Implement status update tracking and improve attendance summary logic

[hrideshmg]

This release contains the following two major changes to root:

1. The attendance summary logic which was handled at the database level earlier has been simplified to work via the use of a single SQL query. This alleviates the need to maintain and update a separate summary table since statistics can now be generated on the fly.
2. Status update logging has been introduced

[hrideshmg]

@ivinjabraham pls review, thanks