text: from tortoise import fields
  from tortoise.backends.base.schema_generator import BaseSchemaGenerator
  
  
  class SqliteSchemaGenerator(BaseSchemaGenerator):
      def __init__(self, *args, **kwargs):
          super().__init__(*args, **kwargs)
          self.FIELD_TYPE_MAP.update({
              fields.BooleanField: 'INTEGER',
              fields.FloatField: 'REAL',
              fields.DecimalField: 'VARCHAR(40)',
          })
  
      def _get_primary_key_create_string(self, field_name):
          return '"{}" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL'.format(field_name)
  