diff --git a/packages/adapters/src/media/video-operations.postgres.test.ts b/packages/adapters/src/media/video-operations.postgres.test.ts
new file mode 100644
index 0000000..7f5592d
--- /dev/null
+++ b/packages/adapters/src/media/video-operations.postgres.test.ts
@@ -0,0 +1,214 @@
+import { randomUUID } from "node:crypto";
+import { mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import type { JobPublisher } from "@rakazo/adapter-kit";
+import type { MediaJobBlock, MessageBlock } from "@rakazo/contracts";
+import type { PrismaClient } from "@rakazo/db";
+import { createDb } from "@rakazo/db";
+import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { storeArtifactFromFile } from "../artifact-files.js";
+import { LocalArtifactStore } from "../artifacts.js";
+import { createMediaRuntime, MediaJobRejectedError } from "../media-runtime.js";
+import { detectFfmpeg } from "./ffmpeg.js";
+import type { TestClips } from "./media-test-support.js";
+import { createTestClips } from "./media-test-support.js";
+import { createVideoOperations } from "./video-operations.js";
+
+// CI runners may not have ffmpeg; the suite runs wherever both it and Postgres are available.
+const describePostgres =
+  process.env.VERIFY_DATABASE && process.env.DATABASE_URL && (await detectFfmpeg())
+    ? describe.sequential
+    : describe.skip;
+
+describePostgres("video operations in the media runtime (PostgreSQL + ffmpeg)", () => {
+  let db: ReturnType<typeof createDb>;
+  let prisma: PrismaClient;
+  let root: string;
+  let clips: TestClips;
+  const users: string[] = [];
+
+  beforeAll(async () => {
+    db = createDb(process.env.DATABASE_URL!);
+    prisma = db.prisma;
+    root = await mkdtemp(join(tmpdir(), "video-operations-pg-"));
+    clips = await createTestClips();
+  });
+
+  afterAll(async () => {
+    if (!db) return;
+    await prisma.mediaJob.deleteMany({ where: { userId: { in: users } } });
+    await prisma.artifact.deleteMany({ where: { userId: { in: users } } });
+    await prisma.organization.deleteMany({ where: { id: { in: users } } });
+    await prisma.user.deleteMany({ where: { id: { in: users } } });
+    await prisma.$disconnect();
+    await db.pool.end();
+    await rm(root, { recursive: true, force: true });
+    await rm(clips.dir, { recursive: true, force: true });
+  });
+
+  async function setup() {
+    const id = randomUUID();
+    users.push(id);
+    await prisma.user.create({
+      data: { id, name: "Video test", email: `${id}@example.test`, emailVerified: true },
+    });
+    await prisma.organization.create({
+      data: { id, name: "Video test", slug: id, createdAt: new Date() },
+    });
+    await prisma.space.create({ data: { id, organizationId: id, name: "Media", isDefault: true } });
+    await prisma.member.create({
+      data: { id, organizationId: id, userId: id, role: "owner", createdAt: new Date() },
+    });
+    const bot = await prisma.bot.create({
+      data: { spaceId: id, userId: id, name: "Studio", color: "test-color" },
+    });
+    const thread = await prisma.thread.create({ data: { spaceId: id, userId: id, botId: bot.id } });
+    const jobs: JobPublisher = {
+      enqueue: async () => undefined,
+      cancel: async () => undefined,
+      close: async () => undefined,
+    };
+    const artifacts = new LocalArtifactStore(join(root, id, "artifacts"));
+    const runtime = createMediaRuntime(
+      {
+        prisma,
+        events: { notify: async () => undefined },
+        jobs,
+        artifacts,
+        registrations: createVideoOperations(),
+      },
+      { tempRoot: join(root, id, "jobs") },
+    );
+    const scope = {
+      spaceId: id,
+      userId: id,
+      botId: bot.id,
+      groupId: null,
+      threadId: thread.id,
+      runId: null,
+    };
+    const store = async (path: string, name: string, mimeType: string) =>
+      (
+        await storeArtifactFromFile(
+          { prisma, artifacts },
+          {
+            path,
+            name,
+            mimeType,
+            spaceId: id,
+            userId: id,
+            botId: bot.id,
+            groupId: null,
+            runId: null,
+          },
+        )
+      ).id;
+    return { runtime, scope, store };
+  }
+
+  async function card(messageId: string, jobId: string): Promise<MediaJobBlock | undefined> {
+    const message = await prisma.message.findUniqueOrThrow({ where: { id: messageId } });
+    return (message.blocks as MessageBlock[]).find(
+      (block): block is MediaJobBlock => block.kind === "media" && block.jobId === jobId,
+    );
+  }
+
+  it("edits a stored video into a linked 9:16 version with a poster on the card", async () => {
