refactor(dto): centralize backend schema defaults

src/data/dto/chat/__tests__/unlock_private_response.test.ts

@@ -104,4 +104,22 @@ describe("UnlockPrivateResponse", () => {
     expect(response.requiredCredits).toBe(0);
     expect(response.shortfallCredits).toBe(0);
   });
+
+  it("defaults nullable lock detail through schema helpers", () => {
+    const response = UnlockPrivateResponse.from({
+      unlocked: false,
+      content: "",
+      reason: "insufficient_balance",
+      lockDetail: null,
+    });
+
+    expect(response.lockDetail).toEqual({
+      locked: false,
+      showContent: true,
+      showUpgrade: false,
+      reason: null,
+      hint: null,
+      detail: null,
+    });
+  });
 });

src/data/dto/user/__tests__/user.test.ts

@@ -76,6 +76,22 @@ describe("User", () => {
     expect("dailyQuotas" in user.toJson()).toBe(false);
   });
 
+  it("defaults nullable nested user fields through schema helpers", () => {
+    const user = User.fromJson({
+      id: "user-1",
+      username: "guest_user",
+      personalityTraits: null,
+    });
+
+    expect(user.personalityTraits.toJson()).toEqual({
+      caring: 0.5,
+      playful: 0.5,
+      serious: 0.5,
+      cheerful: 0.5,
+      romantic: 0.5,
+    });
+  });
+
   it("parses the latest backend entitlements payload", () => {
     const entitlements = UserEntitlements.fromJson({
       userId: "user-1",
@@ -122,4 +138,29 @@ describe("User", () => {
     expect(entitlements.creditBalance).toBe(120);
     expect(entitlements.historyUnlock.costs.photo).toBe(40);
   });
+
+  it("defaults nullable entitlement sections through schema helpers", () => {
+    const entitlements = UserEntitlements.fromJson({
+      userId: "user-1",
+      policy: null,
+      costs: null,
+      quotas: null,
+      historyUnlock: null,
+    });
+
+    expect(entitlements.policy.membershipState).toBe("");
+    expect(entitlements.costs.private_message).toBe(0);
+    expect(entitlements.quotas.normalChatFreeDaily).toBe(0);
+    expect(entitlements.historyUnlock).toMatchObject({
+      enabled: false,
+      order: "",
+      chargeMode: "",
+      insufficientBalanceBehavior: "",
+      costs: {
+        private_message: 0,
+        voice_message: 0,
+        photo: 0,
+      },
+    });
+  });
 });

src/data/schemas/auth/apple_login_request.ts

@@ -4,10 +4,12 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse } from "../nullable-defaults";
+
 export const AppleLoginRequestSchema = z.object({
   identityToken: z.string(),
   platform: z.string(),
-  isTestAccount: z.boolean().default(false),
+  isTestAccount: booleanOrFalse,
 });
 
 export type AppleLoginRequestInput = z.input<typeof AppleLoginRequestSchema>;

src/data/schemas/auth/facebook_login_request.ts

@@ -4,11 +4,13 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrEmpty } from "../nullable-defaults";
+
 export const FacebookLoginRequestSchema = z.object({
   accessToken: z.string(),
   platform: z.string(),
-  guestId: z.string().default(""),
-  isTestAccount: z.boolean().default(false),
+  guestId: stringOrEmpty,
+  isTestAccount: booleanOrFalse,
 });
 
 export type FacebookLoginRequestInput = z.input<typeof FacebookLoginRequestSchema>;

src/data/schemas/auth/facebook_user_data.ts

@@ -6,11 +6,13 @@
  */
 import { z } from "zod";
 
+import { stringOrNull } from "../nullable-defaults";
+
 export const FacebookUserDataSchema = z.object({
-  id: z.string().nullable().default(null),
-  name: z.string().nullable().default(null),
-  email: z.string().nullable().default(null),
-  pictureUrl: z.string().nullable().default(null),
+  id: stringOrNull,
+  name: stringOrNull,
+  email: stringOrNull,
+  pictureUrl: stringOrNull,
 });
 
 export type FacebookUserDataInput = z.input<typeof FacebookUserDataSchema>;

src/data/schemas/auth/fb_id_login_request.ts

@@ -4,10 +4,12 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrEmpty } from "../nullable-defaults";
+
 export const FbIdLoginRequestSchema = z.object({
   fbId: z.string(),
-  avatarUrl: z.string().default(""),
-  isTestAccount: z.boolean().default(false),
+  avatarUrl: stringOrEmpty,
+  isTestAccount: booleanOrFalse,
 });
 
 export type FbIdLoginRequestInput = z.input<typeof FbIdLoginRequestSchema>;

src/data/schemas/auth/google_login_request.ts

@@ -4,11 +4,13 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrEmpty } from "../nullable-defaults";
+
 export const GoogleLoginRequestSchema = z.object({
   idToken: z.string(),
   platform: z.string(),
-  guestId: z.string().default(""),
-  isTestAccount: z.boolean().default(false),
+  guestId: stringOrEmpty,
+  isTestAccount: booleanOrFalse,
 });
 
 export type GoogleLoginRequestInput = z.input<typeof GoogleLoginRequestSchema>;

src/data/schemas/auth/guest_login_request.ts

@@ -4,9 +4,11 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse } from "../nullable-defaults";
+
 export const GuestLoginRequestSchema = z.object({
   deviceId: z.string(),
-  isTestAccount: z.boolean().default(false),
+  isTestAccount: booleanOrFalse,
 });
 
