How can I control proxy usage?

Question

Database design

There is a table mb_proxyin which the list of IP are stored.
I need to control whether a certain IP is currently used or not, I created a column Usedin which I write 0 or 1 depending on the situation, but now I'm faced with the fact that I have 5 sites for which I use a proxy and the problem is this :
If I set Usedit to 1, then one of the sites (there may be 5, 6 or more) uses this IP for a curl request, and it turns out that the other 5 sites will wait, but I want to somehow indicate which specifically, the site uses this IP at the current time, so that with further selection from the database, I can take the same IP for requests on other sites.
Create 5 columns in the database and mark for eachUSEDit is possible, but somehow not practical, if there are more sites, creating 50 columns is stupid.
With a select query, I have a query to 2 tables, I think it will not be very beautiful to create a 3rd one either. In the 2nd table, I have IP records from which requests have already been made (request history to control limit limits). Are there any other solutions?

Answer 1

5 sites, 5 proxies === hardcode for each site 1
proxy