## 1. Implementation

- [x] 1.1 Add test for `add_ephemeral_prefix` static method
- [x] 1.2 Add tests for `_render_limited_alias` method (require_alias=True and False)
- [x] 1.3 Add tests for `_render_event_time_filtered` method (start+end, start-only, end-only, neither)
- [x] 1.4 Add tests for `_render_subquery_alias` method (require_alias=True and False)

## 2. Validation

- [x] 2.1 Run unit tests to verify all pass
- [x] 2.2 Run coverage report to confirm 100% coverage on relation.py
