diff --git a/backend/package.json b/backend/package.json
index 171c654..5b35e94 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"
+    "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"
   },
   "dependencies": {
     "@fastify/cors": "^11.2.0",
diff --git a/backend/src/app.ts b/backend/src/app.ts
index 3472bb8..3f4e3e7 100644
--- a/backend/src/app.ts
+++ b/backend/src/app.ts
@@ -29,6 +29,7 @@ import {
   registerStoreAccessRoutes,
   type StoreAccessRouteOptions
 } from './routes/store-access.js';
+import { registerPricingRoutes, type PricingRouteOptions } from './routes/pricing.js';
 
 export interface BuildAppOptions {
   config?: AppConfig;
@@ -39,6 +40,7 @@ export interface BuildAppOptions {
   content?: ContentRouteOptions;
   storeDiscovery?: StoreDiscoveryRouteOptions;
   storeAccess?: StoreAccessRouteOptions;
+  pricing?: PricingRouteOptions;
 }
 
 declare module 'fastify' {
@@ -102,6 +104,9 @@ export async function buildApp(options: BuildAppOptions = {}): Promise<FastifyIn
   if (options.storeAccess) {
     await registerStoreAccessRoutes(app, options.storeAccess);
   }
+  if (options.pricing) {
+    await registerPricingRoutes(app, options.pricing);
+  }
 
   return app;
 }
diff --git a/backend/src/db/migration-runner.ts b/backend/src/db/migration-runner.ts
index cafd0cc..d914522 100644
--- a/backend/src/db/migration-runner.ts
+++ b/backend/src/db/migration-runner.ts
@@ -30,7 +30,8 @@ const migrationFiles: Record<MigrationDirection, readonly string[]> = {
     'database/migrations/2026061807_m03a_store_room_domain.up.sql',
     '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/2026061810_m03d_scene_wifi_access.up.sql',
+    'database/migrations/2026061811_m04a_pricing_reservations.up.sql'
   ],
   verify: [
     'database/migrations/2026061601_m01b_core_schema.verify.sql',
@@ -42,9 +43,11 @@ const migrationFiles: Record<MigrationDirection, readonly string[]> = {
     'database/migrations/2026061807_m03a_store_room_domain.verify.sql',
     '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/2026061810_m03d_scene_wifi_access.verify.sql',
+    'database/migrations/2026061811_m04a_pricing_reservations.verify.sql'
   ],
   down: [
+    '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',
     'database/migrations/2026061808_m03b_decoration_ads_media.down.sql',
@@ -180,7 +183,8 @@ export async function executeMigrationPlan(
         3, 6, 13, 1,
         3, 3, 1,
         2, 2, 1,
-        3, 3, 1
+        3, 3, 1,
+        2, 1, 3, 3, 1
       ][index] ?? 1;
       if (!Array.isArray(result) || result.length < minimumRows) {
         throw new Error(
diff --git a/backend/src/orders/pricing-repository.ts b/backend/src/orders/pricing-repository.ts
new file mode 100644
index 0000000..36879a8
--- /dev/null
+++ b/backend/src/orders/pricing-repository.ts
@@ -0,0 +1,307 @@
+import { randomBytes } from 'node:crypto';
+import type { PoolConnection, ResultSetHeader, RowDataPacket } from 'mysql2/promise';
+import type { MySqlPool } from '../db/mysql.js';
+
+export type PricingMode = 'HOURLY' | 'OVERNIGHT' | 'FULL_DAY';
+
+export interface PricingAdjustment {
+  discountCents?: number;
+  packageCreditCents?: number;
+}
+
+export interface QuoteInput {
+  tenantId: string;
+  roomId: string;
+  startAt: Date;
+  endAt: Date;
+  pricingMode: PricingMode;
+  adjustment?: PricingAdjustment;
+}
+
+interface RoomPricingRow extends RowDataPacket {
+  id: string;
+  storeId: string;
+  timezone: string;
+  configurationStatus: string;
+  operationalStatus: string;
+  basePriceCents: number;
+  weekdayPriceCents: number;
+  holidayPriceCents: number;
+  overnightPriceCents: number;
+  fullDayPriceCents: number;
+  minimumSpendCents: number;
+  depositCents: number;
+  minimumMinutes: number;
+  maxAdvanceDays: number;
+}
+interface CountRow extends RowDataPacket { total: number }
+
+export class PricingError extends Error {
+  constructor(public readonly code: string) { super(code); }
+}
+
+export class PricingRepository {
+  constructor(private readonly pool: MySqlPool) {}
+
+  async quote(input: QuoteInput) {
+    const room = await this.loadRoom(this.pool, input.tenantId, input.roomId);
+    await this.releaseExpired(input.tenantId, input.roomId);
+    await this.assertAvailable(this.pool, input, false);
+    const isHoliday = await this.isHoliday(this.pool, input.tenantId, input.startAt, room.timezone);
+    return this.calculate(room, input, isHoliday);
+  }
+
+  async reserve(input: QuoteInput & {
+    userId: string;
+    holdMinutes?: number;
+  }) {
+    return this.transaction(async (connection) => {
+      const room = await this.loadRoom(connection, input.tenantId, input.roomId, true);
+      await this.releaseExpired(input.tenantId, input.roomId, connection);
+      await this.assertAvailable(connection, input, true);
+      const isHoliday = await this.isHoliday(
+        connection, input.tenantId, input.startAt, room.timezone
+      );
+      const quote = this.calculate(room, input, isHoliday);
+      const holdMinutes = Math.min(Math.max(input.holdMinutes ?? 15, 5), 30);
+      const orderNo = `QP${Date.now()}${randomBytes(4).toString('hex').toUpperCase()}`;
+      const [orderResult] = await connection.execute<ResultSetHeader>(
+        `INSERT INTO qipai_orders
+          (tenant_id, store_id, room_id, order_no, status, start_at, end_at,
+           hold_expires_at, total_amount_cents)
+         VALUES (?, ?, ?, ?, 'PENDING_PAYMENT', ?, ?,
+           DATE_ADD(UTC_TIMESTAMP(3), INTERVAL ? MINUTE), ?)`,
+        [input.tenantId, room.storeId, input.roomId, orderNo, input.startAt, input.endAt,
+          holdMinutes, quote.totalCents]
+      );
+      const orderId = String(orderResult.insertId);
+      await connection.execute(
+        `INSERT INTO qipai_order_price_snapshots
+          (tenant_id, order_id, pricing_mode, duration_minutes, unit_price_cents,
+           subtotal_cents, minimum_spend_cents, deposit_cents, discount_cents,
+           package_credit_cents, total_cents, rules)
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+        [input.tenantId, orderId, input.pricingMode, quote.durationMinutes,
+          quote.unitPriceCents, quote.subtotalCents, quote.minimumSpendCents,
+          quote.depositCents, quote.discountCents, quote.packageCreditCents,
