
+
 ## Error Responses
 
 | Code | Description               |

docs/developer/api/kobo/analytics_gettests.md

@@ -1,5 +1,7 @@
 # Analytics GetTests
 
+> **Status: Coming Soon** — Native Kobo sync is not yet supported on real devices; this endpoint is under active development and may change.
+
 Kobo analytics endpoint (device compatibility).
 
 **Endpoint**: `POST /api/sync/kobo/v1/analytics/gettests`

docs/developer/api/kobo/bookmark_sync.md

@@ -1,5 +1,7 @@
 # Bookmark Sync
 
+> **Status: Coming Soon** — Native Kobo sync is not yet supported on real devices; this endpoint is under active development and may change.
+
 Sync bookmarks from Kobo device.
 
 **Endpoint**: `POST /api/sync/kobo/bookmark`

docs/developer/api/kobo/initialization.md

@@ -1,5 +1,7 @@
 # Kobo Initialization
 
+> **Status: Coming Soon** — Native Kobo sync is not yet supported on real devices; this endpoint is under active development and may change.
+
 Initialize Kobo device sync.
 
 **Endpoint**: `GET /api/sync/kobo/v1/initialization`

docs/developer/api/kobo/markup_sync.md

@@ -1,5 +1,7 @@
 # Markup Sync
 
+> **Status: Coming Soon** — Native Kobo sync is not yet supported on real devices; this endpoint is under active development and may change.
+
 Sync markup highlights and annotations from Kobo device.
 
 **Endpoint**: `POST /api/sync/kobo/markup`

docs/developer/api/kobo/sync_from_server.md

@@ -1,5 +1,7 @@
 # Sync From Server
 
+> **Status: Coming Soon** — Native Kobo sync is not yet supported on real devices; this endpoint is under active development and may change.
+
 Push content and metadata to Kobo device.
 
 **Endpoint**: `POST /api/sync/kobo/sync-from-server`

docs/developer/api/koreader/resolve_book.md

@@ -0,0 +1,50 @@
+# Resolve Book
+
+Map a book's file SHA-256 to its Bookhoard UUID without touching progress
+state. Used by devices to link a freshly downloaded book before their first
+pull, so the device's first-page position is never pushed (which would
+conflict with server-side progress for books already mid-read).
+
+**Endpoint**: `GET /api/sync/koreader/resolve`
+**Auth**: Required (Device authentication)
+
+## Query Parameters
+
+| Parameter | Type   | Required | Description                          |
+| --------- | ------ | -------- | ------------------------------------ |
+| sha256    | string | Yes      | File content hash (64 hex characters) |
+
+Resolution is format-aware: the hash is checked against both
+`media_items.file_sha256` and `media_item_formats.file_sha256`, so a
+converted file (KEPUB/PDF) matches its media item too.
+
+## Device Authentication
+
+This endpoint requires device authentication (not user JWT). Devices
+authenticate using their device credentials.
+
+### Example Request
+
+```http
+GET /api/sync/koreader/resolve?sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+Authorization: Bearer {device_token}
+```
+
+## Response (200 OK)
+
+```json
+{
+  "book_uuid": "550e8400-e29b-41d4-a716-446655440000",
+  "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+  "title": "Book Title",
+  "author": "Author Name"
+}
+```
+
+## Error Responses
+
+| Code | Description                                  |
+| ---- | -------------------------------------------- |
+| 400  | Missing or malformed `sha256` parameter      |
+| 401  | Device authentication failed                 |
+| 404  | No book in the library matches the given hash |

docs/developer/api/koreader/sync_bookmarks.md

@@ -1,49 +1,81 @@
 # Sync Bookmarks
 
-Sync bookmarks from KOReader device.
+Sync bookmarks, notes, and highlights from a KOReader device (bidirectional — the response also returns the server's current state for the book so the device can reconcile).
 
 **Endpoint**: `POST /api/sync/koreader/bookmarks`
-**Auth**: Required (Device authentication)
-
-## Device Authentication
-
-This endpoint requires device authentication (not user JWT). Devices authenticate using their device credentials.
+**Auth**: Device token (Bearer)
 
 ## Request Body
 
-| Field     | Type          | Required | Description               |
-| --------- | ------------- | -------- | ------------------------- |
-| device_id | string (UUID) | Yes      | Device UUID               |
-| bookmarks | array         | Yes      | Array of bookmark objects |
+| Field        | Type   | Required              | Description                                                       |
+| ------------ | ------ | --------------------- | ----------------------------------------------------------------- |
+| book_uuid    | string | one of uuid/sha       | Book UUID (highest-confidence match)                              |
+| book_sha256  | string | one of uuid/sha       | Full-file SHA-256 (64 hex chars); format-aware (also matches `media_item_formats`, so a KEPUB/PDF download matches) |
+| bookmarks    | array  | No                    | Bookmark objects                                                  |
+| notes        | array  | No                    | Note objects                                                      |
+| highlights   | array  | No                    | Highlight objects                                                 |
 
-### Bookmark Object
+At least one of `book_uuid` or `book_sha256` is required; `book_sha256` resolves through the shared BookResolver.
 
-| Field            | Type    | Required | Description                |
-| ---------------- | ------- | -------- | -------------------------- |
-| book             | string  | Yes      | Book identifier            |
-| chapter          | string  | No       | Chapter title              |
-| page             | integer | No       | Page number                |
-| position         | float   | Yes      | Position in document (0-1) |
-| notes            | string  | No       | Bookmark notes             |
-| highlighted_text | string  | No       | Highlighted text           |
-| time             | string  | Yes      | ISO 8601 timestamp         |
-| created_at       | string  | Yes      | ISO 8601 timestamp         |
+### Bookmark / Note / Highlight Object
+
+All three types share the same KOReader annotation shape:
+
+| Field        | Type    | Required | Description                                          |
+| ------------ | ------- | -------- | ---------------------------------------------------- |
+| chapter      | int     | No       | Chapter index                                        |
+| datetime     | string  | No       | ISO 8601 creation/edit timestamp                     |
+| pos0 / pos1  | string  | No       | Start/end xpointer (or `page:N` / bare page)         |
+| page         | int     | No       | Page number (fallback location when `pos0` is empty) |
+| text         | string  | No       | Highlighted text                                     |
+| notes        | string  | No       | Note text attached to the annotation                 |
+| type         | string  | No       | Annotation type (`highlight`, `note`, `bookmark`)    |
+| color        | string  | No       | Highlight color (highlights only) — KOReader palette name, see below |
+| percentage   | float   | No       | Position within the book (0-1)                       |
+| book_sha256  | string  | No       | Per-annotation SHA-256; overrides the request-level book match |
+| dedup_key    | string  | No       | Stable echo key; an entry whose content is unchanged from what the server previously served is recognized as an echo rather than a new edit |
+
+### Color Semantics
+
+KOReader paints highlights from a fixed palette of color names; the web reader uses hex swatches. Colors are mapped at the boundary (unmappable values fall back to yellow on both sides):
+
+| KOReader name | Web hex   |
+| ------------- | --------- |
+| yellow, orange | `#ffd54f` |
+| green, olive  | `#a5d6a7` |
+| cyan, blue    | `#90caf9` |
+| purple        | `#ce93d8` |
+| red           | `#f48fb1` |
+
+- An echo (device re-reporting an annotation it received from the server) carries **no color**, so the stored web color is never clobbered.
+- A non-empty color means the user edited the highlight on the device; it is mapped to the nearest web swatch.
 
 ### Example Request
 
 ```json
 {
-  "device_id": "550e8400-e29b-41d4-a716-446655440000",
+  "book_sha256": "64-hex-char-sha256",
   "bookmarks": [
     {
-      "book": "book.epub",
-      "chapter": "Chapter 1",
+      "chapter": 3,
+      "datetime": "2026-08-20T10:00:00Z",
+      "pos0": "/body/Doc[4]/Sec[2]",
       "page": 25,
-      "position": 0.125,
-      "notes": "Important section",
-      "highlighted_text": "Text to remember",
-      "time": "2026-02-08T10:00:00Z",
-      "created_at": "2026-02-08T10:00:00Z"
+      "text": "",
+      "type": "bookmark",
+      "percentage": 0.125
+    }
+  ],
+  "highlights": [
+    {
+      "datetime": "2026-08-20T10:05:00Z",
+      "pos0": "/body/Doc[4]/Sec[2]/text()[3]:0",
+      "pos1": "/body/Doc[4]/Sec[2]/text()[3]:42",
+      "text": "Text to remember",
+      "notes": "Why this matters",
+      "type": "highlight",
+      "color": "blue",
+      "dedup_key": "echo-key-from-server"
     }
   ]
 }
@@ -53,15 +85,17 @@ This endpoint requires device authentication (not user JWT). Devices authenticat
 
 ```json
 {
-  "message": "Bookmarks synced successfully",
-  "synced_count": 1
+  "sync_status": "ok",
+  "bookmarks_synced": 1,
+  "notes_synced": 0,
+  "highlights_synced": 1
 }
 ```
 
 ## Error Responses
 
-| Code | Description                  |
-| ---- | ---------------------------- |
-| 401  | Device authentication failed |
-| 400  | Invalid request data         |
-| 404  | Device not found             |
+| Code | Description                                        |
+| ---- | -------------------------------------------------- |
+| 400  | Invalid request, or neither uuid nor SHA provided  |
+| 401  | Missing/invalid device token                       |
+| 404  | Book not found by SHA-256                          |

docs/developer/api/libraries/get_visible_libraries.md

@@ -2,7 +2,7 @@
 
 Retrieve all libraries visible to the current user.
 
-**Endpoint**: `GET /api/libraries/visible`
+**Endpoint**: `GET /api/libraries/visibility`
 **Auth**: Required
 
 ## Request Headers
@@ -14,26 +14,33 @@ Retrieve all libraries visible to the current user.
 ### Example Request
 
 ```http
-GET /api/libraries/visible
+GET /api/libraries/visibility
 Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
 ```
 
 ## Response (200 OK)
 
+A top-level JSON **array** of library rows:
+
 ```json
-{
-  "libraries": [
-    {
-      "id": "uuid",
-      "name": "My Ebooks",
-      "description": "Ebook collection",
-      "type_name": "ebooks",
-      "is_visible": true
-    }
-  ]
-}
+[
+  {
+    "id": "uuid",
+    "name": "My Ebooks",
+    "description": "Ebook collection",
+    "library_type_id": "uuid",
+    "created_by_admin_id": "uuid",
+    "created_at": "2026-01-31T10:00:00Z",
+    "updated_at": "2026-01-31T10:00:00Z",
+    "type_name": "ebooks",
+    "type_description": "Ebook libraries",
+    "is_visible": true
+  }
+]
 ```
 
+Nullable columns (`description`, `type_description`) serialize as `null` when unset. Timestamps are RFC 3339.
+
 ## Error Responses
 
 | Code | Description              |

docs/developer/api/media-items/deleted_annotations.md

@@ -0,0 +1,84 @@
+# Deleted Annotations History
+
+List, restore, or permanently delete tombstoned annotations (highlights,
+notes, bookmarks) for a book. Deletions — from the web or propagated from a
+synced device — are soft-deleted and retained for the sync retention window
+(default 30 days), powering the book page's "Recently deleted" list. A
+restore returns the row to the active set on every synced device; a purge
+removes it immediately and irreversibly.
+
+All endpoints require user JWT authentication and operate only on the
+caller's own annotations.
+
+## List Deleted Annotations
+
+**Endpoint**: `GET /api/media-items/:id/annotations/deleted`
+
+Returns tombstoned annotations for the book, newest deletion first.
+
+### Response (200 OK)
+
+```json
+{
+  "deleted_annotations": [
+    {
+      "id": "550e8400-e29b-41d4-a716-446655440000",
+      "annotation_type": "highlight",
+      "display_text": "the chosen text",
+      "secondary_text": "user note",
+      "color": "#ffd54f",
+      "deleted_at": "2026-08-22T15:04:05Z",
+      "created_at": "2026-08-01T10:00:00Z"
+    }
+  ],
+  "total": 1
+}
+```
+
+| Field           | Description                                            |
+| --------------- | ------------------------------------------------------ |
+| annotation_type | `highlight`, `note`, or `bookmark`                      |
+| display_text    | Highlighted text / note content / bookmark title       |
+| secondary_text  | Note text (highlights) or notes field (bookmarks)      |
+
+## Restore Deleted Annotation
+
+**Endpoint**: `POST /api/media-items/:id/annotations/:annotationId/restore`
+
+Body (or query param) `annotation_type` must be `highlight`, `note`, or
+`bookmark`. Clears the tombstone; the annotation reappears in the active
+set and re-syncs to devices on their next pull.
+
+```json
+{ "annotation_type": "highlight" }
+```
+
+### Response (200 OK)
+
+```json
+{ "restored": true }
+```
+
+404 when no matching *deleted* annotation exists for this user and book.
+
+## Permanently Delete Annotation
+
+**Endpoint**: `DELETE /api/media-items/:id/annotations/:annotationId?annotation_type=highlight|note|bookmark`
+
+Removes the tombstoned row from the history immediately. Irreversible —
+unlike the tombstone itself, which is restorable until the retention window
+lapses and the daily maintenance sweep purges it.
+
+### Response (200 OK)
+
+```json
+{ "purged": true }
+```
+
+## Error Responses
+
+| Code | Description                                        |
+| ---- | -------------------------------------------------- |
+| 400  | Invalid IDs or missing/unknown `annotation_type`   |
+| 401  | Not authenticated                                  |
+| 404  | No matching deleted annotation                     |

docs/developer/api/media-items/download_media_item.md

@@ -2,15 +2,19 @@
 
 Download a media item file (EPUB, PDF, etc.) from the Bookhoard server.
 
-**Endpoint**: `GET /api/media-items/:uuid/download`
-**Auth**: None (public endpoint for Kobo devices)
-**Content-Type**: Binary file download
+Book files are served by the authenticated file route, the same one the web reader uses. Build the URL from the media item's `library_id` and relative `file_path` (both returned by the media item list/get endpoints):
+
+**Endpoint**: `GET /uploads/library-{library_id}/{file_path}`
+**Auth**: Required (JWT - Bearer header or session cookie)
+
+The `file_path` segments are URL-escaped individually; slashes are preserved. `cover_image_path` uses the same route.
 
 ## Path Parameters
 
-| Parameter | Type   | Required | Description     |
-| --------- | ------ | -------- | --------------- |
-| uuid      | string | Yes      | Media item UUID |
+| Parameter   | Type   | Required | Description                          |
+| ----------- | ------ | -------- | ------------------------------------ |
+| library_id  | string | Yes      | Library UUID (the item's library)    |
+| file_path   | string | Yes      | The item's relative `file_path`      |
 
 ## Response
 
@@ -18,25 +22,27 @@ Download a media item file (EPUB, PDF, etc.) from the Bookhoard server.
 
 **Response Headers**:
 
-- `Content-Type`: `application/epub+zip`, `application/pdf`, or appropriate MIME type
-- `Content-Disposition`: `attachment; filename="filename.epub"`
+- `Content-Type`: MIME type by file extension (`application/epub+zip`, `application/pdf`, …; `application/octet-stream` fallback)
+- `Cache-Control`: `public, max-age=86400`
 
 ## Error Responses
 
-| Code | Description                       |
-| ---- | --------------------------------- |
-| 404  | Media item not found              |
-| 500  | Server error during file download |
+| Code | Description                 |
+| ---- | --------------------------- |
+| 400  | Invalid library ID or path  |
+| 401  | Missing/invalid token       |
+| 404  | File not found on disk      |
 
 ## Example
 
 ```bash
-curl -O http://localhost:8765/api/media-items/550e8400-e29b-41d4-a716-446655440000/download
+curl -O -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8765/uploads/library/550e8400-.../books/1984.epub"
 ```
 
+(URL shape: `/uploads/library-{uuid}/{escaped-relative-path}`.)
+
 ## Notes
 
-- **Public endpoint**: No authentication required for Kobo device downloads
-- **File format**: Returns the original file format (EPUB, PDF, etc.)
-- **Kobo integration**: Designed for direct downloads from Kobo e-readers
-- **Cover images**: Use `/api/media-items/:uuid/cover` for cover images
+- **Do not rely on `GET /api/media-items/:id/download`** — it appears in older docs but is **not registered**; `MediaHandler.DownloadBook` exists as dead code. Use the file route above.
+- OPDS-capable devices may alternatively use the device-authenticated `GET /opds/devices/{deviceId}/download/{bookId}`, which supports on-the-fly format conversion (epub, kepub, pdf, cbz).

docs/developer/api/media-items/list_media_items.md

@@ -1,17 +1,22 @@
 # List Media Items
 
-Retrieve a paginated list of media items from a library.
+Retrieve a paginated list of media items, scoped to a library or across all libraries.
 
 **Endpoint**: `GET /api/media-items`
 **Auth**: Required
 
 ## Query Parameters
 
-| Parameter  | Type    | Required | Description                                     |
-| ---------- | ------- | -------- | ----------------------------------------------- |
-| library_id | string  | Yes      | Library UUID                                    |
-| limit      | integer | No       | Number of items to return (max 100, default 20) |
-| offset     | integer | No       | Number of items to skip                         |
+| Parameter  | Type   | Required | Description                                            |
+| ---------- | ------ | -------- | ------------------------------------------------------ |
+| library_id | string | No       | Library UUID. If omitted, items from all libraries are returned |
+| limit      | int    | No       | Items to return (default 50, max 1000)                 |
+| offset     | int    | No       | Items to skip (must be >= 0)                           |
+| sort       | string | No       | Sort expression, default `created_at DESC`             |
+
+### Allowed sort expressions
+
+`created_at`, `title`, `author`, `series`, `date_published`, `copyright_year`, `page_count`, `genre` — each with ` ASC` or ` DESC` (e.g. `title ASC`). Any other value silently falls back to `created_at DESC`.
 
 ## Request Headers
 
@@ -22,46 +27,121 @@ Retrieve a paginated list of media items from a library.
 ### Example Request
 
 ```http
-GET /api/media-items?library_id=uuid&limit=20&offset=0
+GET /api/media-items?library_id=uuid&limit=20&offset=0&sort=title%20ASC
 Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
 ```
 
 ## Response (200 OK)
 
+The response body is `{"data": [...]}` in both modes. The item shape differs by mode.
+
+**No total is returned** — page until fewer items than `limit` come back.
+
+### With `library_id` — full database rows
+
+Nullable columns serialize as `null`.
+
 ```json
 {
-  "media_items": [
+  "data": [
     {
       "id": "uuid",
       "library_id": "uuid",
       "title": "Book Title",
       "author": "Author Name",
+      "isbn": "978-...",
       "description": "Book description",
-      "file_path": "/path/to/book.epub",
+      "file_path": "relative/path/book.epub",
       "file_size": 1024000,
       "mime_type": "application/epub+zip",
-      "cover_image_path": "/path/to/cover.jpg",
+      "cover_image_path": "relative/path/cover.jpg",
       "series": "Series Name",
       "series_number": 1,
-      "tags": ["sci-fi", "space opera"],
-      "tags_search": ["sci fi", "space opera"],
-      "contributors": ["Author Name", "ACME CORP."],
-      "contributors_search": ["author name", "acme corp"],
+      "tags": ["sci-fi"],
+      "asin": null,
+      "date_published": "2023-06-01",
+      "publisher": null,
+      "contributors": ["Author Name"],
       "language": "en",
+      "edition": null,
       "page_count": 350,
       "genre": "Science Fiction",
       "copyright_year": 2023,
-      "created_at": "2026-01-31T10:00:00Z"
+      "goodreads_id": null,
+      "openlibrary_id": null,
+      "google_books_id": null,
+      "added_by_admin_id": "uuid",
+      "created_at": "2026-01-31T10:00:00Z",
+      "imported_at": "2026-01-31T10:00:00Z",
+      "updated_at": "2026-01-31T10:00:00Z",
+      "format_group": "epub",
+      "format_mimetype": "application/epub+zip",
+      "is_reflowable": true,
+      "has_fixed_layout": false,
+      "total_characters": 480000,
+      "chapter_count": 24
     }
-  ],
-  "total": 100
+  ]
+}
+```
+
+Note: in this mode `file_path` and `cover_image_path` are the raw relative storage paths, not URLs.
+
+### Without `library_id` — curated items with resolved URLs
+
+Across all libraries; file and cover paths are resolved to fetchable URL paths (`/uploads/...` or library-scoped paths):
+
+```json
+{
+  "data": [
+    {
+      "id": "uuid",
+      "library_id": "uuid",
+      "title": "Book Title",
+      "author": "Author Name",
+      "isbn": "978-...",
+      "description": "Book description",
+      "file_path": "/api/libraries/<uuid>/files/...",
+      "file_size": 1024000,
+      "mime_type": "application/epub+zip",
+      "cover_image_path": "/api/libraries/<uuid>/files/.../cover.jpg",
+      "series": "Series Name",
+      "series_number": 1,
+      "tags": ["sci-fi"],
+      "asin": null,
+      "date_published": "2023-06-01",
+      "publisher": null,
+      "contributors": ["Author Name"],
+      "language": "en",
+      "edition": null,
+      "page_count": 350,
+      "genre": "Science Fiction",
+      "created_at": "2026-01-31T10:00:00Z",
+      "updated_at": "2026-01-31T10:00:00Z",
+      "format_group": "epub",
+      "manga_type": null,
+      "reading_direction": null,
+      "series_count": null,
+      "volume": null,
+      "imprint": null,
+      "age_rating": null,
+      "web_url": null,
+      "metadata_notes": null,
+      "community_rating": null,
+      "story_arc": null,
+      "is_black_and_white": false,
+      "alternate_info": null,
+      "scan_information": null,
+      "summary": null
+    }
+  ]
 }
 ```
 
 ## Error Responses
 
-| Code | Description                               |
-| ---- | ----------------------------------------- |
-| 400  | Invalid query parameters                  |
-| 401  | Invalid or expired token                  |
-| 403  | User does not have access to this library |
+| Code | Description                                |
+| ---- | ------------------------------------------ |
+| 400  | Invalid `library_id`, `offset` < 0         |
+| 401  | Invalid or expired token                   |
+| 500  | Query failure (returned as `{"error": …}`) |

docs/developer/api/sync/kobo-protocol.md

@@ -1,5 +1,7 @@
 # Kobo Sync Protocol
 
+> **Status: Coming Soon** — Native Kobo sync is implemented server-side but not yet supported on real devices. These endpoints are under active development and may change. Until then, KOReader (which runs on Kobo hardware) is fully supported.
+
 Kobo uses a proprietary sync protocol with JSON payloads.
 
 ## Kobo Markup Sync

docs/developer/api/sync/koreader-protocol.md

@@ -32,7 +32,9 @@ KOReader uses a custom JSON-based sync protocol.
 | books[].chapter    | integer | No       | Current chapter                                      |
 | books[].epubcfi    | string  | No       | EPUB CFI location                                    |
 | books[].character  | integer | No       | Character offset                                     |
-| books[].bookmarks  | array   | No       | Array of bookmarks/highlights                        |
+| books[].bookmarks  | array   | No       | Array of bookmarks/highlights (shape, color mapping, and echo/dedup rules: see [Sync Bookmarks](../koreader/sync_bookmarks.md)) |
+| books[].deleted_highlights | array | No | Highlights deleted on the device: `[{ "dedup_key": "..." }]` — keys previously served to this device (see [Deletion propagation](#deletion-propagation)) |
+| books[].deleted_bookmarks  | array | No | Bookmarks deleted on the device: `[{ "dedup_key": "..." }]` |
 
 \* At least one of `uuid` or `sha256` should be present. The server resolves the
 book through the shared `BookResolver` with this priority: `uuid` → `sha256` →
@@ -94,6 +96,41 @@ hash differs from the primary format's hash.
 }
 ```
 
+## Book Resolution (UUID lookup)
+
+**Endpoint**: `GET /api/sync/koreader/resolve?sha256={hash}`
+**Auth**: Device token required
+
+Read-only lookup mapping a file SHA-256 to the book's UUID (format-aware,
+same `BookResolver` path as the progress push). Devices call this on the
+first open of a newly downloaded book to learn the UUID **before** their
+first pull. Full details: [Resolve Book](../koreader/resolve_book.md).
+
+This matters for conflict avoidance: a device that pushes to bootstrap its
+identity transmits its current (first-page) position, which the server
+treats as a real progress update — overwriting/conflicting with genuine
+mid-read progress from other sources. Resolve, then pull, then push.
+
+### Example Request
+
+```http
+GET /api/sync/koreader/resolve?sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
+Authorization: Bearer device-token
+```
+
+### Response (200 OK)
+
+```json
+{
+  "book_uuid": "book-uuid",
+  "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+  "title": "Book Title",
+  "author": "Author Name"
+}
+```
+
+404 when no book in the library matches the hash.
+
 ## KOReader Metadata Fetch
 
 **Endpoint**: `GET /api/sync/koreader/metadata/{book_uuid}`
@@ -135,6 +172,32 @@ returned so clients can cache it regardless of how the book was originally
 obtained. The library list endpoint (`GET /api/sync/koreader/library`) includes
 the same `sha256` field on each book.
 
+## Deletion propagation
+
+The progress push is upsert-only: absence of an annotation from
+`highlights`/`notes`/`bookmarks` is **never** interpreted as a delete (a
+client with a category disabled must not wipe the server). Deletions are
+reported explicitly:
+
+- Devices remember the `dedup_key` of every annotation the server served
+  them (persisted locally, e.g. KOReader's sidecar `bookhoard_known_keys`).
+- When one of those annotations no longer exists locally, the next push
+  lists its key in `deleted_highlights` / `deleted_bookmarks`.
+- The server tombstones the matching rows (`deleted = TRUE`, kept for the
+  retention window). Tombstones are served back to *other* devices via the
+  metadata fetch's `deleted_highlights` / `deleted_bookmarks` arrays so the
+  deletion converges everywhere.
+- A stale replay pushing the annotation's content cannot resurrect the
+  tombstone: device pushes carry no modification timestamp, so the save is
+  treated as older than the delete.
+- Restoring is possible from the web book page's deleted-annotation
+  history (`GET /api/media-items/:id/annotations/deleted`, restore/purge
+  endpoints) until the retention window lapses.
+
+Because keys are only learned from server pulls, a device-native annotation
+deleted locally is simply never pushed again — it can never be mis-flagged
+as a server annotation deletion.
+
 ## Book identification
 
 Every client/sync interface (KOReader, Kobo, OPDS, the device-link UI, and any

docs/developer/api/system/config.md

@@ -0,0 +1,77 @@
+# System Config API
+
+## Overview
+
+Raw key/value system configuration storage (backed by the `system_config` table). Unlike the typed [System Settings API](settings.md), this endpoint reads and writes arbitrary config keys as plain strings — including keys without registry metadata, such as `base_url`.
+
+**Base URL**: `/api/system`
+**Authentication**: Admin JWT token required
+**Content-Type**: `application/json`
+
+---
+
+## Endpoints
+
+### Get System Configuration
+
+Retrieve all system configuration entries as a flat key/value map.
+
+**Endpoint**: `GET /api/system/config`
+
+**Authentication**: Admin role required
+
+**Response**: **200 OK**
+
+```json
+{
+  "base_url": "http://192.168.1.100:8765",
+  "default_timezone": "America/New_York"
+}
+```
+
+**Example**:
+
+```bash
+curl -X GET https://bookhoard.example.com/api/system/config \
+  -H "Authorization: Bearer <admin_token>"
+```
+
+---
+
+### Update System Configuration
+
+Update one or more config values.
+
+**Endpoint**: `PUT /api/system/config`
+
+**Authentication**: Admin role required
+
+**Request Body**: a flat map of keys to string values. Only the supplied keys are updated.
+
+```json
+{
+  "base_url": "https://bookhoard.example.com"
+}
+```
+
+**Validation**: values for known keys are validated where applicable — for example, `default_timezone` must be a valid IANA timezone (`time.LoadLocation`); invalid values return `400` without persisting.
+
+**Response**: **200 OK** on success; `400` (invalid value/format), `401`, `403`, `500` on failure.
+
+**Example**:
+
+```bash
+curl -X PUT https://bookhoard.example.com/api/system/config \
+  -H "Authorization: Bearer <admin_token>" \
+  -H "Content-Type: application/json" \
+  -d '{"base_url": "https://bookhoard.example.com"}'
+```
+
+> **Note:** settings that appear in the typed settings registry (e.g. `default_timezone`) are better managed through [`PUT /api/system/settings`](settings.md), which also returns metadata and reload hints. Writes through either endpoint refresh the shared registry cache.
+
+---
+
+## Related Endpoints
+
+- [System Settings API](settings.md) — typed, validated tunable settings with metadata
+- `GET /api/devices/:id/sidecar` — device setup config derived from system config (see [Devices API](../devices/))

docs/developer/api/system/settings.md

@@ -1,10 +1,10 @@
-# System Scan Settings API
+# System Settings API
 
 ## Overview
 
-The System Scan Settings API allows administrators to configure system-wide scan settings that apply to all libraries. These settings control the automatic scanning behavior for the entire Bookhoard system.
+The System Settings API is the canonical way to read and write Bookhoard's tunable system settings (scanning, security, rate limits, sync, performance, and defaults). Every setting carries full metadata — type, range, category, description, and whether a restart is required — so the admin UI (and API clients) can render and validate settings generically.
 
-**Base URL**: `/api/libraries`
+**Base URL**: `/api/system`
 **Authentication**: Admin JWT token required
 **Content-Type**: `application/json`
 
@@ -12,49 +12,61 @@ The System Scan Settings API allows administrators to configure system-wide scan
 
 ## Endpoints
 
-### Get System Scan Settings
+### List All Settings
 
-Retrieve the current system-wide scan settings.
+Retrieve every known tunable setting with its current value and metadata.
 
