adding sqlite to multidb

    @staticmethod

    def _get_mixin_for_type(

        db_type: str,

    ) -> Optional[Type[Union["PostgresMixin", "MSSQLMixin", "InfluxMixin"]]]:

    ) -> Optional[Type[Union['PostgresMixin', 'MSSQLMixin', 'InfluxMixin', 'SQLiteMixin']]]:

        db_type = db_type.lower()

        if db_type.startswith("postgres") or db_type.startswith("pg"):

            from common.mixins.postgres import PostgresMixin

            from common.mixins.influx import InfluxMixin

            return InfluxMixin

        if db_type.startswith('sqlite'):

            from common.mixins.sqlite import SQLiteMixin

            return SQLiteMixin

        # add more database Mixins here as they become available

        return None

    The default `search_path` is not applicable here since SQLite does not use schemas.

    """

    DEFAULT_DB = ce("DATABASE_DB_SQLITE", ":memory:")

    DEFAULT_DB = ce("DATABASE_DB_SQLITE", ce('DATABASE_DB', ":memory:"))

    def open(self):

        """Explicitly open the database connection