+          quote.totalCents, JSON.stringify(quote.rules)]
+      );
+      const [reservationResult] = await connection.execute<ResultSetHeader>(
+        `INSERT INTO qipai_room_reservations
+          (tenant_id, order_id, room_id, starts_at, ends_at, expires_at)
+         VALUES (?, ?, ?, ?, ?, DATE_ADD(UTC_TIMESTAMP(3), INTERVAL ? MINUTE))`,
+        [input.tenantId, orderId, input.roomId, input.startAt, input.endAt, holdMinutes]
+      );
+      await connection.execute(
+        `INSERT INTO qipai_order_user_access (tenant_id, order_id, user_id)
+         VALUES (?, ?, ?)`,
+        [input.tenantId, orderId, input.userId]
+      );
+      return {
+        orderId,
+        orderNo,
+        reservationId: String(reservationResult.insertId),
+        holdMinutes,
+        quote
+      };
+    });
+  }
+
+  async releaseExpired(
+    tenantId?: string,
+    roomId?: string,
+    connection: Pick<MySqlPool, 'execute'> | PoolConnection = this.pool
+  ) {
+    const filters = [`r.status = 'HELD'`, 'r.expires_at <= UTC_TIMESTAMP(3)'];
+    const params: string[] = [];
+    if (tenantId) {
+      filters.push('r.tenant_id = ?');
+      params.push(tenantId);
+    }
+    if (roomId) {
+      filters.push('r.room_id = ?');
+      params.push(roomId);
+    }
+    const [counts] = await connection.execute<CountRow[]>(
+      `SELECT COUNT(*) AS total FROM qipai_room_reservations r
+       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'
+       WHERE ${filters.join(' AND ')}`,
+      params
+    );
+    return { released: Number(counts[0]?.total ?? 0) };
+  }
+
+  private calculate(room: RoomPricingRow, input: QuoteInput, isHoliday: boolean) {
+    this.validateWindow(room, input);
+    const durationMinutes = Math.ceil(
+      (input.endAt.getTime() - input.startAt.getTime()) / 60000
+    );
+    const localDate = localDateKey(input.startAt, room.timezone);
+    const weekday = localWeekday(input.startAt, room.timezone);
+    const adjustment = input.adjustment ?? {};
+    let unitPriceCents = room.basePriceCents;
+    let priceSource = 'base';
+    if (input.pricingMode === 'OVERNIGHT') {
+      unitPriceCents = room.overnightPriceCents || room.basePriceCents;
+      priceSource = 'overnight';
+    } else if (input.pricingMode === 'FULL_DAY') {
+      unitPriceCents = room.fullDayPriceCents || room.basePriceCents * 24;
+      priceSource = 'fullDay';
+    } else if (isHoliday && room.holidayPriceCents > 0) {
+      unitPriceCents = room.holidayPriceCents;
+      priceSource = 'holiday';
+    } else if (weekday >= 1 && weekday <= 5 && room.weekdayPriceCents > 0) {
+      unitPriceCents = room.weekdayPriceCents;
+      priceSource = 'weekday';
+    }
+    const subtotalCents = input.pricingMode === 'HOURLY'
+      ? Math.ceil(durationMinutes / 60) * unitPriceCents
+      : unitPriceCents;
+    const minimumSpendCents = room.minimumSpendCents;
+    const billableCents = Math.max(subtotalCents, minimumSpendCents);
+    const discountCents = clampAdjustment(adjustment.discountCents, billableCents);
+    const afterDiscount = billableCents - discountCents;
+    const packageCreditCents = clampAdjustment(
+      adjustment.packageCreditCents, afterDiscount
+    );
+    const totalCents = afterDiscount - packageCreditCents + room.depositCents;
+    return {
+      durationMinutes,
+      unitPriceCents,
+      subtotalCents,
+      minimumSpendCents,
+      depositCents: room.depositCents,
+      discountCents,
+      packageCreditCents,
+      totalCents,
+      rules: {
+        priceSource,
+        isHoliday,
+        localDate,
+        timezone: room.timezone,
+        pricingMode: input.pricingMode,
+        minimumMinutes: room.minimumMinutes
+      }
+    };
+  }
+
+  private validateWindow(room: RoomPricingRow, input: QuoteInput) {
+    if (input.endAt <= input.startAt) throw new PricingError('INVALID_TIME_WINDOW');
+    const durationMinutes = (input.endAt.getTime() - input.startAt.getTime()) / 60000;
+    if (durationMinutes < room.minimumMinutes) throw new PricingError('MINIMUM_DURATION_NOT_MET');
+    if (input.startAt.getTime() > Date.now() + room.maxAdvanceDays * 86400000) {
+      throw new PricingError('ADVANCE_WINDOW_EXCEEDED');
+    }
+    if (room.configurationStatus !== 'ENABLED' || room.operationalStatus !== 'AVAILABLE') {
+      throw new PricingError('ROOM_NOT_AVAILABLE');
+    }
+  }
+
+  private async loadRoom(
+    connection: Pick<MySqlPool, 'execute'> | PoolConnection,
+    tenantId: string,
+    roomId: string,
+    lock = false
+  ) {
+    const [rows] = await connection.execute<RoomPricingRow[]>(
+      `SELECT r.id, r.store_id AS storeId, s.timezone,
+              r.configuration_status AS configurationStatus,
+              r.operational_status AS operationalStatus,
+              r.base_price_cents AS basePriceCents,
+              r.weekday_price_cents AS weekdayPriceCents,
+              r.holiday_price_cents AS holidayPriceCents,
+              r.overnight_price_cents AS overnightPriceCents,
+              r.full_day_price_cents AS fullDayPriceCents,
+              r.minimum_spend_cents AS minimumSpendCents,
+              r.deposit_cents AS depositCents,
+              r.minimum_minutes AS minimumMinutes,
+              r.max_advance_days AS maxAdvanceDays
+       FROM qipai_rooms r
+       INNER JOIN qipai_stores s
+         ON s.id = r.store_id AND s.tenant_id = r.tenant_id AND s.deleted_at IS NULL
+       WHERE r.tenant_id = ? AND r.id = ? AND r.deleted_at IS NULL
+       ${lock ? 'FOR UPDATE' : ''}`,
+      [tenantId, roomId]
+    );
+    if (!rows[0]) throw new PricingError('ROOM_NOT_FOUND');
+    return rows[0];
+  }
+
+  private async assertAvailable(
+    connection: Pick<MySqlPool, 'execute'> | PoolConnection,
+    input: QuoteInput,
+    lock: boolean
+  ) {
+    const [disabled] = await connection.execute<CountRow[]>(
+      `SELECT COUNT(*) AS total FROM qipai_room_disabled_periods
+       WHERE tenant_id = ? AND room_id = ? AND starts_at < ? AND ends_at > ?`,
+      [input.tenantId, input.roomId, input.endAt, input.startAt]
+    );
+    if (Number(disabled[0]?.total ?? 0) > 0) throw new PricingError('ROOM_DISABLED_PERIOD');
+    const [reserved] = await connection.execute<CountRow[]>(
+      `SELECT COUNT(*) AS total FROM qipai_room_reservations
+       WHERE tenant_id = ? AND room_id = ?
