feat(data): duplicate-content queries — archive filters, cross-library moves, archived-twin matching

Three related query groups in queries.sql (sqlc regenerated; no generated
signatures changed, so no caller edits were needed):

1. Dashboard/collection archive filters. The smart-section and collection
   queries returned archived and missing items (visible only as broken
   covers once their files vanished). Added the codebase-standard
   "AND archived_at IS NULL AND missing_scan_count = 0" predicate to:
   GetContinueReadingItems, GetRecentlyAddedItems, GetRecentlyReadItems,
   GetNotStartedItems, GetCollectionItemsForDashboard, GetLibraryItems.
   Matches the existing convention in ListMediaItems, SearchMediaItems,
   the library counts, and GetContinueSeriesItems.

2. Cross-library SHA move detection support.
   - GetMediaItemsBySHA256AndSameLibraryType: finds identical content
     (same file_sha256) registered in a DIFFERENT library of the SAME
     library type, ordered archived-first, most-missing, oldest. Type
     scoping keeps ebooks from merging into manga/comics libraries.
   - MoveMediaItemToLibrary: repoints an existing row to the new library
     (library_id + recomputed file_path + file_size) and clears
     archive/missing state. The row keeps its ID, so reading progress,
     annotations, collections, and kobo shelves follow the book
     automatically; the new set_library_type_name_on_library_change
     trigger refreshes the denormalized type column.

3. Archived-twin matching. ListHiddenMediaItems (admin archived-items
   page) now LEFT JOIN LATERALs the best active same-SHA twin per hidden
   row — preferring same library type, then same library, then most
   reading progress, then oldest — exposing match_id / match_title /
   match_library_name so the UI can offer merging the archived row's
   reading data into its active duplicate. COALESCE on match_title keeps
   the no-match case NULL-safe.

internal/database/querier.go

@@ -259,6 +259,12 @@ type Querier interface {
 	GetMediaItemFormats(ctx context.Context, mediaItemID pgtype.UUID) ([]MediaItemFormats, error)
 	// Per-item user-data counts, used when choosing which duplicate copy to keep
 	GetMediaItemUsageCounts(ctx context.Context, mediaItemID pgtype.UUID) (GetMediaItemUsageCountsRow, error)
+	// Cross-library move detection: identical content registered in a different
+	// library of the same type (ebooks stay with ebooks, comics with comics).
+	// Candidates may be active copies (deliberate duplicates - leave alone) or
+	// hidden/archived rows whose file vanished (move candidates - the scanner
+	// verifies disk state before repointing).
+	GetMediaItemsBySHA256AndSameLibraryType(ctx context.Context, arg GetMediaItemsBySHA256AndSameLibraryTypeParams) ([]GetMediaItemsBySHA256AndSameLibraryTypeRow, error)
 	GetMediaNote(ctx context.Context, id pgtype.UUID) (MediaNotes, error)
 	// ============================================
 	// ANNOTATION SYNC QUERIES (notes)
@@ -349,7 +355,10 @@ type Querier interface {
 	ListDevicesByUser(ctx context.Context, userID pgtype.UUID) ([]Devices, error)
 	// Items hidden from libraries: either missing from disk (waiting on the
 	// second scan that archives them) or already archived and pending purge.
-	// Feeds the admin archived-items page.
+	// Feeds the admin archived-items page. match_* columns identify an active
+	// item with identical content (same SHA-256) so the UI can offer merging the
+	// archived row's reading data into its active twin instead of waiting for a
+	// file that will never return.
 	ListHiddenMediaItems(ctx context.Context) ([]ListHiddenMediaItemsRow, error)
 	ListLibraries(ctx context.Context) ([]ListLibrariesRow, error)
 	ListMediaItems(ctx context.Context, arg ListMediaItemsParams) ([]ListMediaItemsRow, error)
@@ -374,6 +383,11 @@ type Querier interface {
 	// a move. Repoints the row (and refreshes file-level fields) so reading
 	// history follows the book; archive/missing state is cleared separately.
 	MoveMediaItemFilePath(ctx context.Context, arg MoveMediaItemFilePathParams) error
+	// Cross-library move: identical content reappeared in a different library of
+	// the same type while the old file vanished. Repoints the row so reading
+	// history, annotations and collections follow the book; archive/missing
+	// state is cleared. library_type_name is refreshed by trigger.
+	MoveMediaItemToLibrary(ctx context.Context, arg MoveMediaItemToLibraryParams) error
 	// Manual bulk purge from the library admin page.
 	PurgeAllArchivedMediaItems(ctx context.Context) ([]PurgeAllArchivedMediaItemsRow, error)
 	// Retention sweep at library-scan time: hard-delete archived items older

