fix(desktop): allow multiple new table structure tabs

apps/desktop/src/stores/queryStore.ts

@@ -234,16 +234,18 @@ export const useQueryStore = defineStore("query", () => {
 
   function openTableStructure(connectionId: string, database: string, schema?: string, tableName?: string) {
     const resolvedTableName = tableName || "";
-    const existing = tabs.value.find(
-      (tab) =>
-        tab.mode === "structure" &&
-        tab.connectionId === connectionId &&
-        tab.database === database &&
-        (tab.structureTableName || "") === resolvedTableName,
-    );
-    if (existing) {
-      activeTabId.value = existing.id;
-      return existing.id;
+    if (resolvedTableName) {
+      const existing = tabs.value.find(
+        (tab) =>
+          tab.mode === "structure" &&
+          tab.connectionId === connectionId &&
+          tab.database === database &&
+          (tab.structureTableName || "") === resolvedTableName,
+      );
+      if (existing) {
+        activeTabId.value = existing.id;
+        return existing.id;
+      }
     }
 
     const title = resolvedTableName

packages/app-tests/queryStore.test.ts

@@ -748,3 +748,22 @@ test("tab reuse is scoped by mode and schema instead of title alone", () => {
     restoreStorage();
   }
 });
+
+test("new table structure tabs can open multiple drafts while existing tables still reuse tabs", () => {
+  const restoreStorage = installMemoryStorage();
+  try {
+    setActivePinia(createPinia());
+    const store = useQueryStore();
+
+    const firstDraftId = store.openTableStructure("conn-1", "db", "public", "");
+    const secondDraftId = store.openTableStructure("conn-1", "db", "public", "");
+    const firstEditId = store.openTableStructure("conn-1", "db", "public", "users");
+    const secondEditId = store.openTableStructure("conn-1", "db", "public", "users");
+
+    assert.notEqual(secondDraftId, firstDraftId);
+    assert.equal(secondEditId, firstEditId);
+    assert.equal(store.tabs.length, 3);
+  } finally {
+    restoreStorage();
+  }
+});