Millistel juhtudel tuleks andmete ülekandmist teha erinevate mudelite või andmebaaside vahel?

Data transfer between different models or databases is usually necessary in the following cases:

• Data migration when updating the application: when the data model structure changes, for example, by adding new fields or changing the storage logic, it is necessary to transfer old data to the new model.
• Switching to another database or storage technology: if the application switches from one type of database to another (e.g., from SQLite to Core Data or Realm), existing data must be transferred.
• Integration of data from different sources: when integrating multiple applications or services, where data is stored in different databases.
• Performance optimization: splitting data into different models or databases to reduce load and speed up access.

For example, on iOS, when using Core Data, data migration occurs through migration policies that allow automatic or manual transfer of data between model versions.