+         AND status IN ('HELD', 'CONSUMED')
+         AND (status = 'CONSUMED' OR expires_at > UTC_TIMESTAMP(3))
+         AND starts_at < ? AND ends_at > ?
+       ${lock ? 'FOR UPDATE' : ''}`,
+      [input.tenantId, input.roomId, input.endAt, input.startAt]
+    );
+    if (Number(reserved[0]?.total ?? 0) > 0) throw new PricingError('TIME_SLOT_CONFLICT');
+  }
+
+  private async isHoliday(
+    connection: Pick<MySqlPool, 'execute'> | PoolConnection,
+    tenantId: string,
+    date: Date,
+    timezone: string
+  ) {
+    const [rows] = await connection.execute<CountRow[]>(
+      `SELECT COUNT(*) AS total FROM qipai_holiday_calendar
+       WHERE tenant_id = ? AND holiday_date = ?`,
+      [tenantId, localDateKey(date, timezone)]
+    );
+    return Number(rows[0]?.total ?? 0) > 0;
+  }
+
+  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 clampAdjustment(value: number | undefined, maximum: number) {
+  if (!value || value < 0) return 0;
+  return Math.min(Math.trunc(value), maximum);
+}
+
+function localDateKey(date: Date, timezone: string) {
+  return new Intl.DateTimeFormat('en-CA', {
+    timeZone: timezone, year: 'numeric', month: '2-digit', day: '2-digit'
+  }).format(date);
+}
+
+function localWeekday(date: Date, timezone: string) {
+  const day = new Intl.DateTimeFormat('en-US', {
+    timeZone: timezone, weekday: 'short'
+  }).format(date);
+  return ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'].indexOf(day);
+}
diff --git a/backend/src/routes/pricing.ts b/backend/src/routes/pricing.ts
new file mode 100644
index 0000000..3e0b3fb
--- /dev/null
+++ b/backend/src/routes/pricing.ts
@@ -0,0 +1,117 @@
+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 { PricingError, type PricingRepository } from '../orders/pricing-repository.js';
+
+const requestSchema = z.object({
+  roomId: z.string().regex(/^[1-9]\d{0,19}$/),
+  startAt: z.coerce.date(),
+  endAt: z.coerce.date(),
+  pricingMode: z.enum(['HOURLY', 'OVERNIGHT', 'FULL_DAY']).default('HOURLY')
+}).refine((value) => value.endAt > value.startAt);
+
+export interface PricingRouteOptions {
+  repository: Pick<PricingRepository, 'quote' | 'reserve' | 'releaseExpired'>;
+  authRepository: Pick<AuthRepository, 'validateSession'>;
+  accessControl: { getAccessProfile(tenantId: string, userId: string): Promise<AccessProfile> };
+  jwtSecret: string;
+}
+
+export async function registerPricingRoutes(app: FastifyInstance, options: PricingRouteOptions) {
+  app.post('/app-api/pricing/quote', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    const body = requestSchema.safeParse(request.body);
+    if (!auth) return unauthorized(reply, request.traceId);
+    if (!body.success) return invalid(reply, request.traceId);
+    return handle(reply, request.traceId, async () => ({
+      code: 0,
+      data: await options.repository.quote({
+        tenantId: auth.tenantId,
+        ...body.data
+      }),
+      traceId: request.traceId
+    }));
+  });
+
+  app.post('/app-api/orders/reserve', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    const body = requestSchema.safeParse(request.body);
+    if (!auth) return unauthorized(reply, request.traceId);
+    if (!body.success) return invalid(reply, request.traceId);
+    return handle(reply, request.traceId, async () => reply.status(201).send({
+      code: 0,
+      data: await options.repository.reserve({
+        tenantId: auth.tenantId,
+        userId: auth.userId,
+        ...body.data
+      }),
+      traceId: request.traceId
+    }));
+  });
+
+  app.post('/admin-api/reservations/release-expired', async (request, reply) => {
+    const auth = await authenticate(request.headers.authorization, options);
+    if (!auth) return unauthorized(reply, request.traceId);
+    const access = await options.accessControl.getAccessProfile(auth.tenantId, auth.userId);
+    if (!access.capabilities.includes('tenant.manage')
+        && !access.roles.includes('PLATFORM_ADMIN')) {
+      return reply.status(403).send({
+        code: 'RESERVATION_RELEASE_FORBIDDEN',
+        message: 'Tenant management permission is required.',
+        traceId: request.traceId
+      });
+    }
+    return {
+      code: 0,
+      data: await options.repository.releaseExpired(auth.tenantId),
+      traceId: request.traceId
+    };
+  });
+}
+
+async function authenticate(
+  authorization: string | undefined,
+  options: PricingRouteOptions
+) {
+  const result = await authenticateAccessToken(
+    authorization, options.authRepository, options.jwtSecret
+  );
+  if (!result) return null;
+  return {
+    tenantId: result.session.tenantId,
+    userId: result.session.user.id
+  };
+}
+
+async function handle(reply: FastifyReply, traceId: string, work: () => Promise<unknown>) {
+  try {
+    return await work();
+  } catch (error) {
+    if (!(error instanceof PricingError)) throw error;
+    const conflict = error.code === 'TIME_SLOT_CONFLICT';
+    const notFound = error.code === 'ROOM_NOT_FOUND';
+    return reply.status(conflict ? 409 : notFound ? 404 : 400).send({
+      code: error.code,
+      message: 'The requested price or time slot 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_PRICING_REQUEST',
