github.com/dynastymasra/migrate/v4@v4.11.0/database/mongodb/examples/migrations (about) 001_create_user.down.json 001_create_user.up.json 002_create_indexes.down.json 002_create_indexes.up.json 003_add_new_field.down.json 003_add_new_field.up.json 004_replace_field_value_from_another_field.down.json 004_replace_field_value_from_another_field.up.json