drop MariaDB support
The reasoning for dropping MariaDB support was summarized on pulp-dev list.
In Pulpcore and Plugins, we should change CharField back to TextField where applicable. The only reason we used CharField was because MySQL cannot have an index on an unbounded text field.
In PostgreSQL this is not a limitation. There's no reason to use a 'varchar' type instead of a 'text' type unless you want a limit on the length of the text. They have identical performance (except for the overhead of the length check on 'varchar')
We should decide whether having a length limit on the field provides any value and remove it if not.
I don't see a compelling reason to switch back to autoincrement PKs despite the fact that we only moved away from them to begin with due to MySQL support.
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