feat: new file

backend/app/routes/debug.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from fastapi import APIRouter, Query
+
+from ..services.db_sample import print_db_sample_to_logs
+
+
+router = APIRouter()
+
+
+@router.post("/db-sample")
+def db_sample(limit: int = Query(10, ge=1, le=200)):
+    """
+    触发一次“数据库样例打印到后端日志”，用于快速理解数据内容与结构。
+    """
+    print_db_sample_to_logs(limit=limit)
+    return {"ok": True, "printed": True, "limit": limit}
+