Cloned from launchpad blueprint https://blueprints.launchpad.net/glance/+spec/db-cleanup.

Description:

This is the base BP for others BP, that should collect all other BPs around DB.

This work was done in nova and should be done in Glance also:

1) use oslo db code 
2) provide unique constraints
3) shadow tables, to remove deleted rows from table
4) migration tests on all backends with real data
in feature (after nova implementation):
5) sync db models with real tables after db-migrations and add tests that checks this.
6) check indexes (add or remove for better performance)




Specification URL (additional information):

None