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INSERT OR REPLACE INTO images (id, width, height) VALUES ('gradient', 400, 400) 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, x*255/width, y*255/height, 100 FROM vertical, horizontal, image)
INSERT INTO pixels (image_id, x, y, r, g, b) SELECT 'gradient', x, y, r, g, b FROM _pixels;
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