Build 2901262240: cache users

backend/app/db.py

@@ -581,7 +581,7 @@ def set_jellyfin_auth_cache(username: str, password: str) -> None:
             """
             UPDATE users
             SET jellyfin_password_hash = ?, last_jellyfin_auth_at = ?
-            WHERE username = ?
+            WHERE username = ? COLLATE NOCASE
             """,
             (password_hash, timestamp, username),
         )