add min + expiry

schema/item.json

@@ -26,6 +26,16 @@
                         "type": "string",
                         "title": "Variant Name",
                         "description": "The name of the Variant"
+                    },
+                    "min": {
+                        "type": "number",
+                        "title": "Minimum inventory",
+                        "description": "The minimum amount of inventory for an Item. Thre actual inventory amount should always be higher than that."
+                    },
+                    "expiry": {
+                        "type": "number",
+                        "title": "Expiry days",
+                        "description": "Number of days until this item variant is considered expired."
                     }
                 }
             }