Add support for multiple instances of the same notifier type

internal/domain/notification.go

@@ -44,6 +44,10 @@ type Notification struct {
 	// Type specifies which notifier should handle this notification
 	Type NotificationType `json:"type"`
 
+	// Account specifies which named account/instance to use for this notifier type (optional)
+	// If not specified, the default account for the notifier type will be used
+	Account string `json:"account,omitempty"`
+
 	// Priority determines urgency and retry behavior
 	Priority Priority `json:"priority"`
 

internal/domain/notifier.go

@@ -21,14 +21,18 @@ type Notifier interface {
 
 // NotifierFactory creates notifier instances based on configuration
 type NotifierFactory interface {
-	// Create creates a notifier for the given type
-	Create(notificationType NotificationType) (Notifier, error)
+	// Create creates a notifier for the given type and account
+	// If account is empty, the default account for the type will be used
+	Create(notificationType NotificationType, account string) (Notifier, error)
 
 	// RegisterNotifier registers a custom notifier implementation
-	RegisterNotifier(notificationType NotificationType, notifier Notifier) error
+	RegisterNotifier(notificationType NotificationType, account string, notifier Notifier) error
 
 	// SupportedTypes returns all supported notification types
 	SupportedTypes() []NotificationType
+
+	// GetAccounts returns all registered accounts for a given notification type
+	GetAccounts(notificationType NotificationType) []string
 }
 
 // NotificationService is the high-level service interface for managing notifications