diff --git a/tests/integration/log-work.test.ts b/tests/integration/log-work.test.ts
new file mode 100644
index 0000000..ee48fae
--- /dev/null
+++ b/tests/integration/log-work.test.ts
@@ -0,0 +1,95 @@
+import { describe, it, expect, beforeAll, afterAll } from "vitest";
+import PocketBase from "pocketbase";
+
+import { DEMO, adminPb, requireServices } from "./helpers";
+
+let admin: PocketBase;
+let projectId: string;
+
+beforeAll(async () => {
+  await requireServices();
+  admin = await adminPb();
+
+  const project = await admin
+    .collection("projects")
+    .getFirstListItem(`slug = "${DEMO.projectSlug}"`);
+  projectId = project.id;
+});
+
+describe("logWorkAction", () => {
+  const created: string[] = [];
+
+  afterAll(async () => {
+    for (const id of created) {
+      await admin.collection("commits").delete(id).catch(() => {});
+    }
+  });
+
+  it("refuses without a valid owner session", async () => {
+    // The action reads the session cookie via next/headers, which is not
+    // available outside a request in this harness — it must return a failure
+    // rather than silently succeed with no session.
+    const { logWorkAction } = await import("@/app/actions/log-work");
+    const result = await logWorkAction({
+      projectId,
+      clientSlug: DEMO.clientSlug,
+      projectSlug: DEMO.projectSlug,
+      date: "2026-09-19",
+      hours: 2,
+      message: "Should never be written",
+    });
+
+    expect(result.ok).toBe(false);
+
+    const rows = await admin.collection("commits").getFullList({
+      filter: `project = "${projectId}" && subject = "Should never be written"`,
+    });
+    expect(rows).toHaveLength(0);
+  });
+});
+
+describe("computeProjectMetrics via recomputeMetrics", () => {
+  let commitId: string;
+
+  afterAll(async () => {
+    if (commitId) await admin.collection("commits").delete(commitId).catch(() => {});
+  });
+
+  it("adds a manual entry's declared minutes to estimatedMinutes", async () => {
+    const before = await admin
+      .collection("project_metrics")
+      .getFirstListItem(`project = "${projectId}"`)
+      .catch(() => null);
+    const beforeMinutes = (before?.payload as { estimatedMinutes?: number } | undefined)
+      ?.estimatedMinutes ?? 0;
+
+    const commit = await admin.collection("commits").create({
+      project: projectId,
+      sha: `manual-test-${Date.now()}`,
+      short_sha: "manual",
+      message: "Integration test entry",
+      subject: "Integration test entry",
+      type: "",
+      scope: "",
+      authored_at: "2026-09-19 12:00:00.000Z",
+      is_merge: false,
+      additions: 0,
+      deletions: 0,
+      card: "",
+      link_source: "none",
+      url: "",
+      summary: "Integration test entry",
+      summary_version: 0,
+      summary_attempts: 0,
+      source: "manual",
+      manual_minutes: 90,
+    });
+    commitId = commit.id;
+
+    const { recomputeMetrics } = await import("@/lib/metrics/store");
+    const metrics = await recomputeMetrics(projectId);
+
+    expect(metrics.manualMinutes).toBeGreaterThanOrEqual(90);
+    expect(metrics.estimatedMinutes).toBeGreaterThanOrEqual(beforeMinutes + 90);
+  });
+});