I think this may be a tricky one for you. Are you intending this to be a new product to compete with the likes of OpenTable, ResDiary, etc? Or an add-on to try and sell to those companies. Either way - good luck.
I think the tricky bit will come from designing a product which fits for differing jurisdictions. The regulations applying to restaurants may be different where I am in the world, from where you are in the world. If you were hoping to develop a product for, say, OpenTable then that company operates across many countries. I use the company not only at home but find it a great benefit when I’m planning to make a reservation at a restaurant in a country that may be several time zones away, or where I may struggle to communicate in the local language.
Where I am, restaurants have been allowed to open now for several weeks. And, of course, they all have to comply with the same regulations but there are different interpretations of how compliance can be achieved. For example, the over-arching distance rule is a 2M gap between tables. However, places are allowed to operate at 1M distance, so long as they have instituted other procedures. And its the variety of other procedures that I suspect makes it tricky for you to design. For example, how to compare a restaurant which, say, installs perspex screens between some of its tables, but the staff don’t wear masks with a place where staff are masked and deliver food/drink to the edge of your table, on a tray for you to take yourself. Had both of those in recent weeks. I suppose it could be a “tick box” arrangement but I’m not sure quite how helpful that would be.
By the by, where I am the government supported a restaurant discount scheme during August, as a way of kick-starting a return to opening. It was, apparently a roaring success with many local restaurants saying they had had their best ever nights. It’ll be interesting to see if it has actually provided a kick-start or if folk only went out to dinner because of the discount.