sqlmigration

type Plan struct {
	// Label is a short, human-readable identifier ("storage",
	// "event outbox", ...). Used as the error prefix.
	Label string
	// Kind is the database dialect.
	Kind config.DBKind
	// Scripts is the embedded SQL bundle. Run looks up
	// "scripts/<kind>.sql" within this FS.
	Scripts embed.FS
	// ExpectedTables names every table the migration must end up with.
	// The migration is skipped when all of them already exist.
	ExpectedTables []string
	// Pre is an optional list of steps that run before the
	// needs-migration probe (e.g. dropping obsolete tables left over
	// from earlier schema revisions). Each hook should be idempotent.
	Pre []func(ctx context.Context, db orm.DB) error
}