"UPDATE table_name SET w = $1, x = $2, y = $4 WHERE z = $3 RETURNING *",

does not do the same as

"UPDATE table_name SET w= $1, x= $2, y = $3, z = $4 RETURNING *",

It’s 2 am and my mind blanked out the WHERE, and just wanted the numbers neatly in order of 1234.

idiot.

FML.