feat: 网盘设置加「默认账号」列, 同类型最多2个主账号

- 数据库 migration: cloud_configs 加 is_primary 字段
- 后端: togglePrimary API (PUT /admin/cloud-configs/:id/primary)
- 后端: getAndValidateCredential 优先选 is_primary 账号
- 前端: CloudConfig.vue 转存启用后加「默认账号」开关列
- 前端: api/index.ts 加 setPrimary 方法

packages/backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cloudsearch-backend",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "private": true,
   "scripts": {
     "dev": "tsx watch src/main.ts",

packages/backend/src/cloud/cloud.service.ts

@@ -141,7 +141,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
   }
 
   // ── Unified credential validation ──
-  const credential = await getAndValidateCredential(cloudType);
+  const credential = await getAndValidateCredential(cloudType, ipAddress);
   if (!credential.valid || !credential.config) {
     return { success: false, message: credential.message };
   }

packages/backend/src/cloud/credential.service.ts

@@ -33,6 +33,7 @@ export interface CloudConfig {
   is_active: number;
   promotion_account?: string;
   is_transfer_enabled: number;
+  is_primary: number;
   storage_used?: string;
   storage_total?: string;
   checkin_status: string;       // 'none'|'success'|'failed'|'pending'|'skipped'
@@ -70,7 +71,7 @@ function extractQuarkUid(cookie: string): string | null {
 export function getCloudConfigs(): CloudConfig[] {
   const db = getDb();
   return db.prepare(
-    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at, verification_status
@@ -81,7 +82,7 @@ export function getCloudConfigs(): CloudConfig[] {
 export function getAvailableClouds(): CloudConfig[] {
   const db = getDb();
   return db.prepare(
-    `SELECT id, cloud_type, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at
@@ -93,7 +94,7 @@ export function getAvailableClouds(): CloudConfig[] {
 export function getCloudConfigByType(cloudType: string): CloudConfig | undefined {
   const db = getDb();
   return db.prepare(
-    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at, verification_status
@@ -105,7 +106,7 @@ export function getCloudConfigByType(cloudType: string): CloudConfig | undefined
 export function getCloudConfigById(id: number): CloudConfig | undefined {
   const db = getDb();
   return db.prepare(
-    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at, verification_status
@@ -117,7 +118,7 @@ export function getCloudConfigById(id: number): CloudConfig | undefined {
 export function getActiveCloudConfigs(): CloudConfig[] {
   const db = getDb();
   return db.prepare(
-    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at
@@ -126,6 +127,31 @@ export function getActiveCloudConfigs(): CloudConfig[] {
   ).all() as CloudConfig[];
 }
 
+/**
+ * Toggle the is_primary flag for a cloud config.
+ * Enforces max 2 primary accounts per cloud type.
+ */
+export function togglePrimary(id: number, setPrimary: boolean): CloudConfig {
+  const db = getDb();
+  const config = getCloudConfigById(id);
+  if (!config) throw new Error(`Cloud config ${id} not found`);
+
+  if (setPrimary) {
+    // Check how many primary accounts already exist for this cloud type
+    const primaryCount = db.prepare(
+      `SELECT COUNT(*) as c FROM cloud_configs WHERE cloud_type = ? AND is_primary = 1 AND id != ?`
+    ).get(config.cloud_type, id) as { c: number };
+    if (primaryCount.c >= 2) {
+      throw new Error(`同类型网盘最多只能设置 2 个默认账号（已存在 ${primaryCount.c} 个）`);
+    }
+  }
+
+  db.prepare(`UPDATE cloud_configs SET is_primary = ?, updated_at = datetime('now', 'localtime') WHERE id = ?`)
+    .run(setPrimary ? 1 : 0, id);
+
+  return getCloudConfigById(id)!;
+}
+
 export function saveCloudConfig(data: {
   id?: number;
   cloud_type: string;
@@ -199,7 +225,7 @@ export function saveCloudConfig(data: {
       // Re-read savedId for return
       const savedId = existing.id;
       return db.prepare(
-        `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+        `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
                 cloud_type_uid,
                 checkin_status, last_checkin_at, checkin_message, consecutive_failures,
                 last_used_at, total_saves, created_at, updated_at
@@ -215,7 +241,7 @@ export function saveCloudConfig(data: {
 
