fix

backend/db.py

@@ -89,6 +89,17 @@ def init_schema(conn: sqlite3.Connection) -> None:
         )
     """)
     cur.execute("CREATE INDEX IF NOT EXISTS idx_sync_messages_key ON sync_messages(key)")
+    # 回调原始 body 落库，便于回溯与统计
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS callback_log (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            key TEXT NOT NULL,
+            received_at TEXT NOT NULL,
+            raw_body TEXT
+        )
+    """)
+    cur.execute("CREATE INDEX IF NOT EXISTS idx_callback_log_key ON callback_log(key)")
+    cur.execute("CREATE INDEX IF NOT EXISTS idx_callback_log_received ON callback_log(received_at)")
     # 模型配置
     cur.execute("""
         CREATE TABLE IF NOT EXISTS models (