diff --git a/app/main.py b/app/main.py
index 16ee15d..be7e79d 100644
--- a/app/main.py
+++ b/app/main.py
@@ -233,10 +233,12 @@ async def lifespan(app: FastAPI):
                     except Exception as exc:
                         logger.warning(f"[STARTUP] Plugin {name} activation issue for tenant {tenant_id}: {exc}")
                         await db.rollback()
+                        db.expunge_all()  # Clear pending objects from failed INSERT
                         break
             except Exception as exc:
                 logger.warning(f"[STARTUP] Plugin {name} activation failed: {exc}")
                 await db.rollback()
+                db.expunge_all()
 
             plugin_record.status = "active"
             logger.info(f"[STARTUP] Activated plugin: {name}")