internal/database/queries.sql.go

@@ -2623,6 +2623,8 @@ SELECT ci.id, ci.collection_id, ci.media_item_id, ci.added_at, ci.added_by_user_
 FROM collection_items ci
 JOIN media_items mi ON ci.media_item_id = mi.id
 WHERE ci.collection_id = $1
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY ci.added_at DESC
 `
 
@@ -2676,6 +2678,8 @@ SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.fi
 INNER JOIN collection_items ci ON ci.media_item_id = mi.id
 WHERE ci.collection_id = $1
   AND ($2::uuid IS NULL OR mi.library_id = $2::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY ci.added_at DESC
 LIMIT $3
 `
@@ -2982,6 +2986,8 @@ INNER JOIN (
     ORDER BY media_item_id, last_read_at DESC
 ) rp ON rp.media_item_id = mi.id
 WHERE ($2::uuid IS NULL OR mi.library_id = $2::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY rp.last_read_at DESC
 LIMIT $3
 `
@@ -4378,6 +4384,8 @@ func (q *Queries) GetLibraryFolders(ctx context.Context, libraryID pgtype.UUID)
 const GetLibraryItems = `-- name: GetLibraryItems :many
 SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence FROM media_items mi
 WHERE ($1::uuid IS NULL OR mi.library_id = $1::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY mi.created_at DESC
 `
 
@@ -5694,6 +5702,184 @@ func (q *Queries) GetMediaItemUsageCounts(ctx context.Context, mediaItemID pgtyp
 	return i, err
 }
 
