private async Task <MigrationPlan <TMigrationVersion, TMigrationInfo> > GetPlanForNonAppliedMigrationsInternal(Assembly[] assembliesContainingMigrations,
CancellationToken cancellationToken)
{
await using var session = await SessionFactory.CreateSessionForRetrievingAllMigrationInfosAsync(cancellationToken);
var appliedMigrationInfos = await session.GetAllMigrationInfosAsync(cancellationToken);
var(infoWithHighestVersion, allVersions) = appliedMigrationInfos.ExtractMigrationVersions <TMigrationInfo, TMigrationVersion>();
var migrationToBeApplied = assembliesContainingMigrations.DetermineNonAppliedMigrations <TMigrationVersion, TMigration, TMigrationAttribute>(allVersions);
return(new MigrationPlan <TMigrationVersion, TMigrationInfo>(infoWithHighestVersion, migrationToBeApplied));
}