- Filter searchable courses if set.
- Sites with large groups should now experience better performance.
- Applies and optimises query against a proper date range.
Co-authored-by: Mark Sharp <mark.sharp@solent.ac.uk>
Co-authored-by: Peter Sistrom <petersistrom@catalyst-au.net>
Co-authored-by: Kevin Pham <keevan.pham@gmail.com>