Migrations error moving from awx 19.0.1 to 21.0.0

[Buyongo Phiri]

Hello, 

Migrations seem to fail on this one, looks like the db changed. Is there a way to fix it?

(awx) bash-5.1$ awx-manage migrate
Operations to perform:
  Apply all migrations: auth, conf, contenttypes, main, oauth2_provider, sessions, sites, social_django, sso, taggit
Running migrations:
  Applying main.0156_capture_mesh_topology...Traceback (most recent call last):
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
psycopg2.errors.InvalidForeignKey: there is no unique constraint matching given keys for referenced table "main_instance"


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/var/lib/awx/venv/awx/bin/awx-manage", line 8, in <module>
    sys.exit(manage())
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/awx/__init__.py", line 170, in manage
    execute_from_command_line(sys.argv)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/base.py", line 89, in wrapped
    res = handle_func(*args, **kwargs)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/core/management/commands/migrate.py", line 244, in handle
    post_migrate_state = executor.migrate(
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/migrations/executor.py", line 117, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/migrations/executor.py", line 230, in apply_migration
    migration_recorded = True
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/base/schema.py", line 118, in __exit__
    self.execute(sql)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/base/schema.py", line 145, in execute
    cursor.execute(sql, params)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/var/lib/awx/venv/awx/lib64/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: there is no unique constraint matching given keys for referenced table "main_instance"