Refactor Invoice model by removing duplicate 'paidAt' field definition and ensuring consistent property structure.

src/database/models/Invoice.js

@@ -302,6 +302,14 @@ export const Invoice = {
       required: true
     },
 
+    {
+      name: 'paidAt',
+      label: 'Paid At',
+      type: 'dateTime',
+      readOnly: true,
+      columnWidth: 175
+    },
+
     {
       name: 'to',
       label: 'To',
@@ -333,13 +341,7 @@ export const Invoice = {
       readOnly: true,
       columnWidth: 175
     },
-    {
+
-      name: 'paidAt',
-      label: 'Paid At',
-      type: 'dateTime',
-      readOnly: true,
-      columnWidth: 175
-    },
     {
       name: 'totalAmountWithTax',
       label: 'Total Amount w/ Tax',