diff --git a/.gitignore b/.gitignore
index 0acdd24..e88159b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,7 @@ test_output.json
 # OS
 .DS_Store
 Thumbs.db
+
+# SQLite WAL/SHM
+*.db-wal
+*.db-shm
diff --git a/backend/jiaoyu.db-shm b/backend/jiaoyu.db-shm
deleted file mode 100644
index 269cd3f..0000000
Binary files a/backend/jiaoyu.db-shm and /dev/null differ
diff --git a/backend/jiaoyu.db-wal b/backend/jiaoyu.db-wal
deleted file mode 100644
index dffc61f..0000000
Binary files a/backend/jiaoyu.db-wal and /dev/null differ