How much is it appropriate to jump out of the trough and get a raise? How much is appropriate? Is there a website where I can query the salary of enterprises?

First of all, look at the position applied for and the salary set by the employer for the recruitment position;

Second, look at personal ability, (work experience, education, certificate, dealing with people, etc. );

Third, whether it is suitable or not depends on your own needs!

Fourth, ask the salary of peers, and you will know!