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The readout already grouped usage by source — `group_by(event, source)` — and the loop directly below it threw the source away, collapsing every surface into one corpus-wide ratio. So the question a threshold is actually tuned against, "is THIS surface worth its noise", could not be asked of any surface, while the data to answer it sat in the table. `usage.by_source` reports notes_surfaced / notes_pulled / pull_through per surface. The grain is the note, not the call: a pull records the door it came through, not the surface that led there, so grouping the pulled rows by source would answer a different question. Joining surfaced rows to pulled rows on note_id answers this one without the session identity #2085 declined to invent — at the cost of being an upper bound per surface, which the docstring says where it is read. Ambient surfaces report counts and a null ratio: nothing chose those records, so "surfaced often, opened never" is not a judgment about them. A surface that genuinely produced nothing reports 0.0, which must not look like the null. The join is guarded separately from the two reads above it. #2663 was a novel SQL shape the database rejected inside a broad except; this is the novel shape here, and it must not take down two readouts that work. Tests are integration for that same reason — a mock passes on a query Postgres refuses. They pin the distinct-first property (three surfacings of one note are one note), the ambient null, and the LIKE escape, since an unescaped `mcp_%` also matches `mcpXget_note` and nothing else in the payload would show the difference.