tauri-plugin-sql: How to use "Down" migrations?

In the SQL plugin, how do I run the "Down" migrations? What are all of the situations in which these will be ran (uninstall, manually, etc)?

For example:
```
Migration {
version: 2,
description: "drop_service_table",
sql: "DROP TABLE service",
kind: MigrationKind::Down,
}
```