fix(web): stop autosave loop by ignoring volatile server-echo fields

web/app/workflows/[id]/page.tsx

@@ -35,6 +35,17 @@ function AdhocBadge() {
     );
 }
 
+// Stable snapshot of only the fields the editor controls. Excludes volatile
+// server-echo fields (e.g. updated_at) that would otherwise change on every
+// save and cause autosave to loop forever.
+function snapshotOf(w: Workflow): string {
+    return JSON.stringify({
+        name: w.name,
+        target_server_ids: w.target_server_ids,
+        steps: w.steps,
+    });
+}
+
 function timeAgo(date: Date): string {
     const s = Math.floor((Date.now() - date.getTime()) / 1000);
     if (s < 5) return "just now";
@@ -80,7 +91,7 @@ export default function WorkflowBuilder() {
     useEffect(() => {
         if (loaded && !wf) {
             setWf(loaded);
-            savedSnapshotRef.current = JSON.stringify(loaded);
+            savedSnapshotRef.current = snapshotOf(loaded);
         }
         // eslint-disable-next-line react-hooks/exhaustive-deps
     }, [loaded]);
@@ -115,7 +126,7 @@ export default function WorkflowBuilder() {
     // Must stay above the early return below so hook order is stable.
     useEffect(() => {
         if (!wf || savedSnapshotRef.current === null) return;
-        if (JSON.stringify(wf) === savedSnapshotRef.current) return;
+        if (snapshotOf(wf) === savedSnapshotRef.current) return;
         const t = setTimeout(() => {
             save();
         }, 800);
@@ -147,7 +158,7 @@ export default function WorkflowBuilder() {
         if (savingRef.current) return;
         const current = wfRef.current;
         if (!current) return;
-        const snapshot = JSON.stringify(current);
+        const snapshot = snapshotOf(current);
         if (snapshot === savedSnapshotRef.current) return;
         savingRef.current = true;
         setSaving(true);
@@ -158,10 +169,10 @@ export default function WorkflowBuilder() {
                 setError("Save failed: server returned an unexpected response.");
                 return;
             }
-            if (JSON.stringify(wfRef.current) === snapshot) {
+            if (wfRef.current && snapshotOf(wfRef.current) === snapshot) {
                 // Nothing changed while the request was in flight: adopt the
                 // server echo as the new saved baseline.
-                savedSnapshotRef.current = JSON.stringify(updated);
+                savedSnapshotRef.current = snapshotOf(updated);
                 setWf(updated);
             } else {
                 // The user edited again mid-flight. Keep their newer state and
@@ -177,7 +188,7 @@ export default function WorkflowBuilder() {
             setSaving(false);
             // If edits arrived during the save (or a concurrent save was
             // skipped), persist them on the next tick.
-            if (wfRef.current && JSON.stringify(wfRef.current) !== savedSnapshotRef.current) {
+            if (wfRef.current && snapshotOf(wfRef.current) !== savedSnapshotRef.current) {
                 setTimeout(() => save(), 0);
             }
         }
@@ -638,7 +649,7 @@ export default function WorkflowBuilder() {
                 onSaved={(w) => {
                     // The modal already persisted w; sync the snapshot so
                     // autosave doesn't fire a redundant follow-up save.
-                    savedSnapshotRef.current = JSON.stringify(w);
+                    savedSnapshotRef.current = snapshotOf(w);
                     setWf(w);
                 }}
                 onClose={() => setEditWorkflowOpen(false)}