Create a garbage collector for old Draft events

When any user clicks the button to create a new meeting, a new record is created in the Event tables with the `State` set to `DRAFT`. These records will stay forever in there if we don't clean them.

We should have a flow that works like a garbage collector, each day, it should delete old records that are still in DRAFT mode.

I'm thinking about deleting any draft that is 30 days or older.

No files, tests, or entry points are named. Start by locating the Event tables and the existing mechanism for daily maintenance, then define completion as automatically deleting records that remain in DRAFT state for 30 days or longer.

Written by the indexing model from the issue text.