feat: add dashboard persistence store

src/lib/server/db/dashboard-store.test.ts

@@ -2,7 +2,7 @@ import { existsSync, rmSync } from "node:fs";
 import { mkdtemp } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
-import { afterEach, describe, expect, test } from "vitest";
+import { afterEach, describe, expect, test, vi } from "vitest";
 import { genericDashboardFixture } from "$lib/model/fixtures/generic";
 import type { DashboardDocument } from "$lib/model";
 import {
@@ -15,6 +15,7 @@ const stores: DashboardStore[] = [];
 const tempRoots: string[] = [];
 
 afterEach(() => {
+  vi.useRealTimers();
   stores.splice(0).forEach((store) => store.close());
   tempRoots.splice(0).forEach((path) => rmSync(path, { force: true, recursive: true }));
 });
@@ -130,6 +131,40 @@ describe("dashboard persistence store", () => {
       "seed",
     ]);
   });
+
+  test("assigns monotonic revision timestamps for stable history ordering", async () => {
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date("2026-06-18T12:00:00.000Z"));
+    const { store } = await createTestStore();
+    const seed = store.seedDashboardIfEmpty(genericDashboardFixture, {
+      actor: "test-seed",
+    });
+    const updated = cloneDashboard({
+      ...genericDashboardFixture,
+      metadata: {
+        ...genericDashboardFixture.metadata,
+        title: "Changed Dashboard",
+      },
+    });
+
+    const commit = store.commitDashboard(updated, { actor: "agent" });
+    const rollback = store.rollbackToRevision(seed.id, { actor: "operator" });
+
+    expect([
+      seed.createdAt.toISOString(),
+      commit.createdAt.toISOString(),
+      rollback.createdAt.toISOString(),
+    ]).toEqual([
+      "2026-06-18T12:00:00.000Z",
+      "2026-06-18T12:00:00.001Z",
+      "2026-06-18T12:00:00.002Z",
+    ]);
+    expect(store.listRevisions().map((item) => item.id)).toEqual([
+      rollback.id,
+      commit.id,
+      seed.id,
+    ]);
+  });
 });
 
 async function createTestStore() {

src/lib/server/db/dashboard-store.ts

@@ -185,7 +185,7 @@ class SqliteDashboardStore implements DashboardStore {
       throw new DashboardPersistenceValidationError(migration.failure);
     }
 
-    const now = new Date();
+    const now = this.nextRevisionTimestamp();
     const revision: DashboardRevision = {
       id: randomUUID(),
       dashboardId: this.dashboardId,
@@ -230,6 +230,13 @@ class SqliteDashboardStore implements DashboardStore {
 
     return revision;
   }
+
+  private nextRevisionTimestamp(): Date {
+    const active = this.getActiveDashboard();
+    const activeUpdatedAtMs = active?.updatedAt.getTime() || 0;
+
+    return new Date(Math.max(Date.now(), activeUpdatedAtMs + 1));
+  }
 }
 
 type DashboardRevisionRow = typeof dashboardRevisions.$inferSelect;