-**Endpoint**: `GET /api/libraries/scan-settings`
+**Endpoint**: `GET /api/system/settings`
 
 **Authentication**: Admin role required
 
-**Response**:
-
-- **200 OK**: Returns current scan settings
-- **401 Unauthorized**: Invalid or missing authentication
-- **403 Forbidden**: User does not have admin role
-- **500 Internal Server Error**: Server error
-
-**Response Body**:
+**Response**: **200 OK**
 
 ```json
-{
-  "scan_poll_interval_seconds": 60,
-  "auto_scan_enabled": true
-}
+[
+  {
+    "key": "scan_poll_interval_seconds",
+    "value": "60",
+    "type": "int",
+    "min": "1",
+    "max": "3600",
+    "requires_restart": false,
+    "category": "scanner",
+    "group": "Scanning",
+    "description": "How often to scan all libraries (seconds)",
+    "is_default": true
+  }
+]
 ```
 
-**Fields**:
+**Entry fields**:
 
-- `scan_poll_interval_seconds` (integer): How often to poll for file changes in seconds (1-3600)
-- `auto_scan_enabled` (boolean): Whether auto-scanning is enabled system-wide
+| Field              | Type    | Description                                              |
+| ------------------ | ------- | -------------------------------------------------------- |
+| `key`              | string  | Setting identifier (stable API name)                     |
+| `value`            | string  | Current value (validated/clamped by the registry)        |
+| `type`             | string  | `int`, `bool`, or `string`                               |
+| `min` / `max`      | string  | Range bounds for `int` settings (omitted otherwise)      |
+| `requires_restart` | boolean | Change takes effect only after a server restart          |
+| `category`         | string  | Coarse area: `scanner`, `security`, `api`, `sync`, `performance`, `general` |
+| `group`            | string  | Sub-section shown in the admin UI                        |
+| `description`      | string  | Human-readable description                               |
+| `is_default`       | boolean | True when the current value equals the compiled default  |
 
 **Example**:
 
 ```bash
-curl -X GET https://bookhoard.example.com/api/libraries/scan-settings \
+curl -X GET https://bookhoard.example.com/api/system/settings \
   -H "Authorization: Bearer <admin_token>"
 ```
 
 ---
 
-### Update System Scan Settings
+### Update a Setting
 
-Update the system-wide scan settings.
+Validate, persist, and reload a single setting.
 
-**Endpoint**: `PUT /api/libraries/scan-settings`
+**Endpoint**: `PUT /api/system/settings`
 
 **Authentication**: Admin role required
 
@@ -62,128 +74,123 @@ Update the system-wide scan settings.
 
 ```json
 {
-  "scan_poll_interval_seconds": 30,
-  "auto_scan_enabled": true
+  "key": "scan_poll_interval_seconds",
+  "value": "30"
 }
 ```
 
-**Fields**:
+| Field   | Type   | Required | Description                     |
+| ------- | ------ | -------- | ------------------------------- |
+| `key`   | string | Yes      | Setting key (from the list)     |
+| `value` | string | Yes      | New value, as a string          |
 
-- `scan_poll_interval_seconds` (integer, required): How often to poll for file changes in seconds
-  - Minimum: 1 (1 second)
-  - Maximum: 3600 (1 hour)
-  - Default: 60
-- `auto_scan_enabled` (boolean, required): Whether auto-scanning is enabled system-wide
-  - Default: true
-
-**Response**:
-
-- **200 OK**: Settings updated successfully
-- **400 Bad Request**: Invalid request parameters
-- **401 Unauthorized**: Invalid or missing authentication
-- **403 Forbidden**: User does not have admin role
-- **500 Internal Server Error**: Server error
-
-**Success Response Body**:
+**Response**: **200 OK**
 
 ```json
 {
-  "scan_poll_interval_seconds": 30,
-  "auto_scan_enabled": true,
-  "message": "scan settings updated successfully"
+  "key": "scan_poll_interval_seconds",
+  "value": "30",
+  "type": "int",
+  "min": "1",
+  "max": "3600",
+  "requires_restart": false,
+  "category": "scanner",
+  "group": "Scanning",
+  "description": "How often to scan all libraries (seconds)",
+  "is_default": false,
+  "reload_required": false,
+  "message": ""
 }
 ```
 
-**Error Response Body**:
+- `reload_required: true` means the change takes effect only after a restart (e.g. rate limits, worker pool, lockout settings).
+- Validation is type-aware: `int` values are checked against `min`/`max`, `bool` values must parse, `default_timezone` must be a valid IANA timezone via `time.LoadLocation`, and strings must be non-empty.
 
-```json
-{
-  "error": "error message"
-}
-```
-
-**Validation Rules**:
-
-- `scan_poll_interval_seconds` must be between 1 and 3600 seconds (1 second to 1 hour)
-- Both fields are required
+**Errors**: `400` (unknown key, invalid value, out of range), `401`, `403`, `503` (settings registry not initialized).
 
 **Example**:
 
 ```bash
-curl -X PUT https://bookhoard.example.com/api/libraries/scan-settings \
+curl -X PUT https://bookhoard.example.com/api/system/settings \
   -H "Authorization: Bearer <admin_token>" \
   -H "Content-Type: application/json" \
-  -d '{
-    "scan_poll_interval_seconds": 30,
-    "auto_scan_enabled": true
-  }'
+  -d '{"key": "scan_poll_interval_seconds", "value": "30"}'
 ```
 
 ---
 
-## Behavior
+## Setting Catalog
 
-### Poll Interval
+Current tunable settings by category:
 
-The `scan_poll_interval_seconds` setting determines how often the system will poll library folders for file changes as a fallback to real-time file watching.
+**Scanner** (`scanner`)
 
-**Constraints**:
+| Key                            | Default | Range    | Restart | Description                               |
+| ------------------------------ | ------- | -------- | ------- | ----------------------------------------- |
+| `scan_poll_interval_seconds`   | `60`    | 1-3600   | No      | How often to scan all libraries (seconds) |
+| `auto_scan_enabled`            | `true`  | -        | No      | Whether auto-scanning is enabled          |
 
-- Minimum: 1 second
-- Maximum: 3600 seconds (1 hour)
-- Default: 60 seconds
+**General** (`general`)
 
-### Auto-Scan Toggle
+| Key               | Default | Restart | Description               |
+| ----------------- | ------- | ------- | ------------------------- |
+| `default_timezone`| `UTC`   | No      | System default timezone   |
 
-The `auto_scan_enabled` setting acts as a master switch for automatic scanning:
+**Security** (`security`)
 
-- When `true`: File watching and polling fallback are active for all libraries
-- When `false`: No automatic file monitoring occurs (manual scans still available)
+| Key                          | Default   | Range        | Restart | Description                                    |
+| ---------------------------- | --------- | ------------ | ------- | ---------------------------------------------- |
+| `session_duration_seconds`   | `604800`  | 300-31536000 | No      | How long a login session stays valid           |
+| `password_min_length`        | `8`       | 1-128        | No      | Minimum password length                        |
+| `password_require_upper`     | `true`    | -            | No      | Require at least one uppercase letter          |
+| `password_require_lower`     | `true`    | -            | No      | Require at least one lowercase letter          |
+| `password_require_number`    | `true`    | -            | No      | Require at least one number                    |
+| `password_require_special`   | `true`    | -            | No      | Require at least one special character         |
+| `auth_rate_limit_per_min`    | `10`      | 1-10000      | **Yes** | Global auth API rate limit (req/min)           |
+| `login_max_attempts`         | `5`       | 1-100        | **Yes** | Failed login attempts before lockout           |
+| `login_lockout_minutes`      | `15`      | 1-10080      | **Yes** | Lockout duration after failed logins           |
 
-### File Watching System
+**API** (`api`)
 
-The scan settings control the file watching system which consists of:
+| Key                             | Default | Range     | Restart | Description                          |
+| ------------------------------- | ------- | --------- | ------- | ------------------------------------ |
+| `opds_default_page_size`        | `50`    | 1-500     | No      | Default OPDS page size               |
+| `opds_max_page_size`            | `200`   | 1-1000    | No      | Maximum OPDS page size               |
+| `device_rate_sync_per_min`      | `60`    | 1-10000   | No      | Device sync requests per minute      |
+| `device_rate_progress_per_min`  | `120`   | 1-10000   | No      | Device progress requests per minute  |
+| `device_rate_metadata_per_min`  | `30`    | 1-10000   | No      | Device metadata requests per minute  |
 
-1. **Real-time file watching**: Uses fsnotify to detect file changes immediately
-2. **Polling fallback**: If file watching fails or is unavailable, polls folders at the configured interval
+**Sync** (`sync`)
 
-The system applies these settings to all configured libraries automatically on startup.
+| Key                             | Default | Range    | Restart | Description                                        |
+| ------------------------------- | ------- | -------- | ------- | -------------------------------------------------- |
+| `annotation_tombstone_ttl_days` | `30`    | 1-3650   | No      | How long deleted annotations are kept before purge |
+| `sync_queue_interval_seconds`   | `5`     | 1-3600   | **Yes** | How often the sync queue flushes                   |
+| `sync_queue_batch_size`         | `50`    | 1-10000  | **Yes** | Max items processed per sync queue flush           |
+
+**Performance** (`performance`)
+
+| Key                      | Default | Range     | Restart | Description                                 |
+| ------------------------ | ------- | --------- | ------- | ------------------------------------------- |
+| `conversion_cache_ttl_hours` | `24` | 1-720     | No      | How long converted (KEPUB) files are cached |
+| `worker_pool_size`       | `3`     | 1-100     | **Yes** | Number of background worker goroutines      |
+| `worker_queue_cap`       | `100`   | 1-10000   | **Yes** | Background worker job queue capacity        |
 
 ---
 
-## Error Codes
+## Legacy Scan Settings Routes
 
-| Status Code | Error Description                                          |
-| ----------- | ---------------------------------------------------------- |
-| 400         | Invalid request parameters (e.g., frequency outside range) |
-| 401         | Missing or invalid JWT token                               |
-| 403         | User lacks admin role                                      |
-| 500         | Internal server error (e.g., database connection issue)    |
+The older JSON routes still work for backward compatibility and now refresh the settings registry cache on write, but they are **superseded** by `GET/PUT /api/system/settings`:
+
+- `GET /api/libraries/scan-settings` — returns only `scan_poll_interval_seconds` and `auto_scan_enabled`
+- `PUT /api/libraries/scan-settings` — accepts `{ "scan_poll_interval_seconds": int, "auto_scan_enabled": bool }`
+
+Both fields are backed by the same registry entries documented above.
 
 ---
 
 ## Related Endpoints
 
-- `POST /api/libraries/{id}/scan` - Manually trigger a scan for a specific library (admin only)
-- `GET /api/libraries` - List all libraries
-- `GET /api/libraries/{id}` - Get details for a specific library
-
----
-
-## Migration Notes
-
-This API has been updated to use a new polling-based scanning system. The following changes were made:
-
-- **Changed**: `scan_frequency_minutes` renamed to `scan_poll_interval_seconds`
-- **Changed**: Unit changed from minutes to seconds (15-1440 minutes → 1-3600 seconds)
-- **Removed**: Old scheduler-based scanning system
-- **Added**: Real-time file watching with polling fallback
-- **Preserved**: API endpoint paths remain the same
-
-The new system ensures that:
-
-1. File changes are detected in real-time when possible (via fsnotify)
-2. Polling fallback catches missed events at the configured interval
-3. Settings apply to all libraries system-wide
-4. Only administrators can modify scan settings
-5. The `auto_scan_enabled` setting controls both file watching and polling
+- `GET/PUT /api/system/config` — raw key/value system configuration (see [System Config API](config.md))
+- `POST /api/scanner/scan` — trigger a manual scan (see [Scanner API](../scanner/))
+- `GET /api/admin/hash-conflicts` — duplicates found during hashing (see [Hash Conflicts API](../admin/hash-conflicts.md))

docs/index.md

@@ -11,8 +11,8 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 **[User Documentation Portal](user/user-guide.md)** - Guides for using Bookhoard features
 
 - **Device Setup**
-  - [Kobo Setup Guide](user/devices/kobo-setup.md) - Complete Kobo e-reader configuration
-  - [KOReader Setup Guide](user/devices/koreader-setup.md) - KOReader on Kindle/Kobo/PocketBook
+  - [KOReader Setup Guide](user/devices/koreader-setup.md) - KOReader on Kindle/Kobo/PocketBook hardware
+  - [Kobo Setup Guide](user/devices/kobo-setup.md) - Native Kobo sync (coming soon; use KOReader today)
 
 - **Sync Configuration**
   - [Universal Sync Guide](user/sync-guide.md) - Understanding sync, book matching, conflicts
@@ -38,12 +38,12 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
   - [Queue API](developer/api/queue/) - Sync queue management endpoints
   - [Scanner API](developer/api/scanner/) - Library scanning and automated watch mode (admin)
   - [KOReader API](developer/api/koreader/) - KOReader sync protocol endpoints
-  - [Kobo API](developer/api/kobo/) - Kobo sync protocol endpoints
+  - [Kobo API](developer/api/kobo/) - Kobo sync protocol endpoints (feature coming soon)
   - [WebSocket API](developer/api/websocket/) - Real-time sync events
 
 - **Protocol Specifications**
-  - [Kobo Sync Protocol](developer/api/sync/kobo-protocol.md) - Kobo device sync
   - [KOReader Sync Protocol](developer/api/sync/koreader-protocol.md) - KOReader sync
+  - [Kobo Sync Protocol](developer/api/sync/kobo-protocol.md) - Kobo device sync (coming soon)
   - [WebSocket API](developer/websocket-api.md) - Real-time events
 
 ### 🔧 For Operations
@@ -62,8 +62,8 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 
 **[Contributing Portal](contributing/contributing.md)** - Development workflow
 
-- [Development Guide](contributing/Development.md) - Architecture, setup, testing
-- [PROJECT_GUIDELINES.md](PROJECT_GUIDELINES.md) - Development rules and standards
+- [Development Guide](contributing/development.md) - Architecture, setup, testing
+- [../PROJECT_GUIDELINES.md](../PROJECT_GUIDELINES.md) - Development rules and standards
 
 ---
 
@@ -75,7 +75,7 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 | **Set up a device**  | [User Portal → Device Setup](user/user-guide.md)                       |
 | **Use the API**      | [Developer Portal → API Docs](developer/development.md)                |
 | **Deploy Bookhoard** | [Operations Portal → Troubleshooting](operations/troubleshooting.md)   |
-| **Contribute code**  | [Contributing Portal → Development Guide](contributing/Development.md) |
+| **Contribute code**  | [Contributing Portal → Development Guide](contributing/development.md) |
 | **Understand sync**  | [User Portal → Sync Guide](user/sync-guide.md)                         |
 
 ---
@@ -87,13 +87,13 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 | Question                    | Answer                                                 |
 | --------------------------- | ------------------------------------------------------ |
 | ...install Bookhoard?       | [README.md](../README.md) - Quick Start                |
-| ...set up my Kobo?          | [Kobo Setup Guide](user/devices/kobo-setup.md)         |
 | ...set up KOReader?         | [KOReader Setup Guide](user/devices/koreader-setup.md) |
+| ...use a Kobo?              | [Kobo Setup Guide](user/devices/kobo-setup.md) - native sync coming soon; KOReader works today |
 | ...understand sync?         | [Sync Guide](user/sync-guide.md)                       |
 | ...resolve conflicts?       | [Sync Guide](user/sync-guide.md) - Managing Conflicts  |
 | ...troubleshoot deployment? | [Troubleshooting Guide](operations/troubleshooting.md) |
 | ...use the API?             | [API Reference](developer/api-reference.md)            |
-| ...contribute code?         | [Development Guide](contributing/Development.md)       |
+| ...contribute code?         | [Development Guide](contributing/development.md)       |
 
 ### "Where is..."
 
@@ -112,7 +112,7 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 
 ### Set up a new device
 
-1. Choose your device: [Kobo](user/devices/kobo-setup.md) or [KOReader](user/devices/koreader-setup.md)
+1. Choose your device: [KOReader](user/devices/koreader-setup.md) (works on Kindle, Kobo, and PocketBook hardware)
 2. Understand sync: [Sync Guide](user/sync-guide.md)
 3. Troubleshoot: Device-specific guides
 
@@ -128,7 +128,7 @@ Complete guide to Bookhoard documentation. Find what you need quickly.
 1. Follow [README.md](../README.md) quick start
 2. Configure environment: [.env.example](../.env.example)
 3. Review [Troubleshooting Guide](operations/troubleshooting.md)
-4. Check [Development Guide](contributing/Development.md) for performance tuning
+4. Check [Development Guide](contributing/development.md) for performance tuning
 
 ---
 
@@ -138,12 +138,12 @@ When adding new features:
 
 1. **User-facing features** → Update relevant User docs
 2. **API endpoints** → Update [API Reference](developer/api-reference.md) & split docs
-3. **Backend changes** → Update [Development Guide](contributing/Development.md)
+3. **Backend changes** → Update [Development Guide](contributing/development.md)
 4. **Deployment changes** → Update [Operations Portal](operations/operations.md)
 
-Keep [PROJECT_GUIDELINES.md](PROJECT_GUIDELINES.md) in mind for documentation standards.
+Keep [../PROJECT_GUIDELINES.md](../PROJECT_GUIDELINES.md) in mind for documentation standards.
 
 ---
 
-**Last Updated**: 2026-02-08
+**Last Updated**: August 2026
 **Bookhoard Version**: 1.0

docs/user/admin-library-management.md

@@ -8,12 +8,12 @@ When creating or managing a library, you can add folders containing your media f
 
 The admin library page includes a folder browser to help you select folders on the server:
 
-1. Navigate to **Admin → Library Management**
-2. Find the library you want to manage
-3. Click the **Folders** button
-4. Click **Browse** next to "Add folder path"
+1. Open the **Administration** panel in the sidebar (admins only) and go to **Libraries**
+2. Click a library in the list to expand its panel
+3. Find the **Folders** section
+4. Click **Browse** next to the folder path input — this opens the **Browse Folders** dialog
 5. Navigate through the server's filesystem
-6. Select a folder by clicking **Select This Folder**
+6. Select a folder; it fills the path input, then click **Add**
 
 ### Security
 

docs/user/calibre-integration.md

@@ -58,20 +58,22 @@ Calibre Library/
 
 ### Step 2: Add Library in Bookhoard
 
-1. Navigate to **Admin** → **Libraries**
-2. Click **Add Library**
+1. Open the **Administration** panel in the sidebar and go to **Libraries**
+2. Click **Create Library**
 3. Configure:
-   - **Name**: "My Calibre Library"
-   - **Type**: Ebook (or Audiobook/Comic)
-   - **Folder**: Path to your Calibre library
-   - **Scan on save**: ✅ Checked
-4. Click **Save**
+   - **Library Name**: "My Calibre Library"
+   - **Description**: Optional
+   - **Library Type**: Ebook (or Audiobook/Comic)
+4. Click the library in the list to expand its panel
+5. Add your Calibre library folder in the **Folders** section:
+   - Enter the path (or click **Browse** to find it on the server) and click **Add**
+6. Trigger a scan (see below), or rely on watch mode if enabled
 
-Bookhoard will automatically scan the library and import all books with their Calibre metadata.
+Bookhoard scans the library and imports all books with their Calibre metadata. Scan progress shows in the sidebar next to the logo.
 
 ### Step 3: Verify Import
 
-1. Navigate to **Library** view
+1. Open the **Dashboard** or **All Books** page (sidebar navigation)
 2. Browse your imported books
 3. Check that:
    - Titles and authors are correct
@@ -136,8 +138,8 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 **Scenario**: You have a Calibre library with 500 ebooks, all organized with series, tags, and custom covers.
 
 **Steps**:
-1. Add the Calibre library folder in Bookhoard
-2. Enable "Scan on save"
+1. Add the Calibre library folder in Bookhoard (Administration → Libraries → expand the library → **Folders**)
+2. Trigger a scan via the **Scanner API**, or let watch mode pick up the changed files (the File Watcher status is shown on the admin dashboard)
 3. Bookhoard imports all 500 books with:
    - Correct titles and authors
    - Series information (e.g., "Harry Potter #2")
@@ -166,9 +168,8 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 **Steps**:
 1. Edit metadata in Calibre (it updates `metadata.opf`)
 2. In Bookhoard, trigger a rescan:
-   - Navigate to **Admin** → **Libraries**
-   - Click **Rescan** on your library
-   - Or use the **Scanner API** to force rescan
+   - Via the **Scanner API** (`POST /api/scanner/scan`), or
+   - Let watch mode detect the changed files automatically (see File Watcher on the admin dashboard)
 3. Bookhoard detects updated `metadata.opf` and refreshes metadata
 
 **Result**: Bookhoard reflects your Calibre changes automatically.
@@ -182,7 +183,7 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 **Solutions**:
 1. **Check file structure**: Ensure `metadata.opf` is in the same folder as the book file
 2. **Verify library type**: Ensure library type matches content (ebook vs. audiobook)
-3. **Force rescan**: Use the "Force Rescan" option to re-import all metadata
+3. **Force rescan**: Trigger a scan via the Scanner API to re-import all metadata (watch mode also picks up changed files automatically)
 4. **Check logs**: Review Bookhoard logs for parsing errors
 
 ### Incorrect Metadata
@@ -219,7 +220,7 @@ As long as a `metadata.opf` file exists in the folder, Bookhoard will import the
 
 **Do**:
 - ✅ Edit metadata in Calibre
-- ✅ Rescan in Bookhoard to sync changes
+- ✅ Let Bookhoard's next scan (or watch mode) pick up the changes
 - ✅ Use Calibre for library management
 
 **Don't**:
@@ -259,12 +260,11 @@ Stay tuned for updates!
 
 ### OPDS Integration
 
-You can access your Bookhoard library (including Calibre-imported books) via OPDS from Calibre-aware devices:
-- Kobo e-readers
-- KOReader
+You can access your Bookhoard library (including Calibre-imported books) via OPDS from OPDS-capable clients:
+- KOReader (Kindle, Kobo, PocketBook hardware)
 - Phone/tablet apps (KYBook, Chunky, etc.)
 
-See the [Kobo Setup Guide](devices/kobo-setup.md) or [KOReader Setup Guide](devices/koreader-setup.md) for details.
+See the [KOReader Setup Guide](devices/koreader-setup.md) for details.
 
 ## FAQ
 

docs/user/collections.md

@@ -6,7 +6,7 @@ Collections allow you to organize books across multiple libraries.
 
 ### From Collections Page
 
-Navigate to `/collections` to see all your collections. Clicking on a collection shows ALL books in that collection across all libraries.
+Navigate to **Collections** (sidebar navigation) to see all your collections. Clicking on a collection shows ALL books in that collection across all libraries.
 
 ### From Dashboard
 
@@ -19,8 +19,24 @@ When viewing a specific library's dashboard, collections only show books from th
 
 ## Creating Collections
 
-[Instructions for creating collections]
+1. Go to **Collections** (sidebar navigation)
+2. Click **New Collection** (top-right) — or **Create Your First Collection** if the list is empty
+3. Fill in the details:
+   - **Name** - Collection name
+   - **Description** - Optional description
+   - **Icon** - Pick from the icon grid
+   - **Color** - Pick a color swatch
+4. Click **Create Collection**
 
 ## Managing Collections
 
-[Instructions for editing/deleting collections]
+Each collection in the list has icon buttons on its card:
+
+- **Edit** - Opens the edit form to change name, description, icon, or color. Click **Update Collection** to save.
+- **Delete** - Removes the collection after a confirmation prompt.
+
+Deleted a system collection by mistake? The **Restore System** button on the Collections page brings back system collections.
+
+### Dashboard Sections
+
+Collections appear as sections on your dashboard. Show, hide, and reorder them from the dashboard's **Customize Dashboard** settings (see [Dashboard](dashboard.md)).

docs/user/dashboard.md

@@ -16,28 +16,27 @@ Smart sections are automatically generated based on your reading activity:
 
 ### User Collections
 
-Any collection marked with "Show on Dashboard" will appear as a section on your dashboard.
+Your collections appear as sections on the dashboard. To show or hide a collection's section:
 
-To enable a collection:
-
-1. Go to Collections
-2. Edit a collection
-3. Toggle "Show on Dashboard"
-4. Save
+1. Select the library in the **Library** bar
+2. Click the **Customize Dashboard** icon button
+3. Toggle the collection on or off
+4. Click "Save Changes"
 
 ### Customizing Your Dashboard
 
-1. Click the ⚙️ (gear icon) in the top-right
-2. **Drag sections** to reorder them
-3. **Toggle visibility** with the switches
-4. **Adjust items per section** (10-50 items)
-5. Click "Save Changes"
+1. In the **Library** bar below the top bar, select the library you want to customize (a specific library, not "All Libraries")
+2. Click the **Customize Dashboard** icon button at the right end of the Library bar (next to Refresh)
+3. **Drag sections** to reorder them
+4. **Toggle visibility** with the switches
+5. **Adjust items per section** (10-50 items)
+6. Click "Save Changes"
 
 Settings are saved per library.
 
 ### Library Switching
 
-Use the dropdown in the sticky header to switch between libraries. Each library has its own dashboard settings.
+Use the **Library** dropdown in the bar below the top bar to switch between libraries (including "All Libraries"). Each library has its own dashboard settings.
 
 ### Keyboard Navigation
 
@@ -45,6 +44,8 @@ Use the dropdown in the sticky header to switch between libraries. Each library
 - **Arrow Keys**: Scroll carousels horizontally
 - **Enter**: Open selected book
 
+Hovering a carousel shows chevron buttons on either side for scrolling.
+
 ### Touch Gestures (Mobile)
 
 - **Swipe**: Drag carousel left/right to scroll

docs/user/devices/kobo-setup.md

@@ -1,650 +1,42 @@
 # Kobo Device Setup Guide
 
-This guide will help you set up your Kobo e-reader to sync with Bookhoard for seamless cross-device reading progress synchronization.
+> ## 🚧 Coming Soon
+>
+> Native Kobo sync is not available yet. It is actively being developed and this guide will be filled in as the feature lands.
 
-## What is Kobo Sync?
+## Using a Kobo With Bookhoard Today
 
-Bookhoard implements a Kobo-compatible sync protocol that allows your Kobo device to:
+You don't have to wait: **KOReader runs on Kobo hardware** and syncs fully with Bookhoard today — reading position, bookmarks, highlights, and notes, plus OPDS wireless book delivery.
 
-- Sync reading progress across all your devices
-- Sync highlights and bookmarks
-- Sync reading statistics
-- Maintain device-specific metadata
+See the **[KOReader Setup Guide](koreader-setup.md)** for complete instructions.
 
