Update concepts-extensions.md

Author: GennadNY

articles/postgresql/flexible-server/concepts-extensions.md

@@ -400,7 +400,7 @@ SELECT cron.schedule_in_database('VACUUM','0 10 * * * ','VACUUM','testcron',null
 ```
 
 > [!NOTE]
-> pg_cron extension is preloaded in shared_preload_libraries for every Azure Database for PostgreSQL -Flexible Server inside postgres database to provide you with ability to schedule jobs to run in other databases within your PostgreSQL DB instance without compromising security. However, for security reasons, you still have to [allow list](#how-to-use-postgresql-extensions) pg_cron extension and install it using [CREATE EXTENSION](https://www.postgresql.org/docs/current/sql-createextension.html) command.
+> pg_cron extension is preloaded in shared_preload_libraries for every Azure Database for PostgreSQL -Flexible Server inside postgres database to provide you with ability to schedule jobs to run in other databases within your PostgreSQL DB instance without compromising security. However, for security reasons, you still have to [allow list](#how-to-use-postgresql-extensions) pg_cron extension and install it using [CREATE EXTENSION](https://www.postgresql.org/docs/current/sql-createextension.html) command. 
 
 Starting with pg_cron version 1.4, you can use the cron.schedule_in_database and cron.alter_job functions to schedule your job in a specific database and update an existing schedule respectively.
 
@@ -410,6 +410,9 @@ To delete old data on Saturday at 3:30am (GMT) on database DBName
 ```
 SELECT cron.schedule_in_database('JobName', '30 3 * * 6', $$DELETE FROM events WHERE event_time < now() - interval '1 week'$$,'DBName');
 ```
+>[!NOTE]
+> cron_schedule_in_database function allows for user name as optional parameter. Setting the username to a non-null value requires PostgreSQL superuser privilege and is not supported in Azure Database for PostgreSQL - Flexible Server. Above examples show running this function with optional user name parameter ommitted or set to null, which runs the job in context of user scheduling the job, which should have azure_pg_admin role priviledges. 
+
 
 To update or change the database name for the existing schedule 
 ```