fix

backend/Dockerfile

@@ -20,8 +20,10 @@ COPY . .
 EXPOSE 8000
 
 # Default: run uvicorn with hot reload for dev.
-# We pass --log-level explicitly from $LOG_LEVEL so uvicorn's own loggers
-# (uvicorn, uvicorn.access) start at the right level from the very first
-# request — without this, they stay at INFO until our lifespan runs.
-# Shell form (not exec form) so ${LOG_LEVEL} is interpolated by the shell.
-CMD sh -c 'exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload --log-level "${LOG_LEVEL:-info}"'
+# We pass --log-level explicitly from $LOG_LEVEL (lowercased) so uvicorn's own
+# loggers (uvicorn, uvicorn.access) start at the right level from the very
+# first request — without this, they stay at INFO until our lifespan runs.
+# uvicorn only accepts lowercase values ('critical'|'error'|'warning'|'info'|'debug'|'trace'),
+# so we pipe through `tr` to lowercase. Shell form (not exec form) for ${LOG_LEVEL}
+# interpolation.
+CMD sh -c 'LVL="${LOG_LEVEL:-info}"; exec uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload --log-level "$(printf "%s" "$LVL" | tr "A-Z" "a-z")"'