+    message: 'The pricing request is invalid.',
+    traceId
+  });
+}
diff --git a/backend/src/routes/store-room-management.ts b/backend/src/routes/store-room-management.ts
index 7f872d3..33a040a 100644
--- a/backend/src/routes/store-room-management.ts
+++ b/backend/src/routes/store-room-management.ts
@@ -44,6 +44,8 @@ const roomSchema = z.object({
   weekdayPriceCents: z.number().int().min(0).max(10000000),
   holidayPriceCents: z.number().int().min(0).max(10000000),
   overnightPriceCents: z.number().int().min(0).max(10000000),
+  fullDayPriceCents: z.number().int().min(0).max(10000000).default(0),
+  minimumSpendCents: z.number().int().min(0).max(10000000).default(0),
   depositCents: z.number().int().min(0).max(10000000),
   minimumMinutes: z.number().int().min(15).max(1440),
   maxAdvanceStartMinutes: z.number().int().min(0).max(1440),
diff --git a/backend/src/server.ts b/backend/src/server.ts
index 96360e8..095c8fe 100644
--- a/backend/src/server.ts
+++ b/backend/src/server.ts
@@ -12,6 +12,7 @@ import { MediaStorage } from './content/media-storage.js';
 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';
 
 const config = loadConfig();
 const pool = createMySqlPool(config);
@@ -56,6 +57,12 @@ const app = await buildApp({
     authRepository,
     accessControl,
     jwtSecret: config.auth.jwtSecret
+  },
+  pricing: {
+    repository: new PricingRepository(pool),
+    authRepository,
+    accessControl,
+    jwtSecret: config.auth.jwtSecret
   }
 });
 app.addHook('onClose', async () => {
diff --git a/backend/src/stores/store-room-repository.ts b/backend/src/stores/store-room-repository.ts
index 274ffcf..8888ea3 100644
--- a/backend/src/stores/store-room-repository.ts
+++ b/backend/src/stores/store-room-repository.ts
@@ -34,6 +34,8 @@ export interface RoomInput {
   weekdayPriceCents: number;
   holidayPriceCents: number;
   overnightPriceCents: number;
+  fullDayPriceCents: number;
+  minimumSpendCents: number;
   depositCents: number;
   minimumMinutes: number;
   maxAdvanceStartMinutes: number;
@@ -56,7 +58,8 @@ interface StoreRow extends RowDataPacket {
 interface RoomRow extends RowDataPacket {
   id: string; storeId: string; categoryName: string; name: string; roomNo: string; capacity: number;
   basePriceCents: number; weekdayPriceCents: number; holidayPriceCents: number;
-  overnightPriceCents: number; depositCents: number; minimumMinutes: number;
+  overnightPriceCents: number; fullDayPriceCents: number; minimumSpendCents: number;
+  depositCents: number; minimumMinutes: number;
   maxAdvanceStartMinutes: number; maxAdvanceDays: number; configurationStatus: string;
   operationalStatus: string; tags: string | string[] | null; images: string | string[] | null;
   sortOrder: number;
@@ -155,7 +158,10 @@ export class StoreRoomRepository {
               r.name, r.room_no AS roomNo, r.capacity,
               r.base_price_cents AS basePriceCents, r.weekday_price_cents AS weekdayPriceCents,
               r.holiday_price_cents AS holidayPriceCents,
-              r.overnight_price_cents AS overnightPriceCents, r.deposit_cents AS depositCents,
+              r.overnight_price_cents AS overnightPriceCents,
+              r.full_day_price_cents AS fullDayPriceCents,
+              r.minimum_spend_cents AS minimumSpendCents,
+              r.deposit_cents AS depositCents,
               r.minimum_minutes AS minimumMinutes,
               r.max_advance_start_minutes AS maxAdvanceStartMinutes,
               r.max_advance_days AS maxAdvanceDays,
@@ -185,10 +191,11 @@ export class StoreRoomRepository {
       const [result] = await connection.execute<ResultSetHeader>(
         `INSERT INTO qipai_rooms
           (tenant_id, store_id, category_id, name, room_no, capacity, base_price_cents,
-           weekday_price_cents, holiday_price_cents, overnight_price_cents, deposit_cents,
-           minimum_minutes, max_advance_start_minutes, max_advance_days,
+           weekday_price_cents, holiday_price_cents, overnight_price_cents,
+           full_day_price_cents, minimum_spend_cents, deposit_cents, minimum_minutes,
+           max_advance_start_minutes, max_advance_days,
            configuration_status, operational_status, tags, images, sort_order, status)
-         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+         VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
         roomParams(actor.tenantId, categoryId, input)
       );
       const roomId = String(result.insertId);
@@ -207,7 +214,8 @@ export class StoreRoomRepository {
       await connection.execute(
         `UPDATE qipai_rooms SET category_id = ?, name = ?, room_no = ?, capacity = ?,
           base_price_cents = ?, weekday_price_cents = ?, holiday_price_cents = ?,
-          overnight_price_cents = ?, deposit_cents = ?, minimum_minutes = ?,
+          overnight_price_cents = ?, full_day_price_cents = ?, minimum_spend_cents = ?,
+          deposit_cents = ?, minimum_minutes = ?,
           max_advance_start_minutes = ?, max_advance_days = ?, configuration_status = ?,
           operational_status = ?, tags = ?, images = ?, sort_order = ?, status = ?
