create table emr_applications (
  key text primary key not null,
  created_at timestamptz not null default now()
);

insert into emr_applications (key) values ('Hadoop');
insert into emr_applications (key) values ('Hive');
insert into emr_applications (key) values ('Mahout');
insert into emr_applications (key) values ('Pig');
insert into emr_applications (key) values ('Spark');
insert into emr_applications (key) values ('Ganglia');