Gracefully tag already tagged batches

[wetneb]

[2024-05-22 08:19:23,096: ERROR/ForkPoolWorker-6] Task inspect_batches[cea9c6df-9e1b-4c58-8843-a1e05e29ff1b] raised unexpected: IntegrityError(1062, "Duplicate entry 'prop-P1545-1967099' for key 'tagging_tag_batches_tag_id_batch_id_3fdf11f1_uniq'")
Traceback (most recent call last):
  File "/data/project/editgroups/www/python/venv/lib/python3.11/site-packages/django/db/backends/utils.py", line 105, in _execute
    return self.cursor.execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/project/editgroups/www/python/venv/lib/python3.11/site-packages/django/db/backends/mysql/base.py", line 76, in execute
    return self.cursor.execute(query, args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/project/editgroups/www/python/venv/lib/python3.11/site-packages/mysqlclient-2.2.1-py3.11-linux-x86_64.egg/MySQLdb/cursors.py", line 179, in execute
    res = self._query(mogrified_query)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/project/editgroups/www/python/venv/lib/python3.11/site-packages/mysqlclient-2.2.1-py3.11-linux-x86_64.egg/MySQLdb/cursors.py", line 330, in _query
    db.query(q)
  File "/data/project/editgroups/www/python/venv/lib/python3.11/site-packages/mysqlclient-2.2.1-py3.11-linux-x86_64.egg/MySQLdb/connections.py", line 257, in query
    _mysql.connection.query(self, query)
MySQLdb.IntegrityError: (1062, "Duplicate entry 'prop-P1545-1967099' for key 'tagging_tag_batches_tag_id_batch_id_3fdf11f1_uniq'")