Is there a database of every scientist with their scientific interests? Is there an open database of every scientist with their scientific interests? For example, I want to find a list of all scientists with their contact details based in the UK, whose scientific interests include, say, databases. I have an idea and I would like to approach some of them with it.

Edit: such database does exist, I used it almost 10 years ago for different reasons, cannot remember its website anymore :(
I don't think this database exists, but you might try searching the literature archives. Databases like Web of Science might help you.