fix: backfill key_signal_type without sqlite3.Row in init_db

Use tuple indices because init_db connects before row_factory is set.

Co-authored-by: Cursor <cursoragent@cursor.com>

fib_key_monitor_lib.py

@@ -101,8 +101,9 @@ def backfill_missing_key_signal_types(conn, *, monitor_type: str = KEY_MONITOR_T
         (mt,),
     ).fetchall()
     for row in rows:
-        sym = row["symbol"]
-        opened = (row["opened_at"] or "").strip()
+        # init_db 连接未设 row_factory，结果为 tuple
+        rid, sym, opened_at = row[0], row[1], row[2]
+        opened = (opened_at or "").strip()
         for signal in KEY_MONITOR_AUTO_TYPES:
             hist = conn.execute(
                 """SELECT monitor_type FROM key_monitor_history
@@ -115,7 +116,7 @@ def backfill_missing_key_signal_types(conn, *, monitor_type: str = KEY_MONITOR_T
                 continue
             conn.execute(
                 "UPDATE trade_records SET key_signal_type=? WHERE id=?",
-                (signal, row["id"]),
+                (signal, rid),
             )
             updated += 1
             break