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f236ef2e31
## Description
Fixes the failing Rust test on `main` after #2669 made SQLite CCR
entries valid at the exact TTL boundary. The integration test waited
only 3.3 seconds for a three-second ceiling; unix-second truncation can
represent that as exactly three seconds, so the entry is correctly still
valid. The test now crosses a guaranteed four-second elapsed boundary.
## Type of Change
- [x] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [ ] Performance improvement
- [ ] Code refactoring (no functional changes)
## Changes Made
- Extend the max-lifetime test's access loop from four to five 700 ms
gaps.
- Document why four gaps can land on the valid equality boundary and why
five are deterministic.
- Leave production SQLite TTL behavior and defaults unchanged.
## Testing
- [x] Unit tests pass (`cargo test -p headroom-core --test
ccr_backends`)
- [x] Formatting passes (`cargo fmt --all -- --check`)
- [ ] Type checking passes (`mypy headroom`)
- [ ] New tests added for new functionality
- [x] Manual testing performed
### Test Output
```text
cargo test -p headroom-core --test ccr_backends
test result: ok. 12 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
5 consecutive repetitions of the previously failing test:
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 11 filtered out
```
## Real Behavior Proof
- Environment: macOS, Rust workspace at
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| benches | ||
| config | ||
| proptest-regressions/transforms | ||
| src | ||
| tests | ||
| Cargo.toml | ||