fix some bugs

- use writeConnect all the time unless filling old entries
- update column names to clarify UTC datetime
- GORM omit Mission association for server events that won't have one
- add disconnectDB function to reinit while active

.gitignore

@@ -6,3 +6,5 @@ config.json
 **/AttendanceTracker_x64.h
 **/AttendanceTracker.h
 /extension/@AttendanceTracker/
+
+\@AttendanceTracker.7z