psycopg2.errors.DuplicateTable: relation "health_check_db_testmodel" already exists

[glennmatthews]

Environment

• Python version: 3.9
• Nautobot version: 1.1.3-beta.1 (9f52e6e)

Steps to Reproduce

1. Run an earlier version of Nautobot 1.1.x
2. Upgrade to 9f52e6e
3. Run nautobot-server migrate or nautobot-server post_upgrade

Expected Behavior

Server continues functioning

Observed Behavior

Performing database migrations...
Operations to perform:
  Apply all migrations: admin, auth, circuits, contenttypes, dcim, dummy_plugin, extras, ipam, sessions, social_django, taggit, tenancy, users, virtualization
Running migrations:
  Applying extras.0012_healthchecktestmodel...Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 82, in _execute
    return self.cursor.execute(sql)
psycopg2.errors.DuplicateTable: relation "health_check_db_testmodel" already exists


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

Traceback (most recent call last):
  File "/usr/local/bin/nautobot-server", line 5, in <module>
    main()
  File "/source/nautobot/core/cli.py", line 55, in main
    run_app(
  File "/source/nautobot/core/runner/runner.py", line 266, in run_app
    management.execute_from_command_line([runner_name, command] + command_args)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/source/nautobot/core/management/commands/post_upgrade.py", line 78, in handle
    call_command(
  File "/usr/local/lib/python3.9/site-packages/django/core/management/__init__.py", line 168, in call_command
    return command.execute(*args, **defaults)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/base.py", line 85, in wrapped
    res = handle_func(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/django/core/management/commands/migrate.py", line 243, in handle
    post_migrate_state = executor.migrate(
  File "/usr/local/lib/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 "/usr/local/lib/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 "/usr/local/lib/python3.9/site-packages/django/db/migrations/executor.py", line 227, in apply_migration
    state = migration.apply(state, schema_editor)
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/migration.py", line 124, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
  File "/usr/local/lib/python3.9/site-packages/django/db/migrations/operations/models.py", line 92, in database_forwards
    schema_editor.create_model(model)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 324, in create_model
    self.execute(sql, params or None)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/base/schema.py", line 142, in execute
    cursor.execute(sql, params)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 98, in execute
    return super().execute(sql, params)
  File "/usr/local/lib/python3.9/site-packages/cacheops/transaction.py", line 93, in execute
    result = self._no_monkey.execute(self, sql, params)
  File "/usr/local/lib/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 "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/usr/local/lib/python3.9/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/usr/local/lib/python3.9/site-packages/django/db/backends/utils.py", line 82, in _execute
    return self.cursor.execute(sql)
django.db.utils.ProgrammingError: relation "health_check_db_testmodel" already exists

This appears likely to be a result of #819.

[FloLaco]

I have the same issue.
The PR #840 fix the issue for me