Connection with the DB may break at the end of URLs check

[marfox]

Offending command:

python -m soweego -l soweego DEBUG importer check_urls musicbrainz

Stack trace:

2021-08-16 08:32:54,436 [ERROR] base._finalize_fairy #702 - Exception during reset or similar
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/pymysql/connections.py", line 713, in _write_bytes
    self._sock.sendall(data)
BrokenPipeError: [Errno 32] Broken pipe

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 693, in _finalize_fairy
    fairy._reset(pool)
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/pool/base.py", line 880, in _reset
    pool._dialect.do_rollback(self)
  File "/usr/local/lib/python3.7/site-packages/sqlalchemy/dialects/mysql/base.py", line 2318, in do_rollback
    dbapi_connection.rollback()
  File "/usr/local/lib/python3.7/site-packages/pymysql/connections.py", line 429, in rollback
    self._execute_command(COMMAND.COM_QUERY, "ROLLBACK")
  File "/usr/local/lib/python3.7/site-packages/pymysql/connections.py", line 771, in _execute_command
    self._write_bytes(packet)
  File "/usr/local/lib/python3.7/site-packages/pymysql/connections.py", line 718, in _write_bytes
    "MySQL server has gone away (%r)" % (e,))
pymysql.err.OperationalError: (2006, "MySQL server has gone away (BrokenPipeError(32, 'Broken pipe'))")