-## Prerequisites
+## What's Planned for Native Kobo Sync
 
-Before you begin, make sure you have:
+When released, native Kobo sync will let stock Kobo firmware talk directly to Bookhoard:
 
-- ✅ A Kobo e-reader device (Clara, Aura, Nia, Libra, Sage, Elipsa, etc.)
-- ✅ A Bookhoard instance running and accessible on your network
-- ✅ Your Bookhoard credentials (username and password)
-- ✅ USB cable to connect your Kobo to your computer
-- ✅ Your Kobo connected to the same Wi-Fi network as your Bookhoard instance
+- **Reading position sync** — percentages, pages, and reading statistics
+- **Bookmarks, highlights, and notes** — synced with the web and other devices
+- **OPDS wireless delivery** — browse and download books directly on the Kobo
+- **Automatic EPUB → KEPUB conversion** — for better Kobo rendering
+- **Shelf mappings** — Bookhoard collections appearing as Kobo shelves
 
-## Supported Kobo Devices
-
-Bookhoard supports all Kobo devices that use the standard Kobo sync protocol:
-
-- **Kobo Clara**: Clara 2E, Clara HD
-- **Kobo Aura**: Aura, Aura H2O, Aura ONE, Aura Edition 2
-- **Kobo Libra**: Libra 2, Libra H2O
-- **Kobo Forma**: All versions
-- **Kobo Sage**: All versions
-- **Kobo Elipsa**: All versions
-- **Kobo Nia**: All versions
-- **Kobo Touch**: Touch 2.0
-- **Kobo Glo**: Glo, Glo HD
-
-## Device Registration
-
-### Step 1: Find Your Kobo Serial Number
-
-1. Turn on your Kobo device
-2. Go to **Settings** (gear icon)
-3. Select **Device Information**
-4. Note your **Device Serial Number** (e.g., N1234567890123)
-   - This is your device identifier for registration
-
-### Step 2: Register Your Device in Bookhoard
-
-1. Log in to your Bookhoard web interface
-2. Navigate to **Device Management** → **Add New Device**
-3. Fill in the device details:
-   - **Device Name**: A friendly name (e.g., "My Kobo Clara")
-   - **Device Type**: Select "Kobo"
-   - **Device Identifier**: Enter your Kobo serial number
-4. Click **Register Device**
-
-You'll receive:
-
-- An **Auth URL** to approve the device
-- Instructions for manual configuration
-
-### Step 3: Approve Your Device
-
-1. **Method A: QR Code**
-   - If displayed, scan the QR code with your phone's camera
-   - This will open the approval page in your browser
-   - Log in and click **Approve**
-
-2. **Method B: Manual URL**
-   - Copy the Auth URL from the registration confirmation
-   - Open it in your web browser
-   - Log in to your Bookhoard account
-   - Click **Approve Device**
-
-Your device is now registered and ready for configuration!
-
-## Configure Kobo Sync
-
-### Step 1: Connect Kobo to Your Computer
-
-1. Use your USB cable to connect Kobo to your computer
-2. Your computer should recognize Kobo as a storage device
-3. Kobo will show "Connected" and "Eject before disconnecting"
-
-### Step 2: Edit Kobo Configuration File
-
-#### Windows Users
-
-1. Open **File Explorer** and navigate to your Kobo device
-2. Open the `.kobo` folder (hidden folder)
-3. Open `Kobo/Kobo eReader.conf` in a text editor (Notepad++, VS Code, etc.)
-
-#### Mac Users
-
-1. Kobo device appears on your Desktop
-2. Right-click the Kobo volume and select **Show Package Contents**
-3. Navigate to `.kobo/Kobo/Kobo eReader.conf`
-4. Open in a text editor (TextEdit, VS Code, etc.)
-
-#### Linux Users
-
-1. Kobo mounts at `/media/USERNAME/Kobo` or similar
-2. Navigate to `.kobo/Kobo/Kobo eReader.conf`
-3. Open in a text editor
-
-### Step 3: Add Bookhoard Sync Configuration
-
-After device registration is complete, you'll receive an API key and sync URL from Bookhoard.
-
-Add the following section to the end of your `Kobo eReader.conf` file:
-
-```ini
-[FeatureSettings]
-# Enable Kobo store replacement
-KoboStoreSyncDisabled=true
-
-[Sync]
-# Bookhoard Sync Configuration (from Device Management page)
-ServerURL=http://YOUR_COMPUTER_IP:8765/api/sync/kobo/YOUR_API_KEY
-AutoSyncEnabled=true
-SyncFrequency=5
-```
-
-**Where to find these values**:
-
-- `YOUR_COMPUTER_IP`: Your Bookhoard server's IP address (e.g., 192.168.1.100)
-- `YOUR_API_KEY`: Copy from Bookhoard Device Management → Your Kobo Device → "Copy Sync URL"
-
-**Example configuration**:
-
-```ini
-[Sync]
-ServerURL=http://192.168.1.100:8765/api/sync/kobo/dev_abc123def456
-AutoSyncEnabled=true
-SyncFrequency=5
-```
-
-**Important Notes**:
-
-- The API key is generated during device registration
-- You can regenerate the API key anytime from Device Management if needed
-- Keep your API key confidential like a password
-- Bookhoard uses revocable API keys for security (not username/password)
-
-**Replace the following with your actual values**:
-
-- `YOUR_COMPUTER_IP`: Your computer's local IP address (e.g., 192.168.1.100)
-- `YOUR_BOOKHOARD_USERNAME`: Your Bookhoard email or username
-- `YOUR_BOOKHOARD_PASSWORD`: Your Bookhoard password
-
-**Example configuration:**
-
-```ini
-[Sync]
-ServerURL=http://192.168.1.100:8765/api/sync/kobo
-AutoSyncEnabled=true
-SyncFrequency=5
-Username=john@example.com
-Password=securePassword123
-```
-
-### Step 4: Save and Eject
-
-1. Save the `Kobo eReader.conf` file
-2. Safely eject your Kobo device from your computer
-3. Kobo will restart automatically
-
-### Step 5: Verify Sync on Kobo
-
-1. After Kobo restarts, go to **Settings** → **Sync & Backup**
-2. You should see "Bookhoard" listed as a sync provider
-3. Tap **Sync Now** to test the connection
-4. If successful, you'll see a "Sync Complete" message
-
-## Sync Features
-
-### Reading Progress Sync
-
-Kobo syncs:
-
-- **Percentage Read**: Overall book completion percentage
-- **Page Number**: Current page in fixed-layout books
-- **Time Spent**: Reading time statistics
-- **Last Read**: Timestamp of last reading session
-
-### Annotations Sync
-
-Kobo syncs:
-
-- **Bookmarks**: Page positions saved for quick access
-- **Highlights**: Highlighted text passages
-- **Notes**: Notes attached to highlights
-- **Reading Statistics**: Pages read, time spent
-
-### Shelf Management
-
-Kobo syncs:
-
-- **Book Collections**: Your organized shelves
-- **Shelf Contents**: Books in each collection
-- **Sync Metadata**: When shelves were last updated
-
-## OPDS Wireless Book Delivery
-
-### What is OPDS?
-
-OPDS (Open Publication Distribution System) allows your Kobo to **wirelessly download books** from Bookhoard - no USB cable needed!
-
-### OPDS Benefits
-
-- **No USB Required**: Download books directly to your Kobo over Wi-Fi
-- **On-Demand Delivery**: Browse your Bookhoard library from your Kobo
-- **Collection Support**: Download books from specific collections
-- **Progress Tracking**: Books downloaded via OPDS sync progress automatically
-- **Format Conversion**: Automatic EPUB to KEPUB conversion for better Kobo support
-
-### Enable OPDS on Your Kobo
-
-#### Option 1: Automatic Configuration (Recommended)
-
-1. After registering your Kobo device, a **Download Configuration** button appears
-2. Click **Download Configuration** to get a `.kobo` configuration file
-3. Copy this file to your Kobo's `.kobo/` directory via USB
-4. Eject and restart your Kobo
-5. OPDS catalog will automatically appear in your Kobo's store
-
-#### Option 2: Manual Configuration
-
-1. Connect your Kobo to your computer via USB
-2. Navigate to `.kobo/Kobo/Kobo eReader.conf`
-3. Add the following configuration:
-
-```ini
-[FeatureSettings]
-# Enable OPDS catalog
-OPDSCatalogEnabled=true
-OPDSCatalogURL=http://YOUR_COMPUTER_IP:8765/opds/devices/YOUR_DEVICE_ID/catalog?token=YOUR_API_KEY
-
-# Example:
-# OPDSCatalogURL=http://192.168.1.100:8765/opds/devices/kobo-clara-123/catalog?token=dev_abc123def456
-```
-
-4. Replace:
-   - `YOUR_COMPUTER_IP`: Your Bookhoard server IP
-   - `YOUR_DEVICE_ID`: Your Kobo's device ID from Bookhoard Device Management
-   - `YOUR_API_KEY`: Your Kobo device's API key (same as in sync URL)
-
-5. Save the file and safely eject your Kobo
-
-### Access OPDS Catalog on Kobo
-
-1. Wake your Kobo and connect to Wi-Fi
-2. Go to **Home** → **Store** (or **Shop**)
-3. You'll see **Bookhoard** listed as a store
-4. Tap to enter the Bookhoard catalog
-
-### Browse and Download Books
-
-#### Browse All Books
-
-1. In the Bookhoard catalog, you'll see all books from your library
-2. Browse by:
-   - **Recently Added**: Latest books in your library
-   - **Collections**: Books organized by collections
-   - **Authors**: Books grouped by author
-   - **Series**: Books in reading order
-
-#### Download a Book
-
-1. Tap on any book cover to see details
-2. Tap **Download** or **Add to Library**
-3. The book downloads wirelessly to your Kobo
-4. Progress bar shows download status
-5. Once downloaded, the book appears in your **Home** library
-
-#### Download from Collections
-
-1. In the Bookhoard catalog, tap **Collections**
-2. Select a collection (e.g., "Science Fiction")
-3. Browse books in that collection
-4. Tap to download individual books
-5. Or tap **Download All** to get entire collection
-
-### OPDS Features
-
-#### Format Support
-
-Kobo OPDS supports:
-
-- **EPUB**: Standard ebook format (recommended)
-- **KEPUB**: Kobo-optimized EPUB (better page turns, fonts)
-- **PDF**: Fixed-layout documents
-
-**Automatic Conversion**: Bookhoard automatically converts EPUB to KEPUB on-the-fly for better Kobo experience.
-
-#### Progress Sync
-
-Books downloaded via OPDS automatically sync progress:
-
-1. Download a book via OPDS
-2. Start reading on your Kobo
-3. Progress syncs to Bookhoard automatically
-4. Continue reading on any other device!
-
-#### Collection to Shelf Mapping
-
-Bookhoard maps your collections to Kobo shelves:
-
-- Collection **"Science Fiction"** → Kobo shelf **"Sci-Fi"**
-- Collection **"To Read"** → Kobo shelf **"To Read"**
-- Customizable in Bookhoard Device Management
-
-### OPDS Troubleshooting
-
-#### Catalog Not Appearing
-
-**Problem**: Bookhoard catalog doesn't show in Kobo store
-
-**Solutions**:
-
-1. Verify OPDS URL is correct in config file
-2. Check Kobo is connected to Wi-Fi
-3. Try accessing OPDS URL in your browser
-4. Ensure device ID matches Bookhoard device ID
-5. Restart Kobo after editing config file
-
-#### Download Fails
-
-**Problem**: Book download starts but fails partway through
-
-**Solutions**:
-
-1. Check Wi-Fi signal strength
-2. Ensure Bookhoard server is running
-3. Verify book file exists in Bookhoard library
-4. Try downloading a smaller book first
-5. Check Bookhoard logs for errors
-
-#### Book Downloads But Won't Open
-
-**Problem**: Downloaded book shows error when opening
-
-**Solutions**:
-
-1. Verify book format is supported (EPUB/KEPUB/PDF)
-2. Check file isn't corrupted in Bookhoard
-3. Try downloading via USB and opening
-4. Check Kobo has sufficient free storage
-5. Restart your Kobo device
-
-#### Slow Download Speed
-
-**Problem**: Books take too long to download
-
-**Solutions**:
-
-1. Ensure strong Wi-Fi signal (stay near router)
-2. Use 5GHz Wi-Fi if your Kobo supports it
-3. Close other apps using bandwidth
-4. Download smaller books first
-5. Consider using USB for large books
-
-### OPDS vs USB Transfer
-
-| Feature              | OPDS (Wireless)               | USB Transfer              |
-| -------------------- | ----------------------------- | ------------------------- |
-| **Convenience**      | ⭐⭐⭐⭐⭐ No cable needed    | ⭐⭐ Requires cable       |
-| **Speed**            | ⭐⭐⭐ Fast (Wi-Fi dependent) | ⭐⭐⭐⭐⭐ Very fast      |
-| **Bulk Transfer**    | ⭐⭐⭐ One at a time          | ⭐⭐⭐⭐⭐ Many at once   |
-| **Progress Sync**    | ⭐⭐⭐⭐⭐ Automatic          | ⭐⭐⭐⭐ After first sync |
-| **Setup Complexity** | ⭐⭐⭐ Moderate               | ⭐⭐⭐⭐⭐ Simple         |
-| **Reliability**      | ⭐⭐⭐⭐ Good                 | ⭐⭐⭐⭐⭐ Excellent      |
-
-**Recommendation**: Use OPDS for convenience (1-5 books), use USB for bulk transfers (10+ books).
-
-### Advanced OPDS Configuration
-
-#### Custom Catalog Name
-
-Change the name of the Bookhoard catalog on your Kobo:
-
-```ini
-[OPDS]
-CatalogName=My Library
-```
-
-#### Auto-Download
-
-Automatically download new books added to collections:
-
-```ini
-[OPDS]
-AutoDownloadEnabled=true
-AutoDownloadCollections=To Read,Recent
-```
-
-#### Download Quality
-
-Choose between original EPUB or converted KEPUB:
-
-```ini
-[OPDS]
-PreferredFormat=kepub  # Options: epub, kepub, auto
-```
-
-## Sync Frequency Options
-
-Configure how often Kobo syncs with Bookhoard:
-
-```ini
-[Sync]
-# Sync frequency in minutes
-SyncFrequency=5   # Sync every 5 minutes (recommended)
-SyncFrequency=15  # Sync every 15 minutes
-SyncFrequency=60  # Sync every hour
-SyncFrequency=0   # Manual sync only
-```
-
-**Recommended**: `SyncFrequency=5` for near real-time sync
-**Battery Saving**: `SyncFrequency=15` or `30` to reduce Wi-Fi usage
-**Manual Only**: `SyncFrequency=0` sync only when you press "Sync Now"
-
-## Manual Sync
-
-To manually trigger a sync on your Kobo:
-
-1. Connect Kobo to Wi-Fi
-2. Go to **Settings** → **Sync & Backup**
-3. Tap **Sync Now**
-4. Wait for "Sync Complete" message
-
-## Advanced Configuration
-
-### Disable Kobo Store
-
-To prevent Kobo from trying to connect to the official Kobo store:
-
-```ini
-[FeatureSettings]
-KoboStoreSyncDisabled=true
-```
-
-### Custom Sync URL
-
-If you're running Bookhoard with a custom domain or port:
-
-```ini
-[Sync]
-# Custom domain
-ServerURL=https://bookhoard.example.com/api/sync/kobo
-
-# Custom port
-ServerURL=http://192.168.1.100:9000/api/sync/kobo
-
-# Localhost (for testing)
-ServerURL=http://localhost:8765/api/sync/kobo
-```
-
-### HTTPS Configuration
-
-If you have SSL/TLS configured on Bookhoard:
-
-```ini
-[Sync]
-ServerURL=https://bookhoard.yourdomain.com/api/sync/kobo/YOUR_API_KEY
-```
-
-Replace `YOUR_API_KEY` with your device's API key from Bookhoard Device Management.
-
-Kobo will automatically trust the certificate if properly configured.
-
-## Troubleshooting
-
-### Sync Not Working
-
-**Problem**: Sync doesn't happen automatically
-
-**Solutions**:
-
-1. Check Kobo is connected to Wi-Fi
-2. Verify `AutoSyncEnabled=true` in config
-3. Check `SyncFrequency` is not set to 0
-4. Test with manual sync first
-5. Check Bookhoard logs for connection attempts
-
-### Connection Refused
-
-**Problem**: "Connection refused" or "Server not reachable"
-
-**Solutions**:
-
-1. Verify Bookhoard is running on your computer
-2. Check the server URL and IP address are correct
-3. Ensure Kobo is on same Wi-Fi network as computer
-4. Temporarily disable firewall to test
-5. Try accessing Bookhoard URL in your browser first
-
-### Authentication Failed
-
-**Problem**: "Authentication failed" or "Invalid API key"
-
-**Solutions**:
-
-1. Verify the API key in your sync URL matches the one in Bookhoard Device Management
-2. Check that device is approved in Bookhoard (not pending)
-3. Try regenerating the API key from Device Management page
-4. Ensure the sync URL is complete (includes the API key)
-5. Copy the sync URL directly from Device Management → "Copy Sync URL" button
-
-### Configuration File Not Saving
-
-**Problem**: Changes to `Kobo eReader.conf` are lost
-
-**Solutions**:
-
-1. Make sure Kobo is ejected safely after editing
-2. Check file permissions (should be writable)
-3. Try a different text editor (Notepad++, VS Code, Sublime Text)
-4. Backup the file before editing
-5. On Mac, ensure you're not editing the package directly
-
-### Sync Only Works Manually
-
-**Problem**: Manual sync works, but auto-sync doesn't
-
-**Solutions**:
-
-1. Verify `AutoSyncEnabled=true` in config
-2. Check `SyncFrequency` is not 0
-3. Kobo only syncs when connected to Wi-Fi
-4. Some Kobo models require Wi-Fi to be manually connected
-5. Check Bookhoard device management page for connection errors
-
-### Books Not Appearing in Kobo
-
-**Problem**: Books added to Bookhoard don't show on Kobo
-
-**Solutions**:
-
-1. Kobo needs books to be sideloaded (manually transferred via USB)
-2. Bookhoard syncs PROGRESS, not book files
-3. Transfer book files to Kobo's `Documents` folder via USB
-4. Kobo will then sync progress for those books with Bookhoard
-5. Check that book formats are supported by Kobo
-
-### Conflicts Not Showing
-
-**Problem**: Conflicts between devices aren't being detected
-
-**Solutions**:
-
-1. Check Bookhoard Conflicts page
-2. Ensure both devices have synced recently
-3. Conflicts only detected when progress differs within 5 minutes
-4. Manually sync both devices to trigger conflict detection
-5. Review conflict resolution settings
-
-## Security Best Practices
-
-1. **Use HTTPS**: If deploying Bookhoard publicly, configure SSL/TLS
-2. **Strong Password**: Use a secure password for your Bookhoard account
-3. **Network Security**: Ensure your Wi-Fi network is secure (WPA2/WPA3)
-4. **Regular Updates**: Keep Kobo firmware updated
-5. **Device Authorization**: Only approve devices you recognize
-
-## Network Configuration
-
-### Local Network (Recommended)
-
-For home use, keep Kobo and Bookhoard on the same local network:
-
-```
-Kobo Wi-Fi: 192.168.1.x
-Bookhoard: 192.168.1.x
-```
-
-### Remote Access
-
-For access outside your home network:
-
-1. Set up port forwarding on your router (port 8765)
-2. Configure SSL/TLS on Bookhoard
-3. Use a dynamic DNS service for constant hostname
-4. Update Kobo config with public URL including API key:
-   ```ini
-   [Sync]
-   ServerURL=https://yourdomain.com/api/sync/kobo/YOUR_API_KEY
-   ```
-
-## Performance Optimization
-
-### Battery Life
-
-To extend Kobo battery life:
-
-1. Use longer sync intervals (15-30 minutes)
-2. Sync only on Wi-Fi (not cellular if your Kobo has it)
-3. Disable unnecessary Kobo features
-4. Keep Kobo in sleep mode when not reading
-
-### Sync Speed
-
-To improve sync speed:
-
-1. Ensure strong Wi-Fi signal
-2. Use local network (not remote access)
-3. Keep Bookhoard and Kobo on same network
-4. Close other apps using Wi-Fi bandwidth
-5. Reduce number of books syncing at once
-
-## Additional Resources
-
-- [Kobo Developer Documentation](https://help.kobo.com/hc/en-us)
-- [Bookhoard Universal Sync Guide](../sync-guide.md)
-- [KOReader Setup Guide](koreader-setup.md)
-- [Bookhoard API Reference](../../developer/api-reference.md)
+The server-side protocol endpoints are already implemented and under test; the feature will be announced when it's ready for real devices.
 
 ## FAQ
 
-**Q: Can I sync books (files) between devices?**  
-A: No, Bookhoard only syncs reading progress and annotations. You must sideload book files to each device manually.
+**Q: Should I buy a Kobo to use with Bookhoard today?**
+A: Kobo devices work great with Bookhoard via KOReader. Native (stock firmware) sync is coming soon.
 
-**Q: Will Kobo update automatically when I add books in Bookhoard?**  
-A: No, Kobo doesn't fetch book files from Bookhoard. You must transfer books via USB.
+**Q: What happens to my KOReader setup when native sync arrives?**
+A: Nothing — KOReader will keep working. Native sync simply adds another option for people who prefer stock Kobo firmware.
 
-**Q: Can I use both Kobo Sync and Calibre?**  
-A: Yes, but they may conflict. It's recommended to choose one sync method.
+## Additional Resources
 
-**Q: What happens if I read the same book on Kobo and KOReader?**  
-A: Bookhoard will detect conflicts and you can resolve them in the Conflicts UI.
-
-**Q: Does Kobo sync when in sleep mode?**  
-A: Only if Wi-Fi is enabled and configured to stay active during sleep.
-
-## Support
-
-If you encounter issues:
-
-1. Check the troubleshooting section above
-2. Review Kobo sync logs in device settings
-3. Check Bookhoard sync queue and device management pages
-4. Verify your configuration file is saved correctly
-5. Open an issue on the Bookhoard GitHub repository
+- [KOReader Setup Guide](koreader-setup.md) — works on Kobo today
+- [Bookhoard Universal Sync Guide](../sync-guide.md)
+- [Bookhoard API Reference](../../developer/api-reference.md)
 
 ---
 
-**Last Updated**: 2026-01-31  
-**Bookhoard Version**: 1.0  
-**Kobo Firmware**: 4.30.0+
+**Last Updated**: August 2026
+**Bookhoard Version**: 1.0

docs/user/devices/koreader-setup.md

@@ -9,18 +9,19 @@ KOReader is an open-source e-reader application that supports a wide range of e-
 - Kindle devices (Paperwhite, Oasis, Voyage, etc.)
 - Kobo devices (Clara, Aura, Nia, etc.)
 - PocketBook devices
-- Android tablets and phones
+
+It also runs on Android tablets and phones, although Bookhoard's dedicated mobile apps (coming later) will be the better option there.
 
 ## Prerequisites
 
 Before you begin, make sure you have:
 
 - ✅ A Bookhoard instance running and accessible on your network
-- ✅ Your Bookhoard credentials (username and password)
+- ✅ A web browser logged in to your Bookhoard account (for device approval)
 - ✅ A KOReader-compatible e-reader device
 - ✅ Your device connected to the same Wi-Fi network as your Bookhoard instance
 
-## Installation
+## Installing KOReader
 
 ### Kindle Devices
 
@@ -64,469 +65,132 @@ Before you begin, make sure you have:
    - Open KOReader from your apps menu
    - Enable Wi-Fi in the network settings
 
-## Device Registration
+## Connecting KOReader to Bookhoard
 
-### Step 1: Get Your Bookhoard Instance URL
+Setup is done **on the server**: you approve the device from the Bookhoard web interface — no usernames, passwords, or tokens to type on the device.
 
-Find your Bookhoard instance URL. This will typically be one of:
+### Step 1: Install the Bookhoard Plugin
 
-- **Local Network**: `http://YOUR_COMPUTER_IP:8765`
-- **Localhost (if testing)**: `http://localhost:8765`
-- **Domain (if configured)**: `https://bookhoard.yourdomain.com`
+1. Clone the [Bookhoard KOReader plugin](https://git.linuxhg.com/Bookhoard/bookhoard.koplugin)
+2. Copy it to your KOReader `plugins/` directory
+3. Restart KOReader
 
-### Step 2: Register Your Device in Bookhoard
+### Step 2: Point the Plugin at Your Server
 
-1. Log in to your Bookhoard web interface
-2. Navigate to **Device Management** → **Add New Device**
-3. Fill in the device details:
-   - **Device Name**: A friendly name (e.g., "My Kindle Paperwhite")
-   - **Device Type**: Select "KOReader"
-   - **Device Identifier**: Enter your device's hardware ID or serial number
-     - On Kindle: Settings → Device Options → Device Info → Serial Number
-     - On Kobo: Settings → Device Information → Serial Number
-4. Click **Register Device**
-
-You'll receive:
-
-- An **Auth URL** to approve the device
-- A **Device Token** (automatically generated after approval)
-
-### Step 3: Approve Your Device
-
-1. **Method A: QR Code**
-   - If displayed, scan the QR code with your phone's camera
-   - This will open the approval page in your browser
-   - Log in and click **Approve**
-
-2. **Method B: Manual URL**
-   - Copy the Auth URL from the registration confirmation
-   - Open it in your web browser
-   - Log in to your Bookhoard account
-   - Click **Approve Device**
-
-Your device is now registered and ready to sync!
-
-## Configure KOReader Sync
-
-### Step 1: Access KOReader Settings
-
-1. Open KOReader on your device
-2. Tap the menu icon (≡) in the top-left corner
-3. Select **Tools** → **Calibre**
-
-### Step 2: Configure Wireless Connection
-
-1. **Enable Calibre Wireless Connection**: Toggle ON
-2. **Server Address**: Enter your Bookhoard instance URL
+1. Open KOReader, tap the **wrench icon** at the top
+2. Find and tap **Bookhoard sync**
+3. Tap **Server URL**, enter your server address, then tap **OK**:
 
    ```
-   http://YOUR_COMPUTER_IP:8765/api/sync/koreader
+   http://YOUR_COMPUTER_IP:8765
    ```
 
-   Replace `YOUR_COMPUTER_IP` with your actual IP address
+   Use your server's LAN IP (or domain if you have one configured).
 
-3. **Set Custom Port** (if needed): Keep default or enter `8765`
+### Step 3: Approve the Device in Bookhoard
 
-### Step 3: Configure Authentication
+1. On your computer or phone, open Bookhoard and go to the **Devices** page (sidebar navigation)
+2. Refresh the page — your device appears under **Pending Device Registrations**
+3. Click **Approve** to connect the device
 
-1. **Authentication Method**: Select "Basic Auth"
-2. **Username**: Your Bookhoard email or username
-3. **Password**: Your Bookhoard password
+Once approved, the plugin picks up its credentials automatically — reading progress sync and OPDS catalog access are set up automatically. No further configuration is needed.
 
-### Step 4: Configure Sync Settings
+> **Note:** Pending registrations expire after 5 minutes. If yours expires, just re-run the sync from the plugin menu and approve again.
 
-1. **Auto Sync**: Enable for automatic sync
-2. **Sync Frequency**: Choose from:
-   - Every page turn (recommended for real-time sync)
-   - Every bookmark save
-   - Every highlight
-   - Manual only (sync when you press the sync button)
+### Auth Token (Advanced)
 
-3. **What to Sync**: Enable:
-   - ✅ Reading progress
-   - ✅ Bookmarks
-   - ✅ Highlights
-   - ✅ Notes
+The Devices page shows each KOReader device's **Auth Token**. You normally never need it (the plugin receives it automatically during approval), but it can be re-entered manually in the plugin settings if you're moving a setup between devices or debugging.
 
-### Step 5: Test Connection
+## What Syncs
 
-1. Tap **Test Connection** in the Calibre settings
-2. You should see a success message if configured correctly
-3. If it fails:
-   - Verify your device is connected to Wi-Fi
-   - Check the server URL is correct
-   - Ensure your Bookhoard instance is running
-   - Verify username and password are correct
+Once connected, the following sync automatically in both directions between KOReader and Bookhoard (web and other devices):
 
-## Using Sync Features
+- **Reading position** — percentage, chapter, and EPUB CFI where available
+- **Bookmarks**
+- **Highlights** — including highlight colors, mapped between the web and KOReader palettes
+- **Notes** — standalone and attached to highlights
 
-### Initial Sync
-
-When you first enable sync, KOReader will:
-
-1. Connect to Bookhoard
-2. Upload your current reading progress
-3. Download any annotations from the server
-4. Set up bidirectional sync for future changes
-
-### Reading Progress Sync
-
-As you read:
-
-- Progress updates automatically sync based on your sync frequency
-- Page turns, chapter changes, and bookmark saves all trigger sync
-- Sync occurs in the background without interrupting reading
-
-### Annotations Sync
-
-- **Bookmarks**: Sync when created or deleted
-- **Highlights**: Sync when created, edited, or deleted
-- **Notes**: Sync when created, edited, or deleted
-- **Linked Notes**: Notes attached to highlights sync together
-
-### Manual Sync
-
-To manually trigger a sync:
-
-1. Open the KOReader menu (≡)
-2. Select **Tools** → **Calibre**
-3. Tap **Sync Now**
-
-The sync status will display:
-
-- 🟢 **Synced** - All changes uploaded
-- 🟡 **Syncing...** - In progress
-- 🔴 **Failed** - Check your network connection
-
-## Advanced Configuration
-
-### Offline Mode
-
-KOReader automatically handles offline scenarios:
-
-1. Changes are queued locally when offline
-2. Auto-sync resumes when connected
-3. Queue processes all pending changes in priority order
-
-### Checkpoint Sync
-
-For better battery life, use checkpoint mode:
-
-1. In KOReader Calibre settings
-2. Set **Sync Mode** to "Checkpoint"
-3. Set **Checkpoint Interval** (e.g., every 5 minutes)
-4. Syncs occur in batches instead of every action
-
-### Debug Mode
-
-Enable debug logging if sync isn't working:
-
-1. KOReader menu → Tools → Calibre
-2. Enable **Debug Logging**
-3. Sync and check logs at `/mnt/us/koreader/calibre.log`
+Books are matched automatically using UUIDs, file hashes (SHA-256, format-aware so converted files still match), file aliases, and title/author fallback. If a book can't be matched, it shows up under the device's **Unlinked Books** in Bookhoard, where you can link it manually.
 
 ## OPDS Wireless Book Delivery
 
-### What is OPDS?
-
-OPDS (Open Publication Distribution System) allows your KOReader device to **wirelessly download books** from Bookhoard - no USB cable needed!
-
-### OPDS Benefits
-
-- **Wireless Downloads**: Browse and download books over Wi-Fi
-- **On-Demand Access**: Your entire library at your fingertips
-- **Collection Support**: Browse and download from specific collections
-- **Automatic Progress Sync**: Downloaded books sync progress instantly
-- **Format Support**: EPUB, KEPUB, PDF, and more
-
-### Enable OPDS in KOReader
-
-#### Step 1: Get Your OPDS URL
-
-1. Log in to Bookhoard web interface
-2. Go to **Device Management**
-3. Find your registered KOReader device
-4. Click **Show OPDS URL**
-5. Copy the URL (format: `http://YOUR_IP:8765/opds/devices/YOUR_DEVICE_ID/catalog`)
-
-#### Step 2: Add OPDS Catalog in KOReader
-
-1. Open KOReader on your device
-2. Tap the **+** (plus) button on the home screen
-3. Select **OPDS Catalog**
-4. Enter catalog details:
-   - **Name**: Bookhoard (or any name you prefer)
-   - **URL**: Paste your OPDS URL from Step 1
-5. Tap **Save**
-
-Your Bookhoard library now appears in KOReader's home screen!
+Once your device is approved, the plugin also registers Bookhoard's OPDS catalog, so you can browse and download books wirelessly — no USB cable needed.
 