 export type GuestLoginRequestInput = z.input<typeof GuestLoginRequestSchema>;

src/data/schemas/auth/guest_login_response.ts

@@ -3,15 +3,17 @@
  * 
  */
 import { z } from "zod";
+
+import { booleanOrTrue, numberOr, schemaOrNull } from "../nullable-defaults";
 import { UserSchema } from "../user/user";
 
 export const GuestLoginResponseSchema = z.object({
   token: z.string(),
   deviceId: z.string(),
   userId: z.string(),
-  isDeviceUser: z.boolean().default(true),
-  expiresIn: z.number().default(2592000),
-  user: UserSchema.optional(),
+  isDeviceUser: booleanOrTrue,
+  expiresIn: numberOr(2592000),
+  user: schemaOrNull(UserSchema),
 });
 
 export type GuestLoginResponseInput = z.input<typeof GuestLoginResponseSchema>;

src/data/schemas/auth/login_request.ts

@@ -4,13 +4,15 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrEmpty } from "../nullable-defaults";
+
 export const LoginRequestSchema = z.object({
-  email: z.string().default(""),
-  username: z.string().default(""),
+  email: stringOrEmpty,
+  username: stringOrEmpty,
   password: z.string(),
   platform: z.string(),
-  guestId: z.string().default(""),
-  isTestAccount: z.boolean().default(false),
+  guestId: stringOrEmpty,
+  isTestAccount: booleanOrFalse,
 });
 
 export type LoginRequestInput = z.input<typeof LoginRequestSchema>;

src/data/schemas/auth/login_response.ts

@@ -3,12 +3,14 @@
  * 
  */
 import { z } from "zod";
+
+import { stringOrEmpty } from "../nullable-defaults";
 import { UserSchema } from "../user/user";
 
 export const LoginResponseSchema = z.object({
   user: UserSchema,
   token: z.string(),
-  refreshToken: z.string().default(""),
+  refreshToken: stringOrEmpty,
 });
 
 export type LoginResponseInput = z.input<typeof LoginResponseSchema>;

src/data/schemas/auth/logout_response.ts

@@ -4,8 +4,10 @@
  */
 import { z } from "zod";
 
+import { booleanOrTrue } from "../nullable-defaults";
+
 export const LogoutResponseSchema = z.object({
-  success: z.boolean().default(true),
+  success: booleanOrTrue,
 });
 
 export type LogoutResponseInput = z.input<typeof LogoutResponseSchema>;

src/data/schemas/auth/register_request.ts

@@ -4,13 +4,15 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrEmpty } from "../nullable-defaults";
+
 export const RegisterRequestSchema = z.object({
   username: z.string(),
   email: z.string(),
   password: z.string(),
   platform: z.string(),
-  guestId: z.string().default(""),
-  isTestAccount: z.boolean().default(false),
+  guestId: stringOrEmpty,
+  isTestAccount: booleanOrFalse,
 });
 
 export type RegisterRequestInput = z.input<typeof RegisterRequestSchema>;

src/data/schemas/chat/chat_history_response.ts

@@ -3,17 +3,19 @@
  * 
  */
 import { z } from "zod";
+
+import { arrayOrEmpty, booleanOrFalse, numberOrZero } from "../nullable-defaults";
 import { ChatMessageSchema } from "./chat_message";
 
 export const ChatHistoryResponseSchema = z.object({
-  messages: z.array(ChatMessageSchema),
-  total: z.number().default(0),
-  limit: z.number(),
-  offset: z.number(),
-  isVip: z.boolean().default(false),
-  privateFreeLimit: z.number().default(0),
-  privateUsedToday: z.number().default(0),
-  privateCanViewFree: z.boolean().default(false),
+  messages: arrayOrEmpty(ChatMessageSchema),
+  total: numberOrZero,
+  limit: numberOrZero,
+  offset: numberOrZero,
+  isVip: booleanOrFalse,
+  privateFreeLimit: numberOrZero,
+  privateUsedToday: numberOrZero,
+  privateCanViewFree: booleanOrFalse,
 });
 
 export type ChatHistoryResponseInput = z.input<typeof ChatHistoryResponseSchema>;

src/data/schemas/chat/chat_message.ts

@@ -3,17 +3,19 @@
  * 
  */
 import { z } from "zod";
+
+import { stringOr, stringOrEmpty, stringOrNull } from "../nullable-defaults";
 import { ChatImageSchema, ChatLockDetailSchema } from "./chat_payloads";
 
 export const ChatMessageSchema = z
   .object({
-    role: z.string(),
-    type: z.string().default("text"),
-    content: z.string(),
-    id: z.string().default(""),
-    createdAt: z.string().default(""),
-    created_at: z.string().optional(),
-    audioUrl: z.string().nullable().default(null),
+    role: stringOrEmpty,
+    type: stringOr("text"),
+    content: stringOrEmpty,
+    id: stringOrEmpty,
+    createdAt: stringOrEmpty,
+    created_at: stringOrNull,
+    audioUrl: stringOrNull,
     image: ChatImageSchema,
     lockDetail: ChatLockDetailSchema,
   })

src/data/schemas/chat/chat_payloads.ts

@@ -3,30 +3,44 @@
  */
 import { z } from "zod";
 
