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PRAGMA foreign_keys = ON;
PRAGMA temp_store = MEMORY;
CREATE TABLE images (
id TEXT PRIMARY KEY,
width INTEGER NOT NULL,
height INTEGER NOT NULL
);
CREATE TABLE pixels (
id INTEGER PRIMARY KEY AUTOINCREMENT,
image_id TEXT NOT NULL,
x INTEGER NOT NULL,
y INTEGER NOT NULL,
r INTEGER NOT NULL CHECK(r >= 0 AND r <= 255),
g INTEGER NOT NULL CHECK(g >= 0 AND g <= 255),
b INTEGER NOT NULL CHECK(b >= 0 AND b <= 255),
FOREIGN KEY(image_id) REFERENCES images(id),
UNIQUE(image_id, x, y)
);
CREATE TRIGGER delete_pixels_when_image_deleted
AFTER DELETE ON images
WHEN (SELECT COUNT(*) FROM images WHERE id = OLD.id) = 0
BEGIN
DELETE FROM pixels WHERE image_id = OLD.id;
END;
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