/opt/carto/builder-tools/embedded/bin/carto-builder-feature-flags.sh enable all ghost_tables

curl -v -k -X GET https://username.carto.com/user/mbpskt/api/v2/sql?q='CREATE+TABLE+usertable+(+cartodb_id+INTEGER+)'&api_key='key'

SELECT cdb_cartodbfytable('username','username.usertable');