Getting DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread with DRF and Postgres backend

[sumitj-supr]

Hi, observing this error after a recent deployment. It was working fine until today and it started happening randomly after recent deployment.
Description of the error:
DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread. The object with alias 'default' was created in thread id 140024734693120 and this is thread id 140024743085824.
Searching on Google shows that there's some bad configuration with Celery, but we're not even using Celery in our case.

Adding some important modules we're using:

djangorestframework==3.9.4   
Django==2.2
psycopg2==2.8
requests==2.23.0
sentry-sdk==0.9.5
datadog==0.39.0
ddtrace==0.35.0

After doing the deployment again (With no code changes, just a dummy deployment) this error didn't happen again.

Attaching the stacktrace:

Traceback (most recent call last):
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/views.py", line 483, in dispatch
    self.initial(request, *args, **kwargs)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/sentry_sdk/integrations/django/__init__.py", line 255, in sentry_patched_drf_initial
    return old_drf_initial(self, request, *args, **kwargs)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/views.py", line 400, in initial
    self.perform_authentication(request)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/views.py", line 326, in perform_authentication
    request.user
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/request.py", line 223, in user
    self._authenticate()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/request.py", line 376, in _authenticate
    user_auth_tuple = authenticator.authenticate(self)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/authentication.py", line 192, in authenticate
    return self.authenticate_credentials(token)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/rest_framework/authentication.py", line 197, in authenticate_credentials
    token = model.objects.select_related('user').get(key=key)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/models/query.py", line 402, in get
    num = len(clone)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/models/query.py", line 256, in __len__
    self._fetch_all()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/models/query.py", line 1242, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/models/query.py", line 55, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1095, in execute_sql
    cursor = self.connection.cursor()
  File "/opt/python/run/venv/local/lib64/python3.6/site-packages/ddtrace/contrib/django/patch.py", line 77, in wrapper
    return func(mod, pin, wrapped, instance, args, kwargs)
  File "/opt/python/run/venv/local/lib64/python3.6/site-packages/ddtrace/contrib/django/patch.py", line 96, in cursor
    return dbapi.TracedCursor(func(*args, **kwargs), pin)
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 256, in cursor
    return self._cursor()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 235, in _cursor
    return self._prepare_cursor(self.create_cursor(name))
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 225, in _prepare_cursor
    self.validate_thread_sharing()
  File "/opt/python/run/venv/local/lib/python3.6/site-packages/django/db/backends/base/base.py", line 547, in validate_thread_sharing
    % (self.alias, self._thread_ident, _thread.get_ident())
django.db.utils.DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread. The object with alias 'default' was created in thread id 140024734693120 and this is thread id 140024743085824.