fix: 设置 MySQL 连接时区为 Asia/Shanghai 确保前端时间显示东八区

internal/db/db.go

@@ -13,7 +13,7 @@ import (
 var DB *sql.DB
 
 func Init(cfg *config.Config) error {
-	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=true&loc=Local",
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=true&loc=Asia%%2FShanghai",
 		cfg.DBUser, cfg.DBPassword, cfg.DBHost, cfg.DBPort, cfg.DBName)
 
 	var err error
@@ -26,6 +26,11 @@ func Init(cfg *config.Config) error {
 		return fmt.Errorf("failed to ping database: %w", err)
 	}
 
+	// 确保 MySQL session 时区为 UTC+8
+	if _, err = DB.Exec("SET time_zone = '+08:00'"); err != nil {
+		log.Printf("Warning: failed to set MySQL time_zone to +08:00: %v", err)
+	}
+
 	DB.SetMaxOpenConns(25)
 	DB.SetMaxIdleConns(5)