Convert the bulk-delete hard deleteMany to a soft-delete updateMany that sets
deletedAt and bumps syncVersion, matching the single-event DELETE handler so a
multi-select removal surfaces each row as a tombstone on the sync delta feed
to clients offline at delete time. The where clause now scopes deletedAt:null
so a re-post of already-removed ids counts zero.
Marc-André Bombeck
0aa5cb5ea1