title: Best way to index two "timestamp" columns
body: <p>How i should index two <code>timestamp</code> columns (ie <code>starts_at</code> and <code>ends_at</code>), which would be used almost always together in queries (like <code>starts_at &gt;= ? AND ends_at &lt;= ?</code>)? Create composite index for both columns or index each one separatly?</p>
  
  <p>Btw, i'm using Postgres, if it matters :)</p>