Move Workflow Manager databases from SQL Server 2016 to SQL Server 2019

Thank you for your reply,
However I don't want to reinstall WF Manager and Service bus because I keep existing servers where they are installed. Only SQL databases will have to be moved to a new SQL 2019.
Do I still have to reinstall WFM et SB ?? I just have to change SQL ALIAS to point to the new SQL Server so it finds the associated database right ?
Thanks.

If you are keeping the same WF servers. no need to reinstall. Just point the SQL alias to the new SQL server, make sure permissions are same as on previous instance and it should be good.

@AAL ,

Is there any update on this thread?

Thanks for your reply,
On the following article about Workflow Manager CU5, SQL Server 2019 is not mentioned (only SQL 2017 is indicated). Is Workflow Manager supported by Microsoft on SQL Server 2019?
https://support.microsoft.com/fr-fr/topic/description-de-la-mise-%C3%A0-jour-cumulative-5-pour-le-gestionnaire-de-workflow-1-0-7631b4c0-b3d7-644c-fcd9-671f10cfc0bb
Thank you

@AAL ,

I think Workflow Mnager is supported by SQL Server 2019. But you must change the compatibility model of the databases to version 120(the default Compatibility Level iDesignation of SQL Server 2019 is 150). You can change compatibility level with below commands.

SELECT name, compatibility_level FROM sys.databases;  
GO  
USE [Master];  
GO  
ALTER DATABASE [WFInstanceManagementDB] SET COMPATIBILITY_LEVEL = 120;  
GO  
ALTER DATABASE [WFManagementDB] SET COMPATIBILITY_LEVEL = 120;  
GO  
ALTER DATABASE [WFResourceManagementDB] SET COMPATIBILITY_LEVEL = 120;  
GO  
ALTER DATABASE [SbGatewayDatabase] SET COMPATIBILITY_LEVEL = 120;  
GO  
ALTER DATABASE [SbManagementDB] SET COMPATIBILITY_LEVEL = 120;  
GO  
ALTER DATABASE [SBMessageContainer01] SET COMPATIBILITY_LEVEL = 120;  
GO  
SELECT name, compatibility_level FROM sys.databases;  
GO