fix(models): remove timestamps from models where tables lack createdAt/updatedAt columns

Add withDateSessionMixin for proper timestamp handling and fix models
to return empty timestamps array when database tables don't have
created_at/updated_at columns. This prevents ORM insert/update errors.

Models updated:
- Branch, Role, RolePermission, ViewColumn, ViewRole
- InventoryAdjustment, InventoryAdjustmentEntry, InventoryTransactionMeta
- BillLandedCostEntry, CreditNote, CreditNoteAppliedInvoice, RefundCreditNote
- PaymentReceived, SaleInvoice, SaleReceipt, Item, ItemEntry
- RefundVendorCredit, VendorCreditAppliedBill
- ItemWarehouseQuantity, Warehouse, WarehouseTransfer, WarehouseTransferEntry
- Setting, TenantMetadataModel, TenantUser

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/server/src/models/withDateSessionMixin.ts

@@ -0,0 +1,40 @@
+import * as moment from 'moment';
+import { Model } from 'objection';
+
+type Constructor<T = {}> = new (...args: any[]) => T;
+
+export const withDateSessionMixin = <T extends Constructor<Model>>(BaseModel: T) => {
+  return class DateSession extends BaseModel {
+    constructor(...args: any[]) {
+      super(...args);
+    }
+
+    get timestamps() {
+      return [];
+    }
+    
+    $beforeUpdate(opt, context) {
+      const maybePromise = super.$beforeUpdate(opt, context);
+
+      return Promise.resolve(maybePromise).then(() => {
+        const key = this.timestamps[1];
+
+        if (key && !this[key]) {
+          this[key] = moment().format('YYYY/MM/DD HH:mm:ss');
+        }
+      });
+    }
+
+    $beforeInsert(context) {
+      const maybePromise = super.$beforeInsert(context);
+
+      return Promise.resolve(maybePromise).then(() => {
+        const key = this.timestamps[0];
+
+        if (key && !this[key]) {
+          this[key] = moment().format('YYYY/MM/DD HH:mm:ss');
+        }
+      });
+    }
+  }
+}