   const savedId = data.id || (db.prepare('SELECT last_insert_rowid() as id').get() as any).id;
   return db.prepare(
-    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, storage_used, storage_total,
+    `SELECT id, cloud_type, cookie, nickname, is_active, promotion_account, is_transfer_enabled, is_primary, storage_used, storage_total,
             cloud_type_uid,
             checkin_status, last_checkin_at, checkin_message, consecutive_failures,
             last_used_at, total_saves, created_at, updated_at
@@ -397,16 +423,79 @@ export interface CredentialValidationResult {
  * 
  * Reference: search-ucmao get_and_validate_credential() pattern.
  */
-export async function getAndValidateCredential(cloudType: string): Promise<CredentialValidationResult> {
+export async function getAndValidateCredential(cloudType: string, ipAddress?: string): Promise<CredentialValidationResult> {
   const db = getDb();
 
-  const config = db.prepare(
+  let config: CloudConfig | undefined;
+
+  if (!ipAddress) {
+    // No IP info — fallback to simple LUR
+    config = db.prepare(
       `SELECT * FROM cloud_configs
        WHERE cloud_type = ? AND is_active = 1
        AND consecutive_failures < 5
-     ORDER BY last_used_at ASC NULLS FIRST
+       ORDER BY is_primary DESC, last_used_at ASC NULLS FIRST
        LIMIT 1`
     ).get(cloudType) as CloudConfig | undefined;
+  } else {
+    // Get today's date in Shanghai time
+    const today = (() => {
+      const now = new Date();
+      const shanghai = new Date(now.toLocaleString('en-US', { timeZone: 'Asia/Shanghai' }));
+      return shanghai.toISOString().slice(0, 10);
+    })();
+
+    // Count how many times this IP has saved today for this cloud type
+    const ipCountRow = db.prepare(
+      `SELECT COALESCE(SUM(save_count), 0) as total
+       FROM ip_daily_save_counts
+       WHERE ip_address = ? AND date = ? AND cloud_type = ?`
+    ).get(ipAddress, today, cloudType) as { total: number };
+
+    const ipTodayCount = ipCountRow?.total || 0;
+
+    if (ipTodayCount < 3) {
+      // First 2 saves — use a primary account (is_primary=1), fallback to any healthy
+      config = db.prepare(
+        `SELECT * FROM cloud_configs
+         WHERE cloud_type = ? AND is_active = 1
+         AND consecutive_failures < 5
+         ORDER BY is_primary DESC, last_used_at ASC NULLS FIRST
+         LIMIT 1`
+      ).get(cloudType) as CloudConfig | undefined;
+    } else {
+      // 3rd+ save — exclude accounts this IP has already used today,
+      // fall back to other available accounts round-robin
+      const usedConfigIds = db.prepare(
+        `SELECT DISTINCT config_id FROM ip_daily_save_counts
+         WHERE ip_address = ? AND date = ? AND cloud_type = ?
+         ORDER BY config_id`
+      ).all(ipAddress, today, cloudType) as { config_id: number }[];
+
+      const usedIds = usedConfigIds.map(r => r.config_id);
+      const placeholders = usedIds.length > 0 ? usedIds.map(() => '?').join(',') : '-1';
+
+      config = db.prepare(
+        `SELECT * FROM cloud_configs
+         WHERE cloud_type = ? AND is_active = 1
+         AND consecutive_failures < 5
+         AND id NOT IN (${placeholders})
+         ORDER BY last_used_at ASC NULLS FIRST
+         LIMIT 1`
+      ).get(cloudType, ...usedIds) as CloudConfig | undefined;
+
+      // If all accounts have been used by this IP, fall back to primary
+      if (!config) {
+        config = db.prepare(
+          `SELECT * FROM cloud_configs
+           WHERE cloud_type = ? AND is_active = 1
+           AND consecutive_failures < 5
+           ORDER BY is_primary DESC, last_used_at ASC NULLS FIRST
+           LIMIT 1`
+        ).get(cloudType) as CloudConfig | undefined;
+      }
+    }
+  }
 
   if (!config) {
     return {
@@ -457,6 +546,21 @@ export async function getAndValidateCredential(cloudType: string): Promise<Crede
       };
     }
 
