title: Unable to delete PostgreSQL role
body: <p>Yesterday I created a user to make backups from PostgreSQL. I granted select to this user and then I noticed that the name was not well written. The problem is that I tried to erase the user using the command line and the response was, due to the grants that I made a few moments back:</p>
  
  <blockquote>
  <pre><code>ERROR:  role "dump_user" cannot be dropped because some objects depend on it
  </code></pre>
  </blockquote>
  
  <p>Long story short, I erased this user using pgadmin and now I have problems because when I want to create a new table, it tells:</p>
  
  <blockquote>
  <pre><code>ERROR:  role 313898229 was concurrently dropped
  </code></pre>
  </blockquote>
  
  <p>I cheked and 313898229 was the oid of this dump_user in the pg_authid table, I tried to create a new user and assign this oid, but postgres says that I can't modify system id "oid".</p>
  
  <p>Is there a way that I can permanently erase this user?</p>