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`usage_for_notes` is named for notes and works on every note row, yet the chip reached snippets and rules only. Notes had it nowhere. Lessons had it collected and shown nowhere a person could reach, because #4196 taught `/api/lessons` to attach it and `KnowledgeView` — the only lesson list in the UI — browses through `/api/knowledge`, so `listLessons` still has no consumer. The cause was not a missing line. SEVEN call sites carried their own copy of the same few lines: two REST lists, two REST details, two MCP lists, one MCP detail. Each read perfectly well alone, so "which doors attach usage?" had no answer anywhere in the code — the same asymmetry test_system_tagging_door_parity.py records for System tagging (#4249), where whichever door nobody exercised for a kind is the one that never grew the feature. `attach_usage(rows, key="id")` is now that answer, and all seven go through it. A detail payload is a one-row list, so the single-record doors share the seam rather than keeping a second shape beside it. Deliberately NO try/except: the fail-open already lives in `usage_for_notes`, which reports through `_report_failure("readout")` and returns the zero-filled map. Wrapping it again would swallow the REPORT as well as the error, and a silently-swallowed readout failure is exactly #2663 — every counter reading zero in production for weeks while the writes landed fine. `/api/knowledge` now attaches usage, which closes both holes at once: it is how notes, lessons and processes are all browsed. `KnowledgeView` renders the badge on the card footer, looking the advice up per row because the feed is mixed. The advice moves to utils/deadWeight.ts. Canon #3460 says each caller owns its own const, and that held while each caller showed ONE kind; a mixed feed would need five of its own and the next surface another five. The canon's actual invariant — advice is kind-specific and never baked into the badge — is kept: it is still a prop. The three existing callers now read the same table, so the sentence has one home rather than four. Recorded against #3460 so the next reader is not left re-litigating it. `_row_id` rejects bools explicitly: `int(True)` is 1, so a row carrying a flag under the key would be credited with note #1's counts, and a wrong chip is worse than no chip because it reads as a measurement. A row with no usable id is skipped rather than failing the page. Tests pin the PROPERTY, not one route: no door calls the aggregate directly (AST, so a comment naming it is not a false positive), and every door that shows usage reaches the seam. Plus the N+1 guard — one aggregate per page, asserted on await_count, because the per-row version reads more naturally and is invisible in review. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy