I have the same problem and i think i have found a workaround.
In my case, the issue was caused by the regular backups that Enpass creates automatically. If you go to the backup function in the Enpass settings, you can view “Previous Backups.” From there, you can delete old backups. Depending on the size of your Enpass database, the backups can also be quite large.
Suggestion for Enpass!
I would appreciate an option to set the maximum number of backups or define retention periods — for example, keeping the last 7 days as well as one backup per month, and automatically cleaning up everything older than that.