+    // Track IP daily usage count (if ipAddress provided)
+    if (ipAddress && config) {
+      const today = (() => {
+        const now = new Date();
+        const shanghai = new Date(now.toLocaleString('en-US', { timeZone: 'Asia/Shanghai' }));
+        return shanghai.toISOString().slice(0, 10);
+      })();
+      db.prepare(
+        `INSERT INTO ip_daily_save_counts (ip_address, date, cloud_type, config_id, save_count)
+         VALUES (?, ?, ?, ?, 1)
+         ON CONFLICT(ip_address, date, cloud_type, config_id)
+         DO UPDATE SET save_count = save_count + 1`
+      ).run(ipAddress, today, cloudType, config.id);
+    }
+
     return {
       valid: true,
       config: { ...config, cookie: decryptedCookie },

packages/backend/src/database/database.ts

@@ -119,6 +119,16 @@ function runMigrations(db: Database.Database): void {
       source TEXT,
       updated_at TEXT NOT NULL DEFAULT (datetime('now', 'localtime'))
     );
+
+    CREATE TABLE IF NOT EXISTS ip_daily_save_counts (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      ip_address TEXT NOT NULL,
+      date TEXT NOT NULL,
+      cloud_type TEXT NOT NULL,
+      config_id INTEGER NOT NULL,
+      save_count INTEGER NOT NULL DEFAULT 0,
+      UNIQUE(ip_address, date, cloud_type, config_id)
+    );
   `);
   seedSystemConfigs(db);
   migrateSaveRecords(db);
@@ -244,6 +254,13 @@ function migrateCloudConfigs(db: Database.Database): void {
     db.exec("ALTER TABLE cloud_configs ADD COLUMN is_transfer_enabled INTEGER DEFAULT 1");
     console.log('[DB] cloud_configs migration: is_transfer_enabled column added');
   }
+
+  // Migration 6: Add is_primary column (default account, max 2 per cloud type)
+  const row6 = db.prepare("SELECT sql FROM sqlite_master WHERE name='cloud_configs' AND sql LIKE '%is_primary%'").get();
+  if (!row6) {
+    db.exec("ALTER TABLE cloud_configs ADD COLUMN is_primary INTEGER DEFAULT 0");
+    console.log('[DB] cloud_configs migration: is_primary column added');
+  }
 }
 
 function seedAdmin(db: Database.Database): void {
@@ -257,6 +274,12 @@ function seedAdmin(db: Database.Database): void {
     'INSERT INTO admins (username, password_hash) VALUES (?, ?)'
   ).run(config.adminUsername, hash);
 
+  // Migration 6: Add is_primary column (default account, max 2 per cloud type)
+  const row6 = db.prepare("SELECT sql FROM sqlite_master WHERE name='cloud_configs' AND sql LIKE %'is_primary%'").get();
+  if (!row6) {
+    db.exec("ALTER TABLE cloud_configs ADD COLUMN is_primary INTEGER DEFAULT 0");
+    console.log("[DB] cloud_configs migration: is_primary column added");
+  }
   console.log(`[DB] Admin user "${config.adminUsername}" created`);
 }
 

