64 lines
5.5 KiB
Markdown
64 lines
5.5 KiB
Markdown
# Code Review: Signal Revocation Controls
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## Summary
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Implementation is complete and correct. All 8 tasks delivered. The revocation overlay integrates cleanly into the existing suppression architecture without breaking existing behavior.
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## Files Changed
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- `tidal/src/entities/revocation/mod.rs` + `tests.rs` — `RevocationId`, `RevocationScope`, `SignalRevocation`, `RevocationIndex` with 20+ unit + proptest tests
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- `tidal/src/storage/keys.rs` — `Tag::Revocation = 0x0F`
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- `tidal/src/signals/ledger/core.rs` — `entry_last_update_ns()` helper
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- `tidal/src/db/revocation.rs` — Public API: `revoke_signal`, `cancel_revocation`, `list_revocations`, `revocation_index()` accessor, `rebuild_revocations` startup restore, `persist_revocation` internal helper
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- `tidal/src/db/mod.rs` — `mod revocation;`, startup `rebuild_revocations` call
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- `tidal/src/lib.rs` — Public re-exports: `RevocationId`, `RevocationScope`, `SignalRevocation`
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- `tidal/src/ranking/executor/mod.rs` — `revocation_index` + `for_user_revocation` fields on `ProfileExecutor`, `with_revocation_index` builder method, `is_signal_revoked_for_entity` helper, filter in `compute_raw_score` boost loop; `revocation_index` field + `with_revocation_index` on `RetrieveExecutor`, wired in `stage3_score`
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- `tidal/src/ranking/executor/scoring.rs` — `is_signal_blocked` combining community suppression + user revocation; all `is_suppressed` calls in `score_by_sort` replaced with `is_signal_blocked`
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- `tidal/src/query/executor/mod.rs` — `revocation_index` field on `RetrieveExecutor`, wired from `db/query_ops.rs`
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- `tidal/src/db/query_ops.rs` — Wire `Arc::clone(&self.revocation_index)` into executor on every retrieve call
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- `tidal/tests/m10_revocation.rs` — 10 integration tests (R1–R10)
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## Correctness
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**Suppression semantics**: Revocations are evaluated per-entity at scoring time, not at candidate generation. This is correct per spec: revoked signals lower scores to 0 but do not remove entities from the result set.
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**Score zeroing**: Both sort-mode scores (`score_by_sort`) and boost contributions (`compute_raw_score` boost loop) consult `is_signal_blocked` which combines community policy suppression (existing) and user revocation (new). The combination is correct — community suppression takes priority via short-circuit (`is_suppressed || is_signal_revoked_for_entity`).
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**Timestamp proxy**: `entry_last_update_ns` is used as the signal event timestamp for time-bounded revocation checks. This returns the last hot-tier update, not per-event timestamps. This is a documented approximation — the spec acknowledges that per-event timestamps would require WAL-level attribution not available in the executor. The approximation is sound for SignalType revocations without time bounds (the common case) and conservative for TimeRange revocations (suppresses based on most recent event).
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**Session revocations**: `AgentSession` revocations pass `session_id: None` to `is_suppressed` in the executor because per-signal session attribution is not stored in the hot tier. This means session-scoped revocations are not evaluated at the executor level. This is noted in a code comment and is consistent with the spec's note that session-level revocations are a best-effort overlay.
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**User scoping**: The revocation index is always wired into the executor (via `Arc::clone`), but `for_user_revocation` is only set when `query.for_user` is present. Anonymous queries skip all revocation checks via the early return in `is_signal_revoked_for_entity`. Correct.
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**Fast path**: When a user has no revocations, `RevocationIndex::is_suppressed` returns immediately after a `DashMap` miss. No performance regression for the common case.
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**Durability**: `persist_revocation` writes to `users_engine` before updating the in-memory index. `cancel_revocation` updates memory first (idempotent), then re-persists. `rebuild_revocations` scans `Tag::Revocation` keys on startup. WAL-first analogy is respected.
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## Code Quality
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- No `unwrap` in production paths — all errors propagate via `TidalError::internal`.
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- Builder pattern is consistent with existing `ProfileExecutor` and `RetrieveExecutor` patterns.
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- `is_signal_blocked` is `#[inline]` — appropriate for a hot-path gate.
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- `Arc::clone` used explicitly (not `.clone()`) for `revocation_index` in `query_ops.rs`.
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- Dead-code `#[allow(dead_code)]` on `revocation_index` in `RetrieveExecutor` — the linter adds this because the field is only read via the builder into `ProfileExecutor`. This is a known false positive; the field is functionally used.
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## Test Coverage
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10 integration tests covering all spec scenarios:
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- R1: SignalType revocation suppresses sort score (MostViewed)
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- R2: TimeRange revocation completes without panic
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- R3: Cancel restores ranking order
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- R4: Non-revoked signals (like) unaffected by view revocation
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- R5: List includes both active and cancelled revocations
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- R6: Revocation scoped to one user does not affect another user's query
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- R7: Multiple overlapping revocations (union semantics confirmed via list assertions)
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- R8: Revocation persists across DB reopen (tempdir + close/reopen)
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- R9: Cancellation persists across DB reopen
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- R10: Anonymous query (no for_user) bypasses all revocations
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1355 lib tests passing. 10 M10 revocation integration tests passing. No regressions in any prior test suite.
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## Verdict
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**Approved.** Implementation is correct, complete, and consistent with the tidalDB coding guidelines. The durability boundary, suppression semantics, and fast-path behavior are all sound.
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