Flaky test: tests/sentry/services/eventstore/test_models.py::EventTest::test_snuba_data

Failing test: `tests/sentry/services/eventstore/test_models.py::EventTest::test_snuba_data`
Sentry sha: 2597189bd40bd108bd7ec710a885fc0cc3e38548
Run: https://github.com/getsentry/sentry/actions/runs/22282680173

```
tests/sentry/services/eventstore/test_models.py:255: in test_snuba_data
assert event_from_nodestore.timestamp == event_from_snuba.timestamp
E AssertionError: assert '2026-02-22T18:26:34+00:00' == '2026-02-22T1....099000+00:00'
E 
E - 2026-02-22T18:27:34.099000+00:00
E ? ^ -------
E + 2026-02-22T18:26:34+00:00
E ? ^
```

Start with tests/sentry/services/eventstore/test_models.py::EventTest::test_snuba_data and reproduce the failure using the linked GitHub Actions run or the recorded Sentry SHA. Investigate why the nodestore and Snuba event timestamps differ in both seconds and microseconds. Done means the test passes reliably and preserves the intended timestamp comparison.

Written by the indexing model from the issue text.