I pretty much like Mesosim where it's 'codable', and has all the bells and whistles of a backtesting tool. The only issue I have is that they only have a few tickers to trade. Are there any tools out there, that gives of a backtest like Mesosim, but I could use my own data? Like from Polygon/Theta/ORATs etc where I could export the CSVs or something.
Or if I may be lucky enough, have thousands of tickers available to trade directly?