'TableChain' object has no attribute 'join'

[xlsun79]

Describe the bug
When trying cautious delete with the TrodesPosV1 table, it reported a "'TableChain' object has no attribute 'join'" error. I couldn't find a join method in the TableChain class, so was wondering if this is a general problem of how TableChain was defined in dj_graph.py. How could I fix this?
To Reproduce

import spyglass.position as sgp
(sgp.v1.TrodesPosV1()&{'nwb_file_name':'BraveLu20240513_.nwb'}).cautious_delete()

Error Stack

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In [20], line 2
      1 ###### Delete the position tables if they were incorrect.
----> 2 (sgp.v1.TrodesPosV1()&{'nwb_file_name':nwb_copy_file_name}).delete()

File ~/code/spyglass/src/spyglass/utils/dj_mixin.py:649, in SpyglassMixin.delete(self, force_permission, *args, **kwargs)
    647 def delete(self, force_permission=False, *args, **kwargs):
    648     """Alias for cautious_delete, overwrites datajoint.table.Table.delete"""
--> 649     self.cautious_delete(force_permission=force_permission, *args, **kwargs)

File ~/code/spyglass/src/spyglass/utils/dj_mixin.py:610, in SpyglassMixin.cautious_delete(self, force_permission, *args, **kwargs)
    607 start = time()
    609 if not force_permission:
--> 610     self._check_delete_permission()
    612 merge_deletes = self.delete_downstream_merge(
    613     dry_run=True,
    614     disable_warning=True,
    615     return_parts=False,
    616 )
    618 safemode = (
    619     dj.config.get("safemode", True)
    620     if kwargs.get("safemode") is None
    621     else kwargs["safemode"]
    622 )

File ~/code/spyglass/src/spyglass/utils/dj_mixin.py:534, in SpyglassMixin._check_delete_permission(self)
    527     logger.warn(  # Permit delete if no session connection
    528         "Could not find lab team associated with "
    529         + f"{self.__class__.__name__}."
    530         + "\nBe careful not to delete others' data."
    531     )
    532     return
--> 534 sess_summary = self._get_exp_summary()
    535 experimenters = sess_summary.fetch(self._member_pk)
    536 if None in experimenters:

File ~/code/spyglass/src/spyglass/utils/dj_mixin.py:479, in SpyglassMixin._get_exp_summary(self)
    476 format = dj.U(self._session_pk, self._member_pk)
    478 restr = self.restriction or True
--> 479 sess_link = self._session_connection.join(restr, reverse_order=True)
    481 exp_missing = format & (sess_link - SesExp).proj(**empty_pk)
    482 exp_present = format & (sess_link * SesExp - exp_missing).proj()

AttributeError: 'TableChain' object has no attribute 'join'

[CBroz1]

My mistake! This is a holdover from the old version of TableChain, which uses cascade now. I'll fix shortly