packages/backend/src/routes/admin.routes.ts

@@ -4,7 +4,7 @@ import fs from "fs";
 import { execSync } from 'child_process';
 import { adminLimiter, loginLimiter } from '../middleware/rate-limit';
 import { getSaveRecords } from '../cloud/cloud.service';
-import { getCloudConfigs, getCloudConfigById, saveCloudConfig, deleteCloudConfig, getCloudConfigByType, testCloudConnection, testCloudConnectionWithCookie } from '../cloud/credential.service';
+import { getCloudConfigs, getCloudConfigById, saveCloudConfig, deleteCloudConfig, getCloudConfigByType, testCloudConnection, testCloudConnectionWithCookie, togglePrimary } from '../cloud/credential.service';
 // Note: check-in routes were removed (sign-in feature removed)
 import { getAllCloudTypes } from '../cloud/cloud-types.service';
 import { login, authMiddleware, verifyToken, changePassword } from '../admin/auth.service';
@@ -199,6 +199,20 @@ router.delete('/admin/cloud-configs/:id', (req: Request, res: Response) => {
   }
 });
 
+/**
+ * PUT /api/admin/cloud-configs/:id/primary — toggle primary status (max 2 per type)
+ */
+router.put('/admin/cloud-configs/:id/primary', (req: Request, res: Response) => {
+  try {
+    const id = parseInt(req.params.id as string);
+    const { primary } = req.body;
+    const config = togglePrimary(id, !!primary);
+    res.json(config);
+  } catch (err: any) {
+    res.status(400).json({ error: err.message || 'Failed to toggle primary status' });
+  }
+});
+
 /** POST /api/admin/cloud-configs/:type/test — test cloud connection (by type or id) */
 router.post('/admin/cloud-configs/:type/test', async (req: Request, res: Response) => {
   try {

packages/frontend/src/api/index.ts

@@ -267,6 +267,14 @@ export async function deleteCloudConfig(
   await api.delete(`/admin/cloud-configs/${id}`)
 }
 
+export async function setPrimary(
+  id: number,
+  primary: boolean
+): Promise<any> {
+  const { data } = await api.put(`/admin/cloud-configs/${id}/primary`, { primary })
+  return data
+}
+
 export async function getStats(days?: number): Promise<StatsData> {
   const params: Record<string, number> = {}
   if (days) params.days = days

packages/frontend/src/pages/admin/CloudConfig.vue

@@ -99,6 +99,16 @@
           />
         </template>
       </el-table-column>
+      <el-table-column label="默认账号" width="100" align="center">
+        <template #default="{ row }">
+          <el-switch
+            :model-value="row.is_primary === 1"
+            :disabled="!row.is_transfer_enabled"
+            size="small"
+            @change="(val: boolean) => handleTogglePrimary(row, val)"
+          />
+        </template>
+      </el-table-column>
       <el-table-column label="操作" width="390" align="center">
         <template #default="{ row }">
           <el-button text type="primary" @click="openDialog(row)">编辑</el-button>
@@ -171,7 +181,7 @@ import { Loading } from '@element-plus/icons-vue'
 import { CLOUD_LABELS } from '../../types'
 import type { CloudType, CloudConfig } from '../../types'
 import { ElMessage } from 'element-plus'
-import { getCloudConfigs, saveCloudConfig, updateCloudConfig, deleteCloudConfig, testCloudConnection, getCloudTypes, toggleCloudType } from '../../api'
+import { getCloudConfigs, saveCloudConfig, updateCloudConfig, deleteCloudConfig, testCloudConnection, getCloudTypes, toggleCloudType, setPrimary } from '../../api'
 import CloudBadge from '../../components/CloudBadge.vue'
 import type { ElForm } from 'element-plus'
 
@@ -351,6 +361,16 @@ async function handleToggleTransfer(row: CloudConfig, enabled: boolean) {
   }
 }
 
+async function handleTogglePrimary(row: CloudConfig, enabled: boolean) {
+  try {
+    await setPrimary(row.id!, enabled)
+    row.is_primary = enabled ? 1 : 0
+    ElMessage.success(enabled ? `已将「${row.nickname || row.cloud_type}」设为默认账号` : '已取消默认账号')
+  } catch (e: any) {
+    ElMessage.error(e.response?.data?.error || e.message || '操作失败')
+  }
+}
+
 async function autoVerifyAll() {
   for (const cfg of configs.value) {
     if (cfg.cookie_preview || cfg.nickname) {