Add new wifi to wpa_supplicant instead of replace

[Golgomaph]

Hi,

i wonder if you can help me with a "special feature". Although it works great so far i need to be able to save seperate wifi's in the wpa_supplicant instead of only one.

At the moment when teaching a new wifi via HTTP Server the older one which isn't in use currently will be deleted and instead the new credentials will be pasted.

I wish the older credentials would be saved and the new ones simply added below. So the raspi will look at the available credentials after start and check if any of them gives him a internet connection.
If not, it opens the hotspot.

Maybe, after some time the wpa_supplicant will be full of "old" credentials nobody needs for, but that shouldnt be a huge problem, does it?