🔇(backend) silence expected 401 warnings on /me

On a busy morning, `/me` alone produced 72k warning logs — 97% of
all warnings. They all come from anonymous requests to `/me`
without credentials, which is normal: `/me` is how the app
determines the current auth status.

These warnings carry no diagnostic value on this endpoint, so
silence them there to cut down on log volume.

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to
 
 - 🔒️(backend) enforce display name setting on rename API
 
+### Changed
+
+- 🔇(backend) silence expected 401 warnings on /me
+
 ## [1.31.0] - 2026-09-08
 
 ### Added

src/backend/core/logging_filters.py

@@ -0,0 +1,21 @@
+"""Logging filters for the core application."""
+
+import logging
+
+
+class SilenceExpected401(logging.Filter):
+    """Drop the expected 401 from anonymous hits on the /me endpoint.
+
+    The frontend probes `/users/me/` to check authentication; a 401 for
+    anonymous users is normal, not a warning worth logging.
+    """
+
+    def filter(self, record):
+        """Return False for a 401 on `/users/me`."""
+        if getattr(record, "status_code", None) == 401:
+            request = getattr(record, "request", None)
+            path = getattr(request, "path", "") or ""
+            if path.rstrip("/").endswith("/users/me"):
+                return False
+
+        return True

src/backend/meet/settings.py

@@ -1122,10 +1122,16 @@ class Base(Configuration):
                 "style": "{",
             },
         },
+        "filters": {
+            "silence_expected_401": {
+                "()": "core.logging_filters.SilenceExpected401",
+            },
+        },
         "handlers": {
             "console": {
                 "class": "logging.StreamHandler",
                 "formatter": "simple",
+                "filters": ["silence_expected_401"],
             },
         },
         # Override root logger to send it to console