 ### Browse and Download Books
 
-#### Browse Your Library
+1. In KOReader, open the OPDS catalog list and tap **Bookhoard**
+2. Browse your library: all books, collections, and recent additions
+3. Tap a book to see details and **Download** it
 
-1. Tap **Bookhoard** on KOReader home screen
-2. You'll see:
-   - **All Books**: Complete library view
-   - **Collections**: Books organized by collections
-   - **Recent**: Latest additions
-3. Tap any category to browse
-
-#### Download a Book
-
-1. Browse to find a book
-2. Tap the book to see details
-3. Tap **Download**
-4. Progress bar shows download status
-5. Book opens automatically when complete
-
-#### Download Entire Collections
-
-1. In Bookhoard catalog, tap **Collections**
-2. Select a collection
-3. Tap **Download All** to get all books
-4. Downloads queue and process in background
-
-### OPDS Features
-
-#### Supported Formats
-
-KOReader OPDS supports:
+### Supported Formats
 
 - **EPUB**: Standard ebook format
-- **KEPUB**: Kobo-optimized format (KOReader handles this well)
+- **KEPUB**: Kobo-optimized format
 - **PDF**: Fixed-layout documents
 - **CBZ**: Comic book archives
-- **TXT**: Plain text files
-- **RTF**: Rich text format
 
-#### Automatic Book Matching
-
-Books downloaded via OPDS are automatically matched:
-
-- Uses SHA-256 hashes for precise matching
-- Falls back to title/author matching
-- Links to your existing Bookhoard library
-- Progress syncs automatically
-
-#### Collection Integration
-
-Your Bookhoard collections appear in KOReader:
-
-- Collection **"To Read"** → KOReader category
-- Collection **"Science Fiction"** → Browseable section
-- Custom collections → Preserved organization
-
-### KOReader OPDS Settings
-
-#### Update Interval
-
-Configure how often KOReader checks for new books:
-
-1. KOReader menu → Tools → OPDS
-2. Set **Update Interval**: 5min, 15min, 1hr, manual
-3. **Recommended**: 15min for balance
-
-#### Download Location
-
-Choose where to store downloaded books:
-
-1. KOReader menu → File Browser
-2. Set **Default Download Folder**
-3. **Recommended**: `/mnt/us/Documents/` (Kindle) or `/mnt/onboard/Documents/` (Kobo)
-
-#### Auto-Download
-
-Automatically download new books from collections:
-
-1. KOReader menu → Tools → OPDS
-2. Enable **Auto-Download New Books**
-3. Select collections to monitor
-4. New books download automatically when connected to Wi-Fi
-
-### OPDS Troubleshooting
-
-#### Catalog Not Loading
-
-**Problem**: Bookhoard catalog shows error or won't load
-
-**Solutions**:
-
-1. Verify device is connected to Wi-Fi
-2. Check OPDS URL is correct in settings
-3. Try accessing OPDS URL in your browser
-4. Ensure Bookhoard server is running
-5. Check Bookhoard device is approved
-
-#### Download Fails
-
-**Problem**: Book download starts but fails
-
-**Solutions**:
-
-1. Check Wi-Fi signal strength
-2. Ensure sufficient storage on device
-3. Try downloading a smaller book
-4. Check Bookhoard has the book file
-5. Review Bookhoard logs for errors
-
-#### Book Opens But Progress Doesn't Sync
-
-**Problem**: Downloaded book doesn't sync progress
-
-**Solutions**:
-
-1. Verify book is matched to Bookhoard library
-2. Check device sync settings are enabled
-3. Try manual sync from device
-4. Ensure book exists in Bookhoard with same hash
-5. Check Bookhoard Progress page
-
-#### Slow Downloads
-
-**Problem**: Books take too long to download
-
-**Solutions**:
-
-1. Stay close to Wi-Fi router
-2. Use 5GHz Wi-Fi if available
-3. Close other apps using bandwidth
-4. Download smaller books first
-5. Consider USB for large books (100MB+)
-
-### Advanced OPDS Configuration
-
-#### Custom User-Agent
-
-Some OPDS catalogs require specific user agent:
-
-```lua
--- In KOReader settings
-OPDSUserAgent = "KOReader/2024.01"
-```
-
-#### Authentication Token
-
-If Bookhoard requires token authentication:
-
-1. Get token from Bookhoard device settings
-2. Add to OPDS URL: `?token=YOUR_TOKEN`
-3. KOReader includes token in all requests
-
-#### Compression
-
-Enable compression for faster downloads:
-
-```lua
--- In KOReader settings
-OPDSCompressionEnabled = true
-```
-
-### OPDS vs USB Transfer
-
-| Feature           | OPDS (Wireless)               | USB Transfer            |
-| ----------------- | ----------------------------- | ----------------------- |
-| **Convenience**   | ⭐⭐⭐⭐⭐ No cable needed    | ⭐⭐ Requires cable     |
-| **Speed**         | ⭐⭐⭐ Fast (Wi-Fi dependent) | ⭐⭐⭐⭐⭐ Very fast    |
-| **Bulk Transfer** | ⭐⭐⭐ One at a time          | ⭐⭐⭐⭐⭐ Many at once |
-| **Progress Sync** | ⭐⭐⭐⭐⭐ Instant            | ⭐⭐⭐⭐ After transfer |
-| **Accessibility** | ⭐⭐⭐⭐⭐ Anywhere           | ⭐⭐ At computer only   |
-| **Reliability**   | ⭐⭐⭐⭐ Very good            | ⭐⭐⭐⭐⭐ Excellent    |
-
-**Recommendation**: Use OPDS for daily reading (convenience), USB for bulk library transfers.
-
-### OPDS Tips and Tricks
-
-1. **Favorite Collections**: Pin frequently-used collections to home screen
-2. **Batch Downloads**: Start multiple downloads before leaving Wi-Fi
-3. **Download Queue**: Downloads continue in background while reading
-4. **Storage Management**: Check free space before downloading large collections
-5. **Network Speed**: Use 5GHz Wi-Fi for faster downloads if available
+Books downloaded via OPDS are automatically matched to your library, so their progress syncs from the first page.
 
 ## Troubleshooting
 
+### Pending Registration Never Appears
+
+**Problem**: You entered the Server URL, but no pending registration shows in Bookhoard
+
+**Solutions**:
+
+1. Verify the Server URL is correct (no trailing path — just the base address)
+2. Make sure KOReader is connected to Wi-Fi
+3. Check the Bookhoard server is reachable from the device's network
+4. Registrations expire after 5 minutes — re-run the sync and approve quickly
+
 ### Connection Refused
 
-**Problem**: "Connection refused" error
+**Problem**: "Connection refused" error on the device
 
 **Solutions**:
 
-- Verify Bookhoard is running on your computer
-- Check the server URL and port (8765)
-- Ensure device is on same Wi-Fi network
-- Try using your computer's IP address instead of "localhost"
+- Verify Bookhoard is running
+- Check the server address and port (default `8765`)
+- Ensure the device is on the same Wi-Fi network as the server
+- Use the server's LAN IP instead of `localhost`
 
-### Authentication Failed
+### Sync Not Working After Approval
 
-**Problem**: "Authentication failed" error
+**Problem**: Device shows as approved but changes don't appear in Bookhoard
 
 **Solutions**:
 
-- Verify username and password
-- Check your account is active and not locked
-- Try logging in to Bookhoard web interface first
-- Reset password if needed
-
-### Sync Not Working
-
-**Problem**: Changes not appearing in Bookhoard
-
-**Solutions**:
-
-- Enable debug logging in KOReader
-- Check Bookhoard Device Management page for errors
-- Verify sync is enabled in KOReader settings
-- Try manual sync to trigger immediate update
-- Check Bookhoard logs for sync errors
+- Trigger a manual sync from the plugin menu
+- Check the device shows as enabled on the **Devices** page (open its settings from the icon next to the device)
+- Verify the book appears as an unlinked book for the device and link it if needed
+- Check Bookhoard server logs for errors
 
 ### Conflicts Detected
 
-**Problem**: Sync conflicts when reading on multiple devices
+**Problem**: Sync conflicts when reading the same book on multiple devices
 
 **Solutions**:
 
-1. Go to Bookhoard **Conflicts** page
-2. Review conflicting progress from each device
+1. Open the book's detail page and click **Sync Progress**, or open the Conflicts page (`/conflicts`)
+2. Review the progress reported by each device
 3. Choose which device's progress to keep
-4. Set auto-resolution preference for future conflicts
-
-### Large Files Not Syncing
-
-**Problem**: Large annotations or highlights fail to sync
-
-**Solutions**:
-
-- Check Bookhoard sync queue for stuck items
-- Increase sync timeout in KOReader settings
-- Break up large highlights into smaller segments
-- Verify network bandwidth is sufficient
 
 ## Security Best Practices
 
-1. **Use HTTPS**: If deploying Bookhoard publicly, configure SSL/TLS
-2. **Strong Password**: Use a secure password for your Bookhoard account
-3. **Network Security**: Ensure your Wi-Fi network is secure (WPA2/WPA3)
-4. **Device Authorization**: Only approve devices you recognize
-5. **Regular Updates**: Keep KOReader updated to the latest version
+1. **Use HTTPS**: If exposing Bookhoard beyond your LAN, configure SSL/TLS
+2. **Network Security**: Ensure your Wi-Fi network is secure (WPA2/WPA3)
+3. **Device Authorization**: Only approve pending registrations you initiated
+4. **Revoke lost devices**: Remove devices you no longer use from the Devices page
 
 ## Additional Resources
 
 - [KOReader Documentation](https://github.com/koreader/koreader)
 - [KOReader Forum](https://www.mobileread.com/forums/forumdisplay.php?f=271)
 - [Bookhoard Universal Sync Guide](../sync-guide.md)
-- [Kobo Setup Guide](kobo-setup.md)
-
-## Support
-
-If you encounter issues:
-
-1. Check the troubleshooting section above
-2. Enable debug logging and review KOReader logs
-3. Check Bookhoard sync queue and device management pages
-4. Open an issue on the Bookhoard GitHub repository
+- [Bookhoard KOReader Plugin](https://git.linuxhg.com/Bookhoard/bookhoard.koplugin)
 
 ---
 
-**Last Updated**: 2026-01-31  
-**Bookhoard Version**: 1.0  
-**KOReader Version**: 2024.01+
+**Last Updated**: August 2026
+**Bookhoard Version**: 1.0

docs/user/library-browsing.md

@@ -1,60 +1,58 @@
-## Saving Custom Filters
+# Saving Custom Filters
 
-The bookshelf page allows you to save custom filter presets for quick access.
+The bookshelf (**All Books**) page lets you save custom filter presets for quick access.
 
-### How to Save a Filter
+## Bookshelf Toolbar
+
+The All Books page has a toolbar with:
+
+- A **search input** for quick text searches
+- A **sort** dropdown (title, author, date added, page count)
+- A **Filters** button that opens the filter drawer (author, tags, series, and more)
+- **Save**, **Load**, and **Clear** buttons for filter presets
+
+## How to Save a Filter
 
 1. Navigate to the **All Books** page
-2. Set your desired filters (genre, author, series, etc.)
-3. Click the **💾 Save Filter** button
+2. Click **Filters** to open the drawer, set your desired filters, and click **Apply Filters**
+3. Click the **Save** button in the toolbar
 4. Enter a name for your filter (e.g., "My Sci-Fi Books")
 5. Click **Save**
 
-### Loading Saved Filters
+## Loading Saved Filters
 
-After saving filters, you can quickly load them from the saved filters dropdown:
+1. Click the **Load** button to open the **Saved Filters** dropdown
+2. Click a filter's name to apply it
+3. The filter values are applied instantly, without a page reload
 
-1. Click the **📋 Saved Filters** button (next to the Save Filter button)
-2. Select a filter from the dropdown list
-3. The filter values are automatically applied to the form
-4. Your books are instantly filtered to show matching results
+## Managing Saved Filters
 
-**Tips:**
-- Saved filters appear in the dropdown with their names
-- Hover over a filter to see a delete button (🗑️)
-- Click a filter name to apply it instantly
-- Filters are applied without page reload (instant feedback)
+**Delete a filter:**
 
-### Managing Saved Filters
-
-**View Saved Filters:**
-- Saved filters are displayed in the dropdown
-- Each filter shows its name (e.g., "My Sci-Fi Books")
-
-**Delete a Filter:**
-1. Click the **📋 Saved Filters** button
-2. Hover over the filter you want to delete
-3. Click the **🗑️** delete button
-4. Confirm deletion
-5. The filter is removed from your list
+1. Click the **Load** button to open the **Saved Filters** dropdown
+2. Click the trash icon next to the filter you want to remove
+3. Confirm deletion
 
 **Filter Privacy:**
 
 Saved filters are **private to your account**. Other users cannot see or modify your filters.
 
-### Common Use Cases
+## Common Use Cases
 
 **Reading by Genre:**
-1. Filter by genre: "Science Fiction"
+
+1. Filter by tag: "Science Fiction"
 2. Save as "Sci-Fi Books"
 3. Quickly access all your sci-fi collection anytime
 
 **Author Collections:**
+
 1. Filter by author: "Isaac Asimov"
 2. Save as "Asimov Books"
 3. Switch between different author collections instantly
 
 **Series Tracking:**
+
 1. Filter by series: "Foundation"
 2. Save as "Foundation Series"
 3. Track your progress through a series

docs/user/profile-guide.md

@@ -6,10 +6,10 @@ Your profile contains your account information and preferences.
 
 ### How to Update
 
-1. Click on your **username** (top-right)
-2. Select **Profile** from the dropdown
+1. Click on your **username** at the bottom of the sidebar to expand the account menu
+2. Select **Profile**
 3. Edit any fields in the "Account Information" section
-4. Click **Update Profile**
+4. Click **Save Changes**
 5. Changes take effect immediately
 
 ### Fields You Can Update
@@ -65,7 +65,7 @@ When you delete your account:
 1. Go to **Profile** page
 2. Scroll to "Danger Zone" (bottom of page)
 3. Click **Remove My Account**
-4. Confirm by clicking "OK" in the popup
+4. Confirm the deletion prompt
 
 **Note:** If you're the last admin, you cannot delete your account for security reasons.
 
@@ -75,10 +75,12 @@ Personalize your reading experience with different color themes.
 
 ### Quick Theme Switch
 
-1. Click the **paintbrush icon** (top-right, next to your username)
-2. Select a theme from the dropdown
+1. In the sidebar, open the **Appearance** panel (palette icon, near the bottom)
+2. Select a theme from the list; your active theme is marked with a checkmark
 3. Changes apply instantly
 
+For the full theme list and bookshelf background (wood) options, see [Themes and Wood Paneling](themes.md).
+
 ### Available Themes
 
 - **Tokyo Night** (default) - Blue/purple accents
@@ -88,9 +90,7 @@ Personalize your reading experience with different color themes.
 - **Monokai** - Classic vibrant colors
 - **One Dark Pro** - Atom editor inspired
 - **Material Dark** - Google Material Design
-- **Wood Light** - Light wood texture
-- **Wood Dark** - Dark wood texture
-- **Wood Mahogany** - Reddish-brown wood
+- **Catppuccin Mocha / Macchiato / Frappé / Latte** - Soothing pastel palettes (Latte is light)
 
 ## For Admin Users
 

docs/user/searching-and-filtering.md

@@ -13,10 +13,11 @@ Tags are keywords or categories assigned to books, such as:
 
 ### Filtering by Tags
 
-1. Navigate to the **Bookshelf** page
-2. Use the **Tags** filter input
-3. Start typing to see autocomplete suggestions
-4. Select a tag or press Enter to filter
+1. Navigate to the **All Books** page
+2. Click **Filters** in the toolbar to open the filter drawer
+3. Use the **Tags** filter input
+4. Start typing to see autocomplete suggestions
+5. Select a tag or press Enter, then click **Apply Filters**
 
 **Example:** Typing "Sci" will suggest "Science Fiction"
 

docs/user/sync-guide.md

@@ -21,7 +21,7 @@
 
 🔄 **Automatic Sync** - Your reading progress syncs automatically when you turn pages
 
-📱 **Multi-Platform** - Works with web browsers, KOReader, Kobo devices, and mobile apps
+📱 **Multi-Platform** - Works with web browsers and KOReader, with native Kobo sync and mobile apps on the roadmap
 
 📍 **Precise Location Tracking** - Supports EPUB CFI, page numbers, percentages, and character offsets
 
@@ -37,19 +37,24 @@
 
 ### Currently Supported ✅
 
-| Platform         | Status             | Sync Method                 | Notes                          |
-| ---------------- | ------------------ | --------------------------- | ------------------------------ |
-| **Web Browser**  | ✅ Fully Supported | Real-time WebSocket         | Any modern browser             |
-| **KOReader**     | ✅ Fully Supported | Wi-Fi (Calibre-compatible)  | Kindle, Kobo, PocketBook, etc. |
-| **Kobo Devices** | ✅ Fully Supported | Wi-Fi (Kobo API-compatible) | Clara, Libra, Sage, etc.       |
+| Platform         | Status             | Sync Method                 | Notes                              |
+| ---------------- | ------------------ | --------------------------- | ---------------------------------- |
+| **Web Browser**  | ✅ Fully Supported | Real-time WebSocket         | Any modern browser                 |
+| **KOReader**     | ✅ Fully Supported | Wi-Fi (Bookhoard plugin)    | Kindle, Kobo, PocketBook hardware  |
 
 ### Coming Soon 🚧
 
-| Platform              | Expected Release |
-| --------------------- | ---------------- |
-| **Mobile Apps**       | Q2 2026          |
-| **Kindle Devices**    | Q3 2026          |
-| **Remarkable Tablet** | Q4 2026          |
+| Platform              | Status                                                        |
+| --------------------- | ------------------------------------------------------------- |
+| **Kobo Devices**      | Native sync coming soon — use KOReader on Kobo hardware today |
+| **Mobile Apps**       | Android/iOS apps coming later                                 |
+
+### On the Roadmap 🔭
+
+| Platform              | Status                                   |
+| --------------------- | ---------------------------------------- |
+| **Kindle Devices**    | Under consideration (no date yet)        |
+| **Remarkable Tablet** | Under consideration (no date yet)        |
 
 ---
 
@@ -74,22 +79,21 @@
 
 For detailed device configuration instructions, see the appropriate setup guide:
 
-- **[Kobo Setup Guide](devices/kobo-setup.md)** - Kobo e-reader configuration
-- **[KOReader Setup Guide](devices/koreader-setup.md)** - KOReader configuration
+- **[KOReader Setup Guide](devices/koreader-setup.md)** - KOReader configuration (Kindle, Kobo, and PocketBook hardware)
+- **[Kobo Setup Guide](devices/kobo-setup.md)** - Native Kobo sync (coming soon; use KOReader today)
 
 ### Quick Overview
 
-**Registration Process**:
+**Registration Process** (KOReader):
 
-1. Register device in Bookhoard web interface (Settings → Devices)
-2. Approve device via QR code or approval URL
-3. Configure sync settings on your device
-4. Start reading - progress syncs automatically!
+1. Install the Bookhoard plugin and enter your server URL in KOReader
+2. Approve the pending registration on the Bookhoard **Devices** page (sidebar navigation)
+3. That's it — sync starts automatically once approved
 
 **Device Management**:
 
 ```
-Settings → Devices
+Devices page (sidebar navigation)
 ```
 
 You can:
@@ -124,7 +128,7 @@ Sometimes a book on your device can't be automatically matched to your library.
 ### Viewing Unlinked Books
 
 ```
-Settings → Devices → Select Device → View Unlinked Books
+Devices page → select device → unlinked books
 ```
 
 ### Resolving Unlinked Books
@@ -284,7 +288,7 @@ This ensures your highlights work across all devices, even with different page c
 
 **Solutions**:
 
-1. Check device is online: `Settings → Devices`
+1. Check device is online: Devices page (sidebar navigation)
 2. Verify sync is enabled for the device
 3. Check sync URL is correct
 4. Ensure device has network connection
@@ -318,7 +322,7 @@ This ensures your highlights work across all devices, even with different page c
 
 **Solutions**:
 
-1. Go to `Settings → Conflicts`
+1. Open the book's detail page and click **Sync Progress**, or go to the Conflicts page (`/conflicts`)
 2. Review both device progress
 3. Choose which device's progress to keep
 4. Or choose "Merge" (keeps furthest progress)
@@ -331,7 +335,7 @@ This ensures your highlights work across all devices, even with different page c
 
 1. Switch to checkpoint mode
 2. Increase sync interval
-3. Use Wi-Fi instead of cellular (for mobile)
+3. Sync less frequently
 
 ---
 
@@ -341,7 +345,7 @@ This ensures your highlights work across all devices, even with different page c
 
 ✅ **DO**:
 
-- Use checkpoint mode when on cellular data
+- Use checkpoint mode when on slow connections
 - Keep device firmware updated
 - Use Wi-Fi when available
 - Approve only devices you own
@@ -369,7 +373,7 @@ This ensures your highlights work across all devices, even with different page c
 
 - **Primary Device**: KOReader on e-reader
 - **Secondary Device**: Web browser (work/home)
-- **Mobile Device**: Phone app (commute)
+- **On the go**: Web browser on a phone (dedicated mobile apps coming later)
 
 **Sync Strategy**:
 
@@ -393,7 +397,7 @@ This ensures your highlights work across all devices, even with different page c
 **Manual Resolution**:
 
 ```
-Settings → Conflicts → Select conflict → Choose winner
+Book detail → Sync Progress → choose winner
 ```
 
 **Options**:
@@ -408,7 +412,7 @@ Settings → Conflicts → Select conflict → Choose winner
 **View Queue Status**:
 
 ```
-Settings → Devices → Select Device → View Queue
+Devices page → sync queue section
 ```
 
 **Queue Stats**:
@@ -436,7 +440,7 @@ Settings → Devices → Select Device → View Queue
 **View History**:
 
 ```
-Book → Reading History
+Progress page (sidebar navigation), or the book's detail page
 ```
 
 **Privacy**:
@@ -503,9 +507,8 @@ Book → Reading History
 ### For Better Battery Life
 
 1. **Checkpoint mode** - Fewer sync requests
-2. **Wi-Fi only** - Disable cellular
-3. **Increase sync interval** - Fewer updates
-4. **Close when not reading** - Reduces background activity
+2. **Increase sync interval** - Fewer updates
+3. **Close when not reading** - Reduces background activity
 
 ---
 
@@ -523,7 +526,7 @@ A: No, devices are tied to individual accounts for security.
 A: All sync data for that book is removed from the server.
 
 **Q: Can I export my reading data?**
-A: Yes! Settings → Export → Download sync data.
+A: Reading data isn't exportable from the UI yet — it's accessible via the API.
 
 **Q: Does sync work over the internet?**
 A: Yes, if your server is publicly accessible with HTTPS.
@@ -537,7 +540,7 @@ A: Approximately 1KB per page turn, 50KB per annotation.
 A: Uses percentage and EPUB CFI for universal positioning.
 
 **Q: Can I sync with Calibre anymore?**
-A: Yes! KOReader sync is Calibre-compatible.
+A: Bookhoard's KOReader sync uses a dedicated plugin (server-side approval, device tokens) — no Calibre involvement required.
 
 **Q: What if I lose my device?**
 A: Revoke it in settings and register a new one.
@@ -571,18 +574,18 @@ A: Yes, HTTPS/TLS 1.3 for all sync traffic.
 
 ## Changelog
 
-### Version 1.0.0 (January 2026)
+### Version 1.0.x (2026)
 
-- ✅ Initial release
-- ✅ KOReader sync support
-- ✅ Kobo device support
 - ✅ Web sync support
+- ✅ KOReader sync (progress, bookmarks, highlights, notes)
 - ✅ Conflict resolution
 - ✅ Offline queue
 - ✅ Real-time WebSocket sync
+- 🚧 Native Kobo sync (coming soon)
+- 🚧 Mobile apps (coming later)
 
 ---
 
-**Last Updated**: January 31, 2026  
-**Version**: 1.0.0  
-**License**: MIT
+**Last Updated**: August 2026  
+**Version**: 1.0  
+**License**: AGPL-3.0

docs/user/themes.md

@@ -18,10 +18,12 @@ Bookhoard includes multiple color themes to suit your preferences:
 
 ### Changing Your Theme
 
-1. Click the theme icon (palette) in the header
-2. Select your preferred color theme
+1. In the sidebar, open the **Appearance** panel (palette icon, near the bottom)
+2. Pick a theme from the list — each option shows its color swatch, and your active theme is marked with a checkmark
 3. Your choice is saved automatically and synced across devices
 
+On small screens, open the sidebar with the menu button in the top bar first.
+
 ## Wood Paneling
 
 Wood paneling adds texture to your dashboard bookshelf background, giving it a classic bookshelf feel.
@@ -35,10 +37,10 @@ Wood paneling adds texture to your dashboard bookshelf background, giving it a c
 
 ### Applying Wood Paneling
 
-1. Click the theme icon (palette) in the header
-2. Scroll to "Bookshelf Background" section
-3. Select your preferred wood texture
-4. Texture is applied to dashboard bookshelf only
+1. In the sidebar, open the **Appearance** panel (palette icon, near the bottom)
+2. Scroll to the **Bookshelf** section below the theme list
+3. Select your preferred wood texture (each option shows a texture swatch; **None** is the default)
+4. Texture is applied to the dashboard bookshelf background
 
 **Note:** Wood paneling is a browser preference and is not synced across devices.
 

docs/user/user-guide.md

@@ -6,18 +6,16 @@ Welcome to the Bookhoard user documentation. This section contains guides for us
 
 Learn how to configure your e-reader devices to sync with Bookhoard:
 
-- **[Kobo Setup Guide](devices/kobo-setup.md)** - Complete guide for Kobo e-readers
-  - Device registration
-  - Sync configuration
-  - OPDS wireless book delivery
-  - Troubleshooting
-
 - **[KOReader Setup Guide](devices/koreader-setup.md)** - Complete guide for KOReader
   - Installation on Kindle/Kobo/PocketBook
-  - Sync setup
+  - Plugin setup with server-side device approval
+  - Progress, bookmark, highlight, and note sync
   - OPDS catalog access
   - Troubleshooting
 
+- **[Kobo Setup Guide](devices/kobo-setup.md)** - Native Kobo sync (coming soon)
+  - In the meantime, KOReader works great on Kobo hardware
+
 ## 🔄 Sync Configuration
 
 - **[Universal Sync Guide](sync-guide.md)** - Understanding and using sync features

internal/database/querier.go

@@ -327,6 +327,14 @@ type Querier interface {
 	ListAllConflictsByUserAndStatus(ctx context.Context, arg ListAllConflictsByUserAndStatusParams) ([]ListAllConflictsByUserAndStatusRow, error)
 	ListAllSyncQueueItems(ctx context.Context, arg ListAllSyncQueueItemsParams) ([]ListAllSyncQueueItemsRow, error)
 	ListConflictsByUser(ctx context.Context, userID pgtype.UUID) ([]ListConflictsByUserRow, error)
+	// ============================================
+	// ANNOTATION HISTORY (deleted-annotation archive)
+	// ============================================
+	// Lists every currently-tombstoned annotation for a book regardless of the
+	// tombstone TTL: this backs the book page's "recently deleted" history where
+	// users can restore or permanently remove entries. Rows whose tombstones have
+	// been purged by the daily maintenance sweep no longer exist at all.
+	ListDeletedAnnotationsForBook(ctx context.Context, arg ListDeletedAnnotationsForBookParams) ([]ListDeletedAnnotationsForBookRow, error)
 	ListDevicesByType(ctx context.Context, deviceType string) ([]Devices, error)
 	ListDevicesByUser(ctx context.Context, userID pgtype.UUID) ([]Devices, error)
 	ListLibraries(ctx context.Context) ([]ListLibrariesRow, error)
@@ -348,6 +356,11 @@ type Querier interface {
 	PurgeExpiredBookmarkTombstones(ctx context.Context, deletedAt pgtype.Timestamptz) error
 	PurgeExpiredHighlightTombstones(ctx context.Context, deletedAt pgtype.Timestamptz) error
 	PurgeExpiredNoteTombstones(ctx context.Context, deletedAt pgtype.Timestamptz) error
+	PurgeMediaBookmarkByID(ctx context.Context, arg PurgeMediaBookmarkByIDParams) (int64, error)
+	// Permanent removal from the history (distinct from the TTL-driven purge,
+	// which is maintenance). Scoped to the owning user and book.
+	PurgeMediaHighlightByID(ctx context.Context, arg PurgeMediaHighlightByIDParams) (int64, error)
+	PurgeMediaNoteByID(ctx context.Context, arg PurgeMediaNoteByIDParams) (int64, error)
 	// Query media items by multiple identifiers with confidence scoring
 	QueryMediaItemsByIdentifiers(ctx context.Context, arg QueryMediaItemsByIdentifiersParams) ([]QueryMediaItemsByIdentifiersRow, error)
 	ReassignLibraries(ctx context.Context, arg ReassignLibrariesParams) error
@@ -363,6 +376,9 @@ type Querier interface {
 	ResolveSyncConflict(ctx context.Context, arg ResolveSyncConflictParams) (SyncConflicts, error)
 	// Resolve unlinked book
 	ResolveUnlinkedBook(ctx context.Context, arg ResolveUnlinkedBookParams) (UnlinkedBooks, error)
+	RestoreMediaBookmarkByID(ctx context.Context, arg RestoreMediaBookmarkByIDParams) (int64, error)
+	RestoreMediaHighlightByID(ctx context.Context, arg RestoreMediaHighlightByIDParams) (int64, error)
+	RestoreMediaNoteByID(ctx context.Context, arg RestoreMediaNoteByIDParams) (int64, error)
 	RevokeAllUserRefreshTokens(ctx context.Context, userID pgtype.UUID) error
 	RevokeDevice(ctx context.Context, id pgtype.UUID) error
 	// Revoke OPDS token

internal/database/queries.sql.go

@@ -6852,7 +6852,11 @@ SELECT
     mh.dedup_key,
     'highlight' as annotation_type,
     mh.device_sync_data,
-    mh.deleted_at
+    mh.deleted_at,
+    mh.start_position,
+    mh.end_position,
+    mh.epubcfi_start,
+    mh.epubcfi_end
 FROM media_highlights mh
 WHERE mh.media_item_id = $1 AND mh.user_id = $2 AND mh.deleted = TRUE AND mh.deleted_at > $3
 UNION ALL
@@ -6861,7 +6865,11 @@ SELECT
     mn.dedup_key,
     'note' as annotation_type,
     mn.device_sync_data,
-    mn.deleted_at
+    mn.deleted_at,
+    mn.position as start_position,
+    NULL as end_position,
+    mn.epubcfi_location as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_notes mn
 WHERE mn.media_item_id = $1 AND mn.user_id = $2 AND mn.deleted = TRUE AND mn.deleted_at > $3
 UNION ALL
@@ -6870,7 +6878,11 @@ SELECT
     mb.dedup_key,
     'bookmark' as annotation_type,
     mb.device_sync_data,
-    mb.deleted_at
+    mb.deleted_at,
+    mb.position as start_position,
+    NULL as end_position,
+    mb.cfi_position as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_bookmarks mb
 WHERE mb.media_item_id = $1 AND mb.user_id = $2 AND mb.deleted = TRUE AND mb.deleted_at > $3
 ORDER BY deleted_at DESC
@@ -6888,6 +6900,10 @@ type GetTombstonedAnnotationsForBookRow struct {
 	AnnotationType string             `db:"annotation_type" json:"annotation_type"`
 	DeviceSyncData []byte             `db:"device_sync_data" json:"device_sync_data"`
 	DeletedAt      pgtype.Timestamptz `db:"deleted_at" json:"deleted_at"`
+	StartPosition  pgtype.Text        `db:"start_position" json:"start_position"`
+	EndPosition    pgtype.Text        `db:"end_position" json:"end_position"`
+	EpubcfiStart   pgtype.Text        `db:"epubcfi_start" json:"epubcfi_start"`
+	EpubcfiEnd     pgtype.Text        `db:"epubcfi_end" json:"epubcfi_end"`
 }
 
 func (q *Queries) GetTombstonedAnnotationsForBook(ctx context.Context, arg GetTombstonedAnnotationsForBookParams) ([]GetTombstonedAnnotationsForBookRow, error) {
@@ -6905,6 +6921,10 @@ func (q *Queries) GetTombstonedAnnotationsForBook(ctx context.Context, arg GetTo
 			&i.AnnotationType,
 			&i.DeviceSyncData,
 			&i.DeletedAt,
+			&i.StartPosition,
+			&i.EndPosition,
+			&i.EpubcfiStart,
+			&i.EpubcfiEnd,
 		); err != nil {
 			return nil, err
 		}
@@ -8107,6 +8127,98 @@ func (q *Queries) ListConflictsByUser(ctx context.Context, userID pgtype.UUID) (
 	return items, nil
 }
 
