diff --git a/backend/package.json b/backend/package.json
index 5b35e94..d79bc55 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -17,7 +17,7 @@
     "db:migrate:verify": "npm run build && node dist/db/migrate-cli.js verify",
     "db:migrate:down": "npm run build && node dist/db/migrate-cli.js down",
     "test:mysql:migration": "npm run build && node tests/mysql-migration-roundtrip.test.mjs",
-    "test": "npm run build && node tests/backend-contract.test.mjs && node tests/migration-contract.test.mjs && node tests/mysql-pool-contract.test.mjs && node tests/migration-runner.test.mjs && node tests/legacy-money.test.mjs && node tests/legacy-read-repository.test.mjs && node tests/task-repository.test.mjs && node tests/platform-config-repository.test.mjs && node tests/auth.test.mjs && node tests/rbac.test.mjs && node tests/user-management.test.mjs && node tests/store-room.test.mjs && node tests/content-management.test.mjs && node tests/store-discovery.test.mjs && node tests/store-access.test.mjs && node tests/pricing.test.mjs"
+    "test": "npm run build && node tests/backend-contract.test.mjs && node tests/migration-contract.test.mjs && node tests/mysql-pool-contract.test.mjs && node tests/migration-runner.test.mjs && node tests/legacy-money.test.mjs && node tests/legacy-read-repository.test.mjs && node tests/task-repository.test.mjs && node tests/platform-config-repository.test.mjs && node tests/auth.test.mjs && node tests/rbac.test.mjs && node tests/user-management.test.mjs && node tests/store-room.test.mjs && node tests/content-management.test.mjs && node tests/store-discovery.test.mjs && node tests/store-access.test.mjs && node tests/pricing.test.mjs && node tests/order-state.test.mjs"
   },
   "dependencies": {
     "@fastify/cors": "^11.2.0",
diff --git a/backend/src/app.ts b/backend/src/app.ts
index 3f4e3e7..c5a1cb8 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -30,6 +30,9 @@ import {
   type StoreAccessRouteOptions
 } from './routes/store-access.js';
 import { registerPricingRoutes, type PricingRouteOptions } from './routes/pricing.js';
+import {
+  registerOrderStateRoutes, type OrderStateRouteOptions
+} from './routes/order-state.js';
 
 export interface BuildAppOptions {
   config?: AppConfig;
@@ -41,6 +44,7 @@ export interface BuildAppOptions {
   storeDiscovery?: StoreDiscoveryRouteOptions;
   storeAccess?: StoreAccessRouteOptions;
   pricing?: PricingRouteOptions;
+  orderState?: OrderStateRouteOptions;
 }
 
 declare module 'fastify' {
@@ -107,6 +111,9 @@ export async function buildApp(options: BuildAppOptions = {}): Promise<FastifyIn
   if (options.pricing) {
     await registerPricingRoutes(app, options.pricing);
   }
+  if (options.orderState) {
+    await registerOrderStateRoutes(app, options.orderState);
+  }
 
   return app;
 }
diff --git a/backend/src/db/migration-runner.ts b/backend/src/db/migration-runner.ts
index d914522..623c8c5 100644
--- a/backend/src/db/migration-runner.ts
+++ b/backend/src/db/migration-runner.ts
@@ -31,7 +31,8 @@ const migrationFiles: Record<MigrationDirection, readonly string[]> = {
     'database/migrations/2026061808_m03b_decoration_ads_media.up.sql',
     'database/migrations/2026061809_m03c_store_discovery.up.sql',
     'database/migrations/2026061810_m03d_scene_wifi_access.up.sql',
-    'database/migrations/2026061811_m04a_pricing_reservations.up.sql'
+    'database/migrations/2026061811_m04a_pricing_reservations.up.sql',
+    'database/migrations/2026062012_m04b_order_state_machine.up.sql'
   ],
   verify: [
     'database/migrations/2026061601_m01b_core_schema.verify.sql',
@@ -44,9 +45,11 @@ const migrationFiles: Record<MigrationDirection, readonly string[]> = {
     'database/migrations/2026061808_m03b_decoration_ads_media.verify.sql',
     'database/migrations/2026061809_m03c_store_discovery.verify.sql',
     'database/migrations/2026061810_m03d_scene_wifi_access.verify.sql',
-    'database/migrations/2026061811_m04a_pricing_reservations.verify.sql'
+    'database/migrations/2026061811_m04a_pricing_reservations.verify.sql',
+    'database/migrations/2026062012_m04b_order_state_machine.verify.sql'
   ],
   down: [
+    'database/migrations/2026062012_m04b_order_state_machine.down.sql',
     'database/migrations/2026061811_m04a_pricing_reservations.down.sql',
     'database/migrations/2026061810_m03d_scene_wifi_access.down.sql',
     'database/migrations/2026061809_m03c_store_discovery.down.sql',
@@ -184,7 +187,8 @@ export async function executeMigrationPlan(
         3, 3, 1,
         2, 2, 1,
         3, 3, 1,
-        2, 1, 3, 3, 1
+        2, 1, 3, 3, 1,
+        2, 1, 3, 1
       ][index] ?? 1;
       if (!Array.isArray(result) || result.length < minimumRows) {
         throw new Error(
diff --git a/backend/src/orders/order-state-repository.ts b/backend/src/orders/order-state-repository.ts
new file mode 100644
index 0000000..2801ba9
--- /dev/null
+++ b/backend/src/orders/order-state-repository.ts
@@ -0,0 +1,249 @@
+import type { PoolConnection, ResultSetHeader, RowDataPacket } from 'mysql2/promise';
+import type { AccessProfile } from '../auth/rbac-repository.js';
+import type { MySqlPool } from '../db/mysql.js';
+
+export const orderActions = [
+  'SUBMIT', 'CONFIRM_PAYMENT', 'RESERVE', 'START', 'FINISH', 'CANCEL',
+  'BEGIN_REFUND', 'COMPLETE_REFUND', 'CLOSE'
+] as const;
+export type OrderAction = typeof orderActions[number];
+export type OrderStatus =
+  | 'DRAFT' | 'PENDING_PAYMENT' | 'PAID' | 'RESERVED' | 'IN_PROGRESS'
+  | 'FINISHED' | 'CANCELLED' | 'REFUNDING' | 'REFUNDED' | 'CLOSED';
+
+export interface OrderActor {
+  tenantId: string;
+  userId: string;
+  actorType: 'USER' | 'SYSTEM';
+  source: 'APP' | 'ADMIN' | 'PAYMENT' | 'WORKER' | 'SYSTEM';
+  traceId: string;
+  ip: string;
+  userAgent: string;
+  access?: AccessProfile;
+}
+
+interface OrderRow extends RowDataPacket {
+  id: string;
+  storeId: string;
+  status: OrderStatus;
+  statusVersion: number;
+}
+interface HistoryRow extends RowDataPacket {
+  id: string;
+  fromStatus: OrderStatus | null;
+  toStatus: OrderStatus;
+  action: OrderAction | 'CREATED' | 'EXPIRED' | 'MIGRATED';
+  actorType: string;
+  actorId: string | null;
+  source: string;
+  reason: string;
+  traceId: string;
+  createdAt: Date;
+}
+
+const targetByAction: Record<OrderAction, OrderStatus> = {
+  SUBMIT: 'PENDING_PAYMENT',
+  CONFIRM_PAYMENT: 'PAID',
+  RESERVE: 'RESERVED',
+  START: 'IN_PROGRESS',
+  FINISH: 'FINISHED',
+  CANCEL: 'CANCELLED',
+  BEGIN_REFUND: 'REFUNDING',
+  COMPLETE_REFUND: 'REFUNDED',
+  CLOSE: 'CLOSED'
+};
+
+const allowedActions: Record<OrderStatus, readonly OrderAction[]> = {
+  DRAFT: ['SUBMIT', 'CANCEL', 'CLOSE'],
+  PENDING_PAYMENT: ['CONFIRM_PAYMENT', 'CANCEL', 'CLOSE'],
+  PAID: ['RESERVE', 'START', 'CANCEL', 'BEGIN_REFUND'],
+  RESERVED: ['START', 'CANCEL', 'BEGIN_REFUND'],
+  IN_PROGRESS: ['FINISH', 'BEGIN_REFUND'],
+  FINISHED: ['BEGIN_REFUND', 'CLOSE'],
+  CANCELLED: ['BEGIN_REFUND', 'CLOSE'],
+  REFUNDING: ['COMPLETE_REFUND'],
+  REFUNDED: ['CLOSE'],
+  CLOSED: []
+};
+
+export class OrderStateError extends Error {
+  constructor(public readonly code: string) { super(code); }
+}
+
+export class OrderStateRepository {
+  constructor(private readonly pool: MySqlPool) {}
+
+  async transition(actor: OrderActor, orderId: string, action: OrderAction, reason = '') {
+    return this.transaction(async (connection) => {
+      const order = await this.loadOrder(connection, actor.tenantId, orderId, true);
+      await this.assertAuthorized(connection, actor, order, action);
+      const duplicate = await this.findByTrace(connection, actor.tenantId, orderId, actor.traceId);
+      if (duplicate) {
+        return {
+          orderId,
+          status: duplicate.toStatus,
+          statusVersion: null,
+          historyId: duplicate.id,
+          idempotent: true
+        };
+      }
+      if (!allowedActions[order.status].includes(action)) {
+        throw new OrderStateError('ORDER_TRANSITION_NOT_ALLOWED');
+      }
+      const targetStatus = targetByAction[action];
+      const nextVersion = Number(order.statusVersion) + 1;
+      await connection.execute(
+        `UPDATE qipai_orders
+         SET status = ?, status_version = ?, status_updated_at = UTC_TIMESTAMP(3)
+         WHERE tenant_id = ? AND id = ?`,
+        [targetStatus, nextVersion, actor.tenantId, orderId]
+      );
+      await this.applyReservationState(connection, actor.tenantId, orderId, targetStatus);
+      const [result] = await connection.execute<ResultSetHeader>(
+        `INSERT INTO qipai_order_status_history
+          (tenant_id, order_id, from_status, to_status, action, actor_type,
+           actor_id, source, reason, trace_id, metadata)
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, JSON_OBJECT('statusVersion', ?))`,
+        [actor.tenantId, orderId, order.status, targetStatus, action,
+          actor.actorType, actor.userId, actor.source, reason.slice(0, 512),
+          actor.traceId, nextVersion]
+      );
+      await connection.execute(
+        `INSERT INTO qipai_audit_logs
+          (tenant_id, actor_type, actor_id, action, resource_type, resource_id,
+           trace_id, ip, user_agent, metadata)
+         VALUES (?, ?, ?, 'ORDER_STATUS_CHANGED', 'ORDER', ?, ?, ?, ?,
+           JSON_OBJECT('fromStatus', ?, 'toStatus', ?, 'orderAction', ?))`,
+        [actor.tenantId, actor.actorType, actor.userId, orderId, actor.traceId,
+          actor.ip, actor.userAgent.slice(0, 255), order.status, targetStatus, action]
+      );
+      return {
+        orderId,
+        status: targetStatus,
+        statusVersion: nextVersion,
+        historyId: String(result.insertId),
+        idempotent: false
+      };
+    });
+  }
+
+  async history(tenantId: string, userId: string, orderId: string, access: AccessProfile) {
+    const order = await this.loadOrder(this.pool, tenantId, orderId, false);
+    const manager = canManageStore(access, order.storeId);
+    if (!manager) {
+      const [rows] = await this.pool.execute<RowDataPacket[]>(
+        `SELECT 1 FROM qipai_order_user_access
+         WHERE tenant_id = ? AND order_id = ? AND user_id = ?`,
+        [tenantId, orderId, userId]
+      );
+      if (!rows[0]) throw new OrderStateError('ORDER_ACCESS_FORBIDDEN');
+    }
+    const [rows] = await this.pool.execute<HistoryRow[]>(
+      `SELECT id, from_status AS fromStatus, to_status AS toStatus, action,
+              actor_type AS actorType, actor_id AS actorId, source, reason,
+              trace_id AS traceId, created_at AS createdAt
+       FROM qipai_order_status_history
+       WHERE tenant_id = ? AND order_id = ? ORDER BY id`,
+      [tenantId, orderId]
+    );
+    return rows.map((row) => ({
+      ...row,
+      id: String(row.id),
+      actorId: row.actorId === null ? null : String(row.actorId)
+    }));
+  }
+
+  private async assertAuthorized(
+    connection: PoolConnection, actor: OrderActor, order: OrderRow, action: OrderAction
+  ) {
+    if (actor.source !== 'APP') {
+      if (!actor.access || !canManageStore(actor.access, order.storeId)) {
+        throw new OrderStateError('ORDER_MANAGEMENT_FORBIDDEN');
+      }
+      return;
+    }
+    if (action !== 'CANCEL') throw new OrderStateError('ORDER_ACTION_FORBIDDEN');
+    const [rows] = await connection.execute<RowDataPacket[]>(
+      `SELECT 1 FROM qipai_order_user_access
+       WHERE tenant_id = ? AND order_id = ? AND user_id = ? AND revoked_at IS NULL`,
+      [actor.tenantId, order.id, actor.userId]
+    );
+    if (!rows[0]) throw new OrderStateError('ORDER_ACCESS_FORBIDDEN');
+  }
+
+  private async loadOrder(
+    connection: Pick<MySqlPool, 'execute'> | PoolConnection,
+    tenantId: string,
+    orderId: string,
+    lock: boolean
+  ) {
+    const [rows] = await connection.execute<OrderRow[]>(
+      `SELECT id, store_id AS storeId, status, status_version AS statusVersion
+       FROM qipai_orders
+       WHERE tenant_id = ? AND id = ? AND deleted_at IS NULL
+       ${lock ? 'FOR UPDATE' : ''}`,
+      [tenantId, orderId]
+    );
+    if (!rows[0]) throw new OrderStateError('ORDER_NOT_FOUND');
+    return rows[0];
+  }
+
+  private async findByTrace(
+    connection: PoolConnection, tenantId: string, orderId: string, traceId: string
+  ) {
+    const [rows] = await connection.execute<HistoryRow[]>(
+      `SELECT id, to_status AS toStatus
+       FROM qipai_order_status_history
+       WHERE tenant_id = ? AND order_id = ? AND trace_id = ? LIMIT 1`,
+      [tenantId, orderId, traceId]
+    );
+    return rows[0] ?? null;
+  }
+
+  private async applyReservationState(
+    connection: PoolConnection, tenantId: string, orderId: string, status: OrderStatus
+  ) {
+    if (['PAID', 'RESERVED', 'IN_PROGRESS', 'FINISHED'].includes(status)) {
+      await connection.execute(
+        `UPDATE qipai_room_reservations
+         SET status = 'CONSUMED', expires_at = GREATEST(expires_at, ends_at)
+         WHERE tenant_id = ? AND order_id = ? AND status = 'HELD'`,
+        [tenantId, orderId]
+      );
+    } else if (['CANCELLED', 'REFUNDED', 'CLOSED'].includes(status)) {
+      await connection.execute(
+        `UPDATE qipai_room_reservations
+         SET status = 'RELEASED', released_at = COALESCE(released_at, UTC_TIMESTAMP(3))
+         WHERE tenant_id = ? AND order_id = ? AND status IN ('HELD', 'CONSUMED')`,
+        [tenantId, orderId]
+      );
+      await connection.execute(
+        `UPDATE qipai_order_user_access
+         SET revoked_at = COALESCE(revoked_at, UTC_TIMESTAMP(3))
+         WHERE tenant_id = ? AND order_id = ?`,
+        [tenantId, orderId]
+      );
+    }
+  }
+
+  private async transaction<T>(work: (connection: PoolConnection) => Promise<T>) {
+    const connection = await this.pool.getConnection();
+    try {
+      await connection.beginTransaction();
+      const result = await work(connection);
+      await connection.commit();
+      return result;
+    } catch (error) {
+      await connection.rollback();
+      throw error;
+    } finally {
+      connection.release();
+    }
+  }
+}
+
+function canManageStore(access: AccessProfile, storeId: string) {
+  return access.capabilities.includes('tenant.manage')
+    || access.roles.includes('PLATFORM_ADMIN')
+    || (access.capabilities.includes('store.operation.write') && access.storeIds.includes(storeId));
+}
diff --git a/backend/src/orders/pricing-repository.ts b/backend/src/orders/pricing-repository.ts
index 36879a8..53db4d5 100644
--- a/backend/src/orders/pricing-repository.ts
+++ b/backend/src/orders/pricing-repository.ts
@@ -97,6 +97,14 @@ export class PricingRepository {
          VALUES (?, ?, ?)`,
         [input.tenantId, orderId, input.userId]
       );
+      await connection.execute(
+        `INSERT INTO qipai_order_status_history
+          (tenant_id, order_id, from_status, to_status, action, actor_type,
+           actor_id, source, reason, trace_id, metadata)
+         VALUES (?, ?, NULL, 'PENDING_PAYMENT', 'CREATED', 'USER', ?,
+           'APP', 'Room hold created', ?, JSON_OBJECT('statusVersion', 1))`,
+        [input.tenantId, orderId, input.userId, `order-created-${orderId}`]
+      );
       return {
         orderId,
         orderNo,
@@ -127,12 +135,26 @@ export class PricingRepository {
        WHERE ${filters.join(' AND ')}`,
       params
     );
+    await connection.execute<ResultSetHeader>(
+      `INSERT IGNORE INTO qipai_order_status_history
+        (tenant_id, order_id, from_status, to_status, action, actor_type,
+         actor_id, source, reason, trace_id, metadata)
+       SELECT o.tenant_id, o.id, o.status, 'CLOSED', 'EXPIRED', 'SYSTEM',
+              NULL, 'WORKER', 'Payment hold expired',
+              CONCAT('hold-expired-', o.id), JSON_OBJECT('statusVersion', o.status_version + 1)
+       FROM qipai_room_reservations r
+       INNER JOIN qipai_orders o
+         ON o.id = r.order_id AND o.tenant_id = r.tenant_id
+       WHERE ${filters.join(' AND ')}`,
+      params
+    );
     await connection.execute<ResultSetHeader>(
       `UPDATE qipai_room_reservations r
        INNER JOIN qipai_orders o
          ON o.id = r.order_id AND o.tenant_id = r.tenant_id
        SET r.status = 'RELEASED', r.released_at = UTC_TIMESTAMP(3),
-           o.status = 'CLOSED'
+           o.status = 'CLOSED', o.status_version = o.status_version + 1,
+           o.status_updated_at = UTC_TIMESTAMP(3)
        WHERE ${filters.join(' AND ')}`,
       params
     );
diff --git a/backend/src/routes/order-state.ts b/backend/src/routes/order-state.ts
new file mode 100644
index 0000000..4b20dbe
--- /dev/null
+++ b/backend/src/routes/order-state.ts
@@ -0,0 +1,118 @@
+import type { FastifyInstance, FastifyReply } from 'fastify';
+import { z } from 'zod';
+import type { AuthRepository } from '../auth/auth-repository.js';
+import { authenticateAccessToken } from '../auth/authenticate.js';
+import type { AccessProfile } from '../auth/rbac-repository.js';
+import {
+  OrderStateError, orderActions, type OrderStateRepository
+} from '../orders/order-state-repository.js';
+
+const paramsSchema = z.object({ orderId: z.string().regex(/^[1-9]\d{0,19}$/) });
+const transitionSchema = z.object({
+  action: z.enum(orderActions),
+  reason: z.string().max(512).default('')
+}).strict();
+const cancelSchema = z.object({ reason: z.string().max(512).default('') }).strict();
+
+export interface OrderStateRouteOptions {
+  repository: Pick<OrderStateRepository, 'transition' | 'history'>;
+  authRepository: Pick<AuthRepository, 'validateSession'>;
+  accessControl: { getAccessProfile(tenantId: string, userId: string): Promise<AccessProfile> };
+  jwtSecret: string;
+}
+
+export async function registerOrderStateRoutes(
+  app: FastifyInstance, options: OrderStateRouteOptions
+) {
+  app.get('/app-api/orders/:orderId/history', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    const params = paramsSchema.safeParse(request.params);
+    if (!auth) return unauthorized(reply, request.traceId);
+    if (!params.success) return invalid(reply, request.traceId);
+    return handle(reply, request.traceId, async () => ({
+      code: 0,
+      data: await options.repository.history(
+        auth.tenantId, auth.userId, params.data.orderId, auth.access
+      ),
+      traceId: request.traceId
+    }));
+  });
+
+  app.post('/app-api/orders/:orderId/cancel', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    const params = paramsSchema.safeParse(request.params);
+    const body = cancelSchema.safeParse(request.body ?? {});
+    if (!auth) return unauthorized(reply, request.traceId);
+    if (!params.success || !body.success) return invalid(reply, request.traceId);
+    return handle(reply, request.traceId, async () => ({
+      code: 0,
+      data: await options.repository.transition({
+        tenantId: auth.tenantId, userId: auth.userId, actorType: 'USER',
+        source: 'APP', traceId: request.traceId, ip: request.ip,
+        userAgent: request.headers['user-agent'] ?? '', access: auth.access
+      }, params.data.orderId, 'CANCEL', body.data.reason),
+      traceId: request.traceId
+    }));
+  });
+
+  app.post('/admin-api/orders/:orderId/actions', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    const params = paramsSchema.safeParse(request.params);
+    const body = transitionSchema.safeParse(request.body);
+    if (!auth) return unauthorized(reply, request.traceId);
+    if (!params.success || !body.success) return invalid(reply, request.traceId);
+    return handle(reply, request.traceId, async () => ({
+      code: 0,
+      data: await options.repository.transition({
+        tenantId: auth.tenantId, userId: auth.userId, actorType: 'USER',
+        source: 'ADMIN', traceId: request.traceId, ip: request.ip,
+        userAgent: request.headers['user-agent'] ?? '', access: auth.access
+      }, params.data.orderId, body.data.action, body.data.reason),
+      traceId: request.traceId
+    }));
+  });
+}
+
+async function authenticate(
+  authorization: string | undefined, options: OrderStateRouteOptions
+) {
+  const result = await authenticateAccessToken(
+    authorization, options.authRepository, options.jwtSecret
+  );
+  if (!result) return null;
+  const tenantId = result.session.tenantId;
+  const userId = result.session.user.id;
+  return {
+    tenantId,
+    userId,
+    access: await options.accessControl.getAccessProfile(tenantId, userId)
+  };
+}
+
+async function handle(reply: FastifyReply, traceId: string, work: () => Promise<unknown>) {
+  try {
+    return await work();
+  } catch (error) {
+    if (!(error instanceof OrderStateError)) throw error;
+    const status = error.code === 'ORDER_NOT_FOUND' ? 404
+      : error.code === 'ORDER_TRANSITION_NOT_ALLOWED' ? 409
+        : error.code.includes('FORBIDDEN') ? 403 : 400;
+    return reply.status(status).send({
+      code: error.code,
+      message: 'The requested order action is not available.',
+      traceId
+    });
+  }
+}
+
+function unauthorized(reply: FastifyReply, traceId: string) {
+  return reply.status(401).send({
+    code: 'AUTH_SESSION_INVALID', message: 'Authentication required.', traceId
+  });
+}
+
+function invalid(reply: FastifyReply, traceId: string) {
+  return reply.status(400).send({
+    code: 'INVALID_ORDER_ACTION', message: 'The order action is invalid.', traceId
+  });
+}
diff --git a/backend/src/server.ts b/backend/src/server.ts
index 095c8fe..6939b22 100644
--- a/backend/src/server.ts
+++ b/backend/src/server.ts
@@ -13,6 +13,7 @@ import { resolve } from 'node:path';
 import { StoreDiscoveryRepository } from './stores/store-discovery-repository.js';
 import { StoreAccessRepository } from './stores/access-repository.js';
 import { PricingRepository } from './orders/pricing-repository.js';
+import { OrderStateRepository } from './orders/order-state-repository.js';
 
 const config = loadConfig();
 const pool = createMySqlPool(config);
@@ -63,6 +64,12 @@ const app = await buildApp({
     authRepository,
     accessControl,
     jwtSecret: config.auth.jwtSecret
+  },
+  orderState: {
+    repository: new OrderStateRepository(pool),
+    authRepository,
+    accessControl,
+    jwtSecret: config.auth.jwtSecret
   }
 });
 app.addHook('onClose', async () => {
diff --git a/backend/src/stores/access-repository.ts b/backend/src/stores/access-repository.ts
index a08fc98..b02b32b 100644
--- a/backend/src/stores/access-repository.ts
+++ b/backend/src/stores/access-repository.ts
@@ -137,7 +137,8 @@ export class StoreAccessRepository {
          INNER JOIN qipai_orders o
            ON o.id = a.order_id AND o.tenant_id = a.tenant_id AND o.deleted_at IS NULL
          WHERE a.tenant_id = ? AND a.user_id = ? AND a.revoked_at IS NULL
-           AND o.store_id = ? AND o.status IN ('PAID', 'CONFIRMED', 'IN_USE')
+           AND o.store_id = ?
+           AND o.status IN ('PAID', 'RESERVED', 'IN_PROGRESS', 'CONFIRMED', 'IN_USE')
            AND UTC_TIMESTAMP(3) BETWEEN DATE_SUB(o.start_at, INTERVAL 30 MINUTE) AND o.end_at`,
         [input.tenantId, input.userId, input.storeId]
       );
diff --git a/backend/tests/migration-contract.test.mjs b/backend/tests/migration-contract.test.mjs
index e32bf24..b75c5c5 100644
--- a/backend/tests/migration-contract.test.mjs
+++ b/backend/tests/migration-contract.test.mjs
@@ -42,6 +42,9 @@ const accessVerifySql = read('database/migrations/2026061810_m03d_scene_wifi_acc
 const pricingUpSql = read('database/migrations/2026061811_m04a_pricing_reservations.up.sql');
 const pricingDownSql = read('database/migrations/2026061811_m04a_pricing_reservations.down.sql');
 const pricingVerifySql = read('database/migrations/2026061811_m04a_pricing_reservations.verify.sql');
+const orderStateUpSql = read('database/migrations/2026062012_m04b_order_state_machine.up.sql');
+const orderStateDownSql = read('database/migrations/2026062012_m04b_order_state_machine.down.sql');
+const orderStateVerifySql = read('database/migrations/2026062012_m04b_order_state_machine.verify.sql');
 
 const coreTables = [
   'qipai_schema_migrations',
@@ -196,5 +199,13 @@ for (const table of [
 assert.match(pricingUpSql, /full_day_price_cents/);
 assert.match(pricingUpSql, /minimum_spend_cents/);
 assert.match(pricingUpSql, /idx_qipai_reservation_overlap/);
+assert.match(orderStateUpSql, /CREATE TABLE IF NOT EXISTS qipai_order_status_history/);
+assert.match(orderStateDownSql, /DROP TABLE IF EXISTS qipai_order_status_history/);
+assert.match(orderStateVerifySql, /'qipai_order_status_history'/);
+assert.match(orderStateUpSql, /status_version INT UNSIGNED/);
+assert.match(orderStateUpSql, /UNIQUE KEY uq_qipai_order_history_trace/);
+assert.match(orderStateUpSql, /actor_type VARCHAR/);
+assert.match(orderStateUpSql, /source VARCHAR/);
+assert.match(orderStateUpSql, /trace_id VARCHAR/);
 
-console.log('PASS: M01-B through M04-A migration contracts are present.');
+console.log('PASS: M01-B through M04-B migration contracts are present.');
diff --git a/backend/tests/migration-runner.test.mjs b/backend/tests/migration-runner.test.mjs
index 73712fa..c0c6665 100644
--- a/backend/tests/migration-runner.test.mjs
+++ b/backend/tests/migration-runner.test.mjs
@@ -22,7 +22,8 @@ assert.match(plan.file, /2026061807_m03a_store_room_domain\.up\.sql/);
 assert.match(plan.file, /2026061808_m03b_decoration_ads_media\.up\.sql/);
 assert.match(plan.file, /2026061809_m03c_store_discovery\.up\.sql/);
 assert.match(plan.file, /2026061810_m03d_scene_wifi_access\.up\.sql/);
-assert.match(plan.file, /2026061811_m04a_pricing_reservations\.up\.sql$/);
+assert.match(plan.file, /2026061811_m04a_pricing_reservations\.up\.sql/);
+assert.match(plan.file, /2026062012_m04b_order_state_machine\.up\.sql$/);
 assert.match(plan.checksum, /^[a-f0-9]{64}$/);
 assert.ok(plan.statements.length >= 11);
 
diff --git a/backend/tests/mysql-migration-roundtrip.test.mjs b/backend/tests/mysql-migration-roundtrip.test.mjs
index 1d0403c..5f38aa3 100644
--- a/backend/tests/mysql-migration-roundtrip.test.mjs
+++ b/backend/tests/mysql-migration-roundtrip.test.mjs
@@ -18,6 +18,9 @@ import { ContentRepository, ContentError } from '../dist/content/content-reposit
 import { StoreDiscoveryRepository } from '../dist/stores/store-discovery-repository.js';
 import { StoreAccessRepository, StoreAccessError } from '../dist/stores/access-repository.js';
 import { PricingRepository, PricingError } from '../dist/orders/pricing-repository.js';
+import {
+  OrderStateError, OrderStateRepository
+} from '../dist/orders/order-state-repository.js';
 import {
   executeMigrationPlan,
   loadMigrationPlan,
@@ -35,6 +38,7 @@ const expectedTables = [
   'qipai_media_assets',
   'qipai_members',
   'qipai_order_price_snapshots',
+  'qipai_order_status_history',
   'qipai_order_user_access',
   'qipai_orders',
   'qipai_outbox_events',
@@ -81,11 +85,11 @@ async function readMigrationVersions(pool) {
   const [rows] = await pool.query(
     `SELECT version, name
      FROM qipai_schema_migrations
-     WHERE version IN (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+     WHERE version IN (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
      ORDER BY version`,
     ['2026061601', '2026061802', '2026061803', '2026061804',
       '2026061805', '2026061806', '2026061807', '2026061808', '2026061809',
-      '2026061810', '2026061811']
+      '2026061810', '2026061811', '2026062012']
   );
   return rows;
 }
@@ -627,6 +631,98 @@ async function assertPricingAndReservations(pool, context) {
   assert.equal(replacement.quote.unitPriceCents, 9000);
 }
 
+async function assertOrderStateMachine(pool, context) {
+  const [adminRows] = await pool.query(
+    `SELECT u.id FROM qipai_users u
+     INNER JOIN qipai_user_roles ur ON ur.tenant_id = u.tenant_id AND ur.user_id = u.id
+     INNER JOIN qipai_roles r ON r.id = ur.role_id AND r.tenant_id = ur.tenant_id
+     WHERE u.tenant_id = ? AND r.code = 'TENANT_ADMIN' LIMIT 1`,
