tree 5a6df1508209553fa75150cbe268083a07212b20
parent efb8b836660bd367744c406b1a3ce7f20561e000
author Sunny Goyal <sunnygoyal@google.com> 1540846940 -0700
committer Sunny Goyal <sunnygoyal@google.com> 1546539944 -0800

Adding support for backing up favorites table

Favorites table is copied as a separate table name during the first grid migration.
On subsequent migrations this backup table is used if it exists, otherwise new
backup is created. The backup table is also removed if there is any insert or
delete operation on the db (outside of the migration operation itself).

Bug: 111850268
Bug: 121048571
Change-Id: I6f02f4a355c369ee99d89430971be258f7516f6e