improve(db):优化数据库链接

internal/cmd/cmd.go

@@ -49,6 +49,12 @@ var (
 				return err
 			}
 
+			// Health check: Redis
+			if err := checkRedis(ctx); err != nil {
+				g.Log().Fatalf(ctx, "Redis 连接检查失败，程序退出: %v", err)
+			}
+			g.Log().Info(ctx, "Redis 连接正常")
+
 			// Initialize JWT secret
 			common.InitJWTSecret(ctx)
 

internal/cmd/cmd_migrate.go

@@ -81,3 +81,13 @@ func runAutoMigrate(ctx context.Context) error {
 	g.Log().Info(ctx, "数据库迁移完成")
 	return nil
 }
+
+// checkRedis verifies Redis connectivity at startup with a PING command.
+// Returns error if Redis is unreachable, causing the program to exit (FATA).
+func checkRedis(ctx context.Context) error {
+	_, err := g.Redis().Do(ctx, "PING")
+	if err != nil {
+		return fmt.Errorf("Redis PING 失败: %w", err)
+	}
+	return nil
+}

internal/logic/common/config.go

@@ -310,20 +310,28 @@ func (s *ConfigService) Warmup(ctx context.Context) {
 // Called once at startup in cmd.go.
 func (s *ConfigService) StartSubscriber(ctx context.Context) {
 	go func() {
+		var reconnectCount int
 		for {
 			conn, _, err := g.Redis().Subscribe(ctx, "settings:changed")
 			if err != nil {
-				g.Log().Errorf(ctx, "settings subscriber connect failed: %v", err)
+				reconnectCount++
+				g.Log().Warningf(ctx, "[PubSub:settings] 连接失败 (第%d次): %v", reconnectCount, err)
 				time.Sleep(5 * time.Second)
 				continue
 			}
 
-			g.Log().Info(ctx, "settings Pub/Sub subscriber started")
+			if reconnectCount > 0 {
+				g.Log().Infof(ctx, "[PubSub:settings] 重连成功 (此前失败%d次)", reconnectCount)
+				reconnectCount = 0
+			} else {
+				g.Log().Info(ctx, "[PubSub:settings] 订阅已启动")
+			}
 
 			for {
 				v, err := conn.Receive(ctx)
 				if err != nil {
-					g.Log().Warningf(ctx, "settings subscriber recv error: %v", err)
+					reconnectCount++
+					g.Log().Warningf(ctx, "[PubSub:settings] 接收错误 (第%d次): %v", reconnectCount, err)
 					time.Sleep(5 * time.Second)
 					break // reconnect
 				}
@@ -337,7 +345,7 @@ func (s *ConfigService) StartSubscriber(ctx context.Context) {
 				s.cache.Delete(ctx, key)
 				s.cache.Delete(ctx, "public_options")
 				s.cache.Delete(ctx, "category:"+getCategoryForKey(key))
-				g.Log().Debugf(ctx, "settings invalidated via Pub/Sub: %s", key)
+				g.Log().Debugf(ctx, "[PubSub:settings] 缓存已失效: %s", key)
 			}
 
 			conn.Close(ctx)

internal/logic/common/content_filter.go

@@ -181,20 +181,28 @@ func (e *ContentFilterEngine) GetMode() string {
 // startSubscriber subscribes to Redis Pub/Sub "settings:changed" channel
 // and rebuilds the matcher when content filter settings change.
 func (e *ContentFilterEngine) startSubscriber(ctx context.Context) {
+	var reconnectCount int
 	for {
 		conn, _, err := g.Redis().Subscribe(ctx, "settings:changed")
 		if err != nil {
-			g.Log().Errorf(ctx, "[ContentFilter] subscriber connect failed: %v", err)
+			reconnectCount++
+			g.Log().Warningf(ctx, "[PubSub:content_filter] 连接失败 (第%d次): %v", reconnectCount, err)
 			time.Sleep(5 * time.Second)
 			continue
 		}
 
-		g.Log().Info(ctx, "[ContentFilter] Pub/Sub subscriber started")
+		if reconnectCount > 0 {
+			g.Log().Infof(ctx, "[PubSub:content_filter] 重连成功 (此前失败%d次)", reconnectCount)
+			reconnectCount = 0
+		} else {
+			g.Log().Info(ctx, "[PubSub:content_filter] 订阅已启动")
+		}
 
 		for {
 			v, err := conn.Receive(ctx)
 			if err != nil {
-				g.Log().Warningf(ctx, "[ContentFilter] subscriber recv error: %v", err)
+				reconnectCount++
+				g.Log().Warningf(ctx, "[PubSub:content_filter] 接收错误 (第%d次): %v", reconnectCount, err)
 				time.Sleep(5 * time.Second)
 				break // reconnect
 			}
@@ -208,7 +216,7 @@ func (e *ContentFilterEngine) startSubscriber(ctx context.Context) {
 			switch key {
 			case "content_filter_words", "content_filter_mode", "content_filter_replacement":
 				e.Rebuild(ctx)
-				g.Log().Infof(ctx, "[ContentFilter] rebuilt via Pub/Sub for key: %s", key)
+				g.Log().Infof(ctx, "[PubSub:content_filter] 已重建过滤器: %s", key)
 			}
 		}