- Logged IPs are kept forever. However, not all IPs that you use to access the forum end up getting logged.
- There are no per-user access logs (aside from what you're doing
now, the last-read post in topics, etc.). There are normal web server access logs, but these can't be reliably tied to specific users; these logs tend to be deleted after a month, but no guarantees.
- Deleted posts are kept forever. Edit logs are kept forever. But if I ever start running low on space, I reserve the right to delete some of this.
- PMs are deleted from the database when everyone who can read the PM deletes it, except for certain users who for legal reasons have additional retention. These users are warned of this condition (except where required by law), though there's no warning when communicating with such users.
- Changes/deletions to trust ratings and settings are currently not saved.
Note also that data deleted from the database may still exist in backups, potentially forever.