+const ListDeletedAnnotationsForBook = `-- name: ListDeletedAnnotationsForBook :many
+
+SELECT
+    mh.id,
+    mh.dedup_key,
+    'highlight' as annotation_type,
+    mh.selection_text as display_text,
+    mh.note_text as secondary_text,
+    mh.color,
+    mh.deleted_at,
+    mh.created_at
+FROM media_highlights mh
+WHERE mh.media_item_id = $1 AND mh.user_id = $2 AND mh.deleted = TRUE
+UNION ALL
+SELECT
+    mn.id,
+    mn.dedup_key,
+    'note' as annotation_type,
+    mn.content as display_text,
+    NULL::text as secondary_text,
+    NULL::text as color,
+    mn.deleted_at,
+    mn.created_at
+FROM media_notes mn
+WHERE mn.media_item_id = $1 AND mn.user_id = $2 AND mn.deleted = TRUE
+UNION ALL
+SELECT
+    mb.id,
+    mb.dedup_key,
+    'bookmark' as annotation_type,
+    mb.title as display_text,
+    mb.notes as secondary_text,
+    NULL::text as color,
+    mb.deleted_at,
+    mb.created_at
+FROM media_bookmarks mb
+WHERE mb.media_item_id = $1 AND mb.user_id = $2 AND mb.deleted = TRUE
+ORDER BY deleted_at DESC
+`
+
+type ListDeletedAnnotationsForBookParams struct {
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+}
+
+type ListDeletedAnnotationsForBookRow struct {
+	ID             pgtype.UUID        `db:"id" json:"id"`
+	DedupKey       pgtype.Text        `db:"dedup_key" json:"dedup_key"`
+	AnnotationType string             `db:"annotation_type" json:"annotation_type"`
+	DisplayText    string             `db:"display_text" json:"display_text"`
+	SecondaryText  pgtype.Text        `db:"secondary_text" json:"secondary_text"`
+	Color          pgtype.Text        `db:"color" json:"color"`
+	DeletedAt      pgtype.Timestamptz `db:"deleted_at" json:"deleted_at"`
+	CreatedAt      pgtype.Timestamptz `db:"created_at" json:"created_at"`
+}
+
+// ============================================
+// ANNOTATION HISTORY (deleted-annotation archive)
+// ============================================
+// Lists every currently-tombstoned annotation for a book regardless of the
+// tombstone TTL: this backs the book page's "recently deleted" history where
+// users can restore or permanently remove entries. Rows whose tombstones have
+// been purged by the daily maintenance sweep no longer exist at all.
+func (q *Queries) ListDeletedAnnotationsForBook(ctx context.Context, arg ListDeletedAnnotationsForBookParams) ([]ListDeletedAnnotationsForBookRow, error) {
+	rows, err := q.db.Query(ctx, ListDeletedAnnotationsForBook, arg.MediaItemID, arg.UserID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []ListDeletedAnnotationsForBookRow{}
+	for rows.Next() {
+		var i ListDeletedAnnotationsForBookRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.DedupKey,
+			&i.AnnotationType,
+			&i.DisplayText,
+			&i.SecondaryText,
+			&i.Color,
+			&i.DeletedAt,
+			&i.CreatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const ListDevicesByType = `-- name: ListDevicesByType :many
 SELECT id, user_id, device_name, device_type, device_identifier, auth_token, last_sync, last_seen, sync_enabled, auto_sync, sync_frequency_minutes, device_metadata, created_at, updated_at FROM devices WHERE device_type = $1 ORDER BY created_at DESC
 `
@@ -9399,6 +9511,65 @@ func (q *Queries) PurgeExpiredNoteTombstones(ctx context.Context, deletedAt pgty
 	return err
 }
 
+const PurgeMediaBookmarkByID = `-- name: PurgeMediaBookmarkByID :execrows
+DELETE FROM media_bookmarks
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type PurgeMediaBookmarkByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+func (q *Queries) PurgeMediaBookmarkByID(ctx context.Context, arg PurgeMediaBookmarkByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, PurgeMediaBookmarkByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
+const PurgeMediaHighlightByID = `-- name: PurgeMediaHighlightByID :execrows
+DELETE FROM media_highlights
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type PurgeMediaHighlightByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+// Permanent removal from the history (distinct from the TTL-driven purge,
+// which is maintenance). Scoped to the owning user and book.
+func (q *Queries) PurgeMediaHighlightByID(ctx context.Context, arg PurgeMediaHighlightByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, PurgeMediaHighlightByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
+const PurgeMediaNoteByID = `-- name: PurgeMediaNoteByID :execrows
+DELETE FROM media_notes
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type PurgeMediaNoteByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+func (q *Queries) PurgeMediaNoteByID(ctx context.Context, arg PurgeMediaNoteByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, PurgeMediaNoteByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
 const QueryMediaItemsByIdentifiers = `-- name: QueryMediaItemsByIdentifiers :many
 SELECT
     mi.id,
@@ -9732,6 +9903,72 @@ func (q *Queries) ResolveUnlinkedBook(ctx context.Context, arg ResolveUnlinkedBo
 	return i, err
 }
 
+const RestoreMediaBookmarkByID = `-- name: RestoreMediaBookmarkByID :execrows
+UPDATE media_bookmarks SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type RestoreMediaBookmarkByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+func (q *Queries) RestoreMediaBookmarkByID(ctx context.Context, arg RestoreMediaBookmarkByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, RestoreMediaBookmarkByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
+const RestoreMediaHighlightByID = `-- name: RestoreMediaHighlightByID :execrows
+UPDATE media_highlights SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type RestoreMediaHighlightByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+func (q *Queries) RestoreMediaHighlightByID(ctx context.Context, arg RestoreMediaHighlightByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, RestoreMediaHighlightByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
+const RestoreMediaNoteByID = `-- name: RestoreMediaNoteByID :execrows
+UPDATE media_notes SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE
+`
+
+type RestoreMediaNoteByIDParams struct {
+	ID          pgtype.UUID `db:"id" json:"id"`
+	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
+	MediaItemID pgtype.UUID `db:"media_item_id" json:"media_item_id"`
+}
+
+func (q *Queries) RestoreMediaNoteByID(ctx context.Context, arg RestoreMediaNoteByIDParams) (int64, error) {
+	result, err := q.db.Exec(ctx, RestoreMediaNoteByID, arg.ID, arg.UserID, arg.MediaItemID)
+	if err != nil {
+		return 0, err
+	}
+	return result.RowsAffected(), nil
+}
+
 const RevokeAllUserRefreshTokens = `-- name: RevokeAllUserRefreshTokens :exec
 UPDATE refresh_tokens SET revoked_at = NOW() WHERE user_id = $1 AND revoked_at IS NULL
 `

internal/database/queries/queries.sql

@@ -992,7 +992,11 @@ SELECT
     mh.dedup_key,
     'highlight' as annotation_type,
     mh.device_sync_data,
-    mh.deleted_at
+    mh.deleted_at,
+    mh.start_position,
+    mh.end_position,
+    mh.epubcfi_start,
+    mh.epubcfi_end
 FROM media_highlights mh
 WHERE mh.media_item_id = $1 AND mh.user_id = $2 AND mh.deleted = TRUE AND mh.deleted_at > $3
 UNION ALL
@@ -1001,7 +1005,11 @@ SELECT
     mn.dedup_key,
     'note' as annotation_type,
     mn.device_sync_data,
-    mn.deleted_at
+    mn.deleted_at,
+    mn.position as start_position,
+    NULL as end_position,
+    mn.epubcfi_location as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_notes mn
 WHERE mn.media_item_id = $1 AND mn.user_id = $2 AND mn.deleted = TRUE AND mn.deleted_at > $3
 UNION ALL
@@ -1010,11 +1018,96 @@ SELECT
     mb.dedup_key,
     'bookmark' as annotation_type,
     mb.device_sync_data,
-    mb.deleted_at
+    mb.deleted_at,
+    mb.position as start_position,
+    NULL as end_position,
+    mb.cfi_position as epubcfi_start,
+    NULL as epubcfi_end
 FROM media_bookmarks mb
 WHERE mb.media_item_id = $1 AND mb.user_id = $2 AND mb.deleted = TRUE AND mb.deleted_at > $3
 ORDER BY deleted_at DESC;
 
+-- ============================================
+-- ANNOTATION HISTORY (deleted-annotation archive)
+-- ============================================
+
+-- Lists every currently-tombstoned annotation for a book regardless of the
+-- tombstone TTL: this backs the book page's "recently deleted" history where
+-- users can restore or permanently remove entries. Rows whose tombstones have
+-- been purged by the daily maintenance sweep no longer exist at all.
+-- name: ListDeletedAnnotationsForBook :many
+SELECT
+    mh.id,
+    mh.dedup_key,
+    'highlight' as annotation_type,
+    mh.selection_text as display_text,
+    mh.note_text as secondary_text,
+    mh.color,
+    mh.deleted_at,
+    mh.created_at
+FROM media_highlights mh
+WHERE mh.media_item_id = $1 AND mh.user_id = $2 AND mh.deleted = TRUE
+UNION ALL
+SELECT
+    mn.id,
+    mn.dedup_key,
+    'note' as annotation_type,
+    mn.content as display_text,
+    NULL::text as secondary_text,
+    NULL::text as color,
+    mn.deleted_at,
+    mn.created_at
+FROM media_notes mn
+WHERE mn.media_item_id = $1 AND mn.user_id = $2 AND mn.deleted = TRUE
+UNION ALL
+SELECT
+    mb.id,
+    mb.dedup_key,
+    'bookmark' as annotation_type,
+    mb.title as display_text,
+    mb.notes as secondary_text,
+    NULL::text as color,
+    mb.deleted_at,
+    mb.created_at
+FROM media_bookmarks mb
+WHERE mb.media_item_id = $1 AND mb.user_id = $2 AND mb.deleted = TRUE
+ORDER BY deleted_at DESC;
+
+-- name: RestoreMediaHighlightByID :execrows
+UPDATE media_highlights SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
+-- name: RestoreMediaNoteByID :execrows
+UPDATE media_notes SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
+-- name: RestoreMediaBookmarkByID :execrows
+UPDATE media_bookmarks SET
+    deleted = FALSE,
+    deleted_at = NULL,
+    last_modified_at = NOW()
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
+-- Permanent removal from the history (distinct from the TTL-driven purge,
+-- which is maintenance). Scoped to the owning user and book.
+-- name: PurgeMediaHighlightByID :execrows
+DELETE FROM media_highlights
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
+-- name: PurgeMediaNoteByID :execrows
+DELETE FROM media_notes
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
+-- name: PurgeMediaBookmarkByID :execrows
+DELETE FROM media_bookmarks
+WHERE id = $1 AND user_id = $2 AND media_item_id = $3 AND deleted = TRUE;
+
 -- Refresh Tokens queries
 -- name: CreateRefreshToken :one
 INSERT INTO refresh_tokens (user_id, token, expires_at)

internal/handlers/annotation_history.go

@@ -0,0 +1,167 @@
+package handlers
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"bookhoard/internal/database"
+	wsync "bookhoard/internal/sync"
+
+	"github.com/google/uuid"
+	"github.com/jackc/pgx/v5/pgtype"
+	"github.com/labstack/echo/v5"
+)
+
+// DeletedAnnotationResponse is one entry of the deleted-annotation history
+// for a book (the book page's "recently deleted" list). Restoring returns the
+// row to the active set; purging removes it permanently.
+type DeletedAnnotationResponse struct {
+	ID             string    `json:"id"`
+	AnnotationType string    `json:"annotation_type"`
+	DisplayText    string    `json:"display_text"`
+	SecondaryText  string    `json:"secondary_text,omitempty"`
+	Color          string    `json:"color,omitempty"`
+	DeletedAt      time.Time `json:"deleted_at"`
+	CreatedAt      time.Time `json:"created_at"`
+}
+
+// DeletedAnnotationsForBook builds the deleted-annotation history for a user
+// and book. Shared by the JSON API and the book page's server-rendered modal.
+func DeletedAnnotationsForBook(ctx context.Context, db *database.Queries, userID, mediaItemID pgtype.UUID) []DeletedAnnotationResponse {
+	rows, err := db.ListDeletedAnnotationsForBook(ctx, database.ListDeletedAnnotationsForBookParams{
+		MediaItemID: mediaItemID,
+		UserID:      userID,
+	})
+	if err != nil {
+		return []DeletedAnnotationResponse{}
+	}
+
+	response := make([]DeletedAnnotationResponse, 0, len(rows))
+	for _, row := range rows {
+		entry := DeletedAnnotationResponse{
+			ID:             uuid.UUID(row.ID.Bytes).String(),
+			AnnotationType: row.AnnotationType,
+			DisplayText:    row.DisplayText,
+			SecondaryText:  row.SecondaryText.String,
+			Color:          row.Color.String,
+		}
+		if row.DeletedAt.Valid {
+			entry.DeletedAt = row.DeletedAt.Time
+		}
+		if row.CreatedAt.Valid {
+			entry.CreatedAt = row.CreatedAt.Time
+		}
+		response = append(response, entry)
+	}
+	return response
+}
+
+// GetDeletedAnnotations handles GET /api/media-items/:id/annotations/deleted
+func (mh *MediaHandler) GetDeletedAnnotations(c *echo.Context) error {
+	userUUID, mediaUUID, err := mh.parseUserAndMediaIDs(c)
+	if err != nil {
+		return err
+	}
+
+	response := DeletedAnnotationsForBook(c.Request().Context(), mh.db, userUUID, mediaUUID)
+
+	return c.JSON(http.StatusOK, map[string]interface{}{
+		"deleted_annotations": response,
+		"total":               len(response),
+	})
+}
+
+// RestoreDeletedAnnotation handles POST /api/media-items/:id/annotations/:annotationId/restore
+// Body/query: annotation_type=highlight|note|bookmark
+func (mh *MediaHandler) RestoreDeletedAnnotation(c *echo.Context) error {
+	userUUID, mediaUUID, annotationUUID, kind, errResp := mh.parseAnnotationHistoryRequest(c, true)
+	if errResp != nil {
+		return errResp
+	}
+
+	if mh.annotationSvc == nil {
+		return c.JSON(http.StatusServiceUnavailable, map[string]string{"error": "annotation service unavailable"})
+	}
+
+	restored, err := mh.annotationSvc.RestoreAnnotationByID(c.Request().Context(), kind, userUUID, mediaUUID, annotationUUID)
+	if err != nil {
+		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to restore annotation"})
+	}
+	if !restored {
+		return c.JSON(http.StatusNotFound, map[string]string{"error": "deleted annotation not found"})
+	}
+
+	return c.JSON(http.StatusOK, map[string]interface{}{"restored": true})
+}
+
+// PurgeDeletedAnnotation handles DELETE /api/media-items/:id/annotations/:annotationId
+// Query: annotation_type=highlight|note|bookmark. Permanent — removes the
+// tombstoned row from the history.
+func (mh *MediaHandler) PurgeDeletedAnnotation(c *echo.Context) error {
+	userUUID, mediaUUID, annotationUUID, kind, errResp := mh.parseAnnotationHistoryRequest(c, false)
+	if errResp != nil {
+		return errResp
+	}
+
+	if mh.annotationSvc == nil {
+		return c.JSON(http.StatusServiceUnavailable, map[string]string{"error": "annotation service unavailable"})
+	}
+
+	purged, err := mh.annotationSvc.PurgeAnnotationByID(c.Request().Context(), kind, userUUID, mediaUUID, annotationUUID)
+	if err != nil {
+		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to purge annotation"})
+	}
+	if !purged {
+		return c.JSON(http.StatusNotFound, map[string]string{"error": "deleted annotation not found"})
+	}
+
+	return c.JSON(http.StatusOK, map[string]interface{}{"purged": true})
+}
+
+// parseUserAndMediaIDs extracts the authenticated user and the media item
+// from the route. A non-nil error has already been written as the response.
+func (mh *MediaHandler) parseUserAndMediaIDs(c *echo.Context) (pgtype.UUID, pgtype.UUID, error) {
+	userID := c.Get("user_id").(string)
+	userUUID, err := uuid.Parse(userID)
+	if err != nil {
+		return pgtype.UUID{}, pgtype.UUID{}, c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user"})
+	}
+	mediaID := c.Param("id")
+	mediaIDUUID, err := uuid.Parse(mediaID)
+	if err != nil {
+		return pgtype.UUID{}, pgtype.UUID{}, c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item id"})
+	}
+	return pgtype.UUID{Bytes: userUUID, Valid: true}, pgtype.UUID{Bytes: mediaIDUUID, Valid: true}, nil
+}
+
+// parseAnnotationHistoryRequest extracts user, media item, annotation ID, and
+// the annotation_type (from query param or JSON body — restore posts a body,
+// purge uses a query param). A non-nil error has already been written.
+func (mh *MediaHandler) parseAnnotationHistoryRequest(c *echo.Context, allowBody bool) (pgtype.UUID, pgtype.UUID, pgtype.UUID, string, error) {
+	userUUID, mediaUUID, err := mh.parseUserAndMediaIDs(c)
+	if err != nil {
+		return pgtype.UUID{}, pgtype.UUID{}, pgtype.UUID{}, "", err
+	}
+
+	annotationID := c.Param("annotationId")
+	annotationUUID, err := uuid.Parse(annotationID)
+	if err != nil {
+		return pgtype.UUID{}, pgtype.UUID{}, pgtype.UUID{}, "", c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid annotation id"})
+	}
+
+	kind := c.QueryParam("annotation_type")
+	if kind == "" && allowBody {
+		var body struct {
+			AnnotationType string `json:"annotation_type"`
+		}
+		if c.Bind(&body) == nil {
+			kind = body.AnnotationType
+		}
+	}
+	if !wsync.ValidAnnotationKind(kind) {
+		return pgtype.UUID{}, pgtype.UUID{}, pgtype.UUID{}, "", c.JSON(http.StatusBadRequest, map[string]string{"error": "annotation_type must be highlight, note, or bookmark"})
+	}
+
+	return userUUID, mediaUUID, pgtype.UUID{Bytes: annotationUUID, Valid: true}, kind, nil
+}

internal/handlers/koreader.go

@@ -9,7 +9,10 @@ import (
 	"fmt"
 	"log"
 	"net/http"
+	"strconv"
+	"strings"
 	"time"
+	"unicode/utf8"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgtype"
@@ -47,7 +50,7 @@ func (h *KOReaderHandler) SetAnnotationService(svc *wsync.AnnotationService) {
 	h.annotationSvc = svc
 }
 
-func (h *KOReaderHandler) convertHighlightPositions(ctx context.Context, mediaItemID pgtype.UUID, pos0, pos1 string) (string, string) {
+func (h *KOReaderHandler) convertHighlightPositions(ctx context.Context, mediaItemID pgtype.UUID, pos0, pos1, contextText string) (string, string) {
 	if pos0 == "" || h.libraryService == nil {
 		return "", ""
 	}
@@ -59,9 +62,89 @@ func (h *KOReaderHandler) convertHighlightPositions(ctx context.Context, mediaIt
 	if err != nil || epubPath == "" {
 		return "", ""
 	}
-	startLoc := wsync.ConvertToCanonical(wsync.LocatorSourceKOReader, pos0, 0, "", mediaItem.FormatGroup, epubPath, "")
+	// The annotation's own text is the ideal anchor for the converter's
+	// text-search path: clients (thin, underpowered) send only raw
+	// locators, the server resolves them against the actual book.
+	startLoc := wsync.ConvertToCanonical(wsync.LocatorSourceKOReader, pos0, 0, contextText, mediaItem.FormatGroup, epubPath, "")
 	endLoc := wsync.ConvertToCanonical(wsync.LocatorSourceKOReader, pos1, 0, "", mediaItem.FormatGroup, epubPath, "")
-	return startLoc.CFI, endLoc.CFI
+	endCFI := endLoc.CFI
+	// The end conversion carries no context text, so unless it resolved
+	// exactly it degenerates to a percentage fallback anchored at the
+	// document start — useless as a range end. When the START resolved
+	// exactly, derive the end from it: same node, character offset
+	// advanced by the selection's UTF-16 length (the CFI offset unit).
+	if endLoc.Precision != "exact" && startLoc.Precision == "exact" && contextText != "" {
+		endCFI = extendCFIByLength(startLoc.CFI, contextText)
+	}
+	return startLoc.CFI, endCFI
+}
+
+// extendCFIByLength advances a point CFI's trailing character offset by the
+// UTF-16 length of text (EPUB CFI character offsets are UTF-16 code units).
+// Selections spanning multiple text nodes produce an out-of-range offset —
+// harmless: resolution clamps or fails, and consumers fall back to the start.
+func extendCFIByLength(cfi, text string) string {
+	if cfi == "" || text == "" {
+		return cfi
+	}
+	i := strings.LastIndex(cfi, ":")
+	if i < 0 || !strings.HasSuffix(cfi, ")") {
+		return cfi
+	}
+	off, err := strconv.Atoi(cfi[i+1 : len(cfi)-1])
+	if err != nil {
+		return cfi
+	}
+	utf16len := 0
+	for _, r := range text {
+		if r > 0xFFFF {
+			utf16len += 2
+		} else {
+			utf16len++
+		}
+	}
+	return cfi[:i+1] + strconv.Itoa(off+utf16len) + ")"
+}
+
+// existingHighlightColor returns the stored color of the highlight matching
+// the dedup key ("" when none) so device echoes that carry no color never
+// clobber the web color.
+func (h *KOReaderHandler) existingHighlightColor(ctx context.Context, mediaItemID, userID pgtype.UUID, dedupKey string) string {
+	if dedupKey == "" {
+		return ""
+	}
+	existing, err := h.db.GetMediaHighlightByDedupKey(ctx, database.GetMediaHighlightByDedupKeyParams{
+		UserID:      userID,
+		MediaItemID: mediaItemID,
+		DedupKey:    pgtype.Text{String: dedupKey, Valid: true},
+	})
+	if err != nil {
+		return ""
+	}
+	return existing.Color.String
+}
+
+// deriveAnnotationPercentage computes a percentage for device-pushed
+// annotations when the client didn't send one (thin clients skip their own
+// per-annotation page lookups; arithmetic is only free on paging documents).
+func (h *KOReaderHandler) deriveAnnotationPercentage(ctx context.Context, mediaItemID pgtype.UUID, pos0 string, page int) float64 {
+	mediaItem, err := h.db.GetMediaItem(ctx, mediaItemID)
+	if err != nil {
+		return 0
+	}
+	formatGroup := wsync.FormatGroup(mediaItem.FormatGroup)
+	if formatGroup == wsync.FormatGroupFixedLayout || formatGroup == wsync.FormatGroupComicArchive {
+		if page > 0 && mediaItem.PageCount.Valid && mediaItem.PageCount.Int32 > 0 {
+			return float64(page) / float64(mediaItem.PageCount.Int32)
+		}
+		return 0
+	}
+	if wsync.IsCREXPointer(pos0) && h.libraryService != nil {
+		if epubPath, err := h.libraryService.ResolveMediaPath(ctx, mediaItem.LibraryID, mediaItem.FilePath); err == nil && epubPath != "" {
+			return wsync.NewCFIConverter(epubPath).SectionPercentage(pos0)
+		}
+	}
+	return 0
 }
 
 func (h *KOReaderHandler) SetLibraryService(svc LibraryPathResolver) {
@@ -75,24 +158,35 @@ type KOReaderProgressRequest struct {
 }
 
 type KOReaderBookProgress struct {
-	UUID       string              `json:"uuid,omitempty"`
-	SHA256     string              `json:"sha256,omitempty"`
-	Title      string              `json:"title,omitempty"`
-	Authors    []string            `json:"authors,omitempty"`
-	Progress   float64             `json:"progress"`
-	Percentage float64             `json:"percentage"`
-	LastRead   string              `json:"last_read,omitempty"`
-	FilePath   string              `json:"file_path,omitempty"`
-	DeviceInfo KOReaderDeviceInfo  `json:"device_info,omitempty"`
-	Bookmarks  []KOReaderBookmark  `json:"bookmarks,omitempty"`
-	Highlights []KOReaderHighlight `json:"highlights,omitempty"`
-	Notes      []KOReaderNote      `json:"notes,omitempty"`
-	Chapter      *int                `json:"chapter,omitempty"`
-	Character    *int64              `json:"character,omitempty"`
-	Epubcfi      *string             `json:"epubcfi,omitempty"`
-	ContextText  *string             `json:"context_text,omitempty"`
-	Page         *int                `json:"page,omitempty"`
-	TotalPages   *int                `json:"total_pages,omitempty"`
+	UUID        string                   `json:"uuid,omitempty"`
+	SHA256      string                   `json:"sha256,omitempty"`
+	Title       string                   `json:"title,omitempty"`
+	Authors     []string                 `json:"authors,omitempty"`
+	Progress    float64                  `json:"progress"`
+	Percentage  float64                  `json:"percentage"`
+	LastRead    string                   `json:"last_read,omitempty"`
+	FilePath    string                   `json:"file_path,omitempty"`
+	DeviceInfo  KOReaderDeviceInfo       `json:"device_info,omitempty"`
+	Bookmarks   []KOReaderBookmark       `json:"bookmarks,omitempty"`
+	Highlights  []KOReaderHighlight      `json:"highlights,omitempty"`
+	Notes       []KOReaderNote           `json:"notes,omitempty"`
+	Chapter     *int                     `json:"chapter,omitempty"`
+	Character   *int64                   `json:"character,omitempty"`
+	Epubcfi     *string                  `json:"epubcfi,omitempty"`
+	ContextText *string                  `json:"context_text,omitempty"`
+	Page        *int                     `json:"page,omitempty"`
+	TotalPages  *int                     `json:"total_pages,omitempty"`
+	// Device-side deletions, reported by dedup key. Keys refer to annotations
+	// the device previously received from the server (or echoes of its own
+	// pushes); the device only flags a deletion after observing the key in a
+	// pull, so absence from these arrays is never interpreted as deletion.
+	DeletedHighlights []KOReaderDeletedAnnotation `json:"deleted_highlights,omitempty"`
+	DeletedBookmarks  []KOReaderDeletedAnnotation `json:"deleted_bookmarks,omitempty"`
+}
+
+// KOReaderDeletedAnnotation identifies a deleted annotation by dedup key.
+type KOReaderDeletedAnnotation struct {
+	DedupKey string `json:"dedup_key"`
 }
 
 type KOReaderDeviceInfo struct {
@@ -100,53 +194,91 @@ type KOReaderDeviceInfo struct {
 	DeviceModel     string `json:"device_model,omitempty"`
 }
 
+// FlexInt tolerates the loose types KOReader clients send for optional
+// numeric fields: JSON numbers, numeric strings ("30"), empty strings
+// (""), or non-numeric strings ("/body/..." xpointers in `page` for CRE
+// documents) — the latter decode to 0. Without this, a single annotation
+// carrying chapter:"" or page:"/body/..." failed the whole request bind
+// with a 400.
+type FlexInt int
+
+func (f *FlexInt) UnmarshalJSON(b []byte) error {
+	s := strings.TrimSpace(string(b))
+	if s == "null" || s == `""` {
+		*f = 0
+		return nil
+	}
+	if n, err := strconv.Atoi(s); err == nil {
+		*f = FlexInt(n)
+		return nil
+	}
+	if strings.HasPrefix(s, `"`) && strings.HasSuffix(s, `"`) {
+		inner := s[1 : len(s)-1]
+		if n, err := strconv.Atoi(inner); err == nil {
+			*f = FlexInt(n)
+			return nil
+		}
+		*f = 0
+		return nil
+	}
+	if fl, err := strconv.ParseFloat(s, 64); err == nil {
+		*f = FlexInt(int(fl))
+		return nil
+	}
+	*f = 0
+	return nil
+}
+
 type KOReaderBookmark struct {
-	Chapter    int      `json:"chapter,omitempty"`
+	Chapter    FlexInt  `json:"chapter,omitempty"`
 	Datetime   string   `json:"datetime,omitempty"`
 	Notes      string   `json:"notes,omitempty"`
 	Pos0       string   `json:"pos0,omitempty"`
 	Pos1       string   `json:"pos1,omitempty"`
-	Page       int      `json:"page,omitempty"`
+	Page       FlexInt  `json:"page,omitempty"`
 	Text       string   `json:"text,omitempty"`
 	Type       string   `json:"type,omitempty"`
 	Percentage *float64 `json:"percentage,omitempty"`
 	BookSHA256 string   `json:"book_sha256,omitempty"`
+	DedupKey   string   `json:"dedup_key,omitempty"`
 }
 
 type KOReaderHighlight struct {
-	Chapter    int      `json:"chapter,omitempty"`
+	Chapter    FlexInt  `json:"chapter,omitempty"`
 	Datetime   string   `json:"datetime,omitempty"`
 	Notes      string   `json:"notes,omitempty"`
 	Pos0       string   `json:"pos0,omitempty"`
 	Pos1       string   `json:"pos1,omitempty"`
-	Page       int      `json:"page,omitempty"`
+	Page       FlexInt  `json:"page,omitempty"`
 	Text       string   `json:"text,omitempty"`
 	Type       string   `json:"type,omitempty"`
 	Color      string   `json:"color,omitempty"`
 	Percentage *float64 `json:"percentage,omitempty"`
 	BookSHA256 string   `json:"book_sha256,omitempty"`
+	DedupKey   string   `json:"dedup_key,omitempty"`
 }
 
 type KOReaderNote struct {
-	Chapter    int      `json:"chapter,omitempty"`
+	Chapter    FlexInt  `json:"chapter,omitempty"`
 	Datetime   string   `json:"datetime,omitempty"`
 	Notes      string   `json:"notes,omitempty"`
 	Pos0       string   `json:"pos0,omitempty"`
 	Pos1       string   `json:"pos1,omitempty"`
-	Page       int      `json:"page,omitempty"`
+	Page       FlexInt  `json:"page,omitempty"`
 	Text       string   `json:"text,omitempty"`
 	Type       string   `json:"type,omitempty"`
 	Percentage *float64 `json:"percentage,omitempty"`
 	BookSHA256 string   `json:"book_sha256,omitempty"`
+	DedupKey   string   `json:"dedup_key,omitempty"`
 }
 
 type KOReaderSyncResponse struct {
-	SyncStatus    string                  `json:"sync_status"`
-	BooksSynced   int                     `json:"books_synced"`
+	SyncStatus    string                   `json:"sync_status"`
+	BooksSynced   int                      `json:"books_synced"`
 	BookResults   []KOReaderBookSyncResult `json:"book_results,omitempty"`
-	Conflicts     []KOReaderConflict      `json:"conflicts,omitempty"`
-	Timestamp     string                  `json:"timestamp"`
-	DeviceUpdated bool                    `json:"device_updated"`
+	Conflicts     []KOReaderConflict       `json:"conflicts,omitempty"`
+	Timestamp     string                   `json:"timestamp"`
+	DeviceUpdated bool                     `json:"device_updated"`
 }
 
 type KOReaderBookSyncResult struct {
@@ -174,20 +306,20 @@ type KOReaderMetadata struct {
 }
 
 type KOReaderProgressData struct {
-	Percentage         float64  `json:"percentage"`
-	Character          *int64   `json:"character,omitempty"`
-	Epubcfi            *string  `json:"epubcfi,omitempty"`
-	KoreaderXPointer   *string  `json:"koreader_xpointer,omitempty"`
-	Chapter            *int     `json:"chapter,omitempty"`
-	ChapterProgress    *float64 `json:"chapter_progress,omitempty"`
-	Page               *int     `json:"page,omitempty"`
-	TotalPages         *int     `json:"total_pages,omitempty"`
+	Percentage       float64  `json:"percentage"`
+	Character        *int64   `json:"character,omitempty"`
+	Epubcfi          *string  `json:"epubcfi,omitempty"`
+	KoreaderXPointer *string  `json:"koreader_xpointer,omitempty"`
+	Chapter          *int     `json:"chapter,omitempty"`
+	ChapterProgress  *float64 `json:"chapter_progress,omitempty"`
+	Page             *int     `json:"page,omitempty"`
+	TotalPages       *int     `json:"total_pages,omitempty"`
 }
 
 type KOReaderAnnotations struct {
-	Highlights        []KOReaderHighlight `json:"highlights,omitempty"`
-	Notes             []KOReaderNote      `json:"notes,omitempty"`
-	Bookmarks         []KOReaderBookmark  `json:"bookmarks,omitempty"`
+	Highlights        []KOReaderHighlight      `json:"highlights,omitempty"`
+	Notes             []KOReaderNote           `json:"notes,omitempty"`
+	Bookmarks         []KOReaderBookmark       `json:"bookmarks,omitempty"`
 	DeletedHighlights []map[string]interface{} `json:"deleted_highlights,omitempty"`
 	DeletedBookmarks  []map[string]interface{} `json:"deleted_bookmarks,omitempty"`
 }
@@ -486,12 +618,16 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 	for _, hl := range book.Highlights {
 		startPos := hl.Pos0
 		endPos := hl.Pos1
-		epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, startPos, endPos)
+		// The highlight's own text anchors the conversion exactly.
+		epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, startPos, endPos, hl.Text)
 
 		pctStart := 0.0
 		if hl.Percentage != nil {
 			pctStart = *hl.Percentage
 		}
+		if pctStart == 0 {
+			pctStart = h.deriveAnnotationPercentage(ctx, mediaItemID, startPos, int(hl.Page))
+		}
 
 		deviceData, _ := json.Marshal(map[string]interface{}{
 			"datetime": hl.Datetime,
@@ -500,31 +636,55 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 			"page":     hl.Page,
 		})
 