+    [context.tenantId]
+  );
+  const [customerRows] = await pool.query(
+    `SELECT u.id FROM qipai_users u
+     INNER JOIN qipai_user_identities i
+       ON i.tenant_id = u.tenant_id AND i.user_id = u.id
+     WHERE u.tenant_id = ? AND i.openid = 'm02b-openid-a' LIMIT 1`,
+    [context.tenantId]
+  );
+  const [targetRows] = await pool.query(
+    `SELECT r.id AS roomId
+     FROM qipai_rooms r
+     INNER JOIN qipai_stores s ON s.id = r.store_id AND s.tenant_id = r.tenant_id
+     WHERE r.tenant_id = ? AND s.name = 'M03A Store' LIMIT 1`,
+    [context.tenantId]
+  );
+  const adminId = String(adminRows[0].id);
+  const customerId = String(customerRows[0].id);
+  const roomId = String(targetRows[0].roomId);
+  const startAt = new Date(Date.now() + 15 * 86400000);
+  startAt.setUTCHours(2, 0, 0, 0);
+  const endAt = new Date(startAt.getTime() + 2 * 3600000);
+  const order = await new PricingRepository(pool).reserve({
+    tenantId: context.tenantId, userId: customerId, roomId,
+    startAt, endAt, pricingMode: 'HOURLY'
+  });
+  const access = await new RbacRepository(pool).getAccessProfile(context.tenantId, adminId);
+  const repository = new OrderStateRepository(pool);
+  const actor = (traceId) => ({
+    tenantId: context.tenantId, userId: adminId, actorType: 'USER',
+    source: 'ADMIN', traceId, ip: '127.0.0.1',
+    userAgent: 'M04-B live state test', access
+  });
+
+  const paid = await repository.transition(
+    actor('m04b-paid'), order.orderId, 'CONFIRM_PAYMENT', 'payment accepted'
+  );
+  assert.equal(paid.status, 'PAID');
+  assert.equal(paid.statusVersion, 2);
+  const duplicate = await repository.transition(
+    actor('m04b-paid'), order.orderId, 'CONFIRM_PAYMENT', 'duplicate callback'
+  );
+  assert.equal(duplicate.idempotent, true);
+  await repository.transition(actor('m04b-reserved'), order.orderId, 'RESERVE');
+  await repository.transition(actor('m04b-start'), order.orderId, 'START');
+  await repository.transition(actor('m04b-finish'), order.orderId, 'FINISH');
+  const closed = await repository.transition(actor('m04b-close'), order.orderId, 'CLOSE');
+  assert.equal(closed.status, 'CLOSED');
+  assert.equal(closed.statusVersion, 6);
+  await assert.rejects(
+    () => repository.transition(actor('m04b-invalid'), order.orderId, 'START'),
+    (error) => error instanceof OrderStateError
+      && error.code === 'ORDER_TRANSITION_NOT_ALLOWED'
+  );
+  const history = await repository.history(context.tenantId, customerId, order.orderId, {
+    roles: ['CUSTOMER'], capabilities: ['order.self.read'], storeIds: []
+  });
+  assert.deepEqual(history.map((item) => item.toStatus), [
+    'PENDING_PAYMENT', 'PAID', 'RESERVED', 'IN_PROGRESS', 'FINISHED', 'CLOSED'
+  ]);
+  const [stateRows] = await pool.query(
+    `SELECT o.status, o.status_version AS statusVersion,
+            r.status AS reservationStatus, a.revoked_at AS revokedAt
+     FROM qipai_orders o
+     INNER JOIN qipai_room_reservations r
+       ON r.tenant_id = o.tenant_id AND r.order_id = o.id
+     INNER JOIN qipai_order_user_access a
+       ON a.tenant_id = o.tenant_id AND a.order_id = o.id AND a.user_id = ?
+     WHERE o.tenant_id = ? AND o.id = ?`,
+    [customerId, context.tenantId, order.orderId]
+  );
+  assert.equal(stateRows[0].status, 'CLOSED');
+  assert.equal(stateRows[0].statusVersion, 6);
+  assert.equal(stateRows[0].reservationStatus, 'RELEASED');
+  assert.ok(stateRows[0].revokedAt);
+  const [auditRows] = await pool.query(
+    `SELECT action FROM qipai_audit_logs
+     WHERE tenant_id = ? AND trace_id LIKE 'm04b-%' ORDER BY id`,
+    [context.tenantId]
+  );
+  assert.deepEqual(auditRows.map((row) => row.action), [
+    'ORDER_STATUS_CHANGED', 'ORDER_STATUS_CHANGED', 'ORDER_STATUS_CHANGED',
+    'ORDER_STATUS_CHANGED', 'ORDER_STATUS_CHANGED'
+  ]);
+}
+
 async function assertContentManagement(pool, context) {
   const [adminRows] = await pool.query(
     `SELECT u.id FROM qipai_users u
@@ -725,7 +821,8 @@ try {
     { version: '2026061808', name: 'm03b_decoration_ads_media' },
     { version: '2026061809', name: 'm03c_store_discovery' },
     { version: '2026061810', name: 'm03d_scene_wifi_access' },
-    { version: '2026061811', name: 'm04a_pricing_reservations' }
+    { version: '2026061811', name: 'm04a_pricing_reservations' },
+    { version: '2026062012', name: 'm04b_order_state_machine' }
   ]);
   await assertTaskDurability(pool);
   const loginContext = await assertPlatformTenantIsolation(pool);
@@ -736,13 +833,14 @@ try {
   await assertStoreDiscovery(pool, loginContext);
   await assertSceneAndWifiAccess(pool, loginContext);
   await assertPricingAndReservations(pool, loginContext);
+  await assertOrderStateMachine(pool, loginContext);
   await assertLegacyCompatibility(pool);
   console.log('PASS: first up, verify, tenant isolation and revocable auth checks completed.');
 
   await executeMigrationPlan(pool, plans.down);
   assert.deepEqual(await readCoreTables(pool), []);
   await assertLegacyCompatibility(pool);
-  console.log('PASS: down removed all M01-B through M04-A tables.');
