Google drive mount overwrites file instead of modifying it

welcome to the forum,

afiak, that is how rclone works, depending on --vfs-cache-mode
if you edit/modify a file, then

  1. rclone downloads the entire file from gdrive to local
  2. keepass open, edits, saves the local file
  3. rclone uploads the entire file, from local to gdrive

how are you doing that, rclone or what?