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a481191db2
* migratex api uses tx now instead of db we want to be able to do external queries outside of the migration itself inside of the same transaction for version checking. if we don't do this, we risk the case where we set the version to the latest but we don't run the table creates at all, so we have a db that thinks it's up to date but doesn't even have any tables, and on subsequent boots if a migration slides in then the migrations will run when there are no tables. it was unlikely, but now it's dead. * tx friendly table exists check the previous existence checker for dbs was relying on getting back errors about the db not existing. if we use this in a tx, it makes the whole tx invalid for postgres. so, now we have count the table queries which return a 1 or a 0 instead of a 1 or an error so that we can check existence inside of a transaction. voila.