upgrade 4.1.0 to 4.2.0 cause access to wrong table

I am using silk on a system which does not managed the table, its migration model like this

migrations.CreateModel(
            name='User',
            fields=[
                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
                ('password', models.CharField(max_length=128, verbose_name='password')),
                ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
                ('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
                ('username', models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username')),
                ('first_name', models.CharField(blank=True, max_length=150, verbose_name='first name')),
                ('last_name', models.CharField(blank=True, max_length=150, verbose_name='last name')),
                ('email', models.EmailField(blank=True, max_length=254, verbose_name='email address')),
                ('is_staff', models.BooleanField(default=False, help_text='Designates whether the user can log into this admin site.', verbose_name='staff status')),
                ('is_active', models.BooleanField(default=True, help_text='Designates whether this user should be treated as active. Unselect this instead of deleting accounts.', verbose_name='active')),
                ('date_joined', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date joined')),
                ('display_name', models.CharField(blank=True, max_length=255, null=True)),
                ('role', models.IntegerField(choices=[(0, 'System'), (1, 'Admin'), (2, 'Operator'), (3, 'CustomerService'), (100, 'Merchant'), (200, 'Platform'), (300, 'Agent'), (1000, 'Player')], default=2)),
                ('google2fa_secret', models.CharField(max_length=100)),
                ('update_time', models.DateTimeField(auto_now=True)),
            ],
            options={
                'db_table': 'backend_user',
                'managed': False,
            },
            managers=[
                ('objects', django.contrib.auth.models.UserManager()),
            ],
        )

it is work fine on 4.1.0, but I encounter below issue on 4.2.0

2021-11-02 23:17:19,237 [WARNING][unicorn_common.middleware:34] - get_jwt_user() UnicornAuthentication failed. message: (1146, "Table 'olympus.backend_user' doesn't exist")
2021-11-02 23:17:19,296 [ERROR][django.request:224] - Internal Server Error: /games/games/
Traceback (most recent call last):
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 73, in execute
    return self.cursor.execute(query, args)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/cursors.py", line 206, in execute
    res = self._query(query)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/cursors.py", line 319, in _query
    db.query(q)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/connections.py", line 259, in query
    _mysql.connection.query(self, query)
MySQLdb._exceptions.ProgrammingError: (1146, "Table 'olympus.backend_user' doesn't exist")

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

Traceback (most recent call last):
  File "/home/venv_olympus/lib/python3.8/site-packages/asgiref/sync.py", line 482, in thread_handler
    raise exc_info[1]
  File "/home/venv_olympus/lib/python3.8/site-packages/django/core/handlers/exception.py", line 38, in inner
    response = await get_response(request)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/core/handlers/base.py", line 231, in _get_response_async
    response = await wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/asgiref/sync.py", line 444, in __call__
    ret = await asyncio.wait_for(future, timeout=None)
  File "/usr/lib/python3.8/asyncio/tasks.py", line 455, in wait_for
    return await fut
  File "/home/venv_olympus/lib/python3.8/site-packages/asgiref/current_thread_executor.py", line 22, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/asgiref/sync.py", line 486, in thread_handler
    return func(*args, **kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/viewsets.py", line 125, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 497, in dispatch
    self.initial(request, *args, **kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 414, in initial
    self.perform_authentication(request)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/views.py", line 324, in perform_authentication
    request.user
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/request.py", line 227, in user
    self._authenticate()
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework/request.py", line 380, in _authenticate
    user_auth_tuple = authenticator.authenticate(self)
  File "/home/venv_olympus/lib/python3.8/site-packages/rest_framework_simplejwt/authentication.py", line 42, in authenticate
    return self.get_user(validated_token), validated_token
  File "/home/venv_olympus/lib/python3.8/site-packages/unicorn_common/authentication.py", line 25, in get_user
    user = auth_model.objects.get(pk=_id)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/models/query.py", line 425, in get
    num = len(clone)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/models/query.py", line 269, in __len__
    self._fetch_all()
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/models/query.py", line 1308, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/models/query.py", line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "/home/venv_olympus/lib/python3.8/site-packages/silk/sql.py", line 94, in execute_sql
    query_dict['analysis'] = _explain_query(q, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/silk/sql.py", line 56, in _explain_query
    cur.execute(prefixed_query, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 98, in execute
    return super().execute(sql, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/django/db/backends/mysql/base.py", line 73, in execute
    return self.cursor.execute(query, args)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/cursors.py", line 206, in execute
    res = self._query(query)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/cursors.py", line 319, in _query
    db.query(q)
  File "/home/venv_olympus/lib/python3.8/site-packages/MySQLdb/connections.py", line 259, in query
    _mysql.connection.query(self, query)
django.db.utils.ProgrammingError: (1146, "Table 'olympus.backend_user' doesn't exist")

it seems something change from 4.1.0 to 4.2.0 at below function

  File "/home/venv_olympus/lib/python3.8/site-packages/silk/sql.py", line 94, in execute_sql
    query_dict['analysis'] = _explain_query(q, params)
  File "/home/venv_olympus/lib/python3.8/site-packages/silk/sql.py", line 56, in _explain_query
    cur.execute(prefixed_query, params)

I am not sure what change cause this issue, but I think it should work the same way like 4.1.0 without error.

[glujan]

@caesarleong @rafou @j-zaballa: Please see if #538 fixes the issue for you.

[j-zaballa]

@glujan thank you so much for the PR. It does indeed solve the issue 😃