[isatrader]

I presume you have your own database then?  At some point I found it more flexible for individual stocks to calculate this sort of data on the fly.  But, then calculating the market breadth is slower as you have to keep recalculating the data for every stock in the breadth pool.  The problem I had hit with carrying out all the calculations and then storing them was that (I was using python) that the  calculations of the various parameters, per stock, were taking too long to calculate and store in the database.  But perhaps serious speedups were possible?

Yep, we have a cloud server setup that will be pulling in the data each day into the screener. But just trying to sort out the data provider, as for commercial use the data can be very expensive each month. So trying to find a provider that is reasonable that will provide the adjusted daily and weekly data, plus sector and group info.

Here's an example of what the charts will look like. Each stock will have it's own page.