Complete 0.7.1 fixes

migrations/0019_usage_preparation.sql

@@ -0,0 +1,17 @@
+ALTER TABLE piece_usages ADD COLUMN preparation_status_snapshot TEXT NOT NULL DEFAULT 'ready'
+	CHECK (preparation_status_snapshot IN ('preparing', 'ready'));
+
+ALTER TABLE piece_usages ADD COLUMN preparation_effort_snapshot TEXT
+	CHECK (preparation_effort_snapshot IS NULL OR preparation_effort_snapshot IN ('low', 'medium', 'high'));
+
+UPDATE piece_usages
+SET preparation_status_snapshot = CASE
+		WHEN EXISTS (
+			SELECT 1 FROM pieces p
+			WHERE p.id = piece_usages.original_piece_id AND p.status = 'preparing'
+		) THEN 'preparing'
+		ELSE 'ready'
+	END,
+	preparation_effort_snapshot = (
+		SELECT p.preparation_effort FROM pieces p WHERE p.id = piece_usages.original_piece_id
+	);