def __init__(self, connection_hashes, database_handler):
        self.is_debug_printing = False
        self.queued_scripts_collection = QueuedScriptCollection()
        self.database_handler = database_handler
        self.tracking_table_created_for_connections = []
        self.connection_hashes = connection_hashes
Field Test for when No Default, Null & Unique
dataset/ETHPy150Open jzohrab/DbMigrator/dbMigrator/migrator.py/ScriptRunner.__init__--crossover with--dataset/ETHPy150Open stefanfoulis/django-phonenumber-field/testproject/testapp/tests.py/PhonenumerFieldAppTest.test_save_unique_null_none_phone_to_database