diff --git a/backend/data/hll_vietnam_dev.writer.lock b/backend/data/hll_vietnam_dev.writer.lock
new file mode 100644
index 0000000..342a6cd
--- /dev/null
+++ b/backend/data/hll_vietnam_dev.writer.lock
@@ -0,0 +1,8 @@
+{
+  "lock_token": "3b2e9b3e3e614fefa86d9e14e4e820ad",
+  "holder": "app.historical_runner refresh:all-servers [/app/app/historical_runner.py --hourly]",
+  "started_at": "2026-03-25T11:23:47.790251Z",
+  "hostname": "2a2c611b2eca",
+  "pid": 1,
+  "cwd": "/app"
+}