build ocr

backend/src/db.ts

@@ -34,6 +34,7 @@ db.exec(`
     height        INTEGER NOT NULL,
     parent_id     TEXT REFERENCES memes(id) ON DELETE CASCADE,
     collection_id INTEGER REFERENCES collections(id) ON DELETE SET NULL,
+    ocr_text      TEXT,
     created_at    TEXT NOT NULL DEFAULT (datetime('now'))
   );
 
@@ -54,15 +55,22 @@ db.exec(`
   CREATE INDEX IF NOT EXISTS idx_meme_tags_tag_id ON meme_tags(tag_id);
 `);
 
-// Migration: add collection_id column if upgrading from earlier schema
-// Must run BEFORE creating the index on that column
+// Migrations — run after CREATE TABLE IF NOT EXISTS so they only apply to existing DBs
 const memesCols = db.prepare('PRAGMA table_info(memes)').all() as { name: string }[];
+
 if (!memesCols.find((c) => c.name === 'collection_id')) {
   db.exec('ALTER TABLE memes ADD COLUMN collection_id INTEGER REFERENCES collections(id) ON DELETE SET NULL');
 }
 
-// Create index after the column is guaranteed to exist (handles both fresh and migrated DBs)
-db.exec('CREATE INDEX IF NOT EXISTS idx_memes_collection_id ON memes(collection_id)');
+if (!memesCols.find((c) => c.name === 'ocr_text')) {
+  db.exec('ALTER TABLE memes ADD COLUMN ocr_text TEXT');
+}
+
+// Indexes that depend on migrated columns — created after columns are guaranteed to exist
+db.exec(`
+  CREATE INDEX IF NOT EXISTS idx_memes_collection_id ON memes(collection_id);
+  CREATE INDEX IF NOT EXISTS idx_memes_ocr ON memes(ocr_text) WHERE ocr_text IS NOT NULL;
+`);
 
 // Seed the default UNSORTED collection
 const defaultCollection = db