Replace the give-up-after-3-retries path with a persistent background
scheduler: 10 retries every 30s (5 min), then 12 retries every 5 min
(1 hr). Active timers are keyed by origin so rapid password changes
cancel and replace the previous loop. All timers are cleared on logout
via clearPasswordSyncTimers() called from instanceStore.reset().
- Add account deletion with tombstone (isDeleted flag), password/username
confirmation, owned-space guard, and full cleanup transaction
- Free deleted usernames by renaming to !deleted:<id> so they can be reused
- Add migration to retroactively free usernames from already-tombstoned users
- Add GET /api/auth/check-username endpoint with rate limiting for real-time
availability checking during registration
- Add debounced username availability indicator on registration Step 1
- Add DeleteAccountModal with federation-aware remote account cleanup
- Add federation ops utility for remote instance management
- Update sanitizeUser to anonymize deleted user profiles
- Add instance store improvements and connected instances modal updates
Jannis Braun