code: def unsubscribe_user_from_discussion(recID, uid):
      
      query = """DELETE FROM "cmtSUBSCRIPTION"
                       WHERE id_bibrec=%s AND id_user=%s"""
      params = (recID, uid)
      try:
          res = run_sql(query, params)
      except:
          return 0
      if res > 0:
          return 1
      return 0
docs: Unsubscribe users from a discussion.
  
      :param recID: record ID corresponding to the discussion we want to
                    unsubscribe the user
      :param uid: user id
      :return 1 if successful, 0 if not