isBlocked = async (block_by, user) => {
  let s = await db.query(
    'SELECT COUNT(block_id) AS block_count FROM blocks WHERE block_by=? AND user=?',
    [block_by, user]
  )
  return db.tf(s[0].block_count)
}
Returns whether User is blocked by user
@param {Number} block_by Block By
@param {Number} user User ID