We are aware of Gremlins in the system of dtdb.co. Gomorra’s finest are working on restoring the database!
Two options for the moment for alternatives. Go to board game geek, search for Doomtown Reloaded, files section, there is an excel spreadsheet there with all the current cards in it.
Second you can go to PBE forums, search Doomtown Card Explorer and there’s a windows card database program in a post there. On my phone atm, can’t give a more detailed link.
Either should get you the info you want until Dtdb comes back.