diff --git a/TODO.md b/TODO.md
index 45a1df6..3d4b49e 100644
--- a/TODO.md
+++ b/TODO.md
@@ -186,7 +186,7 @@ This file is the single source of truth for roadmap and delivery progress.
 
 ### Testing
 
-- [ ] [P1] Unit tests for content schemas and service logic
+- [x] [P1] Unit tests for content schemas and service logic
 - [ ] [P1] Component tests for admin forms (pages/media/navigation)
 - [ ] [P1] Integration tests for owner invariant and hidden support-user protection
 - [ ] [P1] Integration tests for registration allow/deny behavior
@@ -280,6 +280,7 @@ This file is the single source of truth for roadmap and delivery progress.
 - [2026-02-12] Announcements/news baseline added: admin `/announcements` + `/news` management screens and public announcement rendering slots (`global_top`, `homepage`).
 - [2026-02-12] Public news routes now exist at `/news` and `/news/:slug` (detail restricted to published posts).
 - [2026-02-12] Added `e2e/happy-paths.pw.ts` covering admin login, page publish/public rendering, announcement rendering, media upload, and commission status transition.
+- [2026-02-12] Expanded unit coverage for content/domain schemas and post service behavior (`packages/content/src/domain-schemas.test.ts`, `packages/db/src/posts.test.ts`).
 
 ## How We Use This File
 
diff --git a/packages/content/src/domain-schemas.test.ts b/packages/content/src/domain-schemas.test.ts
new file mode 100644
index 0000000..d084c15
--- /dev/null
+++ b/packages/content/src/domain-schemas.test.ts
@@ -0,0 +1,67 @@
+import { describe, expect, it } from "vitest"
+
+import {
+  createAnnouncementInputSchema,
+  createCommissionInputSchema,
+  createCustomerInputSchema,
+  createNavigationMenuInputSchema,
+  createPageInputSchema,
+  updateCommissionStatusInputSchema,
+  updateNavigationItemInputSchema,
+} from "./index"
+
+describe("domain schemas", () => {
+  it("applies announcement defaults", () => {
+    const result = createAnnouncementInputSchema.parse({
+      title: "Notice",
+      message: "Open slots",
+    })
+
+    expect(result.placement).toBe("global_top")
+    expect(result.priority).toBe(100)
+    expect(result.isVisible).toBe(true)
+  })
+
+  it("validates customer and commission payloads", () => {
+    const customer = createCustomerInputSchema.safeParse({
+      name: "Ada",
+      email: "ada@example.com",
+    })
+    const commission = createCommissionInputSchema.safeParse({
+      title: "Portrait",
+      status: "new",
+    })
+
+    expect(customer.success).toBe(true)
+    expect(commission.success).toBe(true)
+  })
+
+  it("rejects invalid commission status updates", () => {
+    const result = updateCommissionStatusInputSchema.safeParse({
+      id: "550e8400-e29b-41d4-a716-446655440000",
+      status: "invalid",
+    })
+
+    expect(result.success).toBe(false)
+  })
+
+  it("validates page and navigation payload constraints", () => {
+    const page = createPageInputSchema.safeParse({
+      title: "About",
+      slug: "about",
+      content: "About page",
+    })
+    const menu = createNavigationMenuInputSchema.safeParse({
+      name: "Primary",
+      slug: "primary",
+    })
+    const navUpdate = updateNavigationItemInputSchema.safeParse({
+      id: "550e8400-e29b-41d4-a716-446655440000",
+      sortOrder: -1,
+    })
+
+    expect(page.success).toBe(true)
+    expect(menu.success).toBe(true)
+    expect(navUpdate.success).toBe(false)
+  })
+})
diff --git a/packages/db/src/posts.test.ts b/packages/db/src/posts.test.ts
new file mode 100644
index 0000000..1ce93b4
--- /dev/null
+++ b/packages/db/src/posts.test.ts
@@ -0,0 +1,75 @@
+import { beforeEach, describe, expect, it, vi } from "vitest"
+
+const { mockDb } = vi.hoisted(() => ({
+  mockDb: {
+    post: {
+      create: vi.fn(),
+      findMany: vi.fn(),
+      findUnique: vi.fn(),
+      update: vi.fn(),
+      delete: vi.fn(),
+    },
+  },
+}))
+
+vi.mock("./client", () => ({
+  db: mockDb,
+}))
+
+import { createPost, getPostBySlug, listPosts, updatePost } from "./posts"
+
+describe("posts service", () => {
+  beforeEach(() => {
+    for (const fn of Object.values(mockDb.post)) {
+      if (typeof fn === "function") {
+        fn.mockReset()
+      }
+    }
+  })
+
+  it("lists posts ordered by update date desc", async () => {
+    mockDb.post.findMany.mockResolvedValue([])
+
+    await listPosts()
+
+    expect(mockDb.post.findMany).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.findMany.mock.calls[0]?.[0]).toMatchObject({
+      orderBy: {
+        updatedAt: "desc",
+      },
+    })
+  })
+
+  it("parses create and update payloads through crud service", async () => {
+    mockDb.post.create.mockResolvedValue({ id: "post-1" })
+    mockDb.post.findUnique.mockResolvedValue({ id: "550e8400-e29b-41d4-a716-446655440000" })
+    mockDb.post.update.mockResolvedValue({ id: "post-1" })
+
+    await createPost({
+      title: "A title",
+      slug: "a-title",
+      body: "Body",
+      status: "draft",
+    })
+
+    await updatePost("550e8400-e29b-41d4-a716-446655440000", {
+      title: "Updated",
+    })
+
+    expect(mockDb.post.create).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.update).toHaveBeenCalledTimes(1)
+  })
+
+  it("finds posts by slug", async () => {
+    mockDb.post.findUnique.mockResolvedValue({ id: "post-1", slug: "hello" })
+
+    await getPostBySlug("hello")
+
+    expect(mockDb.post.findUnique).toHaveBeenCalledTimes(1)
+    expect(mockDb.post.findUnique).toHaveBeenCalledWith({
+      where: {
+        slug: "hello",
+      },
+    })
+  })
+})