+const GetMediaItemsBySHA256AndSameLibraryType = `-- name: GetMediaItemsBySHA256AndSameLibraryType :many
+SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence, lt.name AS library_type_name
+FROM media_items mi
+JOIN libraries l ON mi.library_id = l.id
+JOIN library_types lt ON l.library_type_id = lt.id
+JOIN libraries target_lib ON target_lib.id = $1
+WHERE mi.file_sha256 = $2
+  AND mi.library_id <> $1
+  AND lt.id = target_lib.library_type_id
+ORDER BY (mi.archived_at IS NOT NULL) DESC,
+         mi.missing_scan_count DESC,
+         mi.created_at ASC
+`
+
+type GetMediaItemsBySHA256AndSameLibraryTypeParams struct {
+	LibraryID  pgtype.UUID `db:"library_id" json:"library_id"`
+	FileSha256 pgtype.Text `db:"file_sha256" json:"file_sha256"`
+}
+
+type GetMediaItemsBySHA256AndSameLibraryTypeRow struct {
+	ID                 pgtype.UUID        `db:"id" json:"id"`
+	LibraryID          pgtype.UUID        `db:"library_id" json:"library_id"`
+	Title              string             `db:"title" json:"title"`
+	Author             pgtype.Text        `db:"author" json:"author"`
+	Isbn               pgtype.Text        `db:"isbn" json:"isbn"`
+	Description        pgtype.Text        `db:"description" json:"description"`
+	FilePath           string             `db:"file_path" json:"file_path"`
+	FileSize           pgtype.Int8        `db:"file_size" json:"file_size"`
+	MimeType           pgtype.Text        `db:"mime_type" json:"mime_type"`
+	CoverImagePath     pgtype.Text        `db:"cover_image_path" json:"cover_image_path"`
+	Series             pgtype.Text        `db:"series" json:"series"`
+	SeriesNumber       pgtype.Int4        `db:"series_number" json:"series_number"`
+	Tags               []string           `db:"tags" json:"tags"`
+	Asin               pgtype.Text        `db:"asin" json:"asin"`
+	DatePublished      pgtype.Date        `db:"date_published" json:"date_published"`
+	Publisher          pgtype.Text        `db:"publisher" json:"publisher"`
+	Contributors       []string           `db:"contributors" json:"contributors"`
+	Language           pgtype.Text        `db:"language" json:"language"`
+	Edition            pgtype.Text        `db:"edition" json:"edition"`
+	PageCount          pgtype.Int4        `db:"page_count" json:"page_count"`
+	Genre              pgtype.Text        `db:"genre" json:"genre"`
+	CopyrightYear      pgtype.Int4        `db:"copyright_year" json:"copyright_year"`
+	GoodreadsID        pgtype.Text        `db:"goodreads_id" json:"goodreads_id"`
+	OpenlibraryID      pgtype.Text        `db:"openlibrary_id" json:"openlibrary_id"`
+	GoogleBooksID      pgtype.Text        `db:"google_books_id" json:"google_books_id"`
+	AddedByAdminID     pgtype.UUID        `db:"added_by_admin_id" json:"added_by_admin_id"`
+	CreatedAt          pgtype.Timestamptz `db:"created_at" json:"created_at"`
+	ImportedAt         pgtype.Timestamptz `db:"imported_at" json:"imported_at"`
+	UpdatedAt          pgtype.Timestamptz `db:"updated_at" json:"updated_at"`
+	FormatGroup        string             `db:"format_group" json:"format_group"`
+	FormatMimetype     pgtype.Text        `db:"format_mimetype" json:"format_mimetype"`
+	IsReflowable       pgtype.Bool        `db:"is_reflowable" json:"is_reflowable"`
+	HasFixedLayout     pgtype.Bool        `db:"has_fixed_layout" json:"has_fixed_layout"`
+	TotalCharacters    pgtype.Int8        `db:"total_characters" json:"total_characters"`
+	ChapterCount       pgtype.Int4        `db:"chapter_count" json:"chapter_count"`
+	EntitlementID      pgtype.Text        `db:"entitlement_id" json:"entitlement_id"`
+	RevisionNumber     pgtype.Int4        `db:"revision_number" json:"revision_number"`
+	KoboContentID      pgtype.Text        `db:"kobo_content_id" json:"kobo_content_id"`
+	KoboMetadata       []byte             `db:"kobo_metadata" json:"kobo_metadata"`
+	MangaType          pgtype.Text        `db:"manga_type" json:"manga_type"`
+	ReadingDirection   pgtype.Text        `db:"reading_direction" json:"reading_direction"`
+	SeriesCount        pgtype.Int4        `db:"series_count" json:"series_count"`
+	Volume             pgtype.Int4        `db:"volume" json:"volume"`
+	Imprint            pgtype.Text        `db:"imprint" json:"imprint"`
+	AgeRating          pgtype.Text        `db:"age_rating" json:"age_rating"`
+	WebUrl             pgtype.Text        `db:"web_url" json:"web_url"`
+	StoryArc           pgtype.Text        `db:"story_arc" json:"story_arc"`
+	IsBlackAndWhite    pgtype.Bool        `db:"is_black_and_white" json:"is_black_and_white"`
+	MetadataNotes      pgtype.Text        `db:"metadata_notes" json:"metadata_notes"`
+	CommunityRating    pgtype.Float8      `db:"community_rating" json:"community_rating"`
+	AlternateInfo      []byte             `db:"alternate_info" json:"alternate_info"`
+	ScanInformation    pgtype.Text        `db:"scan_information" json:"scan_information"`