          WHERE tenant_id = ? AND store_id = ? AND id = ?`,
@@ -369,7 +377,8 @@ function roomParams(tenantId: string, categoryId: string, input: RoomInput) {
   return [
     tenantId, input.storeId, categoryId, input.name, input.roomNo, input.capacity,
     input.basePriceCents, input.weekdayPriceCents, input.holidayPriceCents,
-    input.overnightPriceCents, input.depositCents, input.minimumMinutes,
+    input.overnightPriceCents, input.fullDayPriceCents ?? 0, input.minimumSpendCents ?? 0,
+    input.depositCents, input.minimumMinutes,
     input.maxAdvanceStartMinutes, input.maxAdvanceDays, input.configurationStatus,
     input.operationalStatus, JSON.stringify(input.tags), JSON.stringify(input.images),
     input.sortOrder, legacyStatus
@@ -382,7 +391,8 @@ function roomUpdateParams(categoryId: string, input: RoomInput) {
   return [
     categoryId, input.name, input.roomNo, input.capacity, input.basePriceCents,
     input.weekdayPriceCents, input.holidayPriceCents, input.overnightPriceCents,
-    input.depositCents, input.minimumMinutes, input.maxAdvanceStartMinutes,
+    input.fullDayPriceCents ?? 0, input.minimumSpendCents ?? 0, input.depositCents,
+    input.minimumMinutes, input.maxAdvanceStartMinutes,
     input.maxAdvanceDays, input.configurationStatus, input.operationalStatus,
     JSON.stringify(input.tags), JSON.stringify(input.images), input.sortOrder, legacyStatus
   ];
diff --git a/backend/tests/migration-contract.test.mjs b/backend/tests/migration-contract.test.mjs
index 8c68053..e32bf24 100644
--- a/backend/tests/migration-contract.test.mjs
+++ b/backend/tests/migration-contract.test.mjs
@@ -39,6 +39,9 @@ const discoveryVerifySql = read('database/migrations/2026061809_m03c_store_disco
 const accessUpSql = read('database/migrations/2026061810_m03d_scene_wifi_access.up.sql');
 const accessDownSql = read('database/migrations/2026061810_m03d_scene_wifi_access.down.sql');
 const accessVerifySql = read('database/migrations/2026061810_m03d_scene_wifi_access.verify.sql');
+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 coreTables = [
   'qipai_schema_migrations',
@@ -183,5 +186,15 @@ for (const table of [
 assert.match(accessUpSql, /scan_count BIGINT UNSIGNED/);
 assert.match(accessUpSql, /target_type = 'STORE'/);
 assert.match(accessUpSql, /PRIMARY KEY \(tenant_id, order_id, user_id\)/);
+for (const table of [
+  'qipai_holiday_calendar', 'qipai_order_price_snapshots', 'qipai_room_reservations'
+]) {
+  assert.match(pricingUpSql, new RegExp(`CREATE TABLE IF NOT EXISTS ${table}`));
+  assert.match(pricingDownSql, new RegExp(`DROP TABLE IF EXISTS ${table}`));
+  assert.match(pricingVerifySql, new RegExp(`'${table}'`));
+}
+assert.match(pricingUpSql, /full_day_price_cents/);
+assert.match(pricingUpSql, /minimum_spend_cents/);
+assert.match(pricingUpSql, /idx_qipai_reservation_overlap/);
 
-console.log('PASS: M01-B through M03-D migration contracts are present.');
+console.log('PASS: M01-B through M04-A migration contracts are present.');
diff --git a/backend/tests/migration-runner.test.mjs b/backend/tests/migration-runner.test.mjs
index 2d91f95..73712fa 100644
--- a/backend/tests/migration-runner.test.mjs
+++ b/backend/tests/migration-runner.test.mjs
@@ -21,7 +21,8 @@ assert.match(plan.file, /2026061806_m02d_user_management\.up\.sql/);
 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$/);
+assert.match(plan.file, /2026061810_m03d_scene_wifi_access\.up\.sql/);
+assert.match(plan.file, /2026061811_m04a_pricing_reservations\.up\.sql$/);
 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 cc39de0..1d0403c 100644
--- a/backend/tests/mysql-migration-roundtrip.test.mjs
+++ b/backend/tests/mysql-migration-roundtrip.test.mjs
@@ -17,6 +17,7 @@ import { StoreRoomRepository, StoreRoomError } from '../dist/stores/store-room-r
 import { ContentRepository, ContentError } from '../dist/content/content-repository.js';
 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 {
   executeMigrationPlan,
   loadMigrationPlan,
@@ -29,9 +30,11 @@ const expectedTables = [
   'qipai_audit_logs',
   'qipai_auth_sessions',
   'qipai_devices',
+  'qipai_holiday_calendar',
   'qipai_legacy_table_mappings',
   'qipai_media_assets',
   'qipai_members',
+  'qipai_order_price_snapshots',
   'qipai_order_user_access',
   'qipai_orders',
   'qipai_outbox_events',
@@ -42,6 +45,7 @@ const expectedTables = [
   'qipai_roles',
   'qipai_room_categories',
   'qipai_room_disabled_periods',
+  'qipai_room_reservations',
   'qipai_rooms',
   'qipai_scene_codes',
   'qipai_scene_scan_events',
@@ -77,11 +81,11 @@ 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']
+      '2026061810', '2026061811']
   );
   return rows;
 }
@@ -527,6 +531,102 @@ async function assertSceneAndWifiAccess(pool, context) {
   assert.doesNotMatch(auditRows[0].metadata, /sanitized-password/);
 }
 
+async function assertPricingAndReservations(pool, context) {
+  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 s.id AS storeId, r.id AS roomId
+     FROM qipai_stores s
+     INNER JOIN qipai_rooms r ON r.tenant_id = s.tenant_id AND r.store_id = s.id
