fix(schema-diff): guard deploy script execution

apps/desktop/src/components/diff/SchemaDiffDdlPanel.vue

@@ -465,10 +465,6 @@ function copyDeploySqlAll() {
             <Copy class="w-3 h-3" />
             {{ t("diff.copy") }}
           </Button>
-          <Button variant="ghost" size="sm" class="h-6 px-2 text-xs gap-1" :disabled="canExecute === false" @click="$emit('executeScript')">
-            <Play class="w-3 h-3" />
-            {{ t("diff.execute") }}
-          </Button>
         </div>
       </div>
       <div class="flex-1 overflow-auto p-3">

apps/desktop/src/components/diff/SchemaDiffDialog.vue

@@ -51,6 +51,7 @@ import {
   type CompatibilityWarning,
   type PermissionDiff,
   type DependencyGraph,
+  normalizeSchemaDiffDependencyGraph,
 } from "@/lib/schema/schemaDiff";
 import { compileSchemaDiffTableFilter, filterSchemaDiffTables } from "@/lib/schema/schemaDiffTableFilter";
 import { Splitpanes, Pane } from "splitpanes";
@@ -593,7 +594,7 @@ async function handleCompare() {
     renameCandidates.value = result.renameCandidates ?? [];
     compatibilityWarnings.value = result.compatibilityWarnings ?? [];
     permissionDiffs.value = result.permissionDiffs ?? [];
-    dependencyGraph.value = result.dependencyGraph ?? null;
+    dependencyGraph.value = normalizeSchemaDiffDependencyGraph(result.dependencyGraph);
 
     // Convert to unified objects
     diffObjects.value = convertToSchemaDiffObjects(result.diffs, result.functionDiffs, result.sequenceDiffs, result.ruleDiffs, result.ownerDiffs, result.renameCandidates);
@@ -686,13 +687,19 @@ function formatSchemaSyncPlan(plan: Awaited<ReturnType<typeof api.generateSchema
   return { forwardSql, rollbackSql: nextRollbackSql };
 }
 
+function clearSelectedDeploySql() {
+  selectedForwardDeploySql.value = "";
+  selectedDeploySql.value = "";
+  rollbackSql.value = "";
+  rollbackCompleteness.value = "complete";
+  missingRollbackObjects.value = [];
+}
+
 async function regenerateSelectedDeploySql() {
   const result = lastDiffResult.value;
   const generation = ++selectedDeploySqlGeneration;
+  clearSelectedDeploySql();
   if (!result) {
-    selectedForwardDeploySql.value = "-- No objects selected";
-    selectedDeploySql.value = "-- No objects selected";
-    rollbackSql.value = "";
     return;
   }
 
@@ -718,10 +725,10 @@ async function regenerateSelectedDeploySql() {
 async function regenerateFocusedDeploySql(objectId: string | null = selectedObjectId.value) {
   const result = lastDiffResult.value;
   const generation = ++focusedDeploySqlGeneration;
+  focusedForwardDeploySql.value = "";
+  focusedRollbackSql.value = "";
+  focusedDeploySql.value = "";
   if (!result || !objectId || !findSchemaDiffObject(diffObjects.value, objectId)) {
-    focusedForwardDeploySql.value = "-- No objects selected";
-    focusedRollbackSql.value = "";
-    focusedDeploySql.value = "-- No objects selected";
     return;
   }
 
@@ -759,7 +766,8 @@ const canExecuteDeploy = computed(() => {
   if (deploySqlMode.value === "rollback" && rollbackCompleteness.value === "incomplete") {
     return false;
   }
-  return true;
+  const sql = selectedDeploySql.value.trim();
+  return sql.length > 0 && sql !== "-- No objects selected";
 });
 
 const destructiveStatements = computed(() => {

apps/desktop/src/components/diff/__tests__/SchemaDiffDdlPanel.spec.ts

@@ -18,4 +18,12 @@ describe("SchemaDiffDdlPanel diff highlighting", () => {
     expect(panelSource).toContain("rollbackForwardSql?: string;");
     expect(panelSource).toContain("props.rollbackForwardSql ?? props.deploySql");
   });
+
+  it("does not expose selected-SQL execution from the focused script tab", () => {
+    const focusedScript = panelSource.slice(panelSource.indexOf("<!-- Deploy Script -->"), panelSource.indexOf("<!-- Deploy Script All -->"));
+    const selectedScript = panelSource.slice(panelSource.indexOf("<!-- Deploy Script All -->"));
+
+    expect(focusedScript).not.toContain("$emit('executeScript')");
+    expect(selectedScript).toContain("$emit('executeScript')");
+  });
 });

apps/desktop/src/components/diff/__tests__/SchemaDiffDialog.spec.ts

@@ -120,5 +120,7 @@ describe("SchemaDiffDialog fullscreen layout", () => {
     expect(dialogSource).toContain("sql: selectedDeploySql.value");
     expect(dialogSource).toContain("[selectedDeploySql.value]");
     expect(dialogSource).toContain("selectedObjectId.value !== objectId");
+    expect(dialogSource).toContain('selectedDeploySql.value = "";');
+    expect(dialogSource).toContain("const sql = selectedDeploySql.value.trim();");
   });
 });