Ouch. Sorry to hear that. I hope your fee included the work you did in Fmp solving the SQL needed to generate your “free” solution.
Though it isn’t really free. There is hosting costs, you may need to charge by db and/or by space. Also maintainence and networking.
Probably a separate topic; one of the reasons we can no longer provide shared hosting is that the security of the shared spaces in an FMS environment is next to zero. The documents folder and tmp are accessible to users.