I wouldn't waste my time adding parts, if the website has no way of downloading the "database". A basic json export, a csv, anything, a weekly backup would be fine.
Lots of websites come and go, and your website will only be up as long as you're willing to pay for the domain name.
One could spend maybe half an hour in Python to load the json/csv in memory (or convert it to a sqlite database) and do a quick search, without having to use the website.
Didn't get to the add part because you need to sign up so I don't know what can you enter. Hopefully one can enter category like "ldo", "switching regulator" , "opamp" etc and one or several packages.
The ability to filter by category (or at the very least group and move to front the parts which are that category) when you're sure it's a switching regulator for example, or by pin count would be a bonus.
Went through some sites searching for things like "1A" when I had a mosfet with "1A=2C" written on it, and the first website I used dumped 50 linear regulators and "voltage detector ICs" but wouldn't allow me to specify that it's a 6 pin part, and most likely a mosfet/power stage (mosfets + drivers built in)