The site had a downtime today with a lot of DB connection issues similar to the following:

(Background on this error at: https://sqlalche.me/e/20/e3q8)
2024-12-02 07:10:53,266 listenbrainz.webserver ERROR Exception on /1/submit-listens [POST]
Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1969, in _exec_single_context
self.dialect.do_execute(
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/default.py", line 922, in do_execute
cursor.execute(statement, parameters)
psycopg2.OperationalError: server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

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

Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1455, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 869, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 867, in full_dispatch_request
rv = self.dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 852, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/code/listenbrainz/listenbrainz/webserver/decorators.py", line 18, in decorator
resp = make_response(f(*args, **kwargs))
^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/brainzutils/ratelimit.py", line 262, in rate_limited
return f(*args, **kwargs)
^^^^^^^^^^^^^^^^^^
File "/code/listenbrainz/listenbrainz/webserver/views/api.py", line 75, in submit_listen
user = validate_auth_header(fetch_email=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/code/listenbrainz/listenbrainz/webserver/views/api_tools.py", line 486, in validate_auth_header
user = db_user.get_by_token(db_conn, auth_token, fetch_email=fetch_email)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/code/listenbrainz/listenbrainz/db/user.py", line 199, in get_by_token
result = db_conn.execute(sqlalchemy.text("""
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1416, in execute
return meth(
^^^^^
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/sql/elements.py", line 516, in _execute_on_connection
return connection._execute_clauseelement(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1639, in _execute_clauseelement
ret = self._execute_context(
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1848, in _execute_context
return self._exec_single_context(
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1988, in _exec_single_context
self._handle_dbapi_exception(
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 2343, in _handle_dbapi_exception
raise sqlalchemy_exception.with_traceback(exc_info[2]) from e
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1969, in _exec_single_context
self.dialect.do_execute(
File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/default.py", line 922, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.

[SQL:
SELECT id,created,musicbrainz_id,auth_token,last_login,latest_import,gdpr_agreed,musicbrainz_row_id,login_id,email
FROM "user"
WHERE auth_token = %(auth_token)s
]
[parameters:

{'auth_token': 'c5f0300b-b0da-45e6-82e8-8e2641ca54de'}

]