+     WHERE s.tenant_id = ? AND s.name = 'M03A Store' LIMIT 1`,
+    [context.tenantId]
+  );
+  const customerId = String(customerRows[0].id);
+  const roomId = String(targetRows[0].roomId);
+  await pool.query(
+    `UPDATE qipai_rooms SET base_price_cents = 1200, weekday_price_cents = 1000,
+       holiday_price_cents = 1800, overnight_price_cents = 5000,
+       full_day_price_cents = 9000, minimum_spend_cents = 2500,
+       deposit_cents = 500, minimum_minutes = 60, max_advance_days = 30,
+       configuration_status = 'ENABLED', operational_status = 'AVAILABLE'
+     WHERE tenant_id = ? AND id = ?`,
+    [context.tenantId, roomId]
+  );
+  const startAt = new Date(Date.now() + 5 * 86400000);
+  startAt.setUTCHours(2, 0, 0, 0);
+  const endAt = new Date(startAt.getTime() + 2 * 3600000);
+  const holidayDate = new Intl.DateTimeFormat('en-CA', {
+    timeZone: 'Asia/Shanghai', year: 'numeric', month: '2-digit', day: '2-digit'
+  }).format(startAt);
+  await pool.query(
+    `INSERT INTO qipai_holiday_calendar (tenant_id, holiday_date, name)
+     VALUES (?, ?, 'M04-A Test Holiday')`,
+    [context.tenantId, holidayDate]
+  );
+  const repository = new PricingRepository(pool);
+  const quote = await repository.quote({
+    tenantId: context.tenantId,
+    roomId,
+    startAt,
+    endAt,
+    pricingMode: 'HOURLY',
+    adjustment: { discountCents: 300, packageCreditCents: 200 }
+  });
+  assert.equal(quote.rules.priceSource, 'holiday');
+  assert.equal(quote.subtotalCents, 3600);
+  assert.equal(quote.totalCents, 3600);
+
+  const attempts = await Promise.allSettled([
+    repository.reserve({
+      tenantId: context.tenantId, userId: customerId, roomId,
+      startAt, endAt, pricingMode: 'HOURLY'
+    }),
+    repository.reserve({
+      tenantId: context.tenantId, userId: customerId, roomId,
+      startAt, endAt, pricingMode: 'HOURLY'
+    })
+  ]);
+  assert.equal(attempts.filter((item) => item.status === 'fulfilled').length, 1);
+  assert.equal(attempts.filter((item) =>
+    item.status === 'rejected'
+      && item.reason instanceof PricingError
+      && item.reason.code === 'TIME_SLOT_CONFLICT'
+  ).length, 1);
+  const first = attempts.find((item) => item.status === 'fulfilled').value;
+  const [snapshotBefore] = await pool.query(
+    `SELECT total_cents AS totalCents, rules
+     FROM qipai_order_price_snapshots WHERE tenant_id = ? AND order_id = ?`,
+    [context.tenantId, first.orderId]
+  );
+  await pool.query(
+    `UPDATE qipai_rooms SET holiday_price_cents = 9900
+     WHERE tenant_id = ? AND id = ?`,
+    [context.tenantId, roomId]
+  );
+  const [snapshotAfter] = await pool.query(
+    `SELECT total_cents AS totalCents, rules
+     FROM qipai_order_price_snapshots WHERE tenant_id = ? AND order_id = ?`,
+    [context.tenantId, first.orderId]
+  );
+  assert.deepEqual(snapshotAfter, snapshotBefore);
+  await pool.query(
+    `UPDATE qipai_room_reservations SET expires_at = DATE_SUB(UTC_TIMESTAMP(3), INTERVAL 1 SECOND)
+     WHERE tenant_id = ? AND order_id = ?`,
+    [context.tenantId, first.orderId]
+  );
+  assert.equal((await repository.releaseExpired(context.tenantId, roomId)).released, 1);
+  const replacement = await repository.reserve({
+    tenantId: context.tenantId, userId: customerId, roomId,
+    startAt, endAt, pricingMode: 'FULL_DAY'
+  });
+  assert.equal(replacement.quote.unitPriceCents, 9000);
+}
+
 async function assertContentManagement(pool, context) {
   const [adminRows] = await pool.query(
     `SELECT u.id FROM qipai_users u
@@ -624,7 +724,8 @@ try {
     { version: '2026061807', name: 'm03a_store_room_domain' },
     { version: '2026061808', name: 'm03b_decoration_ads_media' },
     { version: '2026061809', name: 'm03c_store_discovery' },
-    { version: '2026061810', name: 'm03d_scene_wifi_access' }
+    { version: '2026061810', name: 'm03d_scene_wifi_access' },
+    { version: '2026061811', name: 'm04a_pricing_reservations' }
   ]);
   await assertTaskDurability(pool);
   const loginContext = await assertPlatformTenantIsolation(pool);
@@ -634,13 +735,14 @@ try {
   await assertContentManagement(pool, loginContext);
   await assertStoreDiscovery(pool, loginContext);
   await assertSceneAndWifiAccess(pool, loginContext);
+  await assertPricingAndReservations(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/M01-C tables.');
+  console.log('PASS: down removed all M01-B through M04-A tables.');
 
   await executeMigrationPlan(pool, plans.up);
   await executeMigrationPlan(pool, plans.verify);
@@ -655,7 +757,8 @@ try {
     { version: '2026061807', name: 'm03a_store_room_domain' },
     { version: '2026061808', name: 'm03b_decoration_ads_media' },
     { version: '2026061809', name: 'm03c_store_discovery' },
-    { version: '2026061810', name: 'm03d_scene_wifi_access' }
+    { version: '2026061810', name: 'm03d_scene_wifi_access' },
+    { version: '2026061811', name: 'm04a_pricing_reservations' }
   ]);
   await assertLegacyCompatibility(pool);
   console.log('PASS: second up and verify restored the schema.');
@@ -709,7 +812,11 @@ try {
       'scene scan statistics',
       'Wi-Fi denied without active order',