-export const ChatImageSchema = z
-  .object({
-    type: z.string().nullable().default(null),
-    url: z.string().nullable().default(null),
-  })
-  .default({ type: null, url: null });
+import {
+  booleanOrFalse,
+  booleanOrTrue,
+  schemaOr,
+  stringOrNull,
+  unknownRecordOrNull,
+} from "../nullable-defaults";
 
-export const ChatLockDetailSchema = z
-  .object({
-    locked: z.boolean().default(false),
-    showContent: z.boolean().default(true),
-    showUpgrade: z.boolean().default(false),
-    reason: z.string().nullable().default(null),
-    hint: z.string().nullable().default(null),
-    detail: z.record(z.string(), z.unknown()).nullable().default(null),
-  })
-  .default({
+const CHAT_IMAGE_DEFAULTS = { type: null, url: null } as const;
+
+const CHAT_LOCK_DETAIL_DEFAULTS = {
   locked: false,
   showContent: true,
   showUpgrade: false,
   reason: null,
   hint: null,
   detail: null,
-  });
+} as const;
+
+export const ChatImageSchema = schemaOr(
+  z.object({
+    type: stringOrNull,
+    url: stringOrNull,
+  }),
+  CHAT_IMAGE_DEFAULTS,
+);
+
+export const ChatLockDetailSchema = schemaOr(
+  z.object({
+    locked: booleanOrFalse,
+    showContent: booleanOrTrue,
+    showUpgrade: booleanOrFalse,
+    reason: stringOrNull,
+    hint: stringOrNull,
+    detail: unknownRecordOrNull,
+  }),
+  CHAT_LOCK_DETAIL_DEFAULTS,
+);
 
 export type ChatImageInput = z.input<typeof ChatImageSchema>;
 export type ChatImageData = z.output<typeof ChatImageSchema>;

src/data/schemas/chat/chat_send_response.ts

@@ -3,19 +3,26 @@
  * 
  */
 import { z } from "zod";
-import { booleanOrFalse, numberOrZero, stringOrNull } from "../nullable-defaults";
+import {
+  booleanOrFalse,
+  booleanOrTrue,
+  numberOrLazy,
+  numberOrZero,
+  stringOrEmpty,
+  stringOrNull,
+} from "../nullable-defaults";
 import { ChatImageSchema, ChatLockDetailSchema } from "./chat_payloads";
 
 export const ChatSendResponseSchema = z.object({
-  reply: z.string(),
-  audioUrl: z.string().default(""),
-  messageId: z.string(),
+  reply: stringOrEmpty,
+  audioUrl: stringOrEmpty,
+  messageId: stringOrEmpty,
   isGuest: booleanOrFalse,
   // 函数式 default —— 每次 parse 时重新调 Date.now()（后端不返回 timestamp 时用当下时间）
-  timestamp: z.number().default(() => Date.now()),
+  timestamp: numberOrLazy(() => Date.now()),
   image: ChatImageSchema,
   lockDetail: ChatLockDetailSchema,
-  canSendMessage: z.boolean().default(true),
+  canSendMessage: booleanOrTrue,
   cannotSendReason: stringOrNull,
   creditBalance: numberOrZero,
   creditsCharged: numberOrZero,

src/data/schemas/chat/chat_sync_data.ts

@@ -4,9 +4,11 @@
  */
 import { z } from "zod";
 
+import { numberOrZero } from "../nullable-defaults";
+
 export const ChatSyncDataSchema = z.object({
-  syncedCount: z.number(),
-  totalHistory: z.number(),
+  syncedCount: numberOrZero,
+  totalHistory: numberOrZero,
 });
 
 export type ChatSyncDataInput = z.input<typeof ChatSyncDataSchema>;

src/data/schemas/chat/image_upload_response.ts

@@ -4,15 +4,17 @@
  */
 import { z } from "zod";
 
+import { booleanOrTrue, numberOrZero, stringOrEmpty } from "../nullable-defaults";
+
 export const ImageUploadResponseSchema = z.object({
-  success: z.boolean().default(true),
-  imageId: z.string(),
-  thumbUrl: z.string(),
-  mediumUrl: z.string(),
-  originalUrl: z.string(),
-  width: z.number(),
-  height: z.number(),
-  bytes: z.number(),
+  success: booleanOrTrue,
+  imageId: stringOrEmpty,
+  thumbUrl: stringOrEmpty,
+  mediumUrl: stringOrEmpty,
+  originalUrl: stringOrEmpty,
+  width: numberOrZero,
+  height: numberOrZero,
+  bytes: numberOrZero,
 });
 
 export type ImageUploadResponseInput = z.input<typeof ImageUploadResponseSchema>;

src/data/schemas/chat/send_message_request.ts

@@ -4,16 +4,18 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, numberOrZero, stringOrEmpty } from "../nullable-defaults";
+
 export const SendMessageRequestSchema = z.object({
-  message: z.string().default(""),
-  image: z.string().default(""),
-  imageId: z.string().default(""),
-  imageThumbUrl: z.string().default(""),
-  imageMediumUrl: z.string().default(""),
-  imageOriginalUrl: z.string().default(""),
-  imageWidth: z.number().default(0),
-  imageHeight: z.number().default(0),
-  useWebSocket: z.boolean().default(false),
+  message: stringOrEmpty,
+  image: stringOrEmpty,
+  imageId: stringOrEmpty,
+  imageThumbUrl: stringOrEmpty,
+  imageMediumUrl: stringOrEmpty,
+  imageOriginalUrl: stringOrEmpty,
+  imageWidth: numberOrZero,
+  imageHeight: numberOrZero,
+  useWebSocket: booleanOrFalse,
 });
 
 export type SendMessageRequestInput = z.input<typeof SendMessageRequestSchema>;

src/data/schemas/chat/stt_data.ts

@@ -4,8 +4,10 @@
  */
 import { z } from "zod";
 
