docs: def _init_map(self):
          """stub"""
          SimpleDifficultyItemFormRecord._init_map(self)
          SourceItemFormRecord._init_map(self)
          PDFPreviewFormRecord._init_map(self)
          PublishedFormRecord._init_map(self)
          ProvenanceFormRecord._init_map(self)
          super(MecQBankBaseMixin, self)._init_map()