       'Wi-Fi allowed by active order grant',
-      'Wi-Fi audit excludes password'
+      'Wi-Fi audit excludes password',
+      'holiday and minimum-spend pricing',
+      'immutable order price snapshot',
+      'concurrent room hold conflict',
+      'expired hold release'
     ]
   }, null, 2));
 } finally {
diff --git a/backend/tests/pricing.test.mjs b/backend/tests/pricing.test.mjs
new file mode 100644
index 0000000..944389a
--- /dev/null
+++ b/backend/tests/pricing.test.mjs
@@ -0,0 +1,90 @@
+import assert from 'node:assert/strict';
+import { buildApp } from '../dist/app.js';
+import { signAccessToken } from '../dist/auth/jwt.js';
+
+const secret = 'test-only-pricing-jwt-secret-with-32-characters';
+const token = signAccessToken({
+  sub: '21',
+  sid: '5c4d3af8-c63c-4edb-bf95-b84127bb3f6e',
+  tid: '7',
+  aid: '9',
+  rv: 1
+}, secret, 900);
+let reserveInput;
+const app = await buildApp({
+  pricing: {
+    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: 'CUSTOMER',
+            status: 'ACTIVE',
+            roleVersion: 1,
+            nickname: '',
+            avatarUrl: '',
+            phone: ''
+          }
+        };
+      }
+    },
+    accessControl: {
+      async getAccessProfile() {
+        return { roles: ['CUSTOMER'], capabilities: [], storeIds: [] };
+      }
+    },
+    repository: {
+      async quote() {
+        return { totalCents: 2500, depositCents: 500 };
+      },
+      async reserve(input) {
+        reserveInput = input;
+        return { orderId: '31', reservationId: '41', quote: { totalCents: 2500 } };
+      },
+      async releaseExpired() {
+        return { released: 0 };
+      }
+    }
+  }
+});
+
+const startAt = new Date(Date.now() + 3600000);
+const endAt = new Date(startAt.getTime() + 7200000);
+const reserved = await app.inject({
+  method: 'POST',
+  url: '/app-api/orders/reserve',
+  headers: { authorization: `Bearer ${token}` },
+  payload: {
+    roomId: '11',
+    startAt: startAt.toISOString(),
+    endAt: endAt.toISOString(),
+    pricingMode: 'HOURLY',
+    totalCents: 1,
+    discountCents: 999999
+  }
+});
+assert.equal(reserved.statusCode, 201);
+assert.equal(reserveInput.tenantId, '7');
+assert.equal(reserveInput.userId, '21');
+assert.equal('totalCents' in reserveInput, false);
+assert.equal('discountCents' in reserveInput, false);
+
+const unauthenticated = await app.inject({
+  method: 'POST',
+  url: '/app-api/pricing/quote',
+  payload: {
+    roomId: '11',
+    startAt: startAt.toISOString(),
+    endAt: endAt.toISOString()
+  }
+});
+assert.equal(unauthenticated.statusCode, 401);
+await app.close();
+
+console.log('PASS: M04-A pricing routes ignore client totals and require an authenticated session.');
diff --git a/database/migrations/2026061811_m04a_pricing_reservations.down.sql b/database/migrations/2026061811_m04a_pricing_reservations.down.sql
new file mode 100644
index 0000000..d79ac43
--- /dev/null
+++ b/database/migrations/2026061811_m04a_pricing_reservations.down.sql
@@ -0,0 +1,8 @@
+DELETE FROM qipai_schema_migrations WHERE version = '2026061811';
+DROP TABLE IF EXISTS qipai_room_reservations;
+DROP TABLE IF EXISTS qipai_order_price_snapshots;
+DROP TABLE IF EXISTS qipai_holiday_calendar;
+ALTER TABLE qipai_orders DROP COLUMN hold_expires_at;
+ALTER TABLE qipai_rooms
+  DROP COLUMN minimum_spend_cents,
+  DROP COLUMN full_day_price_cents;
diff --git a/database/migrations/2026061811_m04a_pricing_reservations.up.sql b/database/migrations/2026061811_m04a_pricing_reservations.up.sql
new file mode 100644
index 0000000..c41333d
--- /dev/null
+++ b/database/migrations/2026061811_m04a_pricing_reservations.up.sql
@@ -0,0 +1,60 @@
+ALTER TABLE qipai_rooms
+  ADD COLUMN full_day_price_cents INT UNSIGNED NOT NULL DEFAULT 0 AFTER overnight_price_cents,
+  ADD COLUMN minimum_spend_cents INT UNSIGNED NOT NULL DEFAULT 0 AFTER full_day_price_cents;
+
+ALTER TABLE qipai_orders
+  ADD COLUMN hold_expires_at DATETIME(3) NULL AFTER end_at;
+
+CREATE TABLE IF NOT EXISTS qipai_holiday_calendar (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  holiday_date DATE NOT NULL,
+  name VARCHAR(128) NOT NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  CONSTRAINT fk_qipai_holiday_tenant FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  UNIQUE KEY uq_qipai_holiday_date (tenant_id, holiday_date)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS qipai_order_price_snapshots (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  order_id BIGINT UNSIGNED NOT NULL,
+  currency CHAR(3) NOT NULL DEFAULT 'CNY',
+  pricing_mode VARCHAR(16) NOT NULL,
+  duration_minutes INT UNSIGNED NOT NULL,
+  unit_price_cents INT UNSIGNED NOT NULL,
+  subtotal_cents INT UNSIGNED NOT NULL,
+  minimum_spend_cents INT UNSIGNED NOT NULL DEFAULT 0,
+  deposit_cents INT UNSIGNED NOT NULL DEFAULT 0,
+  discount_cents INT UNSIGNED NOT NULL DEFAULT 0,
+  package_credit_cents INT UNSIGNED NOT NULL DEFAULT 0,
+  total_cents INT UNSIGNED NOT NULL,
+  rules JSON NOT NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  CONSTRAINT fk_qipai_price_snapshot_tenant FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_price_snapshot_order FOREIGN KEY (order_id) REFERENCES qipai_orders(id),
