docs: def create(self, columns=None, type_map=None, overwrite=False):
          """Create a new database with a certain schema."""
          # Check already exists #
          if self.count_bytes > 0:
              if overwrite: self.remove()
              else: raise Exception("File exists already at '%s'" % self)
          # If we want it empty #
          if columns is None:
              self.touch()
          # Make the table #
          else:
              self.add_table(self.main_table, columns=columns, type_map=type_map)