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Use a granular enum rather than `type: string`, so clients can choose stable icons, colors, routing, and behavior without guessing arbitrary values.
```ts
export enum NotificationType {
APPOINTMENT_REMINDER = 'APPOINTMENT_REMINDER',
MESSAGE_RECEIVED = 'MESSAGE_RECEIVED',
PAYMENT_FAILED = 'PAYMENT_FAILED',
}
export class NotificationEntity {
@Column({ type: 'enum', enum: NotificationType })
type!: NotificationType;
}
```
Keep routing metadata as a typed domain object in application code, serialize it as JSON for database storage if needed, and map it to flat string-only FCM data. Version or carefully extend the enum because mobile clients may lag behind the server.
