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This will later be used to expand matching linkifier patterns. Making it nullable for now, but we will make it required in the APIs. As a part of this transition, we temporarily make url_format_string nullable as well, which will be later removed. This allows us to switch to populating url_template without caring about passing url_format_string. Note that the validators are imported in the migration because Django otherwise diffs it and considers the schema to be different, generating a migration, failing the "tools/test-migrations" test. Signed-off-by: Zixuan James Li <p359101898@gmail.com>