feat(blockchain): 添加 Redis 缓存自动恢复机制

扫描区块时检测缓存是否为空，如果为空则自动从数据库重新加载地址缓存，
避免因 Redis 数据丢失导致充值漏检。

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/blockchain-service/src/application/services/deposit-detection.service.ts

@@ -94,6 +94,15 @@ export class DepositDetectionService implements OnModuleInit {
    * 扫描单条链
    */
   private async scanChain(chainType: ChainType): Promise<void> {
+    // 检查缓存是否为空，如果为空则自动从数据库重新加载
+    const cacheCount = await this.addressCache.getCount(chainType);
+    if (cacheCount === 0) {
+      this.logger.warn(`Address cache empty for ${chainType}, reloading from database...`);
+      const addresses = await this.monitoredAddressRepo.getAllActiveAddresses(chainType);
+      await this.addressCache.reloadCache(chainType, addresses);
+      this.logger.log(`Reloaded ${addresses.length} addresses for ${chainType} into cache`);
+    }
+
     // 获取上次扫描位置
     let lastBlock = await this.checkpointRepo.getLastScannedBlock(chainType);
 

backend/services/blockchain-service/src/infrastructure/redis/address-cache.service.ts

@@ -66,6 +66,15 @@ export class AddressCacheService implements OnModuleInit {
     return this.redis.smembers(key);
   }
 
+  /**
+   * 获取监控地址数量
+   */
+  async getCount(chainType: ChainType): Promise<number> {
+    const key = this.getCacheKey(chainType);
+    const client = this.redis.getClient();
+    return client.scard(key);
+  }
+
   /**
    * 重新加载缓存（从数据库）
    */