完善数据库备份恢复链路

.env.server.example

@@ -57,6 +57,19 @@ STORAGE_OSS_ACCESS_KEY_ID=change-me-oss-access-key
 STORAGE_OSS_SECRET_ACCESS_KEY=change-me-oss-secret-key
 STORAGE_OSS_REGION=oss-cn-hangzhou
 
+# 数据库备份 → OSS(deploy/backup-db.sh 与 dist/db-backup.js 使用)。
+# 默认复用上面的 STORAGE_OSS_* 上传到同桶 backups/ 前缀,以下仅需按需调整。
+DB_BACKUP_OSS_PREFIX=backups/postgres
+# 服务器本地保留的备份份数(OSS 端过期请配置桶生命周期规则)
+DB_BACKUP_KEEP=7
+# 建议为备份单独创建 RAM 用户、只授予 backups/ 前缀权限(策略见 docs/数据库备份与恢复.md);
+# 使用独立桶/密钥时取消注释覆盖:
+# DB_BACKUP_OSS_ENDPOINT=https://oss-cn-hangzhou-internal.aliyuncs.com
+# DB_BACKUP_OSS_BUCKET=change-me-backup-bucket
+# DB_BACKUP_OSS_ACCESS_KEY_ID=change-me-backup-access-key
+# DB_BACKUP_OSS_SECRET_ACCESS_KEY=change-me-backup-secret-key
+# DB_BACKUP_OSS_REGION=oss-cn-hangzhou
+
 # Admin
 ADMIN_SESSION_SECRET=change-me-long-random-session-secret
 ADMIN_DEFAULT_USERS_JSON=[{"username":"admin","password":"change-me-admin-password","role":"admin"},{"username":"operator","password":"change-me-operator-password","role":"operator"}]