In order to migrate MySQL and Sqlite to abstract schema changed the
ll_title data type from varchar binary to varbinary. This wouldn't
affect production.
For migrating Postgres:
- Dropping foreign key on ll_from
- Setting default of empty string for ll_lang and ll_title
- Make ll_lang and ll_title both non-nullable to be in sync with MySQL
- Turning the unique index to primary key, similar to MySQL
- Renaming an index to sync with MySQL
Bug: T164898
Bug: T230428
Change-Id: I57f22896ff67266f99bf08f6dd1b9cc4c51b1db9