+	Summary            pgtype.Text        `db:"summary" json:"summary"`
+	MetadataOverrides  []string           `db:"metadata_overrides" json:"metadata_overrides"`
+	MissingScanCount   int32              `db:"missing_scan_count" json:"missing_scan_count"`
+	ArchivedAt         pgtype.Timestamptz `db:"archived_at" json:"archived_at"`
+	ChapterMetadata    []byte             `db:"chapter_metadata" json:"chapter_metadata"`
+	LibraryTypeName    pgtype.Text        `db:"library_type_name" json:"library_type_name"`
+	TagsSearch         []string           `db:"tags_search" json:"tags_search"`
+	ContributorsSearch []string           `db:"contributors_search" json:"contributors_search"`
+	FileSha256         pgtype.Text        `db:"file_sha256" json:"file_sha256"`
+	OpfIdentifier      pgtype.Text        `db:"opf_identifier" json:"opf_identifier"`
+	OpfUuid            pgtype.Text        `db:"opf_uuid" json:"opf_uuid"`
+	HashConfidence     pgtype.Text        `db:"hash_confidence" json:"hash_confidence"`
+	LibraryTypeName_2  string             `db:"library_type_name_2" json:"library_type_name_2"`
+}
+
+// Cross-library move detection: identical content registered in a different
+// library of the same type (ebooks stay with ebooks, comics with comics).
+// Candidates may be active copies (deliberate duplicates - leave alone) or
+// hidden/archived rows whose file vanished (move candidates - the scanner
+// verifies disk state before repointing).
+func (q *Queries) GetMediaItemsBySHA256AndSameLibraryType(ctx context.Context, arg GetMediaItemsBySHA256AndSameLibraryTypeParams) ([]GetMediaItemsBySHA256AndSameLibraryTypeRow, error) {
+	rows, err := q.db.Query(ctx, GetMediaItemsBySHA256AndSameLibraryType, arg.LibraryID, arg.FileSha256)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	items := []GetMediaItemsBySHA256AndSameLibraryTypeRow{}
+	for rows.Next() {
+		var i GetMediaItemsBySHA256AndSameLibraryTypeRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.LibraryID,
+			&i.Title,
+			&i.Author,
+			&i.Isbn,
+			&i.Description,
+			&i.FilePath,
+			&i.FileSize,
+			&i.MimeType,
+			&i.CoverImagePath,
+			&i.Series,
+			&i.SeriesNumber,
+			&i.Tags,
+			&i.Asin,
+			&i.DatePublished,
+			&i.Publisher,
+			&i.Contributors,
+			&i.Language,
+			&i.Edition,
+			&i.PageCount,
+			&i.Genre,
+			&i.CopyrightYear,
+			&i.GoodreadsID,
+			&i.OpenlibraryID,
+			&i.GoogleBooksID,
+			&i.AddedByAdminID,
+			&i.CreatedAt,
+			&i.ImportedAt,
+			&i.UpdatedAt,
+			&i.FormatGroup,
+			&i.FormatMimetype,
+			&i.IsReflowable,
+			&i.HasFixedLayout,
+			&i.TotalCharacters,
+			&i.ChapterCount,
+			&i.EntitlementID,
+			&i.RevisionNumber,
+			&i.KoboContentID,
+			&i.KoboMetadata,
+			&i.MangaType,
+			&i.ReadingDirection,
+			&i.SeriesCount,
+			&i.Volume,
+			&i.Imprint,
+			&i.AgeRating,
+			&i.WebUrl,
+			&i.StoryArc,
+			&i.IsBlackAndWhite,
+			&i.MetadataNotes,
+			&i.CommunityRating,
+			&i.AlternateInfo,
+			&i.ScanInformation,
+			&i.Summary,
+			&i.MetadataOverrides,
+			&i.MissingScanCount,
+			&i.ArchivedAt,
+			&i.ChapterMetadata,
+			&i.LibraryTypeName,
+			&i.TagsSearch,
+			&i.ContributorsSearch,
+			&i.FileSha256,
+			&i.OpfIdentifier,
+			&i.OpfUuid,
+			&i.HashConfidence,
+			&i.LibraryTypeName_2,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
+
 const GetMediaNote = `-- name: GetMediaNote :one
 SELECT id, media_item_id, user_id, content, position, created_at, updated_at, percentage_location, character_start, character_end, epubcfi_location, chapter_reference, paragraph_reference, device_sync_data, dedup_key, last_modified_at, last_modified_source, deleted, deleted_at FROM media_notes WHERE id = $1
 `
@@ -5909,6 +6095,8 @@ func (q *Queries) GetNextRetryTime(ctx context.Context) (interface{}, error) {
 const GetNotStartedItems = `-- name: GetNotStartedItems :many
 SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence FROM media_items mi
 WHERE ($1::uuid IS NULL OR mi.library_id = $1::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
   AND NOT EXISTS (
     SELECT 1 FROM reading_progress rp
     WHERE rp.media_item_id = mi.id
@@ -6312,6 +6500,8 @@ func (q *Queries) GetReadingSpeed(ctx context.Context, arg GetReadingSpeedParams
 const GetRecentlyAddedItems = `-- name: GetRecentlyAddedItems :many
 SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence FROM media_items mi
 WHERE ($1::uuid IS NULL OR mi.library_id = $1::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY mi.imported_at DESC NULLS LAST, mi.created_at DESC
 LIMIT $2
 `
@@ -6416,6 +6606,8 @@ INNER JOIN (
     ORDER BY media_item_id, last_read_at DESC
 ) rp ON rp.media_item_id = mi.id
 WHERE ($2::uuid IS NULL OR mi.library_id = $2::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY rp.last_read_at DESC
 LIMIT $3
 `
@@ -8419,10 +8611,28 @@ func (q *Queries) ListDevicesByUser(ctx context.Context, userID pgtype.UUID) ([]
 }
 
