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Milestone 333 step 1. The write-path standing-rule arm is the only retrieval surface in Scribe whose usefulness cannot be observed — and, not coincidentally, the only one that has never declined to fire. 296 calls, zero zero-result, 100% clearing its threshold, while every other surface declines most of the time (#3311, and re-measured in note #3430). `retrieval_logs` gives it scores; scores say what the ranker thought, never whether the hint landed. WHY A SIBLING TABLE AND NOT A COLUMN ON note_usage_events. The row carries no note-specific field and the readout is the same shape, which is the strongest case for sharing that note #3163 admits. What decides against it is identity at RESTORE: the note importer maps note_id through note_id_map, so a rule id parked in that column comes back attached to whatever note holds that number in the target database. Not dropped — reattached. The restore reports success, the counters are populated, and every one is about the wrong record, with no other field to disagree with. rule_versions made the same call for the same reason; this is the third rule-side sibling and it reads like the first two. FK-free on rule_id and user_id, matching note_usage_events / retrieval_logs / app_logs, and deliberately unlike rule_versions. A version belongs to a rule's history and dies with it; telemetry outlives what it describes. Deleting a rule must not erase the evidence that it was surfaced forty times and opened never, because that evidence is the case for having deleted it. The service uses `background.spawn` rather than a third copy of the strong-reference dance — that module's own docstring says new callers should, and a fourth copy is how one of them drifts. The AppLog canary #2663 demands is kept, and since `rule_usage` needed exactly `note_usage`'s semantics, that canary moved into `background.report_telemetry_failure` and note_usage now calls it. `retrieval_telemetry` deliberately keeps its own: its canary is a different shape (one process-wide flag, no AppLog row), so repointing it would change behaviour rather than consolidate it. No ambient bucket, and that is a decision. The note twin splits ranked from ambient surfacings because enter_project and the skill sync deliver records without choosing them (#2477). Rules have the same problem waiting — list_always_on_rules loads them wholesale — but nothing emits here yet, so an empty AMBIENT_SOURCES would be machinery pretending to a distinction the data does not contain. `source` stays granular, so the split stays a readout-level change needing no migration. Backup carries it (v14). The round-trip test seeds a NOTE alongside the rule so the target database has a note id to collide with — without that decoy, a restore running rule ids through the wrong map would merely drop them and the test would pass by absence, rather than failing on the populated-and-wrong result that is the actual hazard. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TcCs1CcQ1ormdnzSshKqvN