Database

Migrations

If you are making changes to the database schema (in the engine or the knowledge module), you need to consider how applications with Android FHIR SDK dependencies can upgrade to the new schema without losing or corrupting existing data already on device. This can be done with Room database migration.

!!! tip A new JSON schema file will be generated under the schemas folder in the module when you update the database version. If you are having trouble with this, make sure you run the gradle command with --rerun-tasks:

```sh
./gradlew :<module>:build --rerun-tasks
```