 const ListHiddenMediaItems = `-- name: ListHiddenMediaItems :many
-SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence, l.name as library_name, lt.name as library_type_name
+SELECT mi.id, mi.library_id, mi.title, mi.author, mi.isbn, mi.description, mi.file_path, mi.file_size, mi.mime_type, mi.cover_image_path, mi.series, mi.series_number, mi.tags, mi.asin, mi.date_published, mi.publisher, mi.contributors, mi.language, mi.edition, mi.page_count, mi.genre, mi.copyright_year, mi.goodreads_id, mi.openlibrary_id, mi.google_books_id, mi.added_by_admin_id, mi.created_at, mi.imported_at, mi.updated_at, mi.format_group, mi.format_mimetype, mi.is_reflowable, mi.has_fixed_layout, mi.total_characters, mi.chapter_count, mi.entitlement_id, mi.revision_number, mi.kobo_content_id, mi.kobo_metadata, mi.manga_type, mi.reading_direction, mi.series_count, mi.volume, mi.imprint, mi.age_rating, mi.web_url, mi.story_arc, mi.is_black_and_white, mi.metadata_notes, mi.community_rating, mi.alternate_info, mi.scan_information, mi.summary, mi.metadata_overrides, mi.missing_scan_count, mi.archived_at, mi.chapter_metadata, mi.library_type_name, mi.tags_search, mi.contributors_search, mi.file_sha256, mi.opf_identifier, mi.opf_uuid, mi.hash_confidence, l.name as library_name, lt.name as library_type_name,
+       twin.id AS match_id, COALESCE(twin.title, '') AS match_title,
+       twin_library.name AS match_library_name
 FROM media_items mi
 JOIN libraries l ON mi.library_id = l.id
 JOIN library_types lt ON l.library_type_id = lt.id
+LEFT JOIN LATERAL (
+    SELECT t.id, t.title, t.library_id
+    FROM media_items t
+    JOIN libraries tl ON t.library_id = tl.id
+    JOIN library_types tlt ON tl.library_type_id = tlt.id
+    WHERE t.file_sha256 = mi.file_sha256
+      AND t.id <> mi.id
+      AND t.archived_at IS NULL
+      AND t.missing_scan_count = 0
+    ORDER BY (tlt.id = lt.id) DESC,
+             (tl.id = l.id) DESC,
+             (SELECT COUNT(*) FROM reading_progress rp WHERE rp.media_item_id = t.id) DESC,
+             t.created_at ASC
+    LIMIT 1
+) twin ON true
+LEFT JOIN libraries twin_library ON twin_library.id = twin.library_id
 WHERE mi.archived_at IS NOT NULL OR mi.missing_scan_count > 0
 ORDER BY mi.archived_at NULLS LAST, mi.updated_at DESC
 `
@@ -8494,11 +8704,17 @@ type ListHiddenMediaItemsRow struct {
 	HashConfidence     pgtype.Text        `db:"hash_confidence" json:"hash_confidence"`
 	LibraryName        string             `db:"library_name" json:"library_name"`
 	LibraryTypeName_2  string             `db:"library_type_name_2" json:"library_type_name_2"`
+	MatchID            pgtype.UUID        `db:"match_id" json:"match_id"`
+	MatchTitle         string             `db:"match_title" json:"match_title"`
+	MatchLibraryName   pgtype.Text        `db:"match_library_name" json:"match_library_name"`
 }
 
