fix: Task Overdue status propagates to project

- Used ORM instead of a SQL for set_task_as_overdue
- update_status function compares the time and marks the appropriate task as overdue
- The on_update hook makes the changes in project as well

erpnext/projects/doctype/task/task.py

@@ -159,6 +159,13 @@ class Task(NestedSet):
 
 		self.update_nsm_model()
 
+	def update_status(self):
+		if self.status not in ('Cancelled', 'Closed'):
+			from datetime import datetime
+			if self.exp_end_date < datetime.now().date():
+				self.date = 'Overdue'
+				self.save()
+
 @frappe.whitelist()
 def check_if_child_exists(name):
 	child_tasks = frappe.get_all("Task", filters={"parent_task": name})
@@ -186,10 +193,9 @@ def set_multiple_status(names, status):
 		task.save()
 
 def set_tasks_as_overdue():
-	frappe.db.sql("""update tabTask set `status`='Overdue'
-		where exp_end_date is not null
-		and exp_end_date < CURDATE()
-		and `status` not in ('Closed', 'Cancelled')""")
+	tasks = frappe.get_all("Task")
+	for task in tasks:
+		frappe.get_doc("Task", task.name).update_status()
 
 @frappe.whitelist()
 def get_children(doctype, parent, task=None, project=None, is_root=False):