fix(storage): group mcp_metrics error_reasons by code only#542
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NagyVikt merged 1 commit intoMay 14, 2026
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Handlers embed session IDs in error messages (e.g. "sub-task is claimed by codex-session-X"), which fragmented identical errors into many distinct (code, message) groups and pushed most past the 3-row truncation. On live data `task_plan_claim_subtask` showed 7 of 93 errors in `Top error reasons` while the Operations table showed 93. Drop `error_message` from the grouping key (SQLite's bare-column-with-MAX(ts) picks the latest sample message), bump the per-op cap 3 -> 8, and add a regression test that pins sum_of_reasons == error_count for 25 unique-message races + 2 not-found errors. After the fix the same op reports 60 + 33 + 1 = 94 across three codes, matching error_count exactly.
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