+import { stringOrEmpty } from "../nullable-defaults";
+
 export const SttDataSchema = z.object({
-  text: z.string(),
+  text: stringOrEmpty,
 });
 
 export type SttDataInput = z.input<typeof SttDataSchema>;

src/data/schemas/chat/sync_message.ts

@@ -4,10 +4,12 @@
  */
 import { z } from "zod";
 
+import { stringOrEmpty } from "../nullable-defaults";
+
 export const SyncMessageSchema = z.object({
-  role: z.string(),
-  content: z.string(),
-  timestamp: z.string(),
+  role: stringOrEmpty,
+  content: stringOrEmpty,
+  timestamp: stringOrEmpty,
 });
 
 export type SyncMessageInput = z.input<typeof SyncMessageSchema>;

src/data/schemas/chat/unlock_history_response.ts

@@ -3,7 +3,9 @@
  */
 import { z } from "zod";
 
-export const UnlockHistoryCostsByMessageSchema = z.record(z.string(), z.number());
+import { arrayOrEmpty, booleanOrFalse, numberOrZero, recordOrEmpty } from "../nullable-defaults";
+
+export const UnlockHistoryCostsByMessageSchema = recordOrEmpty(z.number());
 
 export const UnlockHistoryReasonSchema = z.enum([
   "ok",
@@ -12,19 +14,19 @@ export const UnlockHistoryReasonSchema = z.enum([
 ]);
 
 export const UnlockHistoryResponseSchema = z.object({
-  unlocked: z.boolean(),
+  unlocked: booleanOrFalse,
   reason: UnlockHistoryReasonSchema,
-  totalLocked: z.number().default(0),
-  unlockedCount: z.number().default(0),
-  privateCount: z.number().default(0),
-  imageCount: z.number().default(0),
-  voiceCount: z.number().default(0),
-  requiredCredits: z.number().default(0),
-  currentCredits: z.number().default(0),
-  remainingCredits: z.number().default(0),
-  shortfallCredits: z.number().default(0),
-  costsByMessage: UnlockHistoryCostsByMessageSchema.default({}),
-  messageIds: z.array(z.string()).default([]),
+  totalLocked: numberOrZero,
+  unlockedCount: numberOrZero,
+  privateCount: numberOrZero,
+  imageCount: numberOrZero,
+  voiceCount: numberOrZero,
+  requiredCredits: numberOrZero,
+  currentCredits: numberOrZero,
+  remainingCredits: numberOrZero,
+  shortfallCredits: numberOrZero,
+  costsByMessage: UnlockHistoryCostsByMessageSchema,
+  messageIds: arrayOrEmpty(z.string()),
 });
 
 export type UnlockHistoryReason = z.output<typeof UnlockHistoryReasonSchema>;

src/data/schemas/chat/unlock_private_response.ts

@@ -1,15 +1,15 @@
 import { z } from "zod";
 
-import { numberOrZero, stringOrEmpty } from "../nullable-defaults";
+import { booleanOrFalse, numberOrZero, stringOrEmpty } from "../nullable-defaults";
 import { ChatLockDetailSchema } from "./chat_payloads";
 
 /**
  * 单条历史付费 / 私密消息解锁响应。
  */
-export const UnlockPrivateReasonSchema = z.string().default("");
+export const UnlockPrivateReasonSchema = stringOrEmpty;
 
 export const UnlockPrivateResponseSchema = z.object({
-  unlocked: z.boolean(),
+  unlocked: booleanOrFalse,
   content: stringOrEmpty,
   reason: UnlockPrivateReasonSchema,
   creditBalance: numberOrZero,

src/data/schemas/metrics/app_event.ts

@@ -4,10 +4,12 @@
  */
 import { z } from "zod";
 
+import { stringOrEmpty } from "../nullable-defaults";
+
 export const AppEventSchema = z.object({
-  userId: z.string(),
-  browser: z.string(),
-  userAgent: z.string(),
+  userId: stringOrEmpty,
+  browser: stringOrEmpty,
+  userAgent: stringOrEmpty,
 });
 
 export type AppEventInput = z.input<typeof AppEventSchema>;

src/data/schemas/metrics/pwa_event.ts

@@ -4,12 +4,18 @@
  */
 import { z } from "zod";
 
+import {
+  booleanOrFalse,
+  numberOrZero,
+  stringOrEmpty,
+} from "../nullable-defaults";
+
 export const PwaEventSchema = z.object({
-  deviceId: z.string(),
-  deviceType: z.string(),
-  timestamp: z.number(),
-  pwaInstalled: z.boolean().default(false),
-  pwaSupported: z.boolean().default(false),
+  deviceId: stringOrEmpty,
+  deviceType: stringOrEmpty,
+  timestamp: numberOrZero,
+  pwaInstalled: booleanOrFalse,
+  pwaSupported: booleanOrFalse,
 });
 
 export type PwaEventInput = z.input<typeof PwaEventSchema>;

src/data/schemas/nullable-defaults.ts

@@ -1,5 +1,5 @@
 /**
- * Zod 默认值辅助器（处理 `null | undefined` → 标量默认）
+ * Zod 默认值辅助器（处理 `null | undefined` → 默认值）
  *
  * 防御性解析：后端对 Facebook / Apple 等 OAuth 用户可能返回 `null`（如 `email: null`），
  * Zod 默认的 `.default("")` 只接受 `undefined`，遇到 `null` 会抛 ZodError → 登录静默失败。
@@ -11,26 +11,131 @@
  */
 import { z } from "zod";
 
