Avoid rounding near-perfect compare pass rates to 100%.

With a few fails among tens of thousands of rows, 1-decimal rounding hid residual failures; keep extra precision so the UI never shows 100% when fails remain.

Co-authored-by: Cursor <cursoragent@cursor.com>

netx_api/biz_state/compare_service.py

@@ -204,6 +204,27 @@ def normalize_store_unchanged(raw: Any) -> str:
     return m if m in _STORE_UNCHANGED_MODES else "auto"
 
 
+def compute_pass_rate(*, success: int, fail: int, empty_as: float = 100.0) -> float:
+    """Pass rate for cutover UI.
+
+    With million-row sheets, 3 fails / 50k can round to 100.0% at 1 decimal —
+    never report 100 when any fail remains; add decimals until it stays < 100.
+    """
+    s = max(0, int(success or 0))
+    f = max(0, int(fail or 0))
+    judged = s + f
+    if judged <= 0:
+        return float(empty_as)
+    rate = (s / judged) * 100.0
+    if f <= 0:
+        return round(rate, 1)
+    for nd in (1, 2, 3, 4):
+        r = round(rate, nd)
+        if r < 100.0:
+            return r
+    return 99.9999
+
+
 def resolve_unchanged_policy(
     mode: str, *, before_n: int, after_n: int
 ) -> dict[str, Any]:
@@ -2885,7 +2906,9 @@ def _enrich_summary(summary: dict[str, Any], sheets: list[dict[str, Any]]) -> di
     matched = changed + unchanged
     diff_count = fail_count
     pass_rate = (
-        round((success_count / judged) * 100, 1) if judged else (100.0 if total == 0 else 0.0)
+        compute_pass_rate(success=success_count, fail=fail_count, empty_as=100.0 if total == 0 else 0.0)
+        if judged
+        else (100.0 if total == 0 else 0.0)
     )
     diff_rate = round((fail_count / judged) * 100, 1) if judged else 0.0
 
@@ -2920,7 +2943,11 @@ def _enrich_summary(summary: dict[str, Any], sheets: list[dict[str, Any]]) -> di
                 # Pending sheets must not look like "100% pass"
                 "pass_rate": None
                 if pending
-                else (round((su / sj) * 100, 1) if sj else (100.0 if st == 0 else 0.0)),
+                else (
+                    compute_pass_rate(success=su, fail=sf, empty_as=100.0 if st == 0 else 0.0)
+                    if sj
+                    else (100.0 if st == 0 else 0.0)
+                ),
             }
         )
 

web/src/pages/network/BizComparePage.tsx

@@ -1376,7 +1376,22 @@ export function BizComparePage({ pageMode = "all" }: { pageMode?: BizComparePage
     const fail = sheetFailOf(c);
     const ok = sheetSuccessOf(c);
     const judged = fail + ok;
-    return judged ? Math.round((ok / judged) * 1000) / 10 : 100;
+    if (!judged) return 100;
+    const rate = (ok / judged) * 100;
+    if (fail <= 0) return Math.round(rate * 10) / 10;
+    // 3 fails / 50k ≈ 99.994% — 1-decimal round becomes 100%; keep digits until < 100
+    for (const nd of [1, 2, 3, 4]) {
+      const r = Math.round(rate * 10 ** nd) / 10 ** nd;
+      if (r < 100) return r;
+    }
+    return 99.9999;
+  };
+
+  const formatPassRate = (rate: number | null | undefined) => {
+    if (rate === null || rate === undefined || Number.isNaN(rate)) return "…";
+    // Trim trailing zeros but keep enough precision for near-100 rates
+    const s = Number(rate).toFixed(4).replace(/\.?0+$/, "");
+    return `${s}%`;
   };
 
   const summary = runDetail?.summary || {};
@@ -3591,7 +3606,15 @@ export function BizComparePage({ pageMode = "all" }: { pageMode?: BizComparePage
                                 pass_rate: pending
                                   ? null
                                   : judged
-                                    ? Math.round((unchanged / judged) * 1000) / 10
+                                    ? (() => {
+                                        const rate = (unchanged / judged) * 100;
+                                        if (fail <= 0) return Math.round(rate * 10) / 10;
+                                        for (const nd of [1, 2, 3, 4]) {
+                                          const r = Math.round(rate * 10 ** nd) / 10 ** nd;
+                                          if (r < 100) return r;
+                                        }
+                                        return 99.9999;
+                                      })()
                                     : 100,
                               };
                             })
@@ -3641,7 +3664,7 @@ export function BizComparePage({ pageMode = "all" }: { pageMode?: BizComparePage
                             title={
                               pending
                                 ? `${label} · ${t("bizCompare.sheetPending")}`
-                                : `${label} · ${t("bizCompare.kindFail")} ${fail} · ${t("bizCompare.kindSuccess")} ${ok} · ${t("bizCompare.passRateShort")} ${rate ?? "…"}%`
+                                : `${label} · ${t("bizCompare.kindFail")} ${fail} · ${t("bizCompare.kindSuccess")} ${ok} · ${t("bizCompare.passRateShort")} ${formatPassRate(rate)}`
                             }
                           >
                             <span className="bs-cmp-nav__dot" aria-hidden />
@@ -3658,7 +3681,7 @@ export function BizComparePage({ pageMode = "all" }: { pageMode?: BizComparePage
                                 {pending ? "—" : ok}
                               </span>
                               <span className="bs-cmp-nav__num bs-cmp-nav__num--rate">
-                                {pending || rate === null ? "…" : `${rate}%`}
+                                {pending || rate === null ? "…" : formatPassRate(rate)}
                               </span>
                             </span>
                           </button>
@@ -3714,7 +3737,7 @@ export function BizComparePage({ pageMode = "all" }: { pageMode?: BizComparePage
                         <span className="bs-cmp-strip__pass-value">
                           {activeSheetPending || activePassRate === null
                             ? "…"
-                            : `${activePassRate}%`}
+                            : formatPassRate(activePassRate)}
                         </span>
                       </div>
                       <div className="bs-cmp-strip__kinds" role="group">