add ai job queue

src/lib/db.ts

@@ -105,6 +105,7 @@ function initDb(db: Database.Database): void {
   migrateMediaItemsAiTagged(db)
   migrateMediaItemsAiFields(db)
   migrateLibraryAiSettings(db)
+  migrateAiJobs(db)
   seedAppSettings(db)
 }
 
@@ -117,6 +118,7 @@ function seedAppSettings(db: Database.Database): void {
     ai_endpoint: '',
     ai_model: '',
     preferred_language: 'English',
+    ai_max_retries: '3',
   }
   const insert = db.prepare(
     'INSERT OR IGNORE INTO app_settings (key, value) VALUES (?, ?)'
@@ -298,3 +300,25 @@ function migrateLibrariesType(db: Database.Database): void {
     `)
   }
 }
+
+function migrateAiJobs(db: Database.Database): void {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS ai_jobs (
+      id           TEXT PRIMARY KEY,
+      item_key     TEXT NOT NULL,
+      library_id   TEXT NOT NULL,
+      job_type     TEXT NOT NULL CHECK(job_type IN ('tag','describe','extract','translate')),
+      status       TEXT NOT NULL DEFAULT 'queued' CHECK(status IN ('queued','running','completed','failed')),
+      error        TEXT,
+      attempt      INTEGER NOT NULL DEFAULT 0,
+      max_retries  INTEGER NOT NULL DEFAULT 3,
+      created_at   INTEGER NOT NULL,
+      started_at   INTEGER,
+      completed_at INTEGER,
+      item_title   TEXT
+    );
+
+    CREATE INDEX IF NOT EXISTS ai_jobs_status ON ai_jobs(status);
+    CREATE INDEX IF NOT EXISTS ai_jobs_created_at ON ai_jobs(created_at);
+  `)
+}