--- scripts/benchmark-native-controller-recovery.ts
+++ scripts/benchmark-native-controller-recovery.ts
@@ -0,0 +1 @@
+// Temporary qualification probe derived from frozen benchmark SHA256 abaa29d50eb95013836b54b8dacc94c72e080edf24744cc5d291cc5eb1ff2818.
@@ -14 +15 @@
-const repoRoot = fileURLToPath(new URL("../", import.meta.url));
+const repoRoot = path.resolve(required("BENCH_CANDIDATE_ROOT"));
@@ -187 +188 @@
-    const byPool = Object.fromEntries(["benchmark-application", "paperclip-controller-lease", "paperclip-runner-checkpoint"].map(pool => {
+    const byPool = Object.fromEntries(["benchmark-application", "benchmark-replacement-application", "paperclip-controller-lease", "paperclip-runner-checkpoint"].map(pool => {
@@ -250,0 +252 @@
+  const replacementDb = createDb(u, { maxConnections: 10, applicationName: "benchmark-replacement-application" });
@@ -256,0 +259 @@
+  const replacementOwner = { ...owner, bootId: randomUUID() };
@@ -299,0 +303,3 @@
+    ["replacement_request", replacementDb.$client],
+    ["replacement_liveness", livenessDb(replacementDb).$client],
+    ["replacement_checkpoint", checkpointDb(replacementDb).$client],
@@ -369,0 +376 @@
+  replacementDb.$client.options.debug = db.$client.options.debug;
@@ -386,0 +394,2 @@
+  livenessDb(replacementDb).$client.options.debug = livenessDb(db).$client.options.debug;
+  checkpointDb(replacementDb).$client.options.debug = checkpointDb(db).$client.options.debug;
@@ -389,0 +399,2 @@
+    const controllerDb = i % 2 ? replacementDb : db;
+    const controllerOwner = i % 2 ? replacementOwner : owner;
@@ -443,3 +454,3 @@
-        controllerBootId: owner.bootId,
-        controllerPid: owner.pid,
-        controllerProcessStartedAt: owner.processStartedAt,
+        controllerBootId: controllerOwner.bootId,
+        controllerPid: controllerOwner.pid,
+        controllerProcessStartedAt: controllerOwner.processStartedAt,
@@ -467 +478 @@
-      const writer = (variant === "candidate" ? CandidateWriter : BaselineWriter)(db, {
+      const writer = (variant === "candidate" ? CandidateWriter : BaselineWriter)(controllerDb, {
@@ -472 +483 @@
-        bootId: owner.bootId,
+        bootId: controllerOwner.bootId,
@@ -511 +522 @@
-      db,
+      controllerDb,
@@ -531 +542 @@
-                bootId: owner.bootId,
+                bootId: controllerOwner.bootId,
@@ -544,0 +556,2 @@
+      db: controllerDb,
+      owner: controllerOwner,
@@ -592 +605 @@
-  for (let i = 0; i < 100; i++) await loadAgentRunAuthentication(db, items[i % n]);
+  for (let i = 0; i < 100; i++) await loadAgentRunAuthentication(items[i % n].db, items[i % n]);
@@ -639 +652 @@
-    const input = { db, ...item, attempt: 1, controller: owner };
+    const input = { ...item, attempt: 1, controller: item.owner };
@@ -664 +677 @@
-              const rows = await loadAgentRunAuthentication(db, item);
+              const rows = await loadAgentRunAuthentication(item.db, item);
@@ -700 +713 @@
-            await db.update(issues).set({ updatedAt: new Date() }).where(eq(issues.id, item.issueId));
+            await item.db.update(issues).set({ updatedAt: new Date() }).where(eq(issues.id, item.issueId));
@@ -713 +726 @@
-            await db.transaction(async (tx: any) => {
+            await (metrics.admissionsOffered % 2 ? replacementDb : db).transaction(async (tx: any) => {
@@ -917,6 +930 @@
-    const profile = [
-      ["baseline", 300],
-      ["candidate", 300],
-      ["candidate", 300],
-      ["baseline", 300],
-    ] as const;
+    const profile = [["baseline", 300], ["candidate", 300], ["candidate", 300], ["baseline", 300]] as const;
@@ -929 +937 @@
-        "Paired baseline/candidate, including real PaperclipControlPlanePort snapshot persistence on every control checkpoint. Database/control-plane component stress; real production checkpoint writer and natural remote lease timers. Same synthetic DB request load. Not full HTTP, harness or hosted capacity qualification.",
+        "Two logical servers in one client process, 150 controllers each, separate request/liveness/checkpoint pools at unchanged caps; same aggregate aligned-burst workload. Matched baseline/candidate ABBA pool-overlap component qualification; no takeover latency or provider reattachment claim. Includes real PaperclipControlPlanePort snapshot persistence on every control checkpoint. Database/control-plane component stress; real production checkpoint writer and natural remote lease timers. Same synthetic DB request load. Not full HTTP, harness or hosted capacity qualification.",
@@ -930,0 +939 @@
+        logicalServers: 2,