Add MariaDB as separate selectable database type in interactive mode

internal/tui/menu.go

@@ -69,12 +69,15 @@ func NewMenuModel(cfg *config.Config, log logger.Logger) MenuModel {
 
 	dbTypes := []dbTypeOption{
 		{label: "PostgreSQL", value: "postgres"},
-		{label: "MySQL / MariaDB", value: "mysql"},
+		{label: "MySQL", value: "mysql"},
+		{label: "MariaDB", value: "mariadb"},
 	}
 
 	dbCursor := 0
-	if cfg.IsMySQL() {
+	if cfg.DatabaseType == "mysql" {
 		dbCursor = 1
+	} else if cfg.DatabaseType == "mariadb" {
+		dbCursor = 2
 	}
 
 	model := MenuModel{

internal/tui/settings.go

@@ -57,8 +57,8 @@ func NewSettingsModel(cfg *config.Config, log logger.Logger, parent tea.Model) S
 			Update: func(c *config.Config, v string) error {
 				return c.SetDatabaseType(v)
 			},
-			Type:        "string",
-			Description: "Target database engine (postgres, mysql, mariadb)",
+			Type:        "selector",
+			Description: "Target database engine (press Enter to cycle: PostgreSQL → MySQL → MariaDB)",
 		},
 		{
 			Key:         "backup_dir",
@@ -309,6 +309,10 @@ func (m SettingsModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			}
 
 		case "enter", " ":
+			// For database_type, cycle through options instead of typing
+			if m.cursor >= 0 && m.cursor < len(m.settings) && m.settings[m.cursor].Key == "database_type" {
+				return m.cycleDatabaseType()
+			}
 			return m.startEditing()
 
 		case "tab":
@@ -454,6 +458,33 @@ func (m SettingsModel) saveSettings() (tea.Model, tea.Cmd) {
 	return m, nil
 }
 
+// cycleDatabaseType cycles through database type options
+func (m SettingsModel) cycleDatabaseType() (tea.Model, tea.Cmd) {
+	dbTypes := []string{"postgres", "mysql", "mariadb"}
+	
+	// Find current index
+	currentIdx := 0
+	for i, dbType := range dbTypes {
+		if m.config.DatabaseType == dbType {
+			currentIdx = i
+			break
+		}
+	}
+	
+	// Cycle to next
+	nextIdx := (currentIdx + 1) % len(dbTypes)
+	newType := dbTypes[nextIdx]
+	
+	// Update config
+	if err := m.config.SetDatabaseType(newType); err != nil {
+		m.message = errorStyle.Render(fmt.Sprintf("❌ Failed to set database type: %s", err.Error()))
+		return m, nil
+	}
+	
+	m.message = successStyle.Render(fmt.Sprintf("✅ Database type set to %s", m.config.DisplayDatabaseType()))
+	return m, nil
+}
+
 // View renders the settings interface
 func (m SettingsModel) View() string {
 	if m.quitting {