✨ feat: add new setting for default image num (#9618)

.cursor/rules/add-setting-env.mdc

@@ -0,0 +1,175 @@
+---
+description: Guide for adding environment variables to configure user settings
+alwaysApply: false
+---
+
+# Adding Environment Variable for User Settings
+
+Add server-side environment variables to configure default values for user settings.
+
+**Priority**: User Custom > Server Env Var > Hardcoded Default
+
+## Steps
+
+### 1. Define Environment Variable
+
+Create `src/envs/<domain>.ts`:
+
+```typescript
+import { createEnv } from '@t3-oss/env-nextjs';
+import { z } from 'zod';
+
+export const get<Domain>Config = () => {
+  return createEnv({
+    server: {
+      YOUR_ENV_VAR: z.coerce.number().min(MIN).max(MAX).optional(),
+    },
+    runtimeEnv: {
+      YOUR_ENV_VAR: process.env.YOUR_ENV_VAR,
+    },
+  });
+};
+
+export const <domain>Env = get<Domain>Config();
+```
+
+### 2. Update Type (Optional)
+
+**Skip this step if the domain field already exists in `GlobalServerConfig`.**
+
+Add to `packages/types/src/serverConfig.ts`:
+
+```typescript
+export interface GlobalServerConfig {
+  <domain>?: {
+    <settingName>?: <type>;
+  };
+}
+```
+
+**Prefer reusing existing types** from `packages/types/src/user/settings` with `PartialDeep`:
+
+```typescript
+import { User<Domain>Config } from './user/settings';
+
+export interface GlobalServerConfig {
+  <domain>?: PartialDeep<User<Domain>Config>;
+}
+```
+
+### 3. Assemble Server Config (Optional)
+
+**Skip this step if the domain field already exists in server config.**
+
+In `src/server/globalConfig/index.ts`:
+
+```typescript
+import { <domain>Env } from '@/envs/<domain>';
+import { cleanObject } from '@/utils/object';
+
+export const getServerGlobalConfig = async () => {
+  const config: GlobalServerConfig = {
+    // ...
+    <domain>: cleanObject({
+      <settingName>: <domain>Env.YOUR_ENV_VAR,
+    }),
+  };
+  return config;
+};
+```
+
+If the domain already exists, just add the new field to the existing `cleanObject()`:
+
+```typescript
+<domain>: cleanObject({
+  existingField: <domain>Env.EXISTING_VAR,
+  <settingName>: <domain>Env.YOUR_ENV_VAR, // Add this line
+}),
+```
+
+### 4. Merge to User Store (Optional)
+
+**Skip this step if the domain field already exists in `serverSettings`.**
+
+In `src/store/user/slices/common/action.ts`, add to `serverSettings`:
+
+```typescript
+const serverSettings: PartialDeep<UserSettings> = {
+  defaultAgent: serverConfig.defaultAgent,
+  <domain>: serverConfig.<domain>, // Add this line
+  // ...
+};
+```
+
+### 5. Update .env.example
+
+```bash
+# <Description> (range/options, default: X)
+# YOUR_ENV_VAR=<example>
+```
+
+### 6. Update Documentation
+
+Update both English and Chinese documentation:
+- `docs/self-hosting/environment-variables/basic.mdx`
+- `docs/self-hosting/environment-variables/basic.zh-CN.mdx`
+
+Add new section or subsection with environment variable details (type, description, default, example, range/constraints).
+
+## Type Reuse
+
+**Prefer reusing existing types** from `packages/types/src/user/settings` instead of defining inline types in `serverConfig.ts`.
+
+```typescript
+// ✅ Good - reuse existing type
+import { UserImageConfig } from './user/settings';
+
+export interface GlobalServerConfig {
+  image?: PartialDeep<UserImageConfig>;
+}
+
+// ❌ Bad - inline type definition
+export interface GlobalServerConfig {
+  image?: {
+    defaultImageNum?: number;
+  };
+}
+```
+
+## Example: AI_IMAGE_DEFAULT_IMAGE_NUM
+
+```typescript
+// src/envs/image.ts
+export const getImageConfig = () => {
+  return createEnv({
+    server: {
+      AI_IMAGE_DEFAULT_IMAGE_NUM: z.coerce.number().min(1).max(20).optional(),
+    },
+    runtimeEnv: {
+      AI_IMAGE_DEFAULT_IMAGE_NUM: process.env.AI_IMAGE_DEFAULT_IMAGE_NUM,
+    },
+  });
+};
+
+// packages/types/src/serverConfig.ts
+import { UserImageConfig } from './user/settings';
+
+export interface GlobalServerConfig {
+  image?: PartialDeep<UserImageConfig>;
+}
+
+// src/server/globalConfig/index.ts
+image: cleanObject({
+  defaultImageNum: imageEnv.AI_IMAGE_DEFAULT_IMAGE_NUM,
+}),
+
+// src/store/user/slices/common/action.ts
+const serverSettings: PartialDeep<UserSettings> = {
+  image: serverConfig.image,
+  // ...
+};
+
+// .env.example
+# AI_IMAGE_DEFAULT_IMAGE_NUM=4
+```
+

.cursor/rules/db-migrations.mdc

@@ -0,0 +1,25 @@
+---
+globs: packages/database/migrations/**/*
+alwaysApply: false
+---
+
+# Database Migrations Guide
+
+## Defensive Programming - Use Idempotent Clauses
+
+Always use defensive clauses to make migrations idempotent:
+
+```sql
+-- ✅ Good: Idempotent operations
+ALTER TABLE "users" ADD COLUMN IF NOT EXISTS "avatar" text;
+DROP TABLE IF EXISTS "old_table";
+CREATE INDEX IF NOT EXISTS "users_email_idx" ON "users" ("email");
+ALTER TABLE "posts" DROP COLUMN IF EXISTS "deprecated_field";
+
+-- ❌ Bad: Non-idempotent operations
+ALTER TABLE "users" ADD COLUMN "avatar" text;
+DROP TABLE "old_table";
+CREATE INDEX "users_email_idx" ON "users" ("email");
+```
+
+**Important**: After modifying migration SQL (e.g., adding `IF NOT EXISTS` clauses), run `bun run db:generate-client` to update the hash in `packages/database/src/core/migrations.json`.