fix: Add automatic database migration for missing columns

- Add run_migrations() function that runs at app startup
- Automatically adds price_selector column to search_sites if missing
- Prevents UndefinedColumn errors on existing databases

app/main.py

@@ -9,7 +9,9 @@ from fastapi.responses import FileResponse
 from fastapi.staticfiles import StaticFiles
 from slowapi import _rate_limit_exceeded_handler
 from slowapi.errors import RateLimitExceeded
+from sqlalchemy import text
 
+from app.database import engine
 from app.limiter import limiter
 from app.routers import items, jobs, notifications, openrouter, search, search_sites, settings
 from app.services.scheduler_service import scheduled_refresh, scheduler
@@ -22,8 +24,34 @@ logging.basicConfig(
 logger = logging.getLogger(__name__)
 
 
+def run_migrations():
+    """Run database migrations for missing columns"""
+    migrations = [
+        # Add price_selector to search_sites if missing
+        ("search_sites", "price_selector", "ALTER TABLE search_sites ADD COLUMN price_selector VARCHAR(512)"),
+    ]
+
+    with engine.connect() as conn:
+        for table, column, sql in migrations:
+            result = conn.execute(text(
+                f"SELECT 1 FROM information_schema.columns WHERE table_name = '{table}' AND column_name = '{column}'"
+            ))
+            if not result.fetchone():
+                logger.info(f"Adding missing column: {table}.{column}")
+                conn.execute(text(sql))
+                conn.commit()
+
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
+    # Run database migrations
+    logger.info("Running database migrations...")
+    try:
+        run_migrations()
+        logger.info("Database migrations completed")
+    except Exception as e:
+        logger.error(f"Migration error: {e}")
+
     logger.info("Starting smart scheduler (Heartbeat: 1 minute)")
     scheduler.add_job(scheduled_refresh, IntervalTrigger(minutes=1), id="refresh_job", replace_existing=True)
     scheduler.start()