MigrationConfig

The user-authored form of a single migration — an entry of MigrationPackageConfig.migrations, or the shape of a migration.json/migration.ts manifest file. Resolving it produces a Migration.

Property	Type	Required	Description
version	number	yes	Migration version number. Must be unique within the package; migrations run in ascending order regardless of declaration order.
backup	boolean	no	When true on any migration in the package, DbMigrator.execute() emits backup and calls backupDatabase() before applying migrations. No bundled adapter implements a backup, so since v6.3.0 the base adapter rejects this and the run fails rather than proceeding unprotected; up to v6.2.1 it was accepted and did nothing. See Running Migrations.
tasks	(string | MigrationTask | (() => MigrationTask) | (() => Promise<MigrationTask>))[]	yes	Tasks to run for this version — a glob pattern matching *.task.sql/*.task.json files, an inline task object, or a (sync or async) function returning one.

migration.json

{
  "version": 13,
  "tasks": ["*"]
}

MigrationTask is a union of SqlScriptMigrationTask, InsertDataMigrationTask, and CustomMigrationTask. See Writing Migration Tasks.