+		// Color semantics: devices render their own default and cannot
+		// round-trip web colors. An echo carries NO color — preserve the
+		// stored (web) color so round-trips never change it. A non-empty
+		// color means the user edited the highlight on the device: map the
+		// device color name and let it win.
+		color := ""
+		if hl.Color != "" {
+			color = mapColorFromKOReader(hl.Color)
+		}
+		dedupKey := hl.DedupKey
+		if dedupKey == "" {
+			dedupKey = wsync.ComputeDedupKey(hl.Text, epubcfiStart, startPos)
+		}
+		if color == "" {
+			color = h.existingHighlightColor(ctx, mediaItemID, userID, dedupKey)
+		}
+		if color == "" {
+			color = "#ffd54f"
+		}
+
 		h.annotationSvc.SaveHighlight(ctx, wsync.SaveHighlightRequest{
-			MediaItemID:      mediaItemID,
-			UserID:           userID,
-			SelectionText:    hl.Text,
-			StartPosition:    startPos,
-			EndPosition:      endPos,
-			Color:            hl.Color,
-			NoteText:         hl.Notes,
-			PercentageStart:  pctStart,
-			EpubcfiStart:     epubcfiStart,
-			EpubcfiEnd:       epubcfiEnd,
-			Source:           "koreader",
-			DeviceSyncData:   deviceData,
+			MediaItemID:     mediaItemID,
+			UserID:          userID,
+			SelectionText:   hl.Text,
+			StartPosition:   startPos,
+			EndPosition:     endPos,
+			Color:           color,
+			NoteText:        hl.Notes,
+			PercentageStart: pctStart,
+			EpubcfiStart:    epubcfiStart,
+			EpubcfiEnd:      epubcfiEnd,
+			Source:          "koreader",
+			DeviceSyncData:  deviceData,
+			DedupKey:        dedupKey,
 		})
 	}
 
 	for _, note := range book.Notes {
 		startPos := note.Pos0
 		endPos := note.Pos1
-		epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, startPos, endPos)
+		epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, startPos, endPos, note.Text)
 
 		pctStart := 0.0
 		if note.Percentage != nil {
 			pctStart = *note.Percentage
 		}
+		if pctStart == 0 {
+			pctStart = h.deriveAnnotationPercentage(ctx, mediaItemID, startPos, int(note.Page))
+		}
 
 		deviceData, _ := json.Marshal(map[string]interface{}{
 			"datetime": note.Datetime,
@@ -533,18 +693,25 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 			"page":     note.Page,
 		})
 
+		dedupKey := note.DedupKey
+		if dedupKey == "" {
+			dedupKey = wsync.ComputeDedupKey(note.Text, epubcfiStart, startPos)
+		}
+
 		h.annotationSvc.SaveHighlight(ctx, wsync.SaveHighlightRequest{
-			MediaItemID:      mediaItemID,
-			UserID:           userID,
-			SelectionText:    note.Text,
-			StartPosition:    startPos,
-			EndPosition:      endPos,
-			NoteText:         note.Notes,
-			PercentageStart:  pctStart,
-			EpubcfiStart:     epubcfiStart,
-			EpubcfiEnd:       epubcfiEnd,
-			Source:           "koreader",
-			DeviceSyncData:   deviceData,
+			MediaItemID:     mediaItemID,
+			UserID:          userID,
+			SelectionText:   note.Text,
+			StartPosition:   startPos,
+			EndPosition:     endPos,
+			Color:           h.existingHighlightColor(ctx, mediaItemID, userID, dedupKey),
+			NoteText:        note.Notes,
+			PercentageStart: pctStart,
+			EpubcfiStart:    epubcfiStart,
+			EpubcfiEnd:      epubcfiEnd,
+			Source:          "koreader",
+			DeviceSyncData:  deviceData,
+			DedupKey:        dedupKey,
 		})
 	}
 
@@ -562,6 +729,11 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 			"page":     bookmark.Page,
 		})
 
+		dedupKey := bookmark.DedupKey
+		if dedupKey == "" {
+			dedupKey = wsync.ComputeDedupKey(bookmark.Text, "", position)
+		}
+
 		h.annotationSvc.SaveBookmark(ctx, wsync.SaveBookmarkRequest{
 			MediaItemID:    mediaItemID,
 			UserID:         userID,
@@ -570,8 +742,33 @@ func (h *KOReaderHandler) processBookAnnotations(ctx context.Context, deviceID,
 			ChapterNumber:  int32(bookmark.Chapter),
 			Source:         "koreader",
 			DeviceSyncData: deviceData,
+			DedupKey:       dedupKey,
 		})
 	}
+
+	// Device-reported deletions: tombstone by dedup key. Tombstoned rows stay
+	// in the history (restorable from the book page) and are echoed to other
+	// devices as tombstones on their next pull. A device replay that pushes a
+	// stale copy of the annotation cannot resurrect the tombstone (its save
+	// carries no modification timestamp newer than the delete). Deletions run
+	// after the upserts purely so a key present in both lists resolves to
+	// "deleted" — the newer intent.
+	for _, del := range book.DeletedHighlights {
+		if del.DedupKey == "" {
+			continue
+		}
+		if err := h.annotationSvc.TombstoneHighlight(ctx, userID, mediaItemID, del.DedupKey, "koreader"); err != nil {
+			log.Printf("KOReader: tombstone highlight by dedup key failed: %v", err)
+		}
+	}
+	for _, del := range book.DeletedBookmarks {
+		if del.DedupKey == "" {
+			continue
+		}
+		if err := h.annotationSvc.TombstoneBookmarkByDedupKey(ctx, userID, mediaItemID, del.DedupKey, "koreader"); err != nil {
+			log.Printf("KOReader: tombstone bookmark by dedup key failed: %v", err)
+		}
+	}
 }
 
 func (h *KOReaderHandler) updateProgressForBook(c *echo.Context, deviceID pgtype.UUID, userID pgtype.UUID, mediaItemID pgtype.UUID, book KOReaderBookProgress) error {
@@ -721,6 +918,43 @@ func int64PtrToPgInt8(i *int64) pgtype.Int8 {
 	return pgtype.Int8{}
 }
 
+type KOReaderResolveResponse struct {
+	BookUUID string `json:"book_uuid"`
+	SHA256   string `json:"sha256,omitempty"`
+	Title    string `json:"title,omitempty"`
+	Author   string `json:"author,omitempty"`
+}
+
+// ResolveBook maps a file SHA-256 to the book's UUID without touching any
+// progress state. Devices need the UUID to pull metadata, but a freshly
+// downloaded book has none cached yet — the old way of learning it was to
+// push once, which transmitted the device's first-page position to the
+// server and manufactured a progress conflict for books already mid-read
+// from another source. This read-only lookup lets the client link (and
+// pull) without ever pushing bootstrap progress.
+func (h *KOReaderHandler) ResolveBook(c *echo.Context) error {
+	sha256 := c.QueryParam("sha256")
+	if sha256 == "" || len(sha256) != 64 {
+		return c.JSON(http.StatusBadRequest, map[string]string{
+			"error": "sha256 query parameter is required (64 hex characters)",
+		})
+	}
+
+	mediaItem, _, err := h.bookResolver.ResolveBySHA256(c.Request().Context(), sha256)
+	if err != nil {
+		return c.JSON(http.StatusNotFound, map[string]string{
+			"error": "book not found",
+		})
+	}
+
+	return c.JSON(http.StatusOK, KOReaderResolveResponse{
+		BookUUID: uuid.UUID(mediaItem.ID.Bytes).String(),
+		SHA256:   sha256,
+		Title:    mediaItem.Title,
+		Author:   mediaItem.Author.String,
+	})
+}
+
 func (h *KOReaderHandler) GetMetadata(c *echo.Context) error {
 	device := c.Get("device").(database.Devices)
 	userID := device.UserID.Bytes
@@ -809,34 +1043,52 @@ func (h *KOReaderHandler) GetMetadata(c *echo.Context) error {
 
 	for _, ann := range annotations {
 		if ann.AnnotationType == "highlight" {
-			pos0 := ann.StartPosition.String
-			pos1 := ann.EndPosition.String
-			if ann.EpubcfiStart.Valid && ann.EpubcfiStart.String != "" {
-				if converted := h.reverseConvertCFI(c, mediaItem, ann.EpubcfiStart.String); converted != "" {
-					pos0 = converted
-				}
+			// Selection text doubles as the converter's text-search context.
+			pos0 := h.koreaderPos0(c, mediaItem, ann.StartPosition.String, ann.EpubcfiStart.String, ann.SelectionText)
+			pos1 := h.koreaderPos0(c, mediaItem, ann.EndPosition.String, ann.EpubcfiEnd.String, ann.SelectionText)
+			if pos0 == "" {
+				// Nothing the device could place — serving a locator it can't
+				// resolve would create junk bookmarks that re-push as
+				// duplicates, so skip instead.
+				log.Printf("Bookhoard: GetMetadata skip highlight %s (no resolvable pos0)", ann.ID)
+				continue
 			}
-			if ann.EpubcfiEnd.Valid && ann.EpubcfiEnd.String != "" {
-				if converted := h.reverseConvertCFI(c, mediaItem, ann.EpubcfiEnd.String); converted != "" {
-					pos1 = converted
-				}
+			// Old web highlights carry no end anchor, and converted range
+			// CFIs resolve to their start — either way pos1 collapses onto
+			// pos0 and the device paints a zero-width highlight. Derive the
+			// end by advancing the start's character offset by the length
+			// of the selected text.
+			if pos1 == "" || pos1 == pos0 {
+				pos1 = extendXPointerByLength(pos0, ann.SelectionText)
 			}
 			highlight := KOReaderHighlight{
-				Text:     ann.SelectionText,
-				Pos0:     pos0,
-				Pos1:     pos1,
-				Color:    ann.Color.String,
+				Text: ann.SelectionText,
+				Pos0: pos0,
+				Pos1: pos1,
+				// Web colors flow to the device, mapped to KOReader's named
+				// palette. Round-trip safety: the device suppresses the color
+				// when echoing un-edited applied entries (a pink→purple
+				// palette mismatch must not rewrite the stored hex), and an
+				// actual device edit pushes its color, which wins.
+				Color:    mapColorToKOReader(ann.Color.String),
 				Datetime: ann.CreatedAt.Time.Format(time.RFC3339),
+				DedupKey: ann.DedupKey.String,
 			}
 			if ann.NoteText.Valid && ann.NoteText.String != "" {
 				highlight.Notes = ann.NoteText.String
 			}
 			annotationsResponse.Highlights = append(annotationsResponse.Highlights, highlight)
 		} else if ann.AnnotationType == "note" {
+			pos0 := h.koreaderPos0(c, mediaItem, ann.StartPosition.String, ann.EpubcfiStart.String, "")
+			if pos0 == "" {
+				log.Printf("Bookhoard: GetMetadata skip note %s (no resolvable pos0)", ann.ID)
+				continue
+			}
 			annotationsResponse.Notes = append(annotationsResponse.Notes, KOReaderNote{
 				Text:     ann.SelectionText,
-				Pos0:     ann.StartPosition.String,
+				Pos0:     pos0,
 				Datetime: ann.CreatedAt.Time.Format(time.RFC3339),
+				DedupKey: ann.DedupKey.String,
 			})
 		}
 	}
@@ -846,21 +1098,23 @@ func (h *KOReaderHandler) GetMetadata(c *echo.Context) error {
 		UserID:      pgUserID,
 	})
 	for _, bm := range bookmarks {
-		pos0 := bm.Position.String
-		if pos0 == "" && bm.CfiPosition.Valid {
-			pos0 = bm.CfiPosition.String
+		pos0 := h.koreaderPos0(c, mediaItem, bm.Position.String, bm.CfiPosition.String, "")
+		if pos0 == "" {
+			log.Printf("Bookhoard: GetMetadata skip bookmark %s (no resolvable pos0)", bm.ID)
+			continue
 		}
 		koreaderBookmark := KOReaderBookmark{
 			Text:     bm.Title,
 			Pos0:     pos0,
 			Pos1:     pos0,
 			Datetime: bm.CreatedAt.Time.Format(time.RFC3339),
+			DedupKey: bm.DedupKey.String,
 		}
 		if bm.Notes.Valid && bm.Notes.String != "" {
 			koreaderBookmark.Notes = bm.Notes.String
 		}
 		if bm.ChapterNumber.Valid {
-			koreaderBookmark.Chapter = int(bm.ChapterNumber.Int32)
+			koreaderBookmark.Chapter = FlexInt(bm.ChapterNumber.Int32)
 		}
 		annotationsResponse.Bookmarks = append(annotationsResponse.Bookmarks, koreaderBookmark)
 	}
@@ -880,6 +1134,14 @@ func (h *KOReaderHandler) GetMetadata(c *echo.Context) error {
 			dd = map[string]interface{}{}
 		}
 		dd["dedup_key"] = ts.DedupKey.String
+		// KOReader deletes by matching pos0. Device-pushed annotations carry
+		// it in device_sync_data; web-created ones don't (their locator is
+		// converted at serve time), so resolve it from the stored columns.
+		if dd["pos0"] == nil || dd["pos0"] == "" {
+			if pos0 := h.koreaderPos0(c, mediaItem, ts.StartPosition.String, ts.EpubcfiStart.String, ""); pos0 != "" {
+				dd["pos0"] = pos0
+			}
+		}
 		if ts.AnnotationType == "highlight" {
 			annotationsResponse.DeletedHighlights = append(annotationsResponse.DeletedHighlights, dd)
 		} else if ts.AnnotationType == "bookmark" {
@@ -939,7 +1201,7 @@ func (h *KOReaderHandler) convertCFIToXPointer(c *echo.Context, mediaItem databa
 	}
 }
 
-func (h *KOReaderHandler) reverseConvertCFI(c *echo.Context, mediaItem database.MediaItems, epubcfi string) string {
+func (h *KOReaderHandler) reverseConvertCFI(c *echo.Context, mediaItem database.MediaItems, epubcfi string, contextText string) string {
 	if h.libraryService == nil || epubcfi == "" {
 		return ""
 	}
@@ -947,13 +1209,138 @@ func (h *KOReaderHandler) reverseConvertCFI(c *echo.Context, mediaItem database.
 	if err != nil || epubPath == "" {
 		return ""
 	}
-	loc := wsync.ConvertFromCanonical(wsync.LocatorSourceKOReader, epubcfi, 0, "", mediaItem.FormatGroup, epubPath, "")
+	loc := wsync.ConvertFromCanonical(wsync.LocatorSourceKOReader, epubcfi, 0, contextText, mediaItem.FormatGroup, epubPath, "")
 	if loc.Position != "" && loc.Position != epubcfi {
 		return loc.Position
 	}
 	return ""
 }
 
+// pdfRectAnchor is the JSON locator the web reader stores in epubcfi_start
+// for PDF text highlights (page-fraction rects; page index is 0-based).
+type pdfRectAnchor struct {
+	V     int         `json:"v"`
+	Page  int         `json:"page"`
+	Rects [][]float64 `json:"rects"`
+}
+
+// koreaderPos0 resolves a device-native KOReader pos0 from an annotation's
+// stored locators, whatever the source. Resolution order:
+//
+// extendXPointerByLength advances a CRE xpointer's trailing text-node
+// character offset by the rune length of text, so a highlight with only a
+// start anchor still gets a plausible (non-collapsed) end for drawing.
+// Overshooting the node just clamps on the device.
+func extendXPointerByLength(xp, text string) string {
+	if xp == "" || text == "" {
+		return xp
+	}
+	i := strings.LastIndex(xp, ".")
+	if i < 0 {
+		return xp
+	}
+	off, err := strconv.Atoi(xp[i+1:])
+	if err != nil {
+		return xp
+	}
+	return xp[:i+1] + strconv.Itoa(off+utf8.RuneCountInString(text))
+}
+
+// KOReader paints highlight colors from a fixed set of names
+// (Blitbuffer.HIGHLIGHT_COLORS); the web reader uses hex swatches. Map at
+// the boundary so each side always receives something it can render;
+// unmappable values fall back to each side's default (yellow).
+var koreaderColorFromName = map[string]string{
+	"yellow": "#ffd54f",
+	"orange": "#ffd54f",
+	"green":  "#a5d6a7",
+	"olive":  "#a5d6a7",
+	"cyan":   "#90caf9",
+	"blue":   "#90caf9",
+	"purple": "#ce93d8",
+	"red":    "#f48fb1",
+}
+
+// mapColorFromKOReader normalizes a device color name to a web hex
+// swatch (default yellow) when ingesting device pushes.
+func mapColorFromKOReader(name string) string {
+	if hex, ok := koreaderColorFromName[strings.ToLower(strings.TrimSpace(name))]; ok {
+		return hex
+	}
+	return "#ffd54f"
+}
+
+var koreaderColorFromHex = map[string]string{
+	"#ffd54f": "yellow",
+	"#a5d6a7": "green",
+	"#90caf9": "blue",
+	"#ce93d8": "purple",
+	"#f48fb1": "purple",
+}
+
+// mapColorToKOReader normalizes a web hex swatch to the nearest KOReader
+// color name (default yellow) when serving to devices. Pink maps to purple
+// (the palette's closest); round-trip drift is prevented on the device by
+// suppressing echo colors for un-edited applied entries.
+func mapColorToKOReader(hex string) string {
+	if name, ok := koreaderColorFromHex[strings.ToLower(strings.TrimSpace(hex))]; ok {
+		return name
+	}
+	return "yellow"
+}
+
+//  1. A device-native CRE xpointer ("/body/...") in startPosition wins —
+//     round-trip identical for KOReader-pushed annotations (converting the
+//     stored CFI instead could drift and duplicate on the device).
+//  2. The web reader's PDF JSON anchor → bare page number (KOReader paging
+//     documents use the page number as pos0).
+//  3. A stored EPUB CFI (epubcfi_start, or startPosition without the
+//     reader's "cfi:" prefix) → converted to a CRE xpointer, with
+//     contextText (the selection text) enabling the text-search fallback.
+//  4. A "page:N" or bare-numeric position → the bare number.
+//
+// Returns "" when nothing usable exists; callers skip such annotations so
+// devices never receive locators they cannot place.
+func (h *KOReaderHandler) koreaderPos0(c *echo.Context, mediaItem database.MediaItems, startPosition, epubcfi, contextText string) string {
+	if wsync.IsCREXPointer(startPosition) {
+		return startPosition
+	}
+	if strings.HasPrefix(epubcfi, "{") {
+		var anchor pdfRectAnchor
+		if json.Unmarshal([]byte(epubcfi), &anchor) == nil && anchor.Page >= 0 {
+			return strconv.Itoa(anchor.Page)
+		}
+	}
+	cfi := epubcfi
+	if cfi == "" && strings.HasPrefix(startPosition, "cfi:") {
+		cfi = strings.TrimPrefix(startPosition, "cfi:")
+	}
+	if cfi != "" && wsync.IsStandardEPUBCFI(cfi) {
+		if converted := h.reverseConvertCFI(c, mediaItem, cfi, contextText); converted != "" {
+			return converted
+		}
+		// Conversion failed; fall through so numeric positions still work.
+		if wsync.IsCREXPointer(cfi) {
+			return cfi
+		}
+	}
+	if p := strings.TrimPrefix(startPosition, "page:"); p != "" && parsePageInt(p) >= 0 {
+		return p
+	}
+	return ""
+}
+
+func parsePageInt(s string) int64 {
+	var n int64
+	for _, r := range s {
+		if r < '0' || r > '9' {
+			return -1
+		}
+		n = n*10 + int64(r-'0')
+	}
+	return n
+}
+
 func (h *KOReaderHandler) GetLibrary(c *echo.Context) error {
 	device := c.Get("device").(database.Devices)
 	userID := device.UserID.Bytes
@@ -1195,13 +1582,13 @@ func (h *KOReaderHandler) SyncBookmarks(c *echo.Context) error {
 			endPos = startPos
 		}
 
-		color := "#ffff00"
+		color := "#ffd54f"
 		if highlight.Color != "" {
-			color = highlight.Color
+			color = mapColorFromKOReader(highlight.Color)
 		}
 
 		if h.annotationSvc != nil {
-			epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, highlight.Pos0, highlight.Pos1)
+			epubcfiStart, epubcfiEnd := h.convertHighlightPositions(ctx, mediaItemID, highlight.Pos0, highlight.Pos1, highlight.Text)
 
 			pctStart := 0.0
 			if highlight.Percentage != nil {

internal/handlers/koreader_test.go

@@ -0,0 +1,52 @@
+package handlers
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// The device pushes deletions as dedup-key arrays on the progress request.
+// Verify the wire shape the plugin sends (lua json.encode of
+// { deleted_highlights = { { dedup_key = "..." } } }) binds correctly.
+func TestKOReaderProgressRequest_DeletedAnnotationsBinding(t *testing.T) {
+	payload := `{
+		"books": [{
+			"sha256": "d1b1c6123d6206017b40798744ed994f00803b97d22ce51bea32e95e1ce7a164",
+			"title": "1984",
+			"percentage": 0.42,
+			"deleted_highlights": [
+				{ "dedup_key": "abc123" },
+				{ "dedup_key": "def456" }
+			],
+			"deleted_bookmarks": [
+				{ "dedup_key": "789xyz" }
+			]
+		}]
+	}`
+
+	var req KOReaderProgressRequest
+	err := json.Unmarshal([]byte(payload), &req)
+	assert.NoError(t, err)
+	assert.Len(t, req.Books, 1)
+
+	book := req.Books[0]
+	assert.Len(t, book.DeletedHighlights, 2)
+	assert.Equal(t, "abc123", book.DeletedHighlights[0].DedupKey)
+	assert.Equal(t, "def456", book.DeletedHighlights[1].DedupKey)
+	assert.Len(t, book.DeletedBookmarks, 1)
+	assert.Equal(t, "789xyz", book.DeletedBookmarks[0].DedupKey)
+}
+
+// A request without the arrays (older plugins) must bind with them empty —
+// deletion propagation is strictly opt-in per push.
+func TestKOReaderProgressRequest_DeletedAnnotationsOmitted(t *testing.T) {
+	payload := `{"books": [{"sha256": "x", "title": "t", "percentage": 0.1}]}`
+
+	var req KOReaderProgressRequest
+	err := json.Unmarshal([]byte(payload), &req)
+	assert.NoError(t, err)
+	assert.Empty(t, req.Books[0].DeletedHighlights)
+	assert.Empty(t, req.Books[0].DeletedBookmarks)
+}

internal/handlers/media.go

@@ -11,7 +11,6 @@ import (
 	"fmt"
 	"io"
 	"log"
-	"mime"
 	"mime/multipart"
 	"net/http"
 	"net/url"
@@ -191,55 +190,6 @@ func (mh *MediaHandler) SetAnnotationService(svc *wsync.AnnotationService) {
 	mh.annotationSvc = svc
 }
 
-func (h *MediaHandler) DownloadBook(c *echo.Context) error {
-	bookUUID, err := uuid.Parse(c.Param("uuid"))
-	if err != nil {
-		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid book UUID"})
-	}
-
-	pgBookUUID := pgtype.UUID{Bytes: bookUUID, Valid: true}
-
-	mediaItem, err := h.db.GetMediaItem(c.Request().Context(), pgBookUUID)
-	if err != nil {
-		return c.JSON(http.StatusNotFound, map[string]string{"error": "book not found"})
-	}
-
-	// Resolve relative path to absolute filesystem path
-	fullPath, err := h.getFullFilePath(c.Request().Context(), mediaItem.LibraryID, mediaItem.FilePath)
-	if err != nil {
-		return c.JSON(http.StatusNotFound, map[string]string{"error": "book file not found on disk"})
-	}
-
-	if _, err := os.Stat(fullPath); os.IsNotExist(err) {
-		return c.JSON(http.StatusNotFound, map[string]string{"error": "book file not found on disk"})
-	}
-
-	file, err := os.Open(fullPath)
-	if err != nil {
-		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to open book file"})
-	}
-	defer file.Close()
-
-	mimeType := mediaItem.MimeType.String
-	if !mediaItem.MimeType.Valid || mimeType == "" {
-		mimeType = mime.TypeByExtension(filepath.Ext(mediaItem.FilePath))
-	}
-
-	c.Response().Header().Set("Content-Type", mimeType)
-	c.Response().Header().Set("Content-Disposition", "attachment; filename=\""+filepath.Base(mediaItem.FilePath)+"\"")
-
-	if mediaItem.FileSize.Valid && mediaItem.FileSize.Int64 > 0 {
-		c.Response().Header().Set("Content-Length", strconv.FormatInt(mediaItem.FileSize.Int64, 10))
-	}
-
-	_, err = io.Copy(c.Response(), file)
-	if err != nil {
-		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to stream file"})
-	}
-
-	return nil
-}
-
 // ExecuteSearch performs search and returns results with count
 // Public wrapper for shared search logic used by both JSON and HTML endpoints
 func (h *MediaHandler) ExecuteSearch(ctx context.Context, params services.SearchParams) ([]database.SearchMediaItemsUnifiedRow, int, error) {
@@ -2073,30 +2023,86 @@ func (mh *MediaHandler) getFullFilePath(ctx context.Context, libraryID pgtype.UU
 	return mh.libraryService.ResolveMediaPath(ctx, libraryID, relativePath)
 }
 
-// ServeFile serves files (covers or books) via /uploads/library-{id}/path
-// Requires JWT authentication
+// ServeFile serves stored library files (covers and books).
+//
+// Two URL forms funnel into this handler:
+//
+//	/uploads/library-{libraryID}/{relativePath}   (covers, reader files)
+//	/api/media-items/{mediaItemID}/download       (explicit book download)
+//
+// Both require JWT authentication and that the authenticated user can see
+// the library owning the file - library visibility is the permission gate.
 func (mh *MediaHandler) ServeFile(c *echo.Context) error {
-	// URL format: /uploads/library-{libraryID}/{relativePath}
-	// Get library ID directly from route parameter
-	libraryIDStr := c.Param("id")
-	libraryUUID, err := uuid.Parse(libraryIDStr)
-	if err != nil {
-		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library ID"})
-	}
+	var libraryUUID pgtype.UUID
+	var relativePath string
 
