diff --git a/test/integration/orb-fleet-e2e.test.ts b/test/integration/orb-fleet-e2e.test.ts
new file mode 100644
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+++ b/test/integration/orb-fleet-e2e.test.ts
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+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { computeFleetAnalytics } from "../../src/orb/analytics";
+import { handleOrbIngest } from "../../src/orb/ingest";
+import { exportOrbBatch } from "../../src/selfhost/orb-collector";
+import { createTestEnv } from "../helpers/d1";
+
+// End-to-end seam test for the Orb fleet pipeline: a self-host instance's review_audit ledger →
+// exportOrbBatch (the FLEET_QUERY join + payload) → handleOrbIngest (orb_signals upsert) →
+// computeFleetAnalytics. The three stages are unit-tested in isolation, but nothing else asserts they
+// COMPOSE on a consistent target_id/repo_hash/pr_hash key — the exact seam where the source filter or
+// the gate_decision↔pr_outcome join can silently break before anything fleet-derived is built on it.
+
+// Anonymization OFF so repo_hash/pr_hash are the readable project/target_id; the export gate is satisfied
+// for both the current (ORB_ENABLED) and hardwired (GITHUB_APP_PRIVATE_KEY) export paths.
+const ORB_ENV = {
+  ORB_ENABLED: "true",
+  ORB_ANONYMIZE: "false",
+  ORB_APP_ID: "orb-e2e",
+  ORB_WEBHOOK_SECRET: "e2e-secret",
+  GITHUB_APP_PRIVATE_KEY: "e2e-app-key",
+} as const;
+
+let saved: Record<string, string | undefined>;
+beforeEach(() => {
+  saved = {};
+  for (const [k, v] of Object.entries(ORB_ENV)) {
+    saved[k] = process.env[k];
+    process.env[k] = v;
+  }
+  delete process.env.ORB_AIR_GAP;
+});
+afterEach(() => {
+  for (const [k, v] of Object.entries(saved)) {
+    if (v === undefined) delete process.env[k];
+    else process.env[k] = v;
+  }
+});
+
+const PROJECT = "owner/repo";
+let rowSeq = 0;
+
+/** A fetch stub that records the single exported request body (always a string). */
+function capturingFetch(): { fn: typeof fetch; body: () => string } {
+  let captured = "";
+  const fn = (async (_url: string, init?: RequestInit) => {
+    captured = String(init?.body);
+    return new Response(null, { status: 200 });
+  }) as unknown as typeof fetch;
+  return { fn, body: () => captured };
+}
+
+/** Seed a complete review_audit "decided PR": a native gate_decision + the realized pr_outcome (+ a reversal). */
+async function seedDecidedPr(
+  db: D1Database,
+  opts: { pr: number; verdict: "merge" | "close"; outcome: "merged" | "closed"; reversal?: "reversal_reverted" | "reversal_reopened" },
+): Promise<void> {
+  const targetId = `${PROJECT}#${opts.pr}`;
+  const at = (hour: number): string => `2026-06-01T0${hour}:00:00Z`;
+  const insert = (id: string, eventType: string, decision: string | null, createdAt: string): Promise<unknown> =>
+    db
+      .prepare(`INSERT INTO review_audit (id, project, target_id, event_type, decision, source, head_sha, summary, created_at) VALUES (?, ?, ?, ?, ?, 'gittensory-native', ?, 'ready', ?)`)
+      .bind(id, PROJECT, targetId, eventType, decision, `sha${opts.pr}`, createdAt)
+      .run();
+  await insert(`gd-${rowSeq++}`, "gate_decision", opts.verdict, at(1));
+  await insert(`po-${rowSeq++}`, "pr_outcome", opts.outcome, at(2));
+  if (opts.reversal) await insert(`rev-${rowSeq++}`, opts.reversal, null, at(3));
+}
+
+// Forward-compat with the instance-registration gate (#1274): only registered instances count toward the
+// fleet. A no-op before that migration lands (the orb_instances table won't exist yet → the insert is ignored).
+async function registerInstance(db: D1Database, instanceId: string): Promise<void> {
+  try {
+    await db
+      .prepare(`INSERT INTO orb_instances (instance_id, registered) VALUES (?, 1) ON CONFLICT(instance_id) DO UPDATE SET registered=1`)
+      .bind(instanceId)
+      .run();
+  } catch {
+    // orb_instances doesn't exist until #1274's migration — before then, no registration is needed.
+  }
+}
+
+describe("Orb fleet pipeline end-to-end (review_audit → export → ingest → analytics)", () => {
+  it("carries 5 clean merges through every stage into a 100%-precision fleet of one", async () => {
+    const env = createTestEnv();
+    for (let pr = 1; pr <= 5; pr++) await seedDecidedPr(env.DB, { pr, verdict: "merge", outcome: "merged" });
+
+    // Stage 1: export reads the ledger and builds the anonymized batch (captured, not sent).
+    const cap = capturingFetch();
+    const exported = await exportOrbBatch(env.DB, 200, cap.fn);
+    expect(exported).toBe(5);
+    const payload = JSON.parse(cap.body()) as { instance_id: string; events: Array<Record<string, unknown>> };
+    expect(payload.events).toHaveLength(5);
+    expect(payload.events[0]).toMatchObject({
+      repo_hash: PROJECT,
+      pr_hash: `${PROJECT}#1`,
+      gate_verdict: "merge",
+      outcome: "merged",
+      reversal_flag: "none",
+    });
+
+    // Stage 2: the central collector ingests that exact payload into orb_signals.
+    expect(await handleOrbIngest(cap.body(), env.DB)).toEqual({ accepted: 5 });
+
+    // Stage 3: analytics aggregates the instance — 5 decided ≥ MIN_DECIDED, all correct merges.
+    await registerInstance(env.DB, payload.instance_id);
+    const fleet = await computeFleetAnalytics(env, { windowDays: 365 });
+    expect(fleet.instanceCount).toBe(1);
+    expect(fleet.fleet.mergePrecision).toBe(1);
+    expect(fleet.fleet.reversalRate).toBe(0);
+    expect(fleet.instances[0]?.instanceId).toBe(payload.instance_id);
+  });
+
+  it("propagates a human reversal (reverted merge) end-to-end into the fleet's reversal + FP rates", async () => {
+    const env = createTestEnv();
+    for (let pr = 1; pr <= 5; pr++) await seedDecidedPr(env.DB, { pr, verdict: "merge", outcome: "merged" });
+    await seedDecidedPr(env.DB, { pr: 6, verdict: "merge", outcome: "merged", reversal: "reversal_reverted" });
+
+    const cap = capturingFetch();
+    expect(await exportOrbBatch(env.DB, 200, cap.fn)).toBe(6);
+    const reverted = (JSON.parse(cap.body()) as { events: Array<Record<string, unknown>> }).events.find((e) => e.pr_hash === `${PROJECT}#6`);
+    expect(reverted?.reversal_flag).toBe("reverted");
+
+    expect(await handleOrbIngest(cap.body(), env.DB)).toEqual({ accepted: 6 });
+
+    await registerInstance(env.DB, (JSON.parse(cap.body()) as { instance_id: string }).instance_id);
+    const fleet = await computeFleetAnalytics(env, { windowDays: 365 });
+    expect(fleet.instanceCount).toBe(1);
+    expect(fleet.fleet.reversalRate).toBeCloseTo(1 / 6, 5);
+    expect(fleet.fleet.fpRate).toBeGreaterThan(0); // a reverted merge is a false positive
+  });
+});