Tombstone
A marker that records a deletion, so other devices or replicas learn that the item was deleted.
Definition
In sync and replication, simply removing a row leaves nothing for other copies to receive, so they keep the item and may even restore it. A tombstone is a soft-deleted row or a delete event in the change feed that is kept for a retention period. Devices that have been offline longer than that period must do a full resync.
In practice
Deleting a note sets isDeleted = true; every device sees the change on its next sync and removes the note from its local database.
Learn it in context
Lessons that use this term.