Filip f42ecf5c5b Add message retention and hide emails by default ...

- db: cleanup_old_messages(days) purges messages older than N days in
  batches; recipients/reads/deliveries/reactions follow via ON DELETE
  CASCADE. Returns attachment file_ids no longer referenced by any
  surviving message (forwarded copies keep their files) and removes
  their image_uploads rows
- server: MESSAGE_RETENTION_DAYS env var (default 0 = keep forever);
  hourly cleanup deletes expired messages and securely removes orphaned
  attachment blobs from the upload dir
- schema: email_visible now defaults to 0 — previously any logged-in
  user who knew a UUID could read another user's email via get_profile
- migrations: SQL script to apply the new default and reset the flag on
  existing databases (run manually, see file header)
- docker-compose: document MESSAGE_RETENTION_DAYS

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-06-12 10:30:42 +02:00

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