-/** `string | null | undefined` → `string`（默认空串） */
-export const stringOrEmpty = z
+type SchemaDefault<T extends z.ZodType> = Exclude<z.output<T>, undefined>;
+
+/** `string | null | undefined` → `string` */
+export function stringOr(defaultValue: string) {
+  return z
     .string()
     .nullable()
-  .transform((v) => v ?? "")
-  .default("");
+    .transform((v) => v ?? defaultValue)
+    .default(defaultValue);
+}
+
+/** `string | null | undefined` → `string`（默认空串） */
+export const stringOrEmpty = stringOr("");
+
+/** required `string | null` → `string`（缺字段仍报错，null 收敛为空串） */
+export const requiredStringOrEmpty = z
+  .string()
+  .nullable()
+  .transform((v) => v ?? "");
 
 /** `string | null | undefined` → `string | null`（默认 null） */
 export const stringOrNull = z.string().nullable().default(null);
 
-/** `number | null | undefined` → `number`（默认 0） */
-export const numberOrZero = z
+/** `number | null | undefined` → `number` */
+export function numberOr(defaultValue: number) {
+  return z
     .number()
     .nullable()
-  .transform((v) => v ?? 0)
-  .default(0);
+    .transform((v) => v ?? defaultValue)
+    .default(defaultValue);
+}
 
-/** `boolean | null | undefined` → `boolean`（默认 false） */
-export const booleanOrFalse = z
+/** `number | null | undefined` → `number`，默认值在 parse 时惰性计算 */
+export function numberOrLazy(defaultValue: () => number) {
+  return z
+    .number()
+    .nullable()
+    .transform((v) => v ?? defaultValue())
+    .default(defaultValue);
+}
+
+/** `number | null | undefined` → `number`（默认 0） */
+export const numberOrZero = numberOr(0);
+
+/** required `number | null` → `number`（缺字段仍报错，null 收敛为 0） */
+export const requiredNumberOrZero = z
+  .number()
+  .nullable()
+  .transform((v) => v ?? 0);
+
+/** `number | null | undefined` → `number | null`（默认 null） */
+export const numberOrNull = z.number().nullable().default(null);
+
+/** `boolean | null | undefined` → `boolean` */
+export function booleanOr(defaultValue: boolean) {
+  return z
     .boolean()
     .nullable()
-  .transform((v) => v ?? false)
-  .default(false);
+    .transform((v) => v ?? defaultValue)
+    .default(defaultValue);
+}
+
+/** `boolean | null | undefined` → `boolean`（默认 false） */
+export const booleanOrFalse = booleanOr(false);
+
+/** `boolean | null | undefined` → `boolean`（默认 true） */
+export const booleanOrTrue = booleanOr(true);
+
+/** required `boolean | null` → `boolean`（缺字段仍报错，null 收敛为 false） */
+export const requiredBooleanOrFalse = z
+  .boolean()
+  .nullable()
+  .transform((v) => v ?? false);
+
+/** `T[] | null | undefined` → `T[]`（默认空数组） */
+export function arrayOrEmpty<T extends z.ZodType>(schema: T) {
+  return z
+    .array(schema)
+    .nullable()
+    .transform((v) => v ?? [])
+    .default(() => []);
+}
+
+/** `Record<string, T> | null | undefined` → `Record<string, T>`（默认空对象） */
+export function recordOrEmpty<T extends z.ZodType>(schema: T) {
+  return z
+    .record(z.string(), schema)
+    .nullable()
+    .transform((v) => v ?? {})
+    .default(() => ({}));
+}
+
+/** `Record<string, unknown> | null | undefined` → `Record<string, unknown>` */
+export const unknownRecordOrEmpty = recordOrEmpty(z.unknown());
+
+/** `Record<string, unknown> | null | undefined` → `Record<string, unknown> | null` */
+export const unknownRecordOrNull = z
+  .record(z.string(), z.unknown())
+  .nullable()
+  .default(null);
+
+function resolveDefault<T>(defaultValue: T | (() => T)): T {
+  return typeof defaultValue === "function"
+    ? (defaultValue as () => T)()
+    : defaultValue;
+}
+
+/** `T | null | undefined` → `T`（默认对象会继续经过 schema 解析） */
+export function schemaOr<T extends z.ZodType>(
+  schema: T,
+  defaultValue: SchemaDefault<T> | (() => SchemaDefault<T>),
+) {
+  const preprocessed = z.preprocess(
+    (value) => value ?? resolveDefault(defaultValue),
+    schema,
+  );
+
+  if (typeof defaultValue === "function") {
+    return preprocessed.default(defaultValue as () => SchemaDefault<T>);
+  }
+
+  return preprocessed.default(defaultValue);
+}
+
+/** `T | null | undefined` → `T | null`（默认 null） */
+export function schemaOrNull<T extends z.ZodType>(schema: T) {
+  return schema.nullable().default(null);
+}

src/data/schemas/payment/create_payment_order_response.ts

@@ -3,6 +3,8 @@
  */
 import { z } from "zod";
 
