To get a list of running SQL queries, log into the PostgreSQL CLI:
psql -U username database
Replace username and database with the proper values. Then run this query:
SELECT procpid,datname,usename,client_addr,waiting,query_start,current_query FROM pg_stat_activity;
Inside the list is also the procpid, which you will need to kill a running query. To kill, run this query, substituting with the proper procpid:
Send a link to this post to yourself or a friend.