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

cloud/memory.py

@@ -14,6 +14,7 @@ Design notes:
 
 import json
 import sqlite3
+from cloud.db import connect as _db_connect
 import time
 
 
@@ -22,7 +23,7 @@ class MemoryStore:
 
     def __init__(self, db_path):
         self.db_path = db_path
-        self.conn = sqlite3.connect(db_path)
+        self.conn = _db_connect(db_path)
         self.conn.row_factory = sqlite3.Row
         self.conn.execute(
             """CREATE TABLE IF NOT EXISTS summaries(