No DEFERRABLE Constraint option

[anonymouz4]

Currently it isn't possible to declare a constraint, while making it DEFERRABLE or set a initial deferred state.

Workaround 1:

guard let db = database as? PostgresDatabase else {
	throw Abort(.internalServerError)
}
try db.simpleQuery("ALTER TABLE waitlist ADD  CONSTRAINT no_duplicate_ranks UNIQUE(waitlist_rank) DEFERRABLE;").wait()

Workaround 2:

// In create migration
.constraint(.custom("CONSTRAINT \"no_duplicate_ranks\" UNIQUE(waitlist_rank) DEFERRABLE"))