Abstract: A first calendar of a first user can be stored in a database system. The first calendar may include a plurality of event records. A delete command may be received to delete at least a first portion of the first calendar. The at least a first portion of the first calendar may be marked as deleted by one or more flags. After marking, the at least a first portion of the first calendar may be updated in response to a change made to a second event record of a second calendar of a second user. A recover command may be received to recover the at least a portion of the first calendar. The one or more flags may be changed to indicate that the at least a portion of the first calendar is not deleted. The first event record may be provided to the first user with the changed information.