Cache embed thumbnails in download mode

media-scrape/src/store.ts

@@ -294,11 +294,19 @@ export class ScrapeStore {
         this.db.prepare("UPDATE media SET download_error = ? WHERE id = ?").run(error.slice(0, 200), id);
     }
 
-    /** Image and GIF rows that still need a cached preview. */
-    pendingPreviews(limit = 5000): MediaRow[] {
+    /**
+     * Rows that still need a cached preview. Attachment/sticker images and GIFs always;
+     * embed thumbnails only when `includeEmbeds` is set (download mode).
+     */
+    pendingPreviews(limit = 5000, includeEmbeds = false): MediaRow[] {
+        const local = "(kind IN ('image', 'gif') AND (source IS NULL OR source != 'embed'))";
+        const condition = includeEmbeds
+            ? `(${local} OR (source = 'embed' AND preview_url IS NOT NULL))`
+            : local;
+
         return this.db
             .prepare(
-                "SELECT * FROM media WHERE (kind = 'image' OR kind = 'gif') AND preview_hash IS NULL AND preview_error IS NULL ORDER BY id LIMIT ?"
+                `SELECT * FROM media WHERE ${condition} AND preview_hash IS NULL AND preview_error IS NULL ORDER BY id LIMIT ?`
             )
             .all(limit) as unknown as MediaRow[];
     }