fix(lint): fix errcheck and staticcheck issues

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: dorothyyzh

ratelimiter_test.go

@@ -52,7 +52,7 @@ func TestMain(m *testing.M) {
 	redisCli = redis.NewClient(&redis.Options{
 		Addr: strings.TrimPrefix(endpoint, "redis://"),
 	})
-	defer redisCli.Close()
+	defer func() { _ = redisCli.Close() }()
 
 	// Create SQL rate limiter and migrate table
 	sqlLimiter, err := sqlrl.New(db, "kvs")

redisrl/redis_test.go

@@ -34,7 +34,7 @@ func TestMain(m *testing.M) {
 	redisClient = redis.NewClient(&redis.Options{
 		Addr: strings.TrimPrefix(endpoint, "redis://"),
 	})
-	defer redisClient.Close()
+	defer func() { _ = redisClient.Close() }()
 
 	m.Run()
 }

sqlrl/sql.go

@@ -53,13 +53,13 @@ func New(db *gorm.DB, tableName string) (*RateLimiter, error) {
 	// Build raw query based on database type
 	// Prioritize real-time accuracy for precise rate limiting
 	var currentTimestampQuery string
-	switch db.Dialector.Name() {
+	switch db.Name() {
 	case "mysql":
 		currentTimestampQuery = "SYSDATE(6)" // MySQL: real-time timestamp with microsecond precision
 	case "postgres":
 		currentTimestampQuery = "clock_timestamp()" // PostgreSQL: real-time timestamp for maximum accuracy
 	default:
-		return nil, errors.Errorf("unsupported dialect %q, must be mysql or postgres", db.Dialector.Name())
+		return nil, errors.Errorf("unsupported dialect %q, must be mysql or postgres", db.Name())
 	}
 
 	s.selectQuery = fmt.Sprintf(`