+import { stringOrNull } from "../nullable-defaults";
+
 const paymentUrlKeys = [
   "cashierUrl",
   "cashier_url",
@@ -20,17 +22,17 @@ const paymentUrlKeys = [
 export const CreatePaymentOrderResponseSchema = z.object({
   orderId: z.string(),
   payParams: z.record(z.string(), z.unknown()),
-  cashierUrl: z.string().optional(),
-  cashier_url: z.string().optional(),
-  checkoutUrl: z.string().optional(),
-  checkout_url: z.string().optional(),
-  paymentUrl: z.string().optional(),
-  payment_url: z.string().optional(),
-  approvalUrl: z.string().optional(),
-  approval_url: z.string().optional(),
-  redirectUrl: z.string().optional(),
-  redirect_url: z.string().optional(),
-  url: z.string().optional(),
+  cashierUrl: stringOrNull,
+  cashier_url: stringOrNull,
+  checkoutUrl: stringOrNull,
+  checkout_url: stringOrNull,
+  paymentUrl: stringOrNull,
+  payment_url: stringOrNull,
+  approvalUrl: stringOrNull,
+  approval_url: stringOrNull,
+  redirectUrl: stringOrNull,
+  redirect_url: stringOrNull,
+  url: stringOrNull,
 }).transform((data) => {
   const payParams = { ...data.payParams };
 

src/data/schemas/payment/payment_plan.ts

@@ -3,20 +3,26 @@
  */
 import { z } from "zod";
 
+import {
+  booleanOrFalse,
+  numberOrNull,
+  stringOrNull,
+} from "../nullable-defaults";
+
 export const PaymentPlanSchema = z.object({
   planId: z.string(),
   planName: z.string(),
   orderType: z.string(),
-  vipDays: z.number().nullable(),
-  dolAmount: z.number().nullable(),
+  vipDays: numberOrNull,
+  dolAmount: numberOrNull,
   creditBalance: z.number(),
   amountCents: z.number(),
-  originalAmountCents: z.number().nullable().default(null),
-  dailyPriceCents: z.number().nullable().default(null),
+  originalAmountCents: numberOrNull,
+  dailyPriceCents: numberOrNull,
   currency: z.string(),
-  isFirstRechargeOffer: z.boolean().default(false),
-  firstRechargeDiscountPercent: z.number().nullable().default(null),
-  promotionType: z.string().nullable().default(null),
+  isFirstRechargeOffer: booleanOrFalse,
+  firstRechargeDiscountPercent: numberOrNull,
+  promotionType: stringOrNull,
 });
 
 export type PaymentPlanInput = z.input<typeof PaymentPlanSchema>;

src/data/schemas/payment/payment_plans_response.ts

@@ -3,7 +3,13 @@
  */
 import { z } from "zod";
 
-import { booleanOrFalse, numberOrZero, stringOrEmpty } from "../nullable-defaults";
+import {
+  arrayOrEmpty,
+  booleanOrFalse,
+  numberOrZero,
+  schemaOrNull,
+  stringOrEmpty,
+} from "../nullable-defaults";
 import { PaymentPlanSchema } from "./payment_plan";
 
 export const FirstRechargeOfferSchema = z.object({
@@ -13,9 +19,9 @@ export const FirstRechargeOfferSchema = z.object({
 });
 
 export const PaymentPlansResponseSchema = z.object({
-  isFirstRecharge: z.boolean().default(false),
-  firstRechargeOffer: FirstRechargeOfferSchema.nullable().default(null),
-  plans: z.array(PaymentPlanSchema),
+  isFirstRecharge: booleanOrFalse,
+  firstRechargeOffer: schemaOrNull(FirstRechargeOfferSchema),
+  plans: arrayOrEmpty(PaymentPlanSchema),
 });
 
 export type PaymentPlansResponseInput = z.input<

src/data/schemas/payment/payment_vip_status_response.ts

@@ -3,9 +3,11 @@
  */
 import { z } from "zod";
 
+import { booleanOrFalse, stringOrNull } from "../nullable-defaults";
+
 export const PaymentVipStatusResponseSchema = z.object({
-  isVip: z.boolean(),
-  vipExpiresAt: z.string().nullable(),
+  isVip: booleanOrFalse,
+  vipExpiresAt: stringOrNull,
 });
 
 export type PaymentVipStatusResponseInput = z.input<

src/data/schemas/user/avatar_data.ts

@@ -4,9 +4,11 @@
  */
 import { z } from "zod";
 
+import { stringOrEmpty } from "../nullable-defaults";
+
 export const AvatarDataSchema = z.object({
-  avatarUrl: z.string().default(""),
-  userId: z.string(),
+  avatarUrl: stringOrEmpty,
+  userId: stringOrEmpty,
 });
 
 export type AvatarDataInput = z.input<typeof AvatarDataSchema>;

src/data/schemas/user/credits_data.ts

@@ -4,9 +4,11 @@
  */
 import { z } from "zod";
 
+import { numberOrZero, stringOrEmpty } from "../nullable-defaults";
+
 export const CreditsDataSchema = z.object({
-  userId: z.string(),
-  dolBalance: z.number(),
+  userId: stringOrEmpty,
+  dolBalance: numberOrZero,
 });
 
 export type CreditsDataInput = z.input<typeof CreditsDataSchema>;

src/data/schemas/user/credits_history_data.ts

@@ -4,11 +4,13 @@
  */
 import { z } from "zod";
 