-	// Get remaining path from URL
 	rawPath := c.Param("*")
-	relativePath, err := url.QueryUnescape(rawPath)
-	if err != nil {
-		relativePath = rawPath
+	if rawPath != "" {
+		// Path form: /uploads/library-{libraryID}/{relativePath}
+		libraryIDStr := c.Param("id")
+		parsed, err := uuid.Parse(libraryIDStr)
+		if err != nil {
+			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid library ID"})
+		}
+		libraryUUID = pgtype.UUID{Bytes: parsed, Valid: true}
+
+		relativePath, err = url.QueryUnescape(rawPath)
+		if err != nil {
+			relativePath = rawPath
+		}
+
+		if relativePath == "" {
+			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid path"})
+		}
+	} else {
+		// Item form: /api/media-items/{mediaItemID}/download
+		itemUUID, err := uuid.Parse(c.Param("id"))
+		if err != nil {
+			return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid media item ID"})
+		}
+
+		mediaItem, err := mh.db.GetMediaItem(c.Request().Context(), pgtype.UUID{Bytes: itemUUID, Valid: true})
+		if err != nil {
+			return c.JSON(http.StatusNotFound, map[string]string{"error": "book not found"})
+		}
+
+		if !mediaItem.LibraryID.Valid || mediaItem.FilePath == "" {
+			return c.JSON(http.StatusNotFound, map[string]string{"error": "book file not found"})
+		}
+
+		libraryUUID = mediaItem.LibraryID
+		relativePath = mediaItem.FilePath
+
+		// Explicit download endpoint: suggest saving instead of inline display.
+		filename := strings.Map(func(r rune) rune {
+			if r == '"' || r == '\\' || r == '/' {
+				return -1
+			}
+			return r
+		}, filepath.Base(relativePath))
+		c.Response().Header().Set("Content-Disposition", `attachment; filename="`+filename+`"`)
 	}
 
-	if relativePath == "" {
-		return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid path"})
+	// Library visibility gate: the library is what grants permission to
+	// see and download media.
+	user := c.Get("user").(database.Users)
+	visibleLibraries, err := mh.libraryService.GetUserVisibleLibraries(c.Request().Context(), user.ID)
+	if err != nil {
+		return c.JSON(http.StatusInternalServerError, map[string]string{"error": "failed to check library access"})
+	}
+	libraryVisible := false
+	for _, lib := range visibleLibraries {
+		if lib.ID.Valid && lib.ID.Bytes == libraryUUID.Bytes {
+			libraryVisible = true
+			break
+		}
+	}
+	if !libraryVisible {
+		return c.JSON(http.StatusForbidden, map[string]string{"error": "library not accessible"})
 	}
 
 	// Resolve using service
-	fullPath, err := mh.getFullFilePath(c.Request().Context(), pgtype.UUID{Bytes: libraryUUID, Valid: true}, relativePath)
+	fullPath, err := mh.getFullFilePath(c.Request().Context(), libraryUUID, relativePath)
 	if err != nil {
 		return c.JSON(http.StatusNotFound, map[string]string{"error": "file not found"})
 	}

internal/handlers/media_detail.go

@@ -18,4 +18,8 @@ type MediaDetail struct {
 	// Computed counts
 	NotesCount      int `json:"notes_count"`
 	HighlightsCount int `json:"highlights_count"`
+
+	// Deleted-annotation history (tombstoned rows, newest first) — the book
+	// page's "recently deleted" list with restore/permanent-delete actions.
+	DeletedAnnotations []DeletedAnnotationResponse `json:"deleted_annotations"`
 }

internal/router/frontend.go

@@ -1329,13 +1329,14 @@ func registerFrontendRoutes(cfg *Config) {
 
 		// Assemble response (no field duplication!)
 		detail := handlers.MediaDetail{
-			MediaItems:      mediaItem, // Embedded - ALL fields available
-			Rating:          rating,
-			Collections:     collections,
-			ReadingProgress: progress,
-			ActiveConflict:  activeConflict,
-			NotesCount:      len(notes),
-			HighlightsCount: len(highlights),
+			MediaItems:         mediaItem, // Embedded - ALL fields available
+			Rating:             rating,
+			Collections:        collections,
+			ReadingProgress:    progress,
+			ActiveConflict:     activeConflict,
+			NotesCount:         len(notes),
+			HighlightsCount:    len(highlights),
+			DeletedAnnotations: handlers.DeletedAnnotationsForBook(c.Request().Context(), cfg.Queries, pgUserID, pgMediaUUID),
 		}
 
 		// Render template

internal/router/media.go

@@ -15,6 +15,9 @@ func registerMediaRoutes(cfg *Config) {
 	// Media item routes (all authenticated users)
 	protected.GET("/media-items", cfg.MediaHandler.ListMediaItems)
 	protected.GET("/media-items/:id", cfg.MediaHandler.GetMediaItem)
+	// Book download endpoint - same ServeFile flow as /uploads/library-:id/*
+	// (JWT + library-visibility gated), addressed by media item ID.
+	protected.GET("/media-items/:id/download", cfg.MediaHandler.ServeFile)
 
 	// Media rating routes (all authenticated users)
 	protected.POST("/media-items/:id/rating", cfg.MediaHandler.CreateMediaRating)
@@ -47,6 +50,13 @@ func registerMediaRoutes(cfg *Config) {
 	protected.PUT("/media-items/:id/bookmarks/:bookmarkId", cfg.MediaHandler.UpdateMediaBookmark)
 	protected.DELETE("/media-items/:id/bookmarks/:bookmarkId", cfg.MediaHandler.DeleteMediaBookmark)
 
+	// Deleted-annotation history (all authenticated users): tombstoned
+	// highlights/notes/bookmarks restorable or permanently removable from the
+	// book page's "recently deleted" list.
+	protected.GET("/media-items/:id/annotations/deleted", cfg.MediaHandler.GetDeletedAnnotations)
+	protected.POST("/media-items/:id/annotations/:annotationId/restore", cfg.MediaHandler.RestoreDeletedAnnotation)
+	protected.DELETE("/media-items/:id/annotations/:annotationId", cfg.MediaHandler.PurgeDeletedAnnotation)
+
 	// Admin-only media routes
 	admin.POST("/media-items", cfg.MediaHandler.CreateMediaItem)
 	admin.PUT("/media-items/:id", cfg.MediaHandler.UpdateMediaItem)

internal/router/sync.go

@@ -24,6 +24,7 @@ func registerSyncRoutes(cfg *Config) {
 	// KOReader sync routes (device authentication required)
 	koreaderSync := e.Group("/api/sync/koreader")
 	koreaderSync.POST("/progress", cfg.DeviceAuthMiddleware.Authenticate(cfg.KOReaderHandler.SyncProgress))
+	koreaderSync.GET("/resolve", cfg.DeviceAuthMiddleware.Authenticate(cfg.KOReaderHandler.ResolveBook))
 	koreaderSync.GET("/metadata/:uuid", cfg.DeviceAuthMiddleware.Authenticate(cfg.KOReaderHandler.GetMetadata))
 	koreaderSync.GET("/library", cfg.DeviceAuthMiddleware.Authenticate(cfg.KOReaderHandler.GetLibrary))
 	koreaderSync.POST("/bookmarks", cfg.DeviceAuthMiddleware.Authenticate(cfg.KOReaderHandler.SyncBookmarks))

internal/sync/annotations.go

@@ -23,8 +23,8 @@ import (
 const TombstoneTTL = 30 * 24 * time.Hour
 
 type AnnotationService struct {
-	db      *database.Queries
-	connMgr *ConnectionManager
+	db       *database.Queries
+	connMgr  *ConnectionManager
 	settings *database.SettingsRegistry
 }
 
@@ -75,6 +75,11 @@ type SaveHighlightRequest struct {
 	Source           string
 	ModifiedAt       time.Time
 	DeviceSyncData   json.RawMessage
+	// DedupKey overrides the computed key when the client echoes back an
+	// annotation it received from us (device echoes carry device-native
+	// locators, so the computed key would never match the original row and
+	// every pull→push cycle would mint a duplicate).
+	DedupKey string
 }
 
 type SaveHighlightResult struct {
@@ -84,7 +89,10 @@ type SaveHighlightResult struct {
 }
 
 func (s *AnnotationService) SaveHighlight(ctx context.Context, req SaveHighlightRequest) (*SaveHighlightResult, error) {
-	dedupKey := ComputeDedupKey(req.SelectionText, req.EpubcfiStart, req.StartPosition)
+	dedupKey := req.DedupKey
+	if dedupKey == "" {
+		dedupKey = ComputeDedupKey(req.SelectionText, req.EpubcfiStart, req.StartPosition)
+	}
 
 	existing, err := s.db.GetMediaHighlightByDedupKey(ctx, database.GetMediaHighlightByDedupKeyParams{
 		UserID:      req.UserID,
@@ -124,22 +132,22 @@ func (s *AnnotationService) createHighlight(
 	deviceData := mergeDeviceSyncData(nil, req.Source, req.DeviceSyncData)
 
 	highlight, err := s.db.CreateMediaHighlightFull(ctx, database.CreateMediaHighlightFullParams{
-		MediaItemID:      req.MediaItemID,
-		UserID:           req.UserID,
-		SelectionText:    req.SelectionText,
-		StartPosition:    pgText(req.StartPosition),
-		EndPosition:      pgText(req.EndPosition),
-		Color:            pgText(req.Color),
-		NoteText:         pgText(req.NoteText),
-		PercentageStart:  pgFloat8(req.PercentageStart),
-		PercentageEnd:    pgFloat8(req.PercentageEnd),
-		EpubcfiStart:     pgText(req.EpubcfiStart),
-		EpubcfiEnd:       pgText(req.EpubcfiEnd),
-		ChapterReference: pgInt4(req.ChapterReference),
-		DedupKey:         pgtype.Text{String: dedupKey, Valid: true},
-		LastModifiedAt:   pgtype.Timestamptz{Time: modifiedAt, Valid: true},
+		MediaItemID:        req.MediaItemID,
+		UserID:             req.UserID,
+		SelectionText:      req.SelectionText,
+		StartPosition:      pgText(req.StartPosition),
+		EndPosition:        pgText(req.EndPosition),
+		Color:              pgText(req.Color),
+		NoteText:           pgText(req.NoteText),
+		PercentageStart:    pgFloat8(req.PercentageStart),
+		PercentageEnd:      pgFloat8(req.PercentageEnd),
+		EpubcfiStart:       pgText(req.EpubcfiStart),
+		EpubcfiEnd:         pgText(req.EpubcfiEnd),
+		ChapterReference:   pgInt4(req.ChapterReference),
+		DedupKey:           pgtype.Text{String: dedupKey, Valid: true},
+		LastModifiedAt:     pgtype.Timestamptz{Time: modifiedAt, Valid: true},
 		LastModifiedSource: pgtype.Text{String: req.Source, Valid: req.Source != ""},
-		DeviceSyncData:   deviceData,
+		DeviceSyncData:     deviceData,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("create highlight: %w", err)
@@ -179,20 +187,20 @@ func (s *AnnotationService) applyLWW(
 	deviceData := mergeDeviceSyncData(existing.DeviceSyncData, req.Source, req.DeviceSyncData)
 
 	highlight, err := s.db.UpdateMediaHighlightForSync(ctx, database.UpdateMediaHighlightForSyncParams{
-		ID:               existing.ID,
-		SelectionText:    req.SelectionText,
-		StartPosition:    pgText(req.StartPosition),
-		EndPosition:      pgText(req.EndPosition),
-		Color:            pgText(req.Color),
-		NoteText:         pgText(req.NoteText),
-		PercentageStart:  pgFloat8(req.PercentageStart),
-		PercentageEnd:    pgFloat8(req.PercentageEnd),
-		EpubcfiStart:     pgText(req.EpubcfiStart),
-		EpubcfiEnd:       pgText(req.EpubcfiEnd),
-		ChapterReference: pgInt4(req.ChapterReference),
-		LastModifiedAt:   pgtype.Timestamptz{Time: modifiedAt, Valid: true},
+		ID:                 existing.ID,
+		SelectionText:      req.SelectionText,
+		StartPosition:      pgText(req.StartPosition),
+		EndPosition:        pgText(req.EndPosition),
+		Color:              pgText(req.Color),
+		NoteText:           pgText(req.NoteText),
+		PercentageStart:    pgFloat8(req.PercentageStart),
+		PercentageEnd:      pgFloat8(req.PercentageEnd),
+		EpubcfiStart:       pgText(req.EpubcfiStart),
+		EpubcfiEnd:         pgText(req.EpubcfiEnd),
+		ChapterReference:   pgInt4(req.ChapterReference),
+		LastModifiedAt:     pgtype.Timestamptz{Time: modifiedAt, Valid: true},
 		LastModifiedSource: pgtype.Text{String: req.Source, Valid: req.Source != ""},
-		DeviceSyncData:   deviceData,
+		DeviceSyncData:     deviceData,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("update highlight: %w", err)
@@ -260,6 +268,99 @@ func (s *AnnotationService) TombstoneHighlightByID(
 	return nil
 }
 
+// TombstoneBookmarkByDedupKey soft-deletes a bookmark by its dedup key — the
+// device-sync counterpart of TombstoneHighlight. Devices report deletions by
+// dedup key (they have no row IDs), so this keeps bookmark delete propagation
+// symmetric with highlights.
+func (s *AnnotationService) TombstoneBookmarkByDedupKey(
+	ctx context.Context,
+	userID, mediaItemID pgtype.UUID,
+	dedupKey string,
+	source string,
+) error {
+	if dedupKey == "" {
+		return nil
+	}
+	err := s.db.TombstoneMediaBookmarkByDedupKey(ctx, database.TombstoneMediaBookmarkByDedupKeyParams{
+		UserID:      userID,
+		MediaItemID: mediaItemID,
+		DedupKey:    pgtype.Text{String: dedupKey, Valid: true},
+	})
+	if err != nil {
+		return fmt.Errorf("tombstone bookmark: %w", err)
+	}
+	s.broadcast(pgtype.UUID{}, userID, mediaItemID, "bookmark_delete", source)
+	return nil
+}
+
+// ValidAnnotationKind reports whether kind is one of the annotation types
+// accepted by the history restore/purge endpoints.
+func ValidAnnotationKind(kind string) bool {
+	return kind == "highlight" || kind == "note" || kind == "bookmark"
+}
+
+// RestoreAnnotationByID clears the tombstone on a deleted annotation,
+// returning it to the active set. The row itself was never removed, so
+// restoration is lossless. Returns false when no matching deleted annotation
+// exists (wrong owner, wrong book, or not actually deleted).
+func (s *AnnotationService) RestoreAnnotationByID(
+	ctx context.Context,
+	kind string,
+	userID, mediaItemID, annotationID pgtype.UUID,
+) (bool, error) {
+	var rows int64
+	var err error
+	switch kind {
+	case "highlight":
+		rows, err = s.db.RestoreMediaHighlightByID(ctx, database.RestoreMediaHighlightByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	case "note":
+		rows, err = s.db.RestoreMediaNoteByID(ctx, database.RestoreMediaNoteByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	case "bookmark":
+		rows, err = s.db.RestoreMediaBookmarkByID(ctx, database.RestoreMediaBookmarkByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	default:
+		return false, fmt.Errorf("unknown annotation kind: %s", kind)
+	}
+	if err != nil {
+		return false, fmt.Errorf("restore %s: %w", kind, err)
+	}
+	if rows > 0 {
+		s.broadcast(annotationID, userID, mediaItemID, kind, "web")
+	}
+	return rows > 0, nil
+}
+
+// PurgeAnnotationByID permanently deletes an already-tombstoned annotation
+// from the history. Unlike a tombstone this is irreversible; the TTL-driven
+// maintenance sweep does the same thing to old tombstones eventually.
+func (s *AnnotationService) PurgeAnnotationByID(
+	ctx context.Context,
+	kind string,
+	userID, mediaItemID, annotationID pgtype.UUID,
+) (bool, error) {
+	var rows int64
+	var err error
+	switch kind {
+	case "highlight":
+		rows, err = s.db.PurgeMediaHighlightByID(ctx, database.PurgeMediaHighlightByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	case "note":
+		rows, err = s.db.PurgeMediaNoteByID(ctx, database.PurgeMediaNoteByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	case "bookmark":
+		rows, err = s.db.PurgeMediaBookmarkByID(ctx, database.PurgeMediaBookmarkByIDParams{
+			ID: annotationID, UserID: userID, MediaItemID: mediaItemID})
+	default:
+		return false, fmt.Errorf("unknown annotation kind: %s", kind)
+	}
+	if err != nil {
+		return false, fmt.Errorf("purge %s: %w", kind, err)
+	}
+	return rows > 0, nil
+}
+
 func (s *AnnotationService) PurgeExpiredTombstones(ctx context.Context) error {
 	cutoff := pgtype.Timestamptz{Time: time.Now().Add(-s.tombstoneTTL()), Valid: true}
 	if err := s.db.PurgeExpiredHighlightTombstones(ctx, cutoff); err != nil {
@@ -335,6 +436,7 @@ type SaveNoteRequest struct {
 	Source             string
 	ModifiedAt         time.Time
 	DeviceSyncData     []byte
+	DedupKey           string // overrides the computed key for device echoes
 }
 
 type SaveNoteResult struct {
@@ -348,7 +450,10 @@ func (s *AnnotationService) SaveNote(ctx context.Context, req SaveNoteRequest) (
 		return nil, errors.New("invalid user_id or media_item_id")
 	}
 
-	dedupKey := ComputeDedupKey(req.Content, req.EpubcfiLocation, req.Position)
+	dedupKey := req.DedupKey
+	if dedupKey == "" {
+		dedupKey = ComputeDedupKey(req.Content, req.EpubcfiLocation, req.Position)
+	}
 
 	existing, err := s.db.GetMediaNoteByDedupKey(ctx, database.GetMediaNoteByDedupKeyParams{
 		UserID:      req.UserID,
@@ -485,6 +590,9 @@ type SaveBookmarkRequest struct {
 	Source           string
 	ModifiedAt       time.Time
 	DeviceSyncData   json.RawMessage
+	// DedupKey overrides the computed key for device echoes (see
+	// SaveHighlightRequest).
+	DedupKey string
 }
 
 type SaveBookmarkResult struct {
@@ -494,7 +602,10 @@ type SaveBookmarkResult struct {
 }
 
 func (s *AnnotationService) SaveBookmark(ctx context.Context, req SaveBookmarkRequest) (*SaveBookmarkResult, error) {
-	dedupKey := ComputeDedupKey(req.Title, req.EpubcfiLocation, req.Position)
+	dedupKey := req.DedupKey
+	if dedupKey == "" {
+		dedupKey = ComputeDedupKey(req.Title, req.EpubcfiLocation, req.Position)
+	}
 
 	existing, err := s.db.GetMediaBookmarkByDedupKey(ctx, database.GetMediaBookmarkByDedupKeyParams{
 		UserID:      req.UserID,
@@ -530,21 +641,21 @@ func (s *AnnotationService) createBookmark(ctx context.Context, req SaveBookmark
 	deviceData := mergeDeviceSyncData(nil, req.Source, req.DeviceSyncData)
 
 	bm, err := s.db.CreateMediaBookmarkFull(ctx, database.CreateMediaBookmarkFullParams{
-		MediaItemID:      req.MediaItemID,
-		UserID:           req.UserID,
-		PageNumber:       pgInt4(req.PageNumber),
-		ChapterNumber:    pgInt4(req.ChapterNumber),
-		CfiPosition:      pgText(req.CFIPosition),
-		Title:            req.Title,
-		Position:         pgText(req.Position),
-		Notes:            pgText(req.Notes),
+		MediaItemID:        req.MediaItemID,
+		UserID:             req.UserID,
+		PageNumber:         pgInt4(req.PageNumber),
+		ChapterNumber:      pgInt4(req.ChapterNumber),
+		CfiPosition:        pgText(req.CFIPosition),
+		Title:              req.Title,
+		Position:           pgText(req.Position),
+		Notes:              pgText(req.Notes),
 		PercentageLocation: pgFloat8(req.PercentageLoc),
-		EpubcfiLocation:  pgText(req.EpubcfiLocation),
-		ChapterReference: pgInt4(req.ChapterReference),
-		DedupKey:         pgtype.Text{String: dedupKey, Valid: true},
-		LastModifiedAt:   pgtype.Timestamptz{Time: modifiedAt, Valid: true},
+		EpubcfiLocation:    pgText(req.EpubcfiLocation),
+		ChapterReference:   pgInt4(req.ChapterReference),
+		DedupKey:           pgtype.Text{String: dedupKey, Valid: true},
+		LastModifiedAt:     pgtype.Timestamptz{Time: modifiedAt, Valid: true},
 		LastModifiedSource: pgtype.Text{String: req.Source, Valid: req.Source != ""},
-		DeviceSyncData:   deviceData,
+		DeviceSyncData:     deviceData,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("create bookmark: %w", err)
@@ -573,19 +684,19 @@ func (s *AnnotationService) applyBookmarkLWW(ctx context.Context, req SaveBookma
 	deviceData := mergeDeviceSyncData(existing.DeviceSyncData, req.Source, req.DeviceSyncData)
 
 	bm, err := s.db.UpdateMediaBookmarkForSync(ctx, database.UpdateMediaBookmarkForSyncParams{
-		ID:               existing.ID,
-		PageNumber:       pgInt4(req.PageNumber),
-		ChapterNumber:    pgInt4(req.ChapterNumber),
-		CfiPosition:      pgText(req.CFIPosition),
-		Title:            req.Title,
-		Position:         pgText(req.Position),
-		Notes:            pgText(req.Notes),
+		ID:                 existing.ID,
+		PageNumber:         pgInt4(req.PageNumber),
+		ChapterNumber:      pgInt4(req.ChapterNumber),
+		CfiPosition:        pgText(req.CFIPosition),
+		Title:              req.Title,
+		Position:           pgText(req.Position),
+		Notes:              pgText(req.Notes),
 		PercentageLocation: pgFloat8(req.PercentageLoc),
-		EpubcfiLocation:  pgText(req.EpubcfiLocation),
-		ChapterReference: pgInt4(req.ChapterReference),
-		LastModifiedAt:   pgtype.Timestamptz{Time: modifiedAt, Valid: true},
+		EpubcfiLocation:    pgText(req.EpubcfiLocation),
+		ChapterReference:   pgInt4(req.ChapterReference),
+		LastModifiedAt:     pgtype.Timestamptz{Time: modifiedAt, Valid: true},
 		LastModifiedSource: pgtype.Text{String: req.Source, Valid: req.Source != ""},
-		DeviceSyncData:   deviceData,
+		DeviceSyncData:     deviceData,
 	})
 	if err != nil {
 		return nil, fmt.Errorf("update bookmark: %w", err)

internal/sync/cfi_converter.go

@@ -11,6 +11,7 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+	"sync"
 	"unicode/utf8"
 
 	"golang.org/x/net/html"
@@ -19,6 +20,9 @@ import (
 type CFIConverter struct {
 	epubPath string
 	cache    *spineCache
+	// mu guards the lazily-built spine/doc caches: converter instances are
+	// shared across concurrent requests via the package cache in locators.go.
+	mu sync.Mutex
 }
 
 type spineItem struct {
@@ -37,6 +41,8 @@ func NewCFIConverter(epubPath string) *CFIConverter {
 }
 
 func (c *CFIConverter) loadSpine() (*spineCache, error) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	if c.cache != nil {
 		return c.cache, nil
 	}
@@ -94,6 +100,8 @@ func (c *CFIConverter) getContentDoc(fragmentIndex int) (*html.Node, string, err
 	item := spine.items[spineIndex]
 	href := item.href
 
+	c.mu.Lock()
+	defer c.mu.Unlock()
 	if cached, ok := spine.docCache[href]; ok {
 		return cached, href, nil
 	}
@@ -243,6 +251,46 @@ type ConversionResult struct {
 	Precision  string
 }
 
+// SectionPercentage derives an approximate book-wide percentage for a CRE
+// xpointer from the char distribution across the spine: the midpoint of the
+// document it points into. Precision is per-section, which is what
+// percentage_start is used for (ordering/filtering) — and it lets thin
+// clients skip their own per-annotation page lookups entirely.
+func (c *CFIConverter) SectionPercentage(xpointer string) float64 {
+	xp, err := ParseCREXPointer(xpointer)
+	if err != nil {
+		return 0
+	}
+	spine, err := c.loadSpine()
+	if err != nil {
+		return 0
+	}
+	total := 0
+	charCounts := make([]int, len(spine.items))
+	for i := range spine.items {
+		doc, _, docErr := c.getContentDoc(i + 1)
+		if docErr != nil {
+			continue
+		}
+		if b := findBody(doc); b != nil {
+			charCounts[i] = countTextChars(b)
+			total += charCounts[i]
+		}
+	}
+	if total <= 0 {
+		return 0
+	}
+	idx := xp.FragmentIndex - 1
+	if idx < 0 || idx >= len(spine.items) {
+		return 0
+	}
+	before := 0
+	for i := 0; i < idx; i++ {
+		before += charCounts[i]
+	}
+	return (float64(before) + float64(charCounts[idx])/2) / float64(total)
+}
+
 func (c *CFIConverter) ConvertCREToStandard(xpointer string, storedPercentage float64, contextText string) (*ConversionResult, error) {
 	if IsCREFragmentID(xpointer) {
 		return c.convertFragmentID(xpointer, storedPercentage)
@@ -884,8 +932,8 @@ func readZipFile(zr *zip.Reader, name string) ([]byte, error) {
 }
 
 type opfContainer struct {
-	XMLName   xml.Name   `xml:"container"`
-	RootFiles []opfRoot  `xml:"rootfiles>rootfile"`
+	XMLName   xml.Name  `xml:"container"`
+	RootFiles []opfRoot `xml:"rootfiles>rootfile"`
 }
 
 type opfRoot struct {
@@ -906,8 +954,8 @@ func extractOPFPath(data []byte) (string, error) {
 }
 
 type xmlPackage struct {
-	XMLName xml.Name `xml:"package"`
-	Spine   xmlSpine `xml:"spine"`
+	XMLName  xml.Name    `xml:"package"`
+	Spine    xmlSpine    `xml:"spine"`
 	Manifest xmlManifest `xml:"manifest"`
 }
 
@@ -1036,9 +1084,9 @@ func preprocessXHTML(input string) string {
 }
 
 type cfiStep struct {
-	Index    int
-	ID       string
-	Offset   int
+	Index     int
+	ID        string
+	Offset    int
 	HasOffset bool
 }
 

internal/sync/cfi_converter_test.go

@@ -1,6 +1,8 @@
 package sync
 
 import (
+	"archive/zip"
+	"os"
 	"strings"
 	"testing"
 
@@ -9,7 +11,7 @@ import (
 
 func TestParseCREXPointer(t *testing.T) {
 	tests := []struct {
-		input   string
+		input    string
 		wantFrag int
 		wantPath int
 		wantChar int
@@ -72,9 +74,9 @@ func TestIsCREFragmentID(t *testing.T) {
 
 func TestParseCREFragmentID(t *testing.T) {
 	tests := []struct {
-		input       string
-		wantSpine   int
-		wantAnchor  string
+		input      string
+		wantSpine  int
+		wantAnchor string
 	}{
 		{"#_doc_fragment_5_ link2HCH0002", 5, "link2HCH0002"},
 		{"#_doc_fragment_0_", 0, ""},
@@ -116,57 +118,224 @@ func TestIsStandardEPUBCFI(t *testing.T) {
 	}
 }
 
-func TestConvert1984(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/George Orwell/1984 (126)/1984 - George Orwell.epub"
-	c := NewCFIConverter(epubPath)
+// writeTestEPUB builds a minimal, deterministic EPUB in a temp dir so the
+// conversion tests exercise the real zip→OPF→spine→document pipeline
+// without depending on books in a particular machine's uploads/ tree.
+//
+// Spine: doc1..doc6. doc2 carries the Dashwood sentence used for exact and
+// text-search anchoring; doc6 has an id anchor for fragment-ID conversion.
+func writeTestEPUB(t *testing.T) string {
+	t.Helper()
 
-	xp := "/body/DocFragment[2]/body/div/p[5]/text().500"
-	result, err := c.ConvertCREToStandard(xp, 0.01, "")
+	type spineDoc struct {
+		name string
+		body string
+	}
+	docs := []spineDoc{
+		{"doc1.xhtml", "<body><div><p>Chapter one opening page.</p></div></body>"},
+		{"doc2.xhtml", "<body><div><p>The family of Dashwood had long been settled in Sussex.</p><p>Their estate was large, and their residence was at Norland Park.</p></div></body>"},
+		{"doc3.xhtml", "<body><div><p>Chapter three contents.</p></div></body>"},
+		{"doc4.xhtml", "<body><div><p>Chapter four contents.</p></div></body>"},
+		{"doc5.xhtml", "<body><div><p>Chapter five contents.</p></div></body>"},
+		{"doc6.xhtml", "<body><div><p id=\"link2HCH0002\">He was neither fit to be a husband nor a father.</p></div></body>"},
+	}
+
+	containerXML := `<?xml version="1.0"?>
+<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
+  <rootfiles>
+    <rootfile full-path="OEBPS/content.opf" media-type="application/oebps-package+xml"/>
+  </rootfiles>
+</container>`
+
+	manifest := ""
+	spineRefs := ""
+	for _, d := range docs {
+		id := d.name[:len(d.name)-len(".xhtml")]
+		manifest += "    <item id=\"" + id + "\" href=\"" + d.name + "\" media-type=\"application/xhtml+xml\"/>\n"
+		spineRefs += "    <itemref idref=\"" + id + "\"/>\n"
+	}
+	opf := `<?xml version="1.0" encoding="UTF-8"?>
+<package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="uid">
+  <metadata xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <dc:identifier id="uid">test-bookhoard-fixture</dc:identifier>
+    <dc:title>Fixture</dc:title>
+  </metadata>
+  <manifest>
+` + manifest + `  </manifest>
+  <spine>
+` + spineRefs + `  </spine>
+</package>`
+
+	path := t.TempDir() + "/fixture.epub"
+	f, err := os.Create(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	zw := zip.NewWriter(f)
+	write := func(name, content string) {
+		w, err := zw.Create(name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if _, err := w.Write([]byte(content)); err != nil {
+			t.Fatal(err)
+		}
+	}
+	write("META-INF/container.xml", containerXML)
+	write("OEBPS/content.opf", opf)
+	for _, d := range docs {
+		write("OEBPS/"+d.name, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<html xmlns=\"http://www.w3.org/1999/xhtml\">"+d.body+"</html>\n")
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatal(err)
+	}
+	return path
+}
+
+const fixtureSentence = "The family of Dashwood had long been settled in Sussex."
+
+func TestConvertXPointerToCFI(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
+
+	xp := "/body/DocFragment[2]/body/div[1]/p[1]/text().10"
+	result, err := c.ConvertCREToStandard(xp, 0.05, "")
 	if err != nil {
 		t.Fatalf("ConvertCREToStandard error: %v", err)
 	}
 	t.Logf("Input: %s", xp)
 	t.Logf("EPUBCFI: %s", result.EPUBCFI)
-	t.Logf("Href: %s", result.Href)
 	t.Logf("Precision: %s", result.Precision)
-	t.Logf("Percentage: %.4f", result.Percentage)
 
 	if result.Precision == "percentage" {
 		t.Error("expected better than percentage precision")
 	}
+	if result.EPUBCFI == "" {
+		t.Error("expected non-empty epubcfi")
+	}
 }
 
