title: hasura - to call an http service api and insert the response into postgresql
body: <p>I've already made an <code>action</code> of type <code>query</code> that calls an http endpoint and return a list of results.</p>
  <p>Then i should insert this resut into the postgresql (i suppose through a mutation).
  So, how can i join this insert mutation to the previus query result, and eventually apply some custom logic (eg: not insert the already present records)</p>