diff --git a/extension/AttendanceTracker/build/Dockerfile.build b/extension/AttendanceTracker/build/Dockerfile.build
new file mode 100644
index 0000000..3e3d906
--- /dev/null
+++ b/extension/AttendanceTracker/build/Dockerfile.build
@@ -0,0 +1,11 @@
+# build Golang app for Linux
+FROM golang:1.20
+
+WORKDIR /app
+
+# get gcc-multilib and gcc-mingw-w64
+RUN apt update
+RUN apt install -y gcc-multilib gcc-mingw-w64
+
+CMD ["/bin/sh"]
+
diff --git a/extension/AttendanceTracker/cmd/main.go b/extension/AttendanceTracker/cmd/main.go
index 31a2cca..134fa1b 100644
--- a/extension/AttendanceTracker/cmd/main.go
+++ b/extension/AttendanceTracker/cmd/main.go
@@ -313,8 +313,8 @@ func writeAttendance(data string) {
 	var dbEvent Session
 	db.Client().
 		Where(
-			"player_uid = ? AND mission_hash = ?",
-			event.PlayerUID,
+			"player_id = ? AND mission_hash = ?",
+			event.PlayerId,
 			event.MissionHash,
 		).
 		Order("join_time_utc desc").