first add

backend/app/core/logging.py

@@ -0,0 +1,14 @@
+import logging
+import sys
+
+
+def setup_logging(level: str = "INFO", fmt: str = "%(asctime)s - %(name)s - %(levelname)s - %(message)s") -> None:
+    handler = logging.StreamHandler(sys.stdout)
+    formatter = logging.Formatter(fmt)
+    handler.setFormatter(formatter)
+    root = logging.getLogger()
+    if not root.handlers:
+        root.addHandler(handler)
+    root.setLevel(level)
+
+