Was wondering what is the smartest way to manage your database:

I have PT3 with postgres database and the database is becoming so big 7gb at the moment that PT3 is really slowing down and so is my computer.
Some people say its better to make a saparate database for observed (datamined) hands. But how will this affect the hud? Like if u set the observed hands database as active will the hud only show the datamined hands etc.?