{
	"author": "Jim Harney",
	"description": "adding pk constraint to users",
	"created_at": 1461858496530,
	"up": [
    "alter table users change column id id varchar(255) not null default '' first;",
    "alter table users add primary key (id);"
	],
	"down": [
    "alter table users drop primary key;",
    "alter table users change column id id varchar(255) null;"
	]
}