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DELETE FROM images WHERE id = 'gradient';
INSERT INTO images (id, width, height) VALUES ('gradient', 200, 200) RETURNING id;
WITH RECURSIVE
image AS (SELECT * FROM images WHERE id = 'gradient'),
horizontal(x) AS
(SELECT width FROM image UNION ALL SELECT x - 1 FROM horizontal WHERE x > 1),
vertical(y) AS
(SELECT height FROM image UNION ALL SELECT y - 1 FROM vertical WHERE y > 1),
_pixels(x, y, r, g, b) AS
(SELECT x, y, mod(x, 255), mod(y, 255), 100 FROM vertical, horizontal)
INSERT INTO pixels (image_id, x, y, r, g, b) SELECT 'gradient', x, y, r, g, b FROM _pixels;
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