class_docstr: The base class of the :attr:`.SQLAlchemy.Model` declarative model class.
  
  To define models, subclass :attr:`db.Model <.SQLAlchemy.Model>`, not this. To
  customize ``db.Model``, subclass this and pass it as ``model_class`` to
  :class:`.SQLAlchemy`. To customize ``db.Model`` at the metaclass level, pass an
  already created declarative model class as ``model_class``.
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code: def __repr__(self) -> str:
      state = sa.inspect(self)
      assert state is not None
  
      if state.transient:
          pk = f"(transient {id(self)})"
      elif state.pending:
          pk = f"(pending {id(self)})"
      else:
          pk = ", ".join(map(str, state.identity))
  
      return f"<{type(self).__name__} {pk}>"
  
imports: from __future__ import annotations
  import re
  import typing
  import sqlalchemy
  import sqlalchemy.orm
  from .query import Query
label_desc: Use image node_id 1 for calling the Model obj's underlying member method code with example usage: obj.__repr__() and returns: str, type, str, pk, str