added RaG

web/backend/app/main.py

@@ -14,11 +14,19 @@ import app.models  # noqa: F401 — register models
 async def lifespan(_: FastAPI):
     settings = get_settings()
     Path(settings.data_dir).mkdir(parents=True, exist_ok=True)
-    Base.metadata.create_all(bind=engine)
+    from sqlalchemy import text
+
     from app.core.schema_migrate import ensure_schema
     from app.core.auth import ensure_admin_user
     from app.core.database import SessionLocal
 
+    # pgvector must exist before create_all for Vector columns
+    try:
+        with engine.begin() as conn:
+            conn.execute(text("CREATE EXTENSION IF NOT EXISTS vector"))
+    except Exception:
+        pass
+    Base.metadata.create_all(bind=engine)
     ensure_schema(engine)
     db = SessionLocal()
     try: