feat: add printer types

migrations/000099_add_printer_types_to_products.down.sql

@@ -0,0 +1,8 @@
+-- Only the first printer fits back into printer_type; the extra stations are lost.
+ALTER TABLE products ADD COLUMN printer_type VARCHAR(50) DEFAULT 'kitchen';
+
+UPDATE products SET printer_type = COALESCE(printer_types->>0, '');
+
+CREATE INDEX idx_products_printer_type ON products(printer_type);
+
+ALTER TABLE products DROP COLUMN printer_types;

migrations/000099_add_printer_types_to_products.up.sql

@@ -0,0 +1,12 @@
+-- A product can be prepared at more than one station: a meal-and-drink package goes to
+-- the kitchen and to the bar. printer_types replaces the single printer_type.
+ALTER TABLE products ADD COLUMN printer_types JSONB NOT NULL DEFAULT '["kitchen"]';
+
+UPDATE products
+SET printer_types = CASE
+    WHEN COALESCE(printer_type, '') = '' THEN '[]'::jsonb
+    ELSE jsonb_build_array(printer_type)
+END;
+
+-- Dropping the column drops idx_products_printer_type with it.
+ALTER TABLE products DROP COLUMN printer_type;