58 lines
2.9 KiB
Markdown
58 lines
2.9 KiB
Markdown
# Baseline Comparison Study — Audit
|
|
|
|
## Security & Privacy
|
|
|
|
| Check | Status | Notes |
|
|
|-------|--------|-------|
|
|
| No PII in experiment data | PASS | Only user_id (opaque u64) used for assignment and aggregation |
|
|
| No external network calls | PASS | All computation is local, read-only over in-memory indexes |
|
|
| No new storage writes | PASS | Experiment module is purely read-only; no WAL entries, no fjall writes |
|
|
| Config validation | PASS | All three TidalDb methods validate config before processing |
|
|
| No secrets or credentials | PASS | No API keys, tokens, or auth material involved |
|
|
|
|
## Correctness & Safety
|
|
|
|
| Check | Status | Notes |
|
|
|-------|--------|-------|
|
|
| No panics on edge cases | PASS | Zero views yields 0.0 rates; zero control yields defined lift values |
|
|
| No integer overflow | PASS | Signal counts are u64; views/clicks/completions summed as u64 |
|
|
| No floating-point NaN | PASS | All division guarded by zero-check; `relative_lift` handles all zero-denominator cases |
|
|
| Deterministic assignment | PASS | FNV-1a hash is platform-independent (fixed constants, explicit byte ordering) |
|
|
| No unsafe code | PASS | No `unsafe` blocks in any experiment code |
|
|
| No unwrap in library code | PASS | All `unwrap()` confined to `#[cfg(test)]` blocks and integration tests |
|
|
|
|
## Performance
|
|
|
|
| Check | Status | Notes |
|
|
|-------|--------|-------|
|
|
| No hot-path impact | PASS | Experiment code is invoked on-demand, not in signal write or retrieve paths |
|
|
| Signal type resolution | PASS | Type IDs resolved once per report, not per user |
|
|
| Allocation profile | PASS | Two Vec allocations (treatment/control user lists) per report; no per-user allocations |
|
|
| O(n*m) scan acknowledged | INFO | `user_signal_count` scans full DashMap per user; acceptable for PG1 pilot scale (<1000 users) |
|
|
|
|
## API Surface
|
|
|
|
| Check | Status | Notes |
|
|
|-------|--------|-------|
|
|
| Public types re-exported | PASS | ExperimentConfig, ExperimentGroup, ExperimentReport, GroupMetrics, MetricLift all accessible from `tidaldb::` |
|
|
| No breaking changes | PASS | All additions are new types/methods; no existing API modified |
|
|
| Doc comments complete | PASS | All public types, methods, and error conditions documented |
|
|
| Error types consistent | PASS | Uses existing TidalError::InvalidInput and TidalError::Internal |
|
|
|
|
## Test Coverage
|
|
|
|
| Area | Unit Tests | Integration Tests |
|
|
|------|-----------|------------------|
|
|
| Assignment determinism | 1 | 1 |
|
|
| Balanced split | 2 (50/50, 10/90) | 1 (50/50) |
|
|
| Config validation | 6 | 0 |
|
|
| Lift math | 4 | 1 |
|
|
| Profile routing | 0 | 1 |
|
|
| Report aggregation | 0 | 2 |
|
|
| Chronological profile | 1 | 2 |
|
|
| **Total** | **16** | **7** |
|
|
|
|
## Verdict
|
|
|
|
**APPROVED.** No security, correctness, or performance concerns. The implementation is read-only, adds no overhead to existing hot paths, and has thorough test coverage across both unit and integration tests. The O(n*m) scan in `user_signal_count` is documented and acceptable for pilot scale.
|