The privacy filter only catches new messages. Two new MessageStore
methods support a one-shot retroactive sweep: GetMessageCountsByChatType
returns a (ChatType, count) snapshot so the UI can preview the impact,
and CleanupRetainOnly hard-deletes everything outside the supplied
allowlist and runs VACUUM to reclaim disk space.
The Privacy tab gains a new section with a refresh-preview button, a
keep/delete summary, a per-channel breakdown tree, and a Ctrl+Shift
confirm. The cleanup runs on a background thread so a 800+ MB VACUUM
does not block the settings UI; tabs are rebuilt via the framework
thread once the delete finishes. The cleanup deliberately uses the
saved Plugin.Config whitelist (not unsaved Mutable edits) so it stays
consistent with the prospective filter.
JonKazama-Hellion
2401ea5864