Refactor session middleware and add constant for database name

[moiz697]

Refactor session middleware and add constant for database name

• Refactored the UserSessions middleware function for improved readability and code style.
• Introduced a constant variable DatabaseName to store the name of the database.
• Updated the code to use the constant for session handling instead of a hard-coded string.
• Made the necessary imports and error handling adjustments.

This commit improves the session middleware implementation and enhances code maintainability.

[dehowef]

Looks good to me.