Timeout when displaying a corpus in the Django admin due to millions of SQL queries

Sentry Issue: ARKINDEX-BACKEND-EF

KeyError: 'type'
  File "django/db/models/fields/related_descriptors.py", line 173, in __get__
    rel_obj = self.field.get_cached_value(instance)
  File "django/db/models/fields/mixins.py", line 15, in get_cached_value
    return instance._state.fields_cache[cache_name]

SystemExit: 1
(78 additional frame(s) were not displayed)
...
  File "django/db/models/query.py", line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
  File "django/db/models/sql/compiler.py", line 1156, in execute_sql
    cursor.execute(sql, params)
  File "contextlib.py", line 239, in helper
    return _GeneratorContextManager(func, args, kwds)
  File "contextlib.py", line 85, in __init__
    doc = getattr(func, "__doc__", None)
  File "gunicorn/workers/base.py", line 203, in handle_abort
    sys.exit(1)

It seems that a query is made to get the corpus, then the repository, then the element types, then every single element from all corpora, then one query for each element type of each element, resulting in millions of queries.