-func TestConvertCrimeAndPunishmentFragmentID(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/Fyodor Dostoyevsky/Crime and Punishment (103)/Crime and Punishment - Fyodor Dostoyevsky.epub"
-	c := NewCFIConverter(epubPath)
+func TestConvertFragmentID(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
 
-	xp := "#_doc_fragment_5_ link2HCH0002"
-	result, err := c.ConvertCREToStandard(xp, 0.0303, "")
+	frag := "#_doc_fragment_5_ link2HCH0002"
+	result, err := c.ConvertCREToStandard(frag, 0.9, "")
 	if err != nil {
 		t.Fatalf("ConvertCREToStandard error: %v", err)
 	}
-	t.Logf("Input: %s", xp)
-	t.Logf("EPUBCFI: %s", result.EPUBCFI)
+	t.Logf("Input: %s", frag)
 	t.Logf("Href: %s", result.Href)
 	t.Logf("Precision: %s", result.Precision)
-	t.Logf("Percentage: %.4f", result.Percentage)
 
-	if result.Precision == "percentage" {
-		t.Error("expected better than percentage precision")
+	if result.Precision != "element" {
+		t.Errorf("expected element precision, got %s", result.Precision)
 	}
 	if result.Href == "" {
 		t.Error("expected non-empty href")
 	}
-	if result.Precision != "element" {
-		t.Errorf("expected element precision, got %s", result.Precision)
+	if !strings.Contains(result.Href, "doc6.xhtml#link2HCH0002") {
+		t.Errorf("expected doc6.xhtml#link2HCH0002 href, got %s", result.Href)
 	}
 }
 
+func TestRoundTripXPointer(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
+
+	originalXP := "/body/DocFragment[2]/body/div[1]/p[1]/text().10"
+	forward, err := c.ConvertCREToStandard(originalXP, 0.05, "")
+	if err != nil {
+		t.Fatalf("forward conversion error: %v", err)
+	}
+	if forward.EPUBCFI == "" {
+		t.Fatal("forward conversion produced empty epubcfi")
+	}
+	t.Logf("Forward: %s → %s", originalXP, forward.EPUBCFI)
+
+	reverse, err := c.ConvertStandardToCRE(forward.EPUBCFI, forward.Percentage, "")
+	if err != nil {
+		t.Fatalf("reverse conversion error: %v", err)
+	}
+	if reverse.XPointer == "" {
+		t.Fatal("reverse conversion produced empty XPointer")
+	}
+	t.Logf("Reverse: %s → %s", forward.EPUBCFI, reverse.XPointer)
+
+	if reverse.Precision != "exact" {
+		t.Errorf("expected exact precision, got %s", reverse.Precision)
+	}
+}
+
+func TestRoundTripWithContextText(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
+
+	originalXP := "/body/DocFragment[2]/body/div[1]/p[2]/text().3"
+	forward, err := c.ConvertCREToStandard(originalXP, 0.06, fixtureSentence)
+	if err != nil {
+		t.Fatalf("forward conversion error: %v", err)
+	}
+	if forward.EPUBCFI == "" {
+		t.Fatal("forward conversion produced empty epubcfi")
+	}
+	t.Logf("Forward: %s → %s", originalXP, forward.EPUBCFI)
+
+	reverse, err := c.ConvertStandardToCRE(forward.EPUBCFI, forward.Percentage, fixtureSentence)
+	if err != nil {
+		t.Fatalf("reverse conversion error: %v", err)
+	}
+	if reverse.XPointer == "" {
+		t.Fatal("reverse conversion produced empty XPointer")
+	}
+	t.Logf("Reverse: %s → %s", forward.EPUBCFI, reverse.XPointer)
+
+	if reverse.Precision != "exact" {
+		t.Errorf("expected exact precision, got %s", reverse.Precision)
+	}
+}
+
+func TestReverseTextSearchFallback(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
+
+	// Unresolvable steps in a CFI that still parses to spine doc2
+	// (spine index 1): the text search must anchor on the sentence.
+	reverse, err := c.ConvertStandardToCRE("epubcfi(/6/4!/4/99999/1:0)", 0.05, fixtureSentence)
+	if err != nil {
+		t.Fatalf("reverse conversion error: %v", err)
+	}
+	t.Logf("Text search fallback XPointer: %s", reverse.XPointer)
+	t.Logf("Precision: %s", reverse.Precision)
+
+	if reverse.Precision != "exact" {
+		t.Errorf("expected exact precision from text search, got %s", reverse.Precision)
+	}
+	if reverse.XPointer == "" {
+		t.Error("expected non-empty XPointer from text search")
+	}
+	if !strings.Contains(reverse.XPointer, "DocFragment[2]") {
+		t.Errorf("expected fallback into DocFragment[2], got %s", reverse.XPointer)
+	}
+}
+
+func TestReversePercentageFallback(t *testing.T) {
+	c := NewCFIConverter(writeTestEPUB(t))
+
+	reverse, err := c.ConvertStandardToCRE("epubcfi(/6/4!/4/99999/1:0)", 0.5, "")
+	if err != nil {
+		t.Fatalf("reverse conversion error: %v", err)
+	}
+	t.Logf("Percentage fallback precision: %s", reverse.Precision)
+
+	if reverse.Precision != "percentage" {
+		t.Errorf("expected percentage precision, got %s with XPointer %s", reverse.Precision, reverse.XPointer)
+	}
+	if reverse.XPointer != "" {
+		t.Error("expected empty XPointer for percentage fallback")
+	}
+}
 func TestParseEPUBCFI(t *testing.T) {
 	tests := []struct {
-		input      string
-		wantSpine  int
-		wantSteps  int
+		input     string
+		wantSpine int
+		wantSteps int
 	}{
 		{"epubcfi(/6/12!/4/2/90/1:7)", 5, 4},
 		{"epubcfi(/6/4!/4/2/1:0)", 1, 3},
@@ -213,103 +382,6 @@ func TestParseEPUBCFIInvalid(t *testing.T) {
 	}
 }
 
-func TestRoundTrip1984(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/George Orwell/1984 (126)/1984 - George Orwell.epub"
-	c := NewCFIConverter(epubPath)
-
-	originalXP := "/body/DocFragment[2]/body/div/p[5]/text().500"
-	forward, err := c.ConvertCREToStandard(originalXP, 0.01, "")
-	if err != nil {
-		t.Fatalf("forward conversion error: %v", err)
-	}
-	if forward.EPUBCFI == "" {
-		t.Fatal("forward conversion produced empty epubcfi")
-	}
-	t.Logf("Forward: %s → %s", originalXP, forward.EPUBCFI)
-
-	reverse, err := c.ConvertStandardToCRE(forward.EPUBCFI, forward.Percentage, "")
-	if err != nil {
-		t.Fatalf("reverse conversion error: %v", err)
-	}
-	if reverse.XPointer == "" {
-		t.Fatal("reverse conversion produced empty XPointer")
-	}
-	t.Logf("Reverse: %s → %s", forward.EPUBCFI, reverse.XPointer)
-	t.Logf("Reverse precision: %s", reverse.Precision)
-
-	if reverse.Precision != "exact" {
-		t.Errorf("expected exact precision, got %s", reverse.Precision)
-	}
-}
-
-func TestRoundTripCP(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/Fyodor Dostoyevsky/Crime and Punishment (103)/Crime and Punishment - Fyodor Dostoyevsky.epub"
-	c := NewCFIConverter(epubPath)
-
-	originalXP := "/body/DocFragment[6]/body/div/p[47]/text().2399"
-	contextText := "Raskolnikov was not used to crowds, and, as we said before, he avoided society of every sort, more especially of l"
-	forward, err := c.ConvertCREToStandard(originalXP, 0.0579, contextText)
-	if err != nil {
-		t.Fatalf("forward conversion error: %v", err)
-	}
-	if forward.EPUBCFI == "" {
-		t.Fatal("forward conversion produced empty epubcfi")
-	}
-	t.Logf("Forward: %s → %s", originalXP, forward.EPUBCFI)
-
-	reverse, err := c.ConvertStandardToCRE(forward.EPUBCFI, forward.Percentage, contextText)
-	if err != nil {
-		t.Fatalf("reverse conversion error: %v", err)
-	}
-	if reverse.XPointer == "" {
-		t.Fatal("reverse conversion produced empty XPointer")
-	}
-	t.Logf("Reverse: %s → %s", forward.EPUBCFI, reverse.XPointer)
-	t.Logf("Reverse precision: %s", reverse.Precision)
-
-	if reverse.Precision != "exact" {
-		t.Errorf("expected exact precision, got %s", reverse.Precision)
-	}
-}
-
-func TestReverseTextSearchFallback(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/Fyodor Dostoyevsky/Crime and Punishment (103)/Crime and Punishment - Fyodor Dostoyevsky.epub"
-	c := NewCFIConverter(epubPath)
-
-	contextText := "Raskolnikov was not used to crowds, and, as we said before, he avoided society of every sort, more especially of l"
-	reverse, err := c.ConvertStandardToCRE("epubcfi(/6/12!/4/99999/1:0)", 0.0579, contextText)
-	if err != nil {
-		t.Fatalf("reverse conversion error: %v", err)
-	}
-	t.Logf("Text search fallback XPointer: %s", reverse.XPointer)
-	t.Logf("Precision: %s", reverse.Precision)
-
-	if reverse.Precision != "exact" {
-		t.Errorf("expected exact precision from text search, got %s", reverse.Precision)
-	}
-	if reverse.XPointer == "" {
-		t.Error("expected non-empty XPointer from text search")
-	}
-}
-
-func TestReversePercentageFallback(t *testing.T) {
-	epubPath := "/home/nymusicman/Code/bookhoard/uploads/Ebooks/George Orwell/1984 (126)/1984 - George Orwell.epub"
-	c := NewCFIConverter(epubPath)
-
-	reverse, err := c.ConvertStandardToCRE("epubcfi(/6/12!/4/99999/1:0)", 0.5, "")
-	if err != nil {
-		t.Fatalf("reverse conversion error: %v", err)
-	}
-	t.Logf("Percentage fallback precision: %s", reverse.Precision)
-
-	if reverse.Precision != "percentage" {
-		t.Errorf("expected percentage precision, got %s with XPointer %s", reverse.Precision, reverse.XPointer)
-	}
-	if reverse.XPointer != "" {
-		t.Error("expected empty XPointer for percentage fallback")
-	}
-}
-
 func TestFindTextInNode_SingleTextNode(t *testing.T) {
 	doc := parseTestHTML(`<html><body><p>Hello world this is a test</p></body></html>`)
 	body := findBody(doc)

internal/sync/locators.go

@@ -1,6 +1,9 @@
 package sync
 
-import "log"
+import (
+	"log"
+	"sync"
+)
 
 type LocatorSource string
 
@@ -26,6 +29,35 @@ func isConvertible(formatGroup string) bool {
 	return formatGroup == string(FormatGroupReflowable)
 }
 
+// Converters parse and cache the whole EPUB (spine + content docs), so
+// creating one per annotation re-reads the book for every entry. A small
+// bounded cache lets one request — or several — share a single parse.
+// Servers are the right place for this work: clients stay thin.
+var (
+	converterMu    sync.Mutex
+	converterCache = map[string]*CFIConverter{}
+	converterOrder []string // insertion order for eviction
+)
+
+const maxCachedConverters = 8
+
+func cachedConverter(epubPath string) *CFIConverter {
+	converterMu.Lock()
+	defer converterMu.Unlock()
+	if c, ok := converterCache[epubPath]; ok {
+		return c
+	}
+	c := NewCFIConverter(epubPath)
+	converterCache[epubPath] = c
+	converterOrder = append(converterOrder, epubPath)
+	for len(converterOrder) > maxCachedConverters {
+		oldest := converterOrder[0]
+		converterOrder = converterOrder[1:]
+		delete(converterCache, oldest)
+	}
+	return c
+}
+
 func ConvertToCanonical(
 	source LocatorSource,
 	devicePos string,
@@ -48,7 +80,7 @@ func ConvertToCanonical(
 		if !IsCREXPointer(devicePos) {
 			return CanonicalLocator{CFI: devicePos, Precision: "already-standard", Percentage: percentage}
 		}
-		converter := NewCFIConverter(epubPath)
+		converter := cachedConverter(epubPath)
 		result, err := converter.ConvertCREToStandard(devicePos, percentage, contextText)
 		if err != nil || result == nil {
 			log.Printf("Bookhoard: locator CRE→CFI conversion failed: %v", err)
@@ -101,7 +133,7 @@ func ConvertFromCanonical(
 
 	switch source {
 	case LocatorSourceKOReader:
-		converter := NewCFIConverter(epubPath)
+		converter := cachedConverter(epubPath)
 		result, err := converter.ConvertStandardToCRE(canonicalCFI, percentage, contextText)
 		if err != nil || result == nil {
 			log.Printf("Bookhoard: locator CFI→CRE conversion failed: %v", err)

templates/book_detail.templ

@@ -425,7 +425,7 @@ templ BookDetail(user User, book handlers.MediaDetail, errorMessage string) {
 				}
 			</div>
 			@ProgressSyncModal(user, book)
-			@NotesHighlightsModal(book)
+			@NotesHighlightsModal(user, book)
 			@MetadataEditorModal(book)
 			@ErrorToast(errorMessage)
 		</body>

templates/book_detail_modals.templ

@@ -128,25 +128,106 @@ templ ProgressSyncModal(user User, book handlers.MediaDetail) {
 	</div>
 }
 
-templ NotesHighlightsModal(book handlers.MediaDetail) {
+templ NotesHighlightsModal(user User, book handlers.MediaDetail) {
 	<div
 		id="notes-modal"
-		class="hidden fixed inset-0 z-50 flex items-center justify-center p-4"
+		class="hidden fixed inset-0 z-50 flex items-center justify-center overflow-y-auto p-4"
 		style="background-color: var(--surface-overlay);"
 	>
 		<div
-			class="card w-full max-w-2xl p-8 text-center"
+			class="card w-full max-w-2xl my-8 flex flex-col max-h-[90vh]"
 			style="box-shadow: var(--shadow-pop);"
 		>
-			<span class="inline-grid place-items-center h-14 w-14 rounded-2xl mb-4" style="background-color: var(--accent-muted); color: var(--accent);">
-				@Icon("edit", "h-7 w-7")
-			</span>
-			<h2 class="text-2xl font-bold mb-2" style="color: var(--text-primary)">Notes & Highlights</h2>
-			<p class="mb-2" style="color: var(--text-secondary);">
-				This book has <strong>{ book.NotesCount }</strong> notes and <strong>{ book.HighlightsCount }</strong> highlights.
-			</p>
-			<p class="mb-6" style="color: var(--text-secondary);">Feature coming soon!</p>
-			<div>
+			<div class="flex justify-between items-center p-6 border-b flex-shrink-0" style="border-color: var(--border);">
+				<div class="flex items-center gap-3">
+					<span class="grid place-items-center h-10 w-10 rounded-xl shrink-0" style="background-color: var(--accent-muted); color: var(--accent);">
+						@Icon("edit", "h-5 w-5")
+					</span>
+					<div>
+						<h2 class="text-xl font-bold" style="color: var(--text-primary)">Notes &amp; Highlights</h2>
+						<p class="text-sm" style="color: var(--text-secondary);">{ book.Title }</p>
+					</div>
+				</div>
+				<button
+					@click="hideNotesModal()"
+					class="icon-btn"
+					aria-label="Close"
+				>
+					@Icon("close", "h-5 w-5")
+				</button>
+			</div>
+
+			<div class="p-6 overflow-y-auto flex-1 min-h-0">
+				<div class="flex items-center justify-center gap-6 mb-6">
+					<div class="text-center">
+						<div class="text-3xl font-bold" style="color: var(--accent);">{ book.HighlightsCount }</div>
+						<div class="text-xs uppercase tracking-wide" style="color: var(--text-secondary);">Highlights</div>
+					</div>
+					<div class="text-center">
+						<div class="text-3xl font-bold" style="color: var(--accent);">{ book.NotesCount }</div>
+						<div class="text-xs uppercase tracking-wide" style="color: var(--text-secondary);">Notes</div>
+					</div>
+					<div class="text-center">
+						<div class="text-3xl font-bold" style="color: var(--text-secondary);">{ len(book.DeletedAnnotations) }</div>
+						<div class="text-xs uppercase tracking-wide" style="color: var(--text-secondary);">Deleted</div>
+					</div>
+				</div>
+
+				if len(book.DeletedAnnotations) == 0 {
+					<div class="text-center py-6">
+						<p style="color: var(--text-secondary);">No deleted annotations. Highlights, notes, and bookmarks removed on the web or on a synced device appear here for recovery.</p>
+					</div>
+				} else {
+					<div class="flex items-center gap-2 mb-3">
+						<h3 class="text-sm font-semibold uppercase tracking-wide" style="color: var(--text-secondary);">Recently deleted</h3>
+						<span class="badge" style="background-color: var(--accent-muted); color: var(--accent);">{ len(book.DeletedAnnotations) }</span>
+					</div>
+					<p class="text-xs mb-4" style="color: var(--text-secondary);">
+						Deleted entries are kept for the sync retention window before being removed automatically. Restore returns them to every synced device; Delete permanently removes them immediately.
+					</p>
+					<div class="space-y-3">
+						for _, ann := range book.DeletedAnnotations {
+							<div class="card p-4" data-deleted-annotation={ ann.ID }>
+								<div class="flex justify-between items-start gap-3 mb-2">
+									<div class="flex items-center gap-2">
+										<span class="badge" style="background-color: var(--accent-muted); color: var(--accent);">{ ann.AnnotationType }</span>
+										<span class="text-xs" style="color: var(--text-secondary);">
+											{ FormatInTimezone(ann.DeletedAt, user.Timezone) }
+										</span>
+									</div>
+									<div class="flex items-center gap-2 shrink-0">
+										<button
+											@click={"restoreDeletedAnnotation('" + ann.AnnotationType + "', '" + ann.ID + "')"}
+											class="btn btn-secondary text-xs px-3 py-1.5"
+										>
+											@Icon("refresh", "h-3.5 w-3.5")
+											Restore
+										</button>
+										<button
+											@click={"purgeDeletedAnnotation('" + ann.AnnotationType + "', '" + ann.ID + "')"}
+											class="btn btn-ghost text-xs px-3 py-1.5"
+											style="color: var(--status-error);"
+										>
+											@Icon("close", "h-3.5 w-3.5")
+											Delete permanently
+										</button>
+									</div>
+								</div>
+								if ann.DisplayText != "" {
+									<p class="text-sm line-clamp-3" style="color: var(--text-primary);">{ ann.DisplayText }</p>
+								} else {
+									<p class="text-sm italic" style="color: var(--text-secondary);">(no text)</p>
+								}
+								if ann.SecondaryText != "" {
+									<p class="text-xs mt-1 line-clamp-2" style="color: var(--text-secondary);">{ ann.SecondaryText }</p>
+								}
+							</div>
+						}
+					</div>
+				}
+			</div>
+
+			<div class="flex justify-end p-6 border-t flex-shrink-0" style="border-color: var(--border);">
 				<button
 					@click="hideNotesModal()"
 					class="btn btn-primary"

templates/book_detail_templ.go

@@ -1336,7 +1336,7 @@ func BookDetail(user User, book handlers.MediaDetail, errorMessage string) templ
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = NotesHighlightsModal(book).Render(ctx, templ_7745c5c3_Buffer)
+		templ_7745c5c3_Err = NotesHighlightsModal(user, book).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}

web/src/book-detail.ts

@@ -116,6 +116,8 @@ interface MetadataEditorState {
   clearRating(): Promise<void>;
   toggleRead(read: boolean): Promise<void>;
   resolveConflict(conflictId: string, winner: string): Promise<void>;
+  restoreDeletedAnnotation(annotationType: string, annotationId: string): Promise<void>;
+  purgeDeletedAnnotation(annotationType: string, annotationId: string): Promise<void>;
 }
 
 Alpine.data("bookDetail", () => {
@@ -194,6 +196,65 @@ Alpine.data("bookDetail", () => {
       }
     },
 
+    async restoreDeletedAnnotation(annotationType: string, annotationId: string) {
+      const mediaId = getMediaId();
+      try {
+        const resp = await fetch(
+          `/api/media-items/${mediaId}/annotations/${annotationId}/restore`,
+          {
+            method: "POST",
+            headers: {
+              Authorization: getAuthHeader(),
+              "Content-Type": "application/json",
+            },
+            body: JSON.stringify({ annotation_type: annotationType }),
+          },
+        );
+        if (!resp.ok) {
+          const err = await resp.json().catch(() => ({}));
+          throw new Error(err.error || "Failed to restore annotation");
+        }
+        showToast("Annotation restored", "success");
+        setTimeout(() => window.location.reload(), 500);
+      } catch (e) {
+        showToast(
+          e instanceof Error ? e.message : "Failed to restore annotation",
+          "error",
+        );
+      }
+    },
+
+    async purgeDeletedAnnotation(annotationType: string, annotationId: string) {
+      if (
+        !confirm(
+          "Permanently delete this annotation? This cannot be undone and it will not reappear on any device.",
+        )
+      ) {
+        return;
+      }
+      const mediaId = getMediaId();
+      try {
+        const resp = await fetch(
+          `/api/media-items/${mediaId}/annotations/${annotationId}?annotation_type=${encodeURIComponent(annotationType)}`,
+          {
+            method: "DELETE",
+            headers: { Authorization: getAuthHeader() },
+          },
+        );
+        if (!resp.ok) {
+          const err = await resp.json().catch(() => ({}));
+          throw new Error(err.error || "Failed to delete annotation");
+        }
+        showToast("Annotation permanently deleted", "success");
+        setTimeout(() => window.location.reload(), 500);
+      } catch (e) {
+        showToast(
+          e instanceof Error ? e.message : "Failed to delete annotation",
+          "error",
+        );
+      }
+    },
+
     init() {
       const ratingAttr = document.body.getAttribute("data-rating");
       this.userRating = ratingAttr ? parseInt(ratingAttr, 10) || 0 : 0;

web/src/reader/reader.ts

@@ -412,6 +412,8 @@ document.addEventListener("alpine:init", () => {
       note: string;
       color: string;
       cfi: string;
+      cfiEnd: string;
+      renderCfi: string;
       percentage: number;
       pdfPage: number;
       pdfRects: number[][];
@@ -443,6 +445,7 @@ document.addEventListener("alpine:init", () => {
       y: 0,
       text: "",
       cfi: "",
+      cfiEnd: "",
       id: "",
       color: "#ffd54f",
       note: "",
@@ -701,8 +704,15 @@ document.addEventListener("alpine:init", () => {
             const text = sel.toString().replace(/\s+/g, " ").trim();
             if (!text) return;
             let cfi: string;
+            let cfiEnd: string;
             try {
               cfi = this.view.getCFI(index, range);
+              // Collapse to the end point for a distinct end anchor —
+              // KOReader sync renders the highlight box from pos0/pos1, and
+              // pos1 == pos0 would be a degenerate (zero-length) range.
+              const endRange = range.cloneRange();
+              endRange.collapse(false);
+              cfiEnd = this.view.getCFI(index, endRange);
             } catch {
               return;
             }
@@ -715,6 +725,7 @@ document.addEventListener("alpine:init", () => {
               y: (iframeRect?.top ?? 0) + rect.top,
               text,
               cfi,
+              cfiEnd,
             });
           };
           doc.addEventListener(
@@ -827,6 +838,7 @@ document.addEventListener("alpine:init", () => {
           y: (iframeRect?.top ?? 0) + rect.top,
           text: h.text,
           cfi: h.cfi,
+          cfiEnd: h.cfiEnd,
           id: h.id,
           color: h.color,
           note: h.note,
@@ -1070,6 +1082,7 @@ document.addEventListener("alpine:init", () => {
       y: number;
       text: string;
       cfi: string;
+      cfiEnd?: string;
       id?: string;
       color?: string;
       note?: string;
@@ -1080,6 +1093,7 @@ document.addEventListener("alpine:init", () => {
       p.mode = opts.mode;
       p.text = opts.text;
       p.cfi = opts.cfi;
+      p.cfiEnd = opts.cfiEnd ?? "";
       p.id = opts.id ?? "";
       p.color = opts.color || "#ffd54f";
       p.note = opts.note ?? "";
@@ -1109,7 +1123,7 @@ document.addEventListener("alpine:init", () => {
         } else {
           this.view
             ?.addAnnotation({
-              value: hl.cfi,
+              value: hl.renderCfi || hl.cfi,
               color: hl.color,
               note: hl.note,
               id: hl.id,
@@ -1141,17 +1155,68 @@ document.addEventListener("alpine:init", () => {
           /* not ours; leave as-is */
         }
       }
+      const cfiEnd = r.epubcfi_end ?? "";
       return {
         id: r.id,
         text: r.selection_text ?? "",
         note: r.note_text ?? "",
         color: r.color ?? "#ffff00",
         cfi,
+        cfiEnd,
+        // Rendering/navigating anchor: device-synced highlights store
+        // POINT CFIs (epubcfi(/6/N!/4/2[id]/8/1:1)), which resolve to a
+        // collapsed range and paint nothing. Foliate's overlayer needs a
+        // RANGE CFI — same shape getCFI() produces natively
+        // (epubcfi(/6/N!/4/2[id],/8/1:1,/8/1:67)) — synthesized here from
+        // the stored start and end points when both share a base path.
+        renderCfi: this.toRangeCfi(cfi, cfiEnd, r.selection_text ?? ""),
         percentage: r.percentage_start ?? 0,
         pdfPage,
         pdfRects,
       };
     },
+    // Build a foliate-renderable RANGE CFI from stored (possibly point)
+    // CFIs. Repairs two stale shapes using the selection text: a missing
+    // end (old web highlights), and a degenerate end — the device-push
+    // converter used to fall back to a document-start CFI when the end
+    // xpointer didn't resolve exactly. In both cases the end is derived
+    // from the start offset advanced by the text's UTF-16 length (EPUB
+    // CFI offsets are UTF-16 code units); multi-node selections just fail
+    // resolution harmlessly and fall back to the point CFI.
+    toRangeCfi(start: string, end: string, text: string): string {
+      if (!start) return end || start;
+      if (start.includes(",")) return start; // already a range CFI
+      const re =
+        /^(epubcfi\(\/\d+\/\d+!\/\d+\/\d+(?:\[[^\]]*\])?)(\/(?:[^:)]+)?(?::(\d+))?)\)$/;
+      const ms = re.exec(start);
+      if (!ms) return start;
+      const base = ms[1];
+      const startLocal = ms[2];
+      const startOff = ms[3] ? parseInt(ms[3], 10) : -1;
+      const utf16len = [...(text ?? "")].reduce(
+        (n, c) => n + (c.codePointAt(0)! > 0xffff ? 2 : 1),
+        0,
+      );
+      let endLocal = "";
+      if (end && !end.includes(",")) {
+        const me = re.exec(end);
+        if (me && me[1] === base) {
+          const endOff = me[3] ? parseInt(me[3], 10) : -1;
+          // Degenerate: end resolves to the document start (the old
+          // converter fallback) or sits before the start offset.
+          const degenerate =
+            endOff === 0 ||
+            (startOff >= 0 && endOff >= 0 && endOff < startOff);
+          if (!degenerate) endLocal = me[2];
+        }
+      }
+      if (!endLocal) {
+        if (startOff < 0 || utf16len <= 0) return start; // point CFI
+        const cut = startLocal.lastIndexOf(":");
+        endLocal = `${startLocal.slice(0, cut)}:${startOff + utf16len}`;
+      }
+      return `${base},${startLocal},${endLocal})`;
+    },
     async refreshAnnotations() {
       const token = getToken();
       if (!token || !this.mediaItemId) return;
@@ -1205,6 +1270,7 @@ document.addEventListener("alpine:init", () => {
               start_position: "",
               end_position: "",
               epubcfi_start: p.pdfPage >= 0 ? pdfAnchor : p.cfi,
+              epubcfi_end: p.pdfPage >= 0 ? pdfAnchor : p.cfiEnd,
               color,
               note_text: "",
               percentage_start: this.lastRelocateDetail?.fraction ?? 0,
@@ -1230,7 +1296,10 @@ document.addEventListener("alpine:init", () => {
           }
         } else {
           this.view?.addAnnotation({
-            value: p.cfi,
+            value:
+              p.pdfPage >= 0
+                ? ""
+                : this.toRangeCfi(p.cfi, p.cfiEnd, p.text) || p.cfi,
             color,
             note: "",
             id: row.id,
@@ -1263,6 +1332,7 @@ document.addEventListener("alpine:init", () => {
               start_position: "",
               end_position: "",
               epubcfi_start: anchor,
+              epubcfi_end: p.pdfPage >= 0 ? anchor : p.cfiEnd,
               color: p.color,
               note_text: p.note,
             }),
@@ -1282,7 +1352,7 @@ document.addEventListener("alpine:init", () => {
           });
         } else {
           this.view?.addAnnotation({
-            value: p.cfi,
+            value: this.toRangeCfi(p.cfi, p.cfiEnd, p.text) || p.cfi,
             color: p.color,
             note: p.note,
             id: p.id,
@@ -1324,6 +1394,7 @@ document.addEventListener("alpine:init", () => {
     },
     goToHighlight(hl: {
       cfi: string;
+      renderCfi: string;
       pdfPage: number;
     }) {
       if (hl.pdfPage >= 0) {
@@ -1331,9 +1402,11 @@ document.addEventListener("alpine:init", () => {
         this.pushBackStack();
         this.view?.goTo?.(hl.pdfPage);
         this.closeDrawers();
-      } else if (hl.cfi) {
+      } else if (hl.renderCfi || hl.cfi) {
         this.pushBackStack();
-        this.view?.showAnnotation({ value: hl.cfi })?.catch?.(() => {});
+        this.view
+          ?.showAnnotation({ value: hl.renderCfi || hl.cfi })
+          ?.catch?.(() => {});
         this.closeDrawers();
       }
     },