+    const { runtime, scope, store } = await setup();
+    const source = await store(clips.landscape, "holiday.mp4", "video/mp4");
+    const subtitles = await store(clips.srt, "holiday.srt", "application/x-subrip");
+    const started = await runtime.start({
+      ...scope,
+      operation: "edit_video",
+      input: {
+        artifact_id: source,
+        title: "Urlaub 9:16",
+        steps: [
+          { op: "trim", start: 0.5, end: 2.5 },
+          { op: "reframe", preset: "vertical", fit: "blur" },
+          { op: "subtitles", artifact_id: subtitles },
+        ],
+      },
+    });
+    await runtime.runJob(started.jobId);
+    const job = await runtime.get(started.jobId);
+    expect(job).toMatchObject({ status: "done", title: "Urlaub 9:16", progress: 1 });
+    const [output] = job!.outputs;
+    expect(output).toMatchObject({
+      kind: "video",
+      mimeType: "video/mp4",
+      name: "Urlaub 9 16.mp4",
+      width: 1080,
+      height: 1920,
+      parentArtifactId: source,
+    });
+    expect(output?.posterArtifactId).toBeDefined();
+    const poster = await prisma.artifact.findUniqueOrThrow({
+      where: { id: output!.posterArtifactId! },
+    });
+    expect(poster.mimeType).toBe("image/jpeg");
+    const stored = await prisma.artifact.findUniqueOrThrow({ where: { id: output!.artifactId } });
+    expect(stored).toMatchObject({ parentArtifactId: source, width: 1080, height: 1920 });
+    expect(Math.abs((stored.durationMs ?? 0) - 2000)).toBeLessThan(150);
+    expect(await card(started.messageId, started.jobId)).toMatchObject({
+      status: "done",
+      outputs: job?.outputs,
+    });
+  });
+
+  it("exports one stored version per preset", async () => {
+    const { runtime, scope, store } = await setup();
+    const source = await store(clips.landscape, "holiday.mp4", "video/mp4");
+    const started = await runtime.start({
+      ...scope,
+      operation: "export_video",
+      input: { artifact_id: source, presets: ["square", "portrait"] },
+    });
+    await runtime.runJob(started.jobId);
+    const job = await runtime.get(started.jobId);
+    expect(job).toMatchObject({ status: "done", title: "1:1 · 4:5" });
+    expect(
+      job?.outputs.map((output) => [output.name, output.preset, output.width, output.height]),
+    ).toEqual([
+      ["holiday-1x1.mp4", "square", 1080, 1080],
+      ["holiday-4x5.mp4", "portrait", 1080, 1350],
+    ]);
+  });
+
+  it("refuses appended clips and subtitles the user cannot read", async () => {
+    const { runtime, scope, store } = await setup();
+    const other = await setup();
+    const source = await store(clips.landscape, "mine.mp4", "video/mp4");
+    const foreignClip = await other.store(clips.silentPortrait, "theirs.mp4", "video/mp4");
+    const foreignSubtitles = await other.store(clips.srt, "theirs.srt", "application/x-subrip");
+    for (const step of [
+      { op: "concat", artifact_ids: [foreignClip] },
+      { op: "subtitles", artifact_id: foreignSubtitles },
+    ]) {
+      await expect(
+        runtime.start({
+          ...scope,
+          operation: "edit_video",
+          input: { artifact_id: source, title: "x", steps: [step] },
+        }),
+      ).rejects.toThrow(MediaJobRejectedError);
+    }
+  });
+
+  it("fails the job with a readable error when a range is outside the video", async () => {
+    const { runtime, scope, store } = await setup();
+    const source = await store(clips.landscape, "short.mp4", "video/mp4");
+    const started = await runtime.start({
+      ...scope,
+      operation: "edit_video",
+      input: { artifact_id: source, title: "x", steps: [{ op: "trim", start: 10, end: 20 }] },
+    });
+    await runtime.runJob(started.jobId);
+    expect(await runtime.get(started.jobId)).toMatchObject({
+      status: "failed",
+      error: "trim 10–20 s is outside the 3 s video.",
+      outputs: [],
+    });
+  });
+});
diff --git a/packages/testkit/src/cli/harness.ts b/packages/testkit/src/cli/harness.ts
index fc38326..ce36780 100644
--- a/packages/testkit/src/cli/harness.ts
+++ b/packages/testkit/src/cli/harness.ts
@@ -118,6 +118,7 @@ async function main() {
         "packages/adapters/src/job-reconciler.postgres.test.ts",
         "packages/adapters/src/cloud-agent.postgres.test.ts",
         "packages/adapters/src/media/image-operations.postgres.test.ts",
+        "packages/adapters/src/media/video-operations.postgres.test.ts",
         "packages/adapters/src/media-runtime.postgres.test.ts",
         "packages/adapters/src/builtin-memory-provider.postgres.test.ts",
         "packages/adapters/src/profile-consolidation.postgres.test.ts",