comic library improvements

src/lib/scanner.ts

@@ -552,6 +552,36 @@ async function scanComics(library: Library, libraryRoot: string): Promise<void>
   const db = getDb()
   const now = Date.now()
 
+  // Save ComicInfo metadata for issues that were already imported so we can
+  // restore it after the clear+upsert without re-reading any CBZ files.
+  type SavedInfo = { title: string | null; year: number | null; genres: string | null; comicFields: Record<string, unknown> }
+  const savedComicInfo = new Map<string, SavedInfo>()
+  {
+    const rows = db
+      .prepare(
+        `SELECT item_key, title, year, genres, metadata FROM media_items
+         WHERE library_id = ? AND item_type = 'comic_issue'
+           AND (year IS NOT NULL OR genres IS NOT NULL)`
+      )
+      .all(library.id) as { item_key: string; title: string | null; year: number | null; genres: string | null; metadata: string | null }[]
+    for (const row of rows) {
+      const meta: Record<string, unknown> = row.metadata ? (JSON.parse(row.metadata) as Record<string, unknown>) : {}
+      savedComicInfo.set(row.item_key, {
+        title: row.title,
+        year: row.year,
+        genres: row.genres,
+        comicFields: {
+          writer: meta.writer,
+          publisher: meta.publisher,
+          translator: meta.translator,
+          web: meta.web,
+          month: meta.month,
+          day: meta.day,
+        },
+      })
+    }
+  }
+
   clearLibraryItems(db, library.id)
 
   const upsertSeries = db.prepare(`
@@ -648,6 +678,18 @@ async function scanComics(library: Library, libraryRoot: string): Promise<void>
     }
   }
 
+  // Build a map of item_key → fresh scan metadata (needed for ComicInfo restore below).
+  const freshMetaMap = new Map<string, Record<string, unknown>>()
+  for (const entry of allRecords) {
+    if (entry.type === 'issue') {
+      const rec = entry.rec as { item_key: unknown; metadata: unknown }
+      freshMetaMap.set(
+        String(rec.item_key),
+        JSON.parse(String(rec.metadata)) as Record<string, unknown>
+      )
+    }
+  }
+
   // Insert in batches of 500, yielding the event loop between batches so the app
   // remains responsive to HTTP requests during a large scan.
   const BATCH_SIZE = 500
@@ -662,6 +704,23 @@ async function scanComics(library: Library, libraryRoot: string): Promise<void>
     await new Promise<void>((r) => setImmediate(r))
   }
 
+  // Restore previously-imported ComicInfo data for issues that still exist on disk.
+  // Merges scan-derived fields (pageCount, coverUrl) with the saved ComicInfo fields
+  // so neither set of data is lost. Title from ComicInfo is also preserved.
+  if (savedComicInfo.size > 0) {
+    const restoreStmt = db.prepare(
+      'UPDATE media_items SET title = @title, year = @year, genres = @genres, metadata = @metadata WHERE item_key = @item_key'
+    )
+    db.transaction(() => {
+      for (const [item_key, saved] of savedComicInfo) {
+        const freshMeta = freshMetaMap.get(item_key)
+        if (!freshMeta) continue // file was removed from disk
+        const merged = { ...freshMeta, ...saved.comicFields }
+        restoreStmt.run({ item_key, title: saved.title, year: saved.year, genres: saved.genres, metadata: JSON.stringify(merged) })
+      }
+    })()
+  }
+
   // Prewarm CBZ cover thumbnails — fire-and-forget so they don't block scan completion.
   for (const item of items) {
     const issuesToWarm: ComicIssue[] = 'issues' in item