 // Items hidden from libraries: either missing from disk (waiting on the
 // second scan that archives them) or already archived and pending purge.
-// Feeds the admin archived-items page.
+// Feeds the admin archived-items page. match_* columns identify an active
+// item with identical content (same SHA-256) so the UI can offer merging the
+// archived row's reading data into its active twin instead of waiting for a
+// file that will never return.
 func (q *Queries) ListHiddenMediaItems(ctx context.Context) ([]ListHiddenMediaItemsRow, error) {
 	rows, err := q.db.Query(ctx, ListHiddenMediaItems)
 	if err != nil {
@@ -8575,6 +8791,9 @@ func (q *Queries) ListHiddenMediaItems(ctx context.Context) ([]ListHiddenMediaIt
 			&i.HashConfidence,
 			&i.LibraryName,
 			&i.LibraryTypeName_2,
+			&i.MatchID,
+			&i.MatchTitle,
+			&i.MatchLibraryName,
 		); err != nil {
 			return nil, err
 		}
@@ -9999,6 +10218,38 @@ func (q *Queries) MoveMediaItemFilePath(ctx context.Context, arg MoveMediaItemFi
 	return err
 }
 
+const MoveMediaItemToLibrary = `-- name: MoveMediaItemToLibrary :exec
+UPDATE media_items
+SET library_id = $2,
+    file_path = $3,
+    file_size = $4,
+    archived_at = NULL,
+    missing_scan_count = 0,
+    updated_at = NOW()
+WHERE id = $1
+`
+
+type MoveMediaItemToLibraryParams struct {
+	ID        pgtype.UUID `db:"id" json:"id"`
+	LibraryID pgtype.UUID `db:"library_id" json:"library_id"`
+	FilePath  string      `db:"file_path" json:"file_path"`
+	FileSize  pgtype.Int8 `db:"file_size" json:"file_size"`
+}
+
+// Cross-library move: identical content reappeared in a different library of
+// the same type while the old file vanished. Repoints the row so reading
+// history, annotations and collections follow the book; archive/missing
+// state is cleared. library_type_name is refreshed by trigger.
+func (q *Queries) MoveMediaItemToLibrary(ctx context.Context, arg MoveMediaItemToLibraryParams) error {
+	_, err := q.db.Exec(ctx, MoveMediaItemToLibrary,
+		arg.ID,
+		arg.LibraryID,
+		arg.FilePath,
+		arg.FileSize,
+	)
+	return err
+}
+
 const PurgeAllArchivedMediaItems = `-- name: PurgeAllArchivedMediaItems :many
 DELETE FROM media_items
 WHERE archived_at IS NOT NULL

internal/database/queries/queries.sql

@@ -328,6 +328,20 @@ WHERE id = $1;
 UPDATE media_items SET archived_at = NOW(), updated_at = NOW()
 WHERE id = $1;
 
+-- name: MoveMediaItemToLibrary :exec
+-- Cross-library move: identical content reappeared in a different library of
+-- the same type while the old file vanished. Repoints the row so reading
+-- history, annotations and collections follow the book; archive/missing
+-- state is cleared. library_type_name is refreshed by trigger.
+UPDATE media_items
+SET library_id = $2,
+    file_path = $3,
+    file_size = $4,
+    archived_at = NULL,
+    missing_scan_count = 0,
+    updated_at = NOW()
+WHERE id = $1;
+
 -- name: ClearMediaItemArchive :exec
 -- File is back on disk (by path or content hash): restore visibility and
 -- reset the missing-scan counter. No-op for items that were never archived.
@@ -353,11 +367,32 @@ SELECT COUNT(*) FROM media_items WHERE archived_at IS NOT NULL;
 -- name: ListHiddenMediaItems :many
 -- Items hidden from libraries: either missing from disk (waiting on the
 -- second scan that archives them) or already archived and pending purge.
--- Feeds the admin archived-items page.
+-- Feeds the admin archived-items page. match_* columns identify an active
-SELECT mi.*, l.name as library_name, lt.name as library_type_name
+-- item with identical content (same SHA-256) so the UI can offer merging the
+-- archived row's reading data into its active twin instead of waiting for a
+-- file that will never return.
+SELECT mi.*, l.name as library_name, lt.name as library_type_name,
+       twin.id AS match_id, COALESCE(twin.title, '') AS match_title,
+       twin_library.name AS match_library_name
 FROM media_items mi
 JOIN libraries l ON mi.library_id = l.id
 JOIN library_types lt ON l.library_type_id = lt.id
+LEFT JOIN LATERAL (
+    SELECT t.id, t.title, t.library_id
+    FROM media_items t
+    JOIN libraries tl ON t.library_id = tl.id
+    JOIN library_types tlt ON tl.library_type_id = tlt.id
+    WHERE t.file_sha256 = mi.file_sha256
+      AND t.id <> mi.id
+      AND t.archived_at IS NULL
+      AND t.missing_scan_count = 0
+    ORDER BY (tlt.id = lt.id) DESC,
+             (tl.id = l.id) DESC,
+             (SELECT COUNT(*) FROM reading_progress rp WHERE rp.media_item_id = t.id) DESC,
+             t.created_at ASC
+    LIMIT 1
+) twin ON true
+LEFT JOIN libraries twin_library ON twin_library.id = twin.library_id
 WHERE mi.archived_at IS NOT NULL OR mi.missing_scan_count > 0
 ORDER BY mi.archived_at NULLS LAST, mi.updated_at DESC;
 
