yearMonth split into year + month

app/lib/db-types.ts

@@ -1,4 +1,5 @@
 import { ObjectId } from "mongodb";
+import { inter } from "../ui/fonts";
 
 export interface BillAttachment {
     fileName: string;
@@ -17,8 +18,10 @@ export interface BillingLocation {
     userEmail?: string | null;
     /** name of the location */
     name: string;
-    /** the value is encoded as yyyymm (i.e. 202301) */
-    yearMonth: number;
+    /** billing period year */
+    year: number;
+    /** billing period month */
+    month: number;
     /** array of bills */
     bills: Bill[];
     /** (optional) notes */