Migration issue with supabase db diff for partition tables

[HimaniShah1]

Describe the bug
supabase db diff command gives an error when creating a migration on db that contains partition table. A new partition table is generated every month and for incremental migrations, it is creating an issue.

To Reproduce
Steps to reproduce the behavior:

1. Create a db with partition table
2. dump it and create the first migration
3. create another table in that partition table
4. run supabase db diff (to create a new migration)

Expected behavior
A new migration file with the updated changes should be created.

System information

• Version of CLI: Tried with both v1.226.4 and v2.0.0
• Version of Docker: v27.3.1

Error Log
error diffing schema: error running container: exit 1:
Traceback (most recent call last):
File "/usr/local/bin/migra", line 8, in
sys.exit(do_command())
File "/usr/local/lib/python3.9/site-packages/migra/command.py", line 121, in do_command
status = run(args)
File "/usr/local/lib/python3.9/site-packages/migra/command.py", line 98, in run
m.add_all_changes(privileges=args.with_privileges)
File "/usr/local/lib/python3.9/site-packages/migra/migra.py", line 107, in add_all_changes
self.add(self.changes.tables_only_selectables())
File "/usr/local/lib/python3.9/site-packages/migra/changes.py", line 496, in get_selectable_changes
statements += get_table_changes(
File "/usr/local/lib/python3.9/site-packages/migra/changes.py", line 233, in get_table_changes
rls_alter = v.alter_rls_statement
File "/usr/local/lib/python3.9/site-packages/schemainspect/pg/obj.py", line 228, in alter_rls_statement
return self.alter_table_statement(self.alter_rls_clause)
File "/usr/local/lib/python3.9/site-packages/schemainspect/pg/obj.py", line 145, in alter_table_statement
raise NotImplementedError # pragma: no cover
NotImplementedError

Additional context
Seems like migra tool is creating an issue on policies. But happening only with partition table. It works fine if the tables are not partitioned.

[HimaniShah1]

@sweatybridge Could you please help me with this issue?