Comment 2 for bug 2713

This should help:

 Column | Type | Modifiers
--------+---------+-----------------------------------------------------------------
 id | integer | not null default nextval('public.bugsubscription_id_seq'::text)
 person | integer | not null
 bug | integer | not null
Indexes:
    "bugsubscription_pkey" primary key, btree (id)
    "bugsubscription_bug_idx" btree (bug)
    "bugsubscription_person_idx" btree (person)
Foreign-key constraints:
    "$2" FOREIGN KEY (bug) REFERENCES bug(id)
    "$1" FOREIGN KEY (person) REFERENCES person(id)