title: What is for contrib_regression DB in Postgres DBs list?
body: <p>I ran 2 commands</p>
  <pre><code>psql -U postgres
  </code></pre>
  <p>and</p>
  <pre><code>postgres=# \l
  </code></pre>
  <p>and then I saw</p>
  <pre><code>     List of databases
          Name        | Owner  | Encoding |   Collate   |    Ctype    | Access privileges 
  --------------------+--------+----------+-------------+-------------+-------------------
   contrib_regression | spuser | UTF8     | C           | C           | 
  </code></pre>
  <p>I'm interested in purpose of <code>contrib_regression</code> DB.
  All that I could google a mention of it <a href="https://www.postgresql.org/docs/13/contrib-dblink-get-result.html" rel="nofollow noreferrer">https://www.postgresql.org/docs/13/contrib-dblink-get-result.html</a></p>
  <p>However, there is no explanation of <code>contrib_regression</code>.</p>