tidaldb/.sdlc/features/pg1-personalization-correctness/audit.md

Security Audit: Personalization Correctness Verification

Scope

Audited tidal/tests/pg1_personalization_correctness.rs — a pure integration test file. No production code changes.

Verdict: PASS

This feature adds only test code. There are no security implications.

Findings

Attack Surface

None. This feature:

• Adds no new public API endpoints
• Modifies no production code paths
• Introduces no new dependencies
• Does not handle user input, network data, or file I/O beyond ephemeral test databases
• Does not introduce any unsafe code

Data Safety

• All tests use TidalDb::builder().ephemeral() — no persistent data is created or modified
• No secrets, credentials, or PII are present in test data
• Entity IDs and user IDs are synthetic test constants

Dependency Review

No new crate dependencies were added. The test file uses only existing tidaldb public API types.

Numerical Safety

• Decay score computations use f64 arithmetic with documented tolerance bounds (1e-6)
• The analytical_decay_score helper uses saturating_sub to prevent underflow on timestamp differences
• relative_error handles the zero-denominator case explicitly
• The no_nan_or_infinity_in_scores test guards against IEEE 754 special values across 6 profiles with edge-case signal weights (1e15, 1e-15, zero)

Checklist

Check	Status
No new unsafe code	PASS
No new dependencies	PASS
No secrets or PII	PASS
No file system side effects	PASS (ephemeral DBs only)
No network access	PASS
No privilege escalation paths	PASS