minor

db/70_prices.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS prices (
+  product_id UUID PRIMARY KEY REFERENCES products(id) ON DELETE CASCADE,
+  currency CHAR(3) NOT NULL DEFAULT 'RUB',
+  price NUMERIC(12, 2) NOT NULL CHECK (price >= 0),
+  old_price NUMERIC(12, 2) NULL CHECK (old_price IS NULL OR old_price >= 0)
+);