feat: alert wecom when no designer is available

db/pending_transfer_db.py

@@ -160,3 +160,15 @@ def retry_pending_transfer(row_id: int, delay_seconds: int = 60, error: str = ""
             (next_s, now_s, error[:500], row_id),
         )
         conn.commit()
+
+
+def count_open_pending_transfers() -> int:
+    with _get_conn() as conn:
+        row = conn.execute(
+            """
+            SELECT COUNT(*) AS cnt
+            FROM pending_transfers
+            WHERE status IN ('pending', 'processing')
+            """
+        ).fetchone()
+    return int(row["cnt"] or 0) if row else 0