Release v1.13.0, February 2022, Release Candidate 3

Changes since rc2:

• Added new database optimizations that particularly speed up the loading of long lists of learning objects. For example, the Edit course page (contents tab).

In more technical terms,

• Database models that use inheritance in the Python code were expensive to query because they use additional queries to resolve the subclass of the object.
• These models now use prefetching to reduce the number of database queries.
• This improves the page load times on pages that list objects from inheritance models as their subclass instances.
• The Edit course section lists the learning objects as their subclasses and the page does not use the course content cache, thus it always queries the database.

Release notes:
https://apluslms.github.io/releases/v1_13.html