+import { arrayOrEmpty, numberOrZero } from "../nullable-defaults";
+
 export const CreditsHistoryDataSchema = z.object({
-  records: z.array(z.record(z.string(), z.unknown())),
-  total: z.number(),
-  limit: z.number(),
-  offset: z.number(),
+  records: arrayOrEmpty(z.record(z.string(), z.unknown())),
+  total: numberOrZero,
+  limit: numberOrZero,
+  offset: numberOrZero,
 });
 
 export type CreditsHistoryDataInput = z.input<typeof CreditsHistoryDataSchema>;

src/data/schemas/user/personality_traits.ts

@@ -4,6 +4,8 @@
  */
 import { z } from "zod";
 
+import { numberOr } from "../nullable-defaults";
+
 export const PERSONALITY_TRAITS_DEFAULTS = {
   cheerful: 0.5,
   caring: 0.5,
@@ -13,11 +15,11 @@ export const PERSONALITY_TRAITS_DEFAULTS = {
 } as const;
 
 export const PersonalityTraitsSchema = z.object({
-  cheerful: z.number().default(0.5),
-  caring: z.number().default(0.5),
-  playful: z.number().default(0.5),
-  serious: z.number().default(0.5),
-  romantic: z.number().default(0.5),
+  cheerful: numberOr(0.5),
+  caring: numberOr(0.5),
+  playful: numberOr(0.5),
+  serious: numberOr(0.5),
+  romantic: numberOr(0.5),
 });
 
 export type PersonalityTraitsInput = z.input<typeof PersonalityTraitsSchema>;

src/data/schemas/user/recent_memory.ts

@@ -4,11 +4,13 @@
  */
 import { z } from "zod";
 
+import { numberOrZero, stringOrEmpty } from "../nullable-defaults";
+
 export const RecentMemorySchema = z.object({
-  type: z.string(),
-  content: z.string(),
-  importance: z.number(),
-  createdAt: z.string().default(""),
+  type: stringOrEmpty,
+  content: stringOrEmpty,
+  importance: numberOrZero,
+  createdAt: stringOrEmpty,
 });
 
 export type RecentMemoryInput = z.input<typeof RecentMemorySchema>;

src/data/schemas/user/update_profile_request.ts

@@ -4,11 +4,13 @@
  */
 import { z } from "zod";
 
+import { stringOrEmpty } from "../nullable-defaults";
+
 export const UpdateProfileRequestSchema = z.object({
-  username: z.string().default(""),
-  nickname: z.string().default(""),
-  preferredLanguage: z.string().default(""),
-  currentMood: z.string().default(""),
+  username: stringOrEmpty,
+  nickname: stringOrEmpty,
+  preferredLanguage: stringOrEmpty,
+  currentMood: stringOrEmpty,
 });
 
 export type UpdateProfileRequestInput = z.input<typeof UpdateProfileRequestSchema>;

src/data/schemas/user/user.ts

@@ -6,6 +6,7 @@ import { z } from "zod";
 import { PersonalityTraitsSchema, PERSONALITY_TRAITS_DEFAULTS } from "./personality_traits";
 import {
   numberOrZero,
+  schemaOr,
   stringOrEmpty,
 } from "../nullable-defaults";
 
@@ -25,7 +26,7 @@ export const UserSchema = z.object({
   dailyFreePrivateLimit: numberOrZero,
   dailyFreePrivateUsed: numberOrZero,
   dailyFreePrivateRemaining: numberOrZero,
-  personalityTraits: PersonalityTraitsSchema.default(PERSONALITY_TRAITS_DEFAULTS),
+  personalityTraits: schemaOr(PersonalityTraitsSchema, PERSONALITY_TRAITS_DEFAULTS),
   preferredLanguage: stringOrEmpty,
   createdAt: stringOrEmpty,
   // 后端新游客返回 null（"还没发过消息"），前端统一收敛为空字符串。

src/data/schemas/user/user_entitlements.ts

@@ -6,9 +6,49 @@ import { z } from "zod";
 import {
   booleanOrFalse,
   numberOrZero,
+  schemaOr,
   stringOrEmpty,
+  stringOrNull,
 } from "../nullable-defaults";
 
+const POLICY_DEFAULTS = {
+  membershipState: "",
+  nonVipEntitlementsShared: false,
+  guestSameAsLoggedInNonVip: false,
+  refreshAfterPayment: "",
+} as const;
+
+const COSTS_DEFAULTS = {
+  normal_message: 0,
+  private_message: 0,
+  voice_message: 0,
+  photo: 0,
+  voice_call_minute: 0,
+  private_album_10: 0,
+  private_album_20: 0,
+} as const;
+
+const QUOTAS_DEFAULTS = {
+  normalChatFreeDaily: 0,
+  privateUnlockFreeDaily: 0,
+  voiceMessageFreeDaily: 0,
+  photoFreeDaily: 0,
+} as const;
+
+const HISTORY_UNLOCK_COSTS_DEFAULTS = {
+  private_message: 0,
+  voice_message: 0,
+  photo: 0,
+} as const;
+
+const HISTORY_UNLOCK_DEFAULTS = {
+  enabled: false,
+  order: "",
+  chargeMode: "",
+  insufficientBalanceBehavior: "",
+  costs: HISTORY_UNLOCK_COSTS_DEFAULTS,
+} as const;
+
 export const UserEntitlementsPolicySchema = z
   .object({
     membershipState: stringOrEmpty,
@@ -39,24 +79,24 @@ export const UserEntitlementsQuotasSchema = z
   })
   .passthrough();
 