+  console.log('PASS: down removed all M01-B through M04-B tables.');
 
   await executeMigrationPlan(pool, plans.up);
   await executeMigrationPlan(pool, plans.verify);
@@ -758,7 +856,8 @@ try {
     { version: '2026061808', name: 'm03b_decoration_ads_media' },
     { version: '2026061809', name: 'm03c_store_discovery' },
     { version: '2026061810', name: 'm03d_scene_wifi_access' },
-    { version: '2026061811', name: 'm04a_pricing_reservations' }
+    { version: '2026061811', name: 'm04a_pricing_reservations' },
+    { version: '2026062012', name: 'm04b_order_state_machine' }
   ]);
   await assertLegacyCompatibility(pool);
   console.log('PASS: second up and verify restored the schema.');
@@ -816,7 +915,11 @@ try {
       'holiday and minimum-spend pricing',
       'immutable order price snapshot',
       'concurrent room hold conflict',
-      'expired hold release'
+      'expired hold release',
+      'controlled order actions',
+      'idempotent transition trace',
+      'complete order status history',
+      'reservation and access release on close'
     ]
   }, null, 2));
 } finally {
diff --git a/backend/tests/order-state.test.mjs b/backend/tests/order-state.test.mjs
new file mode 100644
index 0000000..fed0336
--- /dev/null
+++ b/backend/tests/order-state.test.mjs
@@ -0,0 +1,75 @@
+import assert from 'node:assert/strict';
+import { buildApp } from '../dist/app.js';
+import { signAccessToken } from '../dist/auth/jwt.js';
+
+const secret = 'test-only-order-state-jwt-secret-32-chars';
+const token = signAccessToken({
+  sub: '21', sid: '5c4d3af8-c63c-4edb-bf95-b84127bb3f6e',
+  tid: '7', aid: '9', rv: 1
+}, secret, 900);
+let transitionInput;
+const options = {
+  jwtSecret: secret,
+  authRepository: {
+    async validateSession() {
+      return {
+        id: '5c4d3af8-c63c-4edb-bf95-b84127bb3f6e',
+        tenantId: '7', platformAppId: '9',
+        expiresAt: new Date(Date.now() + 60000),
+        user: {
+          id: '21', tenantId: '7', userType: 'ADMIN', status: 'ACTIVE',
+          roleVersion: 1, nickname: '', avatarUrl: '', phone: ''
+        }
+      };
+    }
+  },
+  accessControl: {
+    async getAccessProfile() {
+      return { roles: ['TENANT_ADMIN'], capabilities: ['tenant.manage'], storeIds: [] };
+    }
+  },
+  repository: {
+    async transition(actor, orderId, action, reason) {
+      transitionInput = { actor, orderId, action, reason };
+      return { orderId, status: action === 'CANCEL' ? 'CANCELLED' : 'PAID' };
+    },
+    async history() { return []; }
+  }
+};
+const app = await buildApp({ orderState: options });
+
+const rejectedTarget = await app.inject({
+  method: 'POST',
+  url: '/admin-api/orders/31/actions',
+  headers: { authorization: `Bearer ${token}` },
+  payload: { action: 'CONFIRM_PAYMENT', targetStatus: 'FINISHED' }
+});
+assert.equal(rejectedTarget.statusCode, 400);
+
+const transitioned = await app.inject({
+  method: 'POST',
+  url: '/admin-api/orders/31/actions',
+  headers: {
+    authorization: `Bearer ${token}`,
+    'x-trace-id': 'm04b-route-transition'
+  },
+  payload: { action: 'CONFIRM_PAYMENT', reason: 'sanitized callback rehearsal' }
+});
+assert.equal(transitioned.statusCode, 200);
+assert.equal(transitionInput.orderId, '31');
+assert.equal(transitionInput.action, 'CONFIRM_PAYMENT');
+assert.equal(transitionInput.actor.source, 'ADMIN');
+assert.equal(transitionInput.actor.traceId, 'm04b-route-transition');
+
+const cancelled = await app.inject({
+  method: 'POST',
+  url: '/app-api/orders/31/cancel',
+  headers: { authorization: `Bearer ${token}` },
+  payload: { reason: 'customer changed plans' }
+});
+assert.equal(cancelled.statusCode, 200);
+assert.equal(transitionInput.action, 'CANCEL');
+assert.equal(transitionInput.actor.source, 'APP');
+
+await app.close();
+console.log('PASS: M04-B routes accept business actions and reject direct target statuses.');
diff --git a/database/migrations/2026062012_m04b_order_state_machine.down.sql b/database/migrations/2026062012_m04b_order_state_machine.down.sql
new file mode 100644
index 0000000..e0e50cf
--- /dev/null
+++ b/database/migrations/2026062012_m04b_order_state_machine.down.sql
@@ -0,0 +1,5 @@
+DELETE FROM qipai_schema_migrations WHERE version = '2026062012';
+DROP TABLE IF EXISTS qipai_order_status_history;
+ALTER TABLE qipai_orders
+  DROP COLUMN status_updated_at,
+  DROP COLUMN status_version;
diff --git a/database/migrations/2026062012_m04b_order_state_machine.up.sql b/database/migrations/2026062012_m04b_order_state_machine.up.sql
new file mode 100644
index 0000000..fe0e249
--- /dev/null
+++ b/database/migrations/2026062012_m04b_order_state_machine.up.sql
@@ -0,0 +1,38 @@
+ALTER TABLE qipai_orders
+  ADD COLUMN status_version INT UNSIGNED NOT NULL DEFAULT 1 AFTER status,
+  ADD COLUMN status_updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3)
+    AFTER status_version;
+
+CREATE TABLE IF NOT EXISTS qipai_order_status_history (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  order_id BIGINT UNSIGNED NOT NULL,
+  from_status VARCHAR(32) NULL,
