Show more info in product card (closes #173)

migrations/0064.sql

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+CREATE VIEW stock_average_product_shelf_life
+AS
+SELECT
+	p.id,
+	CASE WHEN x.product_id IS NULL THEN -1 ELSE AVG(x.shelf_life_days) END AS average_shelf_life_days
+FROM products p
+LEFT JOIN (
+		SELECT
+			sl_p.product_id,
+			JULIANDAY(MIN(sl_p.best_before_date)) - JULIANDAY(MIN(sl_c.used_date)) AS shelf_life_days
+		FROM stock_log sl_p
+		JOIN (
+				SELECT
+					product_id,
+					stock_id,
+					MAX(used_date) AS used_date
+				FROM stock_log
+				WHERE transaction_type = 'consume'
+				GROUP BY product_id, stock_id
+			) sl_c
+			ON sl_p.stock_id = sl_c.stock_id
+		WHERE sl_p.transaction_type = 'purchase'
+		GROUP BY sl_p.product_id, sl_p.stock_id
+	) x
+	ON p.id = x.product_id
+GROUP BY p.id;