1.3.9a

**MAJOR UPDATE**

- New database schema
- Added `css_admins_flags` table
- Added `css_unmutes` table
- Added `css_unbans` table

Database/Migration.cs

@@ -0,0 +1,64 @@
+using Microsoft.Extensions.Logging;
+using MySqlConnector;
+
+namespace CS2_SimpleAdmin;
+
+public class Migration(Database database)
+{
+	private readonly Database _database = database;
+
+	public void ExecuteMigrations()
+	{
+		string migrationsDirectory = CS2_SimpleAdmin.Instance.ModuleDirectory + "/Database/Migrations";
+
+		var files = Directory.GetFiles(migrationsDirectory, "*.sql")
+							 .OrderBy(f => f);
+
+		using MySqlConnection connection = _database.GetConnection();
+
+		// Create sa_migrations table if not exists
+		using var cmd = new MySqlCommand(@"
+            CREATE TABLE IF NOT EXISTS `sa_migrations` (
+                `id` INT PRIMARY KEY AUTO_INCREMENT,
+                `version` VARCHAR(255) NOT NULL
+            );", connection);
+
+		cmd.ExecuteNonQuery();
+
+		// Get the last applied migration version
+		var lastAppliedVersion = GetLastAppliedVersion(connection);
+
+		foreach (var file in files)
+		{
+			var version = Path.GetFileNameWithoutExtension(file);
+
+			// Check if the migration has already been applied
+			if (string.Compare(version, lastAppliedVersion, StringComparison.OrdinalIgnoreCase) > 0)
+			{
+				var sqlScript = File.ReadAllText(file);
+
+				using var cmdMigration = new MySqlCommand(sqlScript, connection);
+				cmdMigration.ExecuteNonQuery();
+
+				// Update the last applied migration version
+				UpdateLastAppliedVersion(connection, version);
+
+				CS2_SimpleAdmin._logger?.LogInformation($"Migration \"{version}\" successfully applied.");
+			}
+		}
+	}
+
+	private static string GetLastAppliedVersion(MySqlConnection connection)
+	{
+		using var cmd = new MySqlCommand("SELECT `version` FROM `sa_migrations` ORDER BY `id` DESC LIMIT 1;", connection);
+		var result = cmd.ExecuteScalar();
+		return result?.ToString() ?? string.Empty;
+	}
+
+	private static void UpdateLastAppliedVersion(MySqlConnection connection, string version)
+	{
+		using var cmd = new MySqlCommand("INSERT INTO `sa_migrations` (`version`) VALUES (@Version);", connection);
+		cmd.Parameters.AddWithValue("@Version", version);
+		cmd.ExecuteNonQuery();
+	}
+}