diff --git a/tests/helpers/factories.ts b/tests/helpers/factories.ts
index 656fec6..5afc23c 100644
--- a/tests/helpers/factories.ts
+++ b/tests/helpers/factories.ts
@@ -10,12 +10,19 @@
  *     — return in-memory objects suitable for unit tests with mocked `db`.
  */
 
+import { and, eq, sql } from 'drizzle-orm';
 import { db } from '@/lib/db';
 import { ports, type NewPort, type Port } from '@/lib/db/schema/ports';
 import { clients, type NewClient, type Client } from '@/lib/db/schema/clients';
 import { berths, type NewBerth, type Berth } from '@/lib/db/schema/berths';
 import { yachts, yachtOwnershipHistory, type NewYacht, type Yacht } from '@/lib/db/schema/yachts';
-import { companies, type NewCompany, type Company } from '@/lib/db/schema/companies';
+import {
+  companies,
+  companyMemberships,
+  type NewCompany,
+  type Company,
+} from '@/lib/db/schema/companies';
+import { berthReservations, type BerthReservation } from '@/lib/db/schema/reservations';
 
 // ─── Port ────────────────────────────────────────────────────────────────────
 
@@ -119,6 +126,125 @@ export async function makeCompany(args: {
   return company!;
 }
 
+// ─── Company Membership ──────────────────────────────────────────────────────
+
+export async function makeMembership(args: {
+  companyId: string;
+  clientId: string;
+  role?: string;
+  roleDetail?: string;
+  startDate?: Date;
+  endDate?: Date | null;
+  isPrimary?: boolean;
+  notes?: string;
+}) {
+  const [row] = await db
+    .insert(companyMemberships)
+    .values({
+      companyId: args.companyId,
+      clientId: args.clientId,
+      role: args.role ?? 'director',
+      roleDetail: args.roleDetail ?? null,
+      startDate: args.startDate ?? new Date(),
+      endDate: args.endDate ?? null,
+      isPrimary: args.isPrimary ?? false,
+      notes: args.notes ?? null,
+    })
+    .returning();
+  if (!row) throw new Error('Failed to create membership');
+  return row;
+}
+
+// ─── Berth Reservation ───────────────────────────────────────────────────────
+
+export async function makeReservation(args: {
+  berthId: string;
+  portId: string;
+  clientId: string;
+  yachtId: string;
+  status: 'pending' | 'active' | 'ended' | 'cancelled';
+  startDate?: Date;
+  endDate?: Date | null;
+  tenureType?: 'permanent' | 'fixed_term' | 'seasonal';
+  interestId?: string;
+  createdBy?: string;
+  notes?: string;
+}): Promise<BerthReservation> {
+  const [row] = await db
+    .insert(berthReservations)
+    .values({
+      berthId: args.berthId,
+      portId: args.portId,
+      clientId: args.clientId,
+      yachtId: args.yachtId,
+      interestId: args.interestId ?? null,
+      status: args.status,
+      startDate: args.startDate ?? new Date(),
+      endDate: args.endDate ?? null,
+      tenureType: args.tenureType ?? 'permanent',
+      contractFileId: null,
+      notes: args.notes ?? null,
+      createdBy: args.createdBy ?? 'seed-user',
+    })
+    .returning();
+  if (!row) throw new Error('Failed to create reservation');
+  return row;
+}
+
+// ─── Yacht Ownership Transfer ────────────────────────────────────────────────
+
+export async function makeOwnershipTransfer(args: {
+  yachtId: string;
+  newOwner: { type: 'client' | 'company'; id: string };
+  effectiveDate?: Date;
+  transferReason?: string;
+  transferNotes?: string;
+  createdBy?: string;
+}) {
+  const effective = args.effectiveDate ?? new Date();
+  const createdBy = args.createdBy ?? 'seed-user';
+  return await db.transaction(async (tx) => {
+    // Close current open row
+    await tx
+      .update(yachtOwnershipHistory)
+      .set({ endDate: effective })
+      .where(
+        and(
+          eq(yachtOwnershipHistory.yachtId, args.yachtId),
+          sql`${yachtOwnershipHistory.endDate} IS NULL`,
+        ),
+      );
+
+    // Insert new open row
+    const [newHistory] = await tx
+      .insert(yachtOwnershipHistory)
+      .values({
+        yachtId: args.yachtId,
+        ownerType: args.newOwner.type,
+        ownerId: args.newOwner.id,
+        startDate: effective,
+        endDate: null,
+        transferReason: args.transferReason ?? null,
+        transferNotes: args.transferNotes ?? null,
+        createdBy,
+      })
+      .returning();
+
+    // Update yacht's denormalized current owner
+    const [updated] = await tx
+      .update(yachts)
+      .set({
+        currentOwnerType: args.newOwner.type,
+        currentOwnerId: args.newOwner.id,
+        updatedAt: new Date(),
+      })
+      .where(eq(yachts.id, args.yachtId))
+      .returning();
+
+    return { history: newHistory!, yacht: updated! };
+  });
+}
+
 // ─── Webhook ──────────────────────────────────────────────────────────────────
 
 export interface WebhookData {
diff --git a/tests/integration/factories-smoke.test.ts b/tests/integration/factories-smoke.test.ts
new file mode 100644
index 0000000..c0a7e12
--- /dev/null
+++ b/tests/integration/factories-smoke.test.ts
@@ -0,0 +1,70 @@
+import { describe, it, expect } from 'vitest';
+import {
+  makePort,
+  makeClient,
+  makeCompany,
+  makeBerth,
+  makeYacht,
+  makeMembership,
+  makeReservation,
+  makeOwnershipTransfer,
+} from '../helpers/factories';
+import { db } from '@/lib/db';
+import { yachtOwnershipHistory } from '@/lib/db/schema';
+import { eq, isNull, and } from 'drizzle-orm';
+
+describe('factory helpers smoke', () => {
+  it('makeMembership inserts a row', async () => {
+    const port = await makePort();
+    const client = await makeClient({ portId: port.id });
+    const company = await makeCompany({ portId: port.id });
+    const m = await makeMembership({ companyId: company.id, clientId: client.id });
+    expect(m.role).toBe('director');
+    expect(m.endDate).toBeNull();
+  });
+
+  it('makeReservation inserts a row in any status', async () => {
+    const port = await makePort();
+    const berth = await makeBerth({ portId: port.id });
+    const client = await makeClient({ portId: port.id });
+    const yacht = await makeYacht({
+      portId: port.id,
+      ownerType: 'client',
+      ownerId: client.id,
+    });
+    const r = await makeReservation({
+      berthId: berth.id,
+      portId: port.id,
+      clientId: client.id,
+      yachtId: yacht.id,
+      status: 'pending',
+    });
+    expect(r.status).toBe('pending');
+  });
+
+  it('makeOwnershipTransfer closes prior history and opens new', async () => {
+    const port = await makePort();
+    const clientA = await makeClient({ portId: port.id });
+    const clientB = await makeClient({ portId: port.id });
+    const yacht = await makeYacht({
+      portId: port.id,
+      ownerType: 'client',
+      ownerId: clientA.id,
+    });
+
+    const { yacht: updated } = await makeOwnershipTransfer({
+      yachtId: yacht.id,
+      newOwner: { type: 'client', id: clientB.id },
+    });
+    expect(updated.currentOwnerId).toBe(clientB.id);
+
+    const open = await db
+      .select()
+      .from(yachtOwnershipHistory)
+      .where(
+        and(eq(yachtOwnershipHistory.yachtId, yacht.id), isNull(yachtOwnershipHistory.endDate)),
+      );
+    expect(open).toHaveLength(1);
+    expect(open[0]!.ownerId).toBe(clientB.id);
+  });
+});