What did you have in mind? I don't really use any else personally. I do have a Kofi account not sure if that helps, but please don't feel obligated to donate. EDIT: Ok I see what you meant, I didn't realise the direct payout limited users to paypal(since I don't have a Stripe account), I have changed that.
There isn't anything as complicated as SQL for the databases(they are all basically json files), this is mainly to allow users to easily see how things are done and to add to them.
I am also not sure what you mean about the duplicate girl names or the complete shoots. In 0.3 the game won't load girls with matching "id", it will just load their content along side. As for the completed shoots it does add the shoot name to the list of completed shoots. If I misunderstood please let me know.