fix(export): allow routine-only database exports

Closes #6888

packages/app-tests/databaseExportPlan.test.ts

@@ -1,6 +1,40 @@
 import assert from "node:assert/strict";
 import { test } from "vitest";
 import { buildAllDatabaseExportPlan } from "../../apps/desktop/src/lib/export/databaseExport.ts";
+import { isDatabaseExportTableSelectionValid } from "../../apps/desktop/src/lib/export/databaseExportSelection.ts";
+
+test("database export allows object-only exports without selecting tables", () => {
+  assert.equal(
+    isDatabaseExportTableSelectionValid({
+      allTableCount: 982,
+      selectedTableCount: 0,
+      includeStructure: false,
+      includeData: false,
+    }),
+    true,
+  );
+});
+
+test("database export still requires a table when exporting structure or data", () => {
+  assert.equal(
+    isDatabaseExportTableSelectionValid({
+      allTableCount: 982,
+      selectedTableCount: 0,
+      includeStructure: true,
+      includeData: false,
+    }),
+    false,
+  );
+  assert.equal(
+    isDatabaseExportTableSelectionValid({
+      allTableCount: 982,
+      selectedTableCount: 1,
+      includeStructure: false,
+      includeData: true,
+    }),
+    true,
+  );
+});
 
 test("all-database export includes every schema for schema-aware databases", () => {
   const plan = buildAllDatabaseExportPlan({