+  UNIQUE KEY uq_qipai_price_snapshot_order (tenant_id, order_id)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+CREATE TABLE IF NOT EXISTS qipai_room_reservations (
+  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  tenant_id BIGINT UNSIGNED NOT NULL,
+  order_id BIGINT UNSIGNED NOT NULL,
+  room_id BIGINT UNSIGNED NOT NULL,
+  starts_at DATETIME(3) NOT NULL,
+  ends_at DATETIME(3) NOT NULL,
+  status VARCHAR(16) NOT NULL DEFAULT 'HELD',
+  expires_at DATETIME(3) NOT NULL,
+  released_at DATETIME(3) NULL,
+  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+  CONSTRAINT fk_qipai_reservation_tenant FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
+  CONSTRAINT fk_qipai_reservation_order FOREIGN KEY (order_id) REFERENCES qipai_orders(id),
+  CONSTRAINT fk_qipai_reservation_room FOREIGN KEY (room_id) REFERENCES qipai_rooms(id),
+  UNIQUE KEY uq_qipai_reservation_order (tenant_id, order_id),
+  KEY idx_qipai_reservation_overlap (tenant_id, room_id, status, starts_at, ends_at),
+  KEY idx_qipai_reservation_expiry (status, expires_at),
+  CONSTRAINT chk_qipai_reservation_window CHECK (ends_at > starts_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+INSERT IGNORE INTO qipai_schema_migrations (version, name)
+VALUES ('2026061811', 'm04a_pricing_reservations');
diff --git a/database/migrations/2026061811_m04a_pricing_reservations.verify.sql b/database/migrations/2026061811_m04a_pricing_reservations.verify.sql
new file mode 100644
index 0000000..32f71c2
--- /dev/null
+++ b/database/migrations/2026061811_m04a_pricing_reservations.verify.sql
@@ -0,0 +1,27 @@
+SELECT column_name FROM information_schema.columns
+WHERE table_schema = DATABASE() AND table_name = 'qipai_rooms'
+  AND column_name IN ('full_day_price_cents', 'minimum_spend_cents')
+ORDER BY column_name;
+
+SELECT column_name FROM information_schema.columns
+WHERE table_schema = DATABASE() AND table_name = 'qipai_orders'
+  AND column_name = 'hold_expires_at';
+
+SELECT table_name FROM information_schema.tables
+WHERE table_schema = DATABASE()
+  AND table_name IN (
+    'qipai_holiday_calendar',
+    'qipai_order_price_snapshots',
+    'qipai_room_reservations'
+  )
+ORDER BY table_name;
+
+SELECT table_name, index_name FROM information_schema.statistics
+WHERE table_schema = DATABASE()
+  AND ((table_name = 'qipai_order_price_snapshots'
+      AND index_name = 'uq_qipai_price_snapshot_order')
+    OR (table_name = 'qipai_room_reservations'
+      AND index_name IN ('idx_qipai_reservation_overlap', 'idx_qipai_reservation_expiry')))
+GROUP BY table_name, index_name ORDER BY table_name, index_name;
+
+SELECT version, name FROM qipai_schema_migrations WHERE version = '2026061811';
diff --git a/docs/api-changelog/2026-06-18-M04-A-pricing-reservations.md b/docs/api-changelog/2026-06-18-M04-A-pricing-reservations.md
new file mode 100644
index 0000000..942e2fc
--- /dev/null
+++ b/docs/api-changelog/2026-06-18-M04-A-pricing-reservations.md
@@ -0,0 +1,7 @@
+# M04-A 定价与时段预占 API
+
+- `POST /app-api/pricing/quote`：按房间配置、节假日和定价模式返回服务端报价。
+- `POST /app-api/orders/reserve`：事务内锁定房间、检查重叠并创建待支付订单、价格快照和限时预占。
+- `POST /admin-api/reservations/release-expired`：租户管理员释放已过期待支付预占。
+
+客户端提交的最终金额、折扣或套餐抵扣字段会被忽略。优惠和套餐抵扣只允许后续 M05 的可信服务端权益模块传入定价引擎。
diff --git a/docs/db-changelog/2026-06-18-M04-A-pricing-reservations.md b/docs/db-changelog/2026-06-18-M04-A-pricing-reservations.md
new file mode 100644
index 0000000..c2ffbf2
--- /dev/null
+++ b/docs/db-changelog/2026-06-18-M04-A-pricing-reservations.md
@@ -0,0 +1,10 @@
+# M04-A 定价与预占数据库变更
+
+- 迁移版本：`2026061811`
+- 房间新增包场价和最低消费。
+- 订单新增预占过期时间。
+- `qipai_holiday_calendar`：租户节假日日历。
+- `qipai_order_price_snapshots`：不可变订单价格快照。
+- `qipai_room_reservations`：房间时段预占、过期和释放状态。
+
+并发控制使用事务锁定房间行，再检查重叠预占；不引入 Redis。
diff --git a/docs/devlogs/2026-06-18-M04-A-定价与时段预占.md b/docs/devlogs/2026-06-18-M04-A-定价与时段预占.md
new file mode 100644
index 0000000..166c25d
--- /dev/null
+++ b/docs/devlogs/2026-06-18-M04-A-定价与时段预占.md
@@ -0,0 +1,27 @@
+# M04-A 定价引擎和可用性
+
+- 日期：2026-06-18
+- 起始 commit：`6be7fa7`
+- 工程 commit：本阶段工程提交
+- ENGINEERING_DELTA=YES
+- 子阶段状态：待 push 与远端校验
+
+## 工程增量
+
+- 统一小时、工作日、节假日、通宵和包场定价。
+- 支持最低消费、押金及可信服务端优惠/套餐抵扣。
+- 创建订单时保存独立价格快照。
+- 房间行锁串行化并发预占，事务内检查重叠。
+- 待支付预占带过期时间，报价、预占和管理入口均可释放过期占位。
+- 客户端最终金额、优惠和套餐字段不进入定价输入。
+
+## 验证
+
+- Windows 后端全量测试通过。
+- WSL MySQL 8.4.9 往返迁移通过。
+- 迁移语句：up 56、verify 37、down 53。
+- 实测节假日/最低消费定价、历史快照不变、同房同时段并发仅一个成功、过期释放后可重新预占。
+
+## 后续
+
+M04-B 建立完整订单状态机、状态迁移历史和来源/原因审计。
diff --git a/scripts/dev/wsl/mysql-migration-roundtrip.sh b/scripts/dev/wsl/mysql-migration-roundtrip.sh
index 1b9d7a2..fb8cef1 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 M03-D migration roundtrip in a temporary database."
+echo "INFO: MySQL ${mysql_version}; running M01-B through M04-A migration roundtrip in a temporary database."
 npm --prefix backend run test:mysql:migration
-echo "PASS: M01-B through M03-D live MySQL migration roundtrip completed."
+echo "PASS: M01-B through M04-A live MySQL migration roundtrip completed."