WIP CSMH Extended Tables/Database - #11441
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This is a clone (copy) of CSMH's declaration and methods with an added id of bigint unsigned. We should be able to delete the save_history code, but needs testing.
This gives us a gap to backfill as needed. Since the new table's pk is an unsigned bigint, even for people who don't consolidate CSMH into CSMHE, the lost rows are unlikely to matter.
We need to use it from cms and lