cloud: production gaps (worker loop + true cancel, task result columns + migration, DB interface migration, metrics + backup)

cloud/auth.py

@@ -24,6 +24,7 @@ approve_merge -> maintainer，manage_project -> owner（仅 owner）。
 import hashlib
 import secrets
 import sqlite3
+from cloud.db import connect as _db_connect
 import time
 import uuid
 
@@ -44,7 +45,7 @@ class AuthStore:
 
     def __init__(self, db_path):
         self.db_path = str(db_path)
-        self.conn = sqlite3.connect(self.db_path)
+        self.conn = _db_connect(self.db_path)
         self.conn.execute(
             "CREATE TABLE IF NOT EXISTS users("
             "id TEXT PRIMARY KEY, "