7ad5b52 Send username of recipient to Fedora Message Bus

Authored and Committed by shraddhaag 5 months ago
    Send username of recipient to Fedora Message Bus
    
    This commit adds:
    
    1. A new optional field in the message model `recipient_username`
    to save the username of the recipient if available.
    2. A new migration to reflect the above changes in the database.
    3. Sends the recipient's username if the email is associated with
    a FAS account or else logs otherwise.