@@ -1898,6 +1933,24 @@ SELECT * FROM media_items WHERE file_sha256 = $1;
 -- name: GetMediaItemBySHA256AndLibrary :one
 SELECT * FROM media_items WHERE file_sha256 = $1 AND library_id = $2;
 
+-- name: GetMediaItemsBySHA256AndSameLibraryType :many
+-- Cross-library move detection: identical content registered in a different
+-- library of the same type (ebooks stay with ebooks, comics with comics).
+-- Candidates may be active copies (deliberate duplicates - leave alone) or
+-- hidden/archived rows whose file vanished (move candidates - the scanner
+-- verifies disk state before repointing).
+SELECT mi.*, lt.name AS library_type_name
+FROM media_items mi
+JOIN libraries l ON mi.library_id = l.id
+JOIN library_types lt ON l.library_type_id = lt.id
+JOIN libraries target_lib ON target_lib.id = sqlc.arg('library_id')
+WHERE mi.file_sha256 = sqlc.arg('file_sha256')
+  AND mi.library_id <> sqlc.arg('library_id')
+  AND lt.id = target_lib.library_type_id
+ORDER BY (mi.archived_at IS NOT NULL) DESC,
+         mi.missing_scan_count DESC,
+         mi.created_at ASC;
+
 -- List all media items sharing a SHA-256 hash within a library (hash conflict group)
 -- name: ListMediaItemsBySHA256AndLibrary :many
 SELECT * FROM media_items WHERE file_sha256 = $1 AND library_id = $2 ORDER BY file_path;
@@ -2143,6 +2196,8 @@ SELECT ci.*, mi.title, mi.author, mi.cover_image_path, mi.library_id
 FROM collection_items ci
 JOIN media_items mi ON ci.media_item_id = mi.id
 WHERE ci.collection_id = $1
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY ci.added_at DESC;
 
 -- Get collections for book
@@ -2449,12 +2504,16 @@ INNER JOIN (
     ORDER BY media_item_id, last_read_at DESC
 ) rp ON rp.media_item_id = mi.id
 WHERE (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY rp.last_read_at DESC
 LIMIT sqlc.narg('limit');
 
 -- name: GetRecentlyAddedItems :many
 SELECT mi.* FROM media_items mi
 WHERE (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY mi.imported_at DESC NULLS LAST, mi.created_at DESC
 LIMIT sqlc.narg('limit');
 
@@ -2468,12 +2527,16 @@ INNER JOIN (
     ORDER BY media_item_id, last_read_at DESC
 ) rp ON rp.media_item_id = mi.id
 WHERE (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY rp.last_read_at DESC
 LIMIT sqlc.narg('limit');
 
 -- name: GetNotStartedItems :many
 SELECT mi.* FROM media_items mi
 WHERE (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
   AND NOT EXISTS (
     SELECT 1 FROM reading_progress rp
     WHERE rp.media_item_id = mi.id
@@ -2488,12 +2551,16 @@ SELECT mi.*, ci.excluded FROM media_items mi
 INNER JOIN collection_items ci ON ci.media_item_id = mi.id
 WHERE ci.collection_id = sqlc.narg('collection_id')
   AND (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY ci.added_at DESC
 LIMIT sqlc.narg('limit');
 
 -- name: GetLibraryItems :many
 SELECT mi.* FROM media_items mi
 WHERE (sqlc.narg('library_id')::uuid IS NULL OR mi.library_id = sqlc.narg('library_id')::uuid)
+  AND mi.archived_at IS NULL
+  AND mi.missing_scan_count = 0
 ORDER BY mi.created_at DESC;
 
 -- name: GetDistinctSeries :many