Create a script that runs new field migrations

[MaxwellBo]

There's a bunch of datatypes where I've added a new field to the schema but did not go back and update all the old instances.

You can find the value that should replace undefined in the DEFAULT_(.+) instances.

Make a backup of the database before performing this migration.

After the migration has been done, remove the undefined checks that were added to deal with the fact that the data lookups may have previously failed but will no longer.