+export const UserEntitlementsHistoryUnlockCostsSchema = z
+  .object({
+    private_message: numberOrZero,
+    voice_message: numberOrZero,
+    photo: numberOrZero,
+  })
+  .passthrough();
+
 export const UserEntitlementsHistoryUnlockSchema = z
   .object({
     enabled: booleanOrFalse,
     order: stringOrEmpty,
     chargeMode: stringOrEmpty,
     insufficientBalanceBehavior: stringOrEmpty,
-    costs: z
-      .object({
-        private_message: numberOrZero,
-        voice_message: numberOrZero,
-        photo: numberOrZero,
-      })
-      .passthrough()
-      .default(() => ({
-        private_message: 0,
-        voice_message: 0,
-        photo: 0,
-      })),
+    costs: schemaOr(
+      UserEntitlementsHistoryUnlockCostsSchema,
+      HISTORY_UNLOCK_COSTS_DEFAULTS,
+    ),
   })
   .passthrough();
 
@@ -64,41 +104,16 @@ export const UserEntitlementsSchema = z.object({
   userId: stringOrEmpty,
   isGuest: booleanOrFalse,
   isVip: booleanOrFalse,
-  vipExpiresAt: z.string().nullable().default(null),
+  vipExpiresAt: stringOrNull,
   creditBalance: numberOrZero,
   dolBalance: numberOrZero,
-  policy: UserEntitlementsPolicySchema.default(() => ({
-    membershipState: "",
-    nonVipEntitlementsShared: false,
-    guestSameAsLoggedInNonVip: false,
-    refreshAfterPayment: "",
-  })),
-  costs: UserEntitlementsCostsSchema.default(() => ({
-    normal_message: 0,
-    private_message: 0,
-    voice_message: 0,
-    photo: 0,
-    voice_call_minute: 0,
-    private_album_10: 0,
-    private_album_20: 0,
-  })),
-  quotas: UserEntitlementsQuotasSchema.default(() => ({
-    normalChatFreeDaily: 0,
-    privateUnlockFreeDaily: 0,
-    voiceMessageFreeDaily: 0,
-    photoFreeDaily: 0,
-  })),
-  historyUnlock: UserEntitlementsHistoryUnlockSchema.default(() => ({
-    enabled: false,
-    order: "",
-    chargeMode: "",
-    insufficientBalanceBehavior: "",
-    costs: {
-      private_message: 0,
-      voice_message: 0,
-      photo: 0,
-    },
-  })),
+  policy: schemaOr(UserEntitlementsPolicySchema, POLICY_DEFAULTS),
+  costs: schemaOr(UserEntitlementsCostsSchema, COSTS_DEFAULTS),
+  quotas: schemaOr(UserEntitlementsQuotasSchema, QUOTAS_DEFAULTS),
+  historyUnlock: schemaOr(
+    UserEntitlementsHistoryUnlockSchema,
+    HISTORY_UNLOCK_DEFAULTS,
+  ),
 });
 
 export type UserEntitlementsInput = z.input<typeof UserEntitlementsSchema>;

src/data/schemas/user/user_stats_response.ts

@@ -3,26 +3,33 @@
  * 
  */
 import { z } from "zod";
+
+import {
+  arrayOrEmpty,
+  numberOrZero,
+  schemaOr,
+  stringOrEmpty,
+} from "../nullable-defaults";
 import { PersonalityTraitsSchema, PERSONALITY_TRAITS_DEFAULTS } from "./personality_traits";
 import { RecentMemorySchema } from "./recent_memory";
 
 export const UserStatsResponseSchema = z.object({
-  userId: z.string(),
-  username: z.string(),
-  platform: z.string(),
-  intimacy: z.number(),
-  relationshipStage: z.string(),
-  dolBalance: z.number(),
-  totalMessages: z.number(),
-  lastMessageAt: z.string().default(""),
-  accountCreatedAt: z.string().default(""),
-  currentMood: z.string().default(""),
-  personalityTraits: PersonalityTraitsSchema.default(PERSONALITY_TRAITS_DEFAULTS),
-  recentMemories: z.array(RecentMemorySchema).default([]),
-  promptTokensTotal: z.number().default(0),
-  completionTokensTotal: z.number().default(0),
-  cacheHitTokensTotal: z.number().default(0),
-  tokensTotal: z.number().default(0),
+  userId: stringOrEmpty,
+  username: stringOrEmpty,
+  platform: stringOrEmpty,
+  intimacy: numberOrZero,
+  relationshipStage: stringOrEmpty,
+  dolBalance: numberOrZero,
+  totalMessages: numberOrZero,
+  lastMessageAt: stringOrEmpty,
+  accountCreatedAt: stringOrEmpty,
+  currentMood: stringOrEmpty,
+  personalityTraits: schemaOr(PersonalityTraitsSchema, PERSONALITY_TRAITS_DEFAULTS),
+  recentMemories: arrayOrEmpty(RecentMemorySchema),
+  promptTokensTotal: numberOrZero,
+  completionTokensTotal: numberOrZero,
+  cacheHitTokensTotal: numberOrZero,
+  tokensTotal: numberOrZero,
 });
 
 export type UserStatsResponseInput = z.input<typeof UserStatsResponseSchema>;