Flaky test: tests/sentry/issues/escalating/test_escalating.py::HistoricGroupCounts::test_query_single_group

Failing test: `tests/sentry/issues/escalating/test_escalating.py::HistoricGroupCounts::test_query_single_group`
Sentry sha: 94eda9b7a769c0e3366416f4aaa3606d9428cb1d
Run: https://github.com/getsentry/sentry/actions/runs/22291133157

```
tests/sentry/issues/escalating/test_escalating.py:103: in test_query_single_group
assert query_groups_past_counts(Group.objects.all()) == [
E AssertionError: assert [] == [{'count()': ...681061789696}]
E 
E Right contains one more item: {'count()': 1, 'group_id': 456, 'hourBucket': '2026-02-23T03:00:00+00:00', 'project_id': 4557681061789696}
E 
E Full diff:
E + []
E - [
E - {
E - 'count()': 1,
E - 'group_id': 456,
E - 'hourBucket': '2026-02-23T03:00:00+00:00',
E - 'project_id': 4557681061789696,
E - },
E - ]
```

Start with tests/sentry/issues/escalating/test_escalating.py::HistoricGroupCounts::test_query_single_group and reproduce the failure using the linked GitHub Actions run as context. Trace why query_groups_past_counts(Group.objects.all()) returns an empty list instead of the expected group count. Done means the test passes reliably without masking the underlying failure.

Written by the indexing model from the issue text.