+  to_status VARCHAR(32) NOT NULL,
+  action VARCHAR(32) NOT NULL,
+  actor_type VARCHAR(32) NOT NULL,
+  actor_id BIGINT UNSIGNED NULL,
+  source VARCHAR(32) NOT NULL,
+  reason VARCHAR(512) NOT NULL DEFAULT '',
+  trace_id VARCHAR(128) NOT NULL,
+  metadata JSON NOT NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  CONSTRAINT fk_qipai_order_history_tenant
+    FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_order_history_order
+    FOREIGN KEY (order_id) REFERENCES qipai_orders(id),
+  UNIQUE KEY uq_qipai_order_history_trace (tenant_id, order_id, trace_id),
+  KEY idx_qipai_order_history_order (tenant_id, order_id, id),
+  KEY idx_qipai_order_history_status (tenant_id, to_status, created_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO qipai_order_status_history
+  (tenant_id, order_id, from_status, to_status, action, actor_type,
+   actor_id, source, reason, trace_id, metadata, created_at)
+SELECT tenant_id, id, NULL, status, 'MIGRATED', 'SYSTEM',
+       NULL, 'MIGRATION', 'M04-B baseline history',
+       CONCAT('m04b-migration-', id), JSON_OBJECT('statusVersion', 1), created_at
+FROM qipai_orders;
+
+INSERT IGNORE INTO qipai_schema_migrations (version, name)
+VALUES ('2026062012', 'm04b_order_state_machine');
diff --git a/database/migrations/2026062012_m04b_order_state_machine.verify.sql b/database/migrations/2026062012_m04b_order_state_machine.verify.sql
new file mode 100644
index 0000000..8bfe92c
--- /dev/null
+++ b/database/migrations/2026062012_m04b_order_state_machine.verify.sql
@@ -0,0 +1,20 @@
+SELECT column_name FROM information_schema.columns
+WHERE table_schema = DATABASE() AND table_name = 'qipai_orders'
+  AND column_name IN ('status_version', 'status_updated_at')
+ORDER BY column_name;
+
+SELECT table_name FROM information_schema.tables
+WHERE table_schema = DATABASE()
+  AND table_name = 'qipai_order_status_history';
+
+SELECT index_name FROM information_schema.statistics
+WHERE table_schema = DATABASE()
+  AND table_name = 'qipai_order_status_history'
+  AND index_name IN (
+    'uq_qipai_order_history_trace',
+    'idx_qipai_order_history_order',
+    'idx_qipai_order_history_status'
+  )
+GROUP BY index_name ORDER BY index_name;
+
+SELECT version, name FROM qipai_schema_migrations WHERE version = '2026062012';
diff --git a/docs/api-changelog/2026-06-20-M04-B-order-state-machine.md b/docs/api-changelog/2026-06-20-M04-B-order-state-machine.md
new file mode 100644
index 0000000..37585ec
--- /dev/null
+++ b/docs/api-changelog/2026-06-20-M04-B-order-state-machine.md
@@ -0,0 +1,9 @@
+# M04-B 订单状态机 API
+
+- `GET /app-api/orders/:orderId/history`：订单所有者或有门店管理权限的人员查看完整状态历史。
+- `POST /app-api/orders/:orderId/cancel`：订单所有者发起取消。
+- `POST /admin-api/orders/:orderId/actions`：管理员提交受控业务动作。
+
+管理接口只接受 `SUBMIT`、`CONFIRM_PAYMENT`、`RESERVE`、`START`、`FINISH`、`CANCEL`、`BEGIN_REFUND`、`COMPLETE_REFUND`、`CLOSE`，由服务端映射目标状态并校验合法迁移。请求不能直接提交目标状态或最终金额。
+
+每次迁移记录操作者、来源、原因和 traceId；相同订单和 traceId 的重试幂等返回第一次结果。
diff --git a/docs/db-changelog/2026-06-20-M04-B-order-state-machine.md b/docs/db-changelog/2026-06-20-M04-B-order-state-machine.md
new file mode 100644
index 0000000..2ea0732
--- /dev/null
+++ b/docs/db-changelog/2026-06-20-M04-B-order-state-machine.md
@@ -0,0 +1,9 @@
+# M04-B 订单状态机数据库变更
+
+- 迁移版本：`2026062012`
+- `qipai_orders` 新增 `status_version` 和 `status_updated_at`。
+- 新增 `qipai_order_status_history`，保存旧状态、新状态、业务动作、操作者、来源、原因、traceId 和版本元数据。
+- `(tenant_id, order_id, trace_id)` 唯一约束用于状态迁移幂等。
+- 已有订单在迁移时补一条 `MIGRATED` 基线历史。
+
+状态迁移与房间预占、订单现场访问授权更新处于同一数据库事务。进入已支付/已预留/使用中时消费预占；取消、退款完成或关闭时释放预占并撤销现场权限。
diff --git a/scripts/dev/windows/check-backend.ps1 b/scripts/dev/windows/check-backend.ps1
index 726737c..9d62849 100644
--- a/scripts/dev/windows/check-backend.ps1
+++ b/scripts/dev/windows/check-backend.ps1
@@ -49,6 +49,9 @@ $requiredFiles = @(
   "database/migrations/2026061805_m02c_rbac.up.sql",
   "database/migrations/2026061805_m02c_rbac.down.sql",
   "database/migrations/2026061805_m02c_rbac.verify.sql",
+  "database/migrations/2026062012_m04b_order_state_machine.up.sql",
+  "database/migrations/2026062012_m04b_order_state_machine.down.sql",
+  "database/migrations/2026062012_m04b_order_state_machine.verify.sql",
   "database/seeds/2026061601_m01b_minimal_seed.sql",
   "deploy/pm2/ecosystem.config.cjs"
 )
diff --git a/scripts/dev/wsl/mysql-migration-roundtrip.sh b/scripts/dev/wsl/mysql-migration-roundtrip.sh
index fb8cef1..31692cd 100644
--- a/scripts/dev/wsl/mysql-migration-roundtrip.sh
+++ b/scripts/dev/wsl/mysql-migration-roundtrip.sh
@@ -93,6 +93,6 @@ export QIPAI_MYSQL_USER="${username}"
 export QIPAI_MYSQL_PASSWORD="${password}"
 export QIPAI_MYSQL_CONNECTION_LIMIT=2
 
-echo "INFO: MySQL ${mysql_version}; running M01-B through M04-A migration roundtrip in a temporary database."
+echo "INFO: MySQL ${mysql_version}; running M01-B through M04-B migration roundtrip in a temporary database."
 npm --prefix backend run test:mysql:migration
-echo "PASS: M01-B through M04-A live MySQL migration roundtrip completed."
+echo "PASS: M01-B through M04-B live MySQL migration roundtrip completed."