Postgres:
- Change page_namespace from smallint to int
- Change page_random from numeric with arbitrary precision to float
- Make page_touched not nullable
MySQL/SQLite:
- Change datatype of page_title from varchar (with binary collation)
to varbinary(255)
- Drop default empty string from timestamp field of page_touched
Bug: T230428
Bug: T164898
Change-Id: Ibdaf332ea1da309d31d35a6ebbc1b8fefced335e
6a3aa5b5a2