feat: Add MySQL database support (#3024)MySQL-databases

* feat: Add MySQL database support

- Add MySQL database support with environment-based configuration
- Fix MySQL compatibility issue with 'key' column name
- Maintain SQLite as default database
- Add proper validation for MySQL configuration
- Test and verify compatibility with existing database
- Replaced raw SQL queries using JSON_EACH functions with standard GORM queries
- Modified functions to handle JSON parsing in Go code instead of database since JSON_EACH is not available on MySQL or MariaDB:
  - getAllEmails()
  - GetClientTrafficByID()
  - getFallbackMaster()
  - MigrationRemoveOrphanedTraffics()

The system now supports both MySQL and SQLite databases, with SQLite remaining as the default option. MySQL connection is only used when explicitly configured through environment variables.

* refactor: prefix env variables of database with XUI_ to support direct environment usage without .env file

All database configuration environment variables now start with the XUI_ prefix to avoid conflicts and allow configuration via system-level environment variables, not just the .env file.

1 files changed, 1 insertions, 0 deletions

diff --git a/main.go b/main.go
index dcbd3c9e..a19e4760 100644
--- a/main.go
+++ b/main.go
@@ -105,6 +105,7 @@ func runWebServer() {
 		default:
 			server.Stop()
 			subServer.Stop()
+			database.CloseDB()
 			log.Println("Shutting down servers.")
 			return
 		}