bookhoard/docs/contract_pins.md

Wire-contract pins (hardening batches)

These are the response SHAPES (JSON key sets, not values) frozen by the TestContractPin_* suite in cmd/server/tests/contract_pins_test.go (batch H0). The plan they serve is ~/.opencode/plan/hardening-canonical-types.md.

Rules

1. Frozen: no existing response key may be RENAMED or REMOVED on any endpoint below (JSON or KOReader/Kobo adapters). Requests are frozen too — no parsing changes.
2. Additive keys are allowed and expected — but a batch must widen the allowed slice in the test AND record the addition in the changelog below, in the same commit.
3. KOReader / Kobo / progress surfaces are the hard freeze: the KOReader plugin is an external client whose handlers keep response shapes byte-identical (only their internals may route through shared funnels).
4. A behavior fix that would require narrowing or REMOVING a pinned key needs the user's explicit sign-off before the pin is touched — a pin freezing buggy behavior is a known-bugs ledger, not a license.

Pinned surfaces

Test	Surface	Shape
ProgressWeb	GET /api/media-items/:id/progress (percentage-only write)	flat map: id, media_item_id, user_id, current_page, total_pages, last_read_at, percentage, character_offset, epubcfi, chapter, chapter_progress, format_group, total_characters, chapter_count, last_sync_device, last_sync_source, last_sync_timestamp
	… conditional bolt-ons	context_text (when stored valid); css_selector, anchor_href, char_offset, rewritten epubcfi (when the anchor verify path fires)
	PUT /api/media-items/:id/progress response	database.ReadingProgress JSON (25 keys incl. audio_offset_seconds, viewport/zoom/scroll/panel/reading_mode)
	GET with no rows	exactly {current_page, total_pages}
KOReaderProgressPush	POST /api/sync/koreader/progress (immediate, 202)	sync_status, books_synced, book_results[]?{sha256, book_uuid, synced}, conflicts[]?{book_uuid, conflict_type, device_progress, server_progress, resolution}, timestamp, device_updated
KOReaderProgressPull	GET /api/sync/koreader/metadata/:uuid	uuid, sha256?, title, authors, progress{percentage + optional character/epubcfi/koreader_xpointer/chapter/chapter_progress/page/total_pages}, annotations{highlights?, notes?, bookmarks?, deleted_highlights?, deleted_bookmarks?}, last_sync
KOReaderLibrary	GET /api/sync/koreader/library	library_sync[]{uuid, sha256?, title, author, content_type, percent_read, pages_remaining?, bookmark_count, last_modified}, total_books, last_sync
KOReaderBookmarksPush	POST /api/sync/koreader/bookmarks	sync_status, bookmarks_synced, notes_synced, highlights_synced, total_synced, timestamp
KoboInitialization	GET /api/sync/kobo/:token/v1/initialization	library_sync[]{ContentId, ContentType, Title, Author, PercentRead, PagesRemaining?, BookmarkCount, LastModified, EntitlementId, Revision, MimeType, FileSize, Categories?, BookhoardUUID?}, total_books, last_sync
KoboMarkupSync	POST /api/sync/kobo/:token/markup	Status, MarkupsSynced, BookmarksSynced, DeletedAnnotations?
KoboSyncFromServer	POST /api/sync/kobo/:token/sync-from-server	BooksSynced, BookmarksSent, HighlightsSent
CollectionsJSON	GET /api/collections/:id (all 4 branches)	envelope id, user_id, name, description, color, icon, auto_assign_rules, view_settings, books[], book_count, is_smart, created_at; books = BookInfo
	POST /api/collections/preview	bare {items: BookInfo[]}
SeriesJSON	GET /api/series/books?name=&library_id=	{name, library_id, books: BookInfo[], total}
SearchJSON	GET /api/media-items/search?q=&library_id=	top-level array of SearchMediaItemsUnifiedRow (47 keys)
DashboardSections	GET /api/dashboard/sections	{sections[]: {id, collection_id, is_system, title, description, icon, items: BookInfo[], view_all_url, priority}}
MediaListBothBranches	GET /api/media-items (unscoped)	{data: [38-key resolved map]} (intentionally divergent from the scoped branch until the row-shape collapse batch)
	GET /api/media-items?library_id=&sort=	{data: [raw ListMediaItemsSortedRow, 70 sqlc keys]}
SSRPages	/bookshelf, /collections, /collections/:id, /series, /series/detail, /tags/detail	200 + stable title/substring markers

BookInfo (every card surface): media_item_id, title, author, cover_image_path, has_conflict, format_group, badge.

Changelog (additive keys per batch)

• H0 (initial pin) — the shapes above, captured on the unmodified tree at commit b4ae423.
• H1 (progress canonicalization) — GET /api/media-items/:id/progress Whitelisted ADDITIVE keys (fields the GetUniversalProgressRow already carries, now surfaced by the shared row serializer): audio_offset_seconds, reading_mode, viewport_x, viewport_y, zoom_level, scroll_position_x, scroll_position_y, panel_number. No key removed or renamed; the no-rows and PUT-response shapes are untouched. The web PUT binds SaveProgressRequest directly — its parse set for existing clients is IDENTICAL to the old DTO (verified against web/src reader.ts:3113-3143 and audio.ts:518-520); keys the web never sent (viewport_x/y, panel_number) merely become honor-able. All other pins unchanged.
• H3-prep (web annotation CRUD freeze) — NEW pinned surfaces, captured pre-refactor per the pin-first doctrine: POST/PUT/DELETE /api/media-items/:id/{notes,highlights,bookmarks} — create 201 / update 200 / delete 204, response bodies are the full sqlc row models (MediaNotes 19 keys, MediaBookmarks 20 keys, MediaHighlights 27 keys — listed in contract_pins_test.go). No keys removed; nothing was pinned here before. Capturing these immediately caught a LIVE server bug: applyNoteLWW omitted UserID from its UpdateMediaNoteForSync params, so every dedup-hit note re-save (same content+position ⇒ same key) returned 500 ("update note: no rows in result set") — the LWW update could never land. Fixed in the same commit (server-side fix, freely allowed); the pins are its regression net.
• H3 (PUT fixes routed through the sync service) — PUT /api/media-items/:id/bookmarks/:bookmarkId now parses ADDITIONAL optional request keys mirroring its create sibling: cfi_position, page_number, chapter_number, percentage, chapter_reference (all zero-value-preserving: omitted keys coalesce with the stored row inside the service, so legacy clients that send only title/notes/position keep every stored locator — verified by TestH3_BookmarkPUTPreservesLocators). The PUT lands as an id-targeted LWW edit under the row's stored dedup key (BookmarkID/NoteID mirror SaveHighlightRequest.HighlightID), so last_modified_source / last_modified_at are now maintained. Note PUT unchanged on the wire (content+position) but routed through the service the same way. Response shapes unchanged (same row models — pins green).
• H4 (unified row completion) — /api/media-items/search rows[] whitelisted ADDITIVE keys abridged, audio_metadata: the unified search row gained the two columns it lagged (EXPLAIN plan-identical — both ride the already-scanned media_items side), and the endpoint serializes the row directly, so they emit. No key removed or renamed.
• Origin writer attribution (post-hardening parity) — every web-API write endpoint now parses an ADDITIVE optional request key origin ("android" | "ios"; anything else stays "web") and records it as the writer: progress PUT → last_sync_source, bookmark/note/highlight create+PUT → last_modified_source (and origin_source on bookmark creates, now normalized through the same gate). Precedence on progress: a paired X-Device-Token still outranks origin. The web SPA sends no origin — its rows are unchanged. Request-parse widening documented per rule 2; response shapes untouched; locked by TestOriginWriterAttribution.

Changelog entry — multi-file audiobooks (2026-10-18)

• GET /api/media-items/:id/chapters gained ADDITIVE response keys layout ("" for single-file books, "folder" or "zip" for multi-file books) and tracks[] (index, url, title, path, start, end, duration_seconds, size_bytes; empty for single-file books). Existing keys (media_item_id, chapters, duration_seconds, codec_profile) unchanged — no pin existed on this endpoint, so no pin widened; recorded here per rule 2's spirit.
• New sibling endpoint GET /api/media-items/:id/audio/:trackIndex streams one track of a multi-file book (Range-capable). New surface, not a modification; gated by library visibility like ServeFile (403 on hidden libraries).
• media_items.audio_metadata payload gained additive JSON keys layout and tracks (see schema.sql comment). Consumers parse additively; stored single-file payloads are unchanged.