5410 - Add paint price to prices_other_products (#395)

migrations/000.476.sql

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+ALTER TABLE prices_other_products DROP COLUMN IF EXISTS paint_price_per_liter;
+
+-- Add new column to prices_other_products for paint price per litre (with made up prices)
+ALTER TABLE prices_other_products ADD COLUMN paint_price_per_liter NUMERIC;
+UPDATE prices_other_products SET paint_price_per_liter = wallpaper_kit_price; -- Set paint price per litre to the same as wallpaper kit price for now
+ALTER TABLE prices_other_products ALTER COLUMN paint_price_per_liter SET NOT NULL;
+ALTER TABLE prices_other_products ADD CONSTRAINT valid_paint_price_per_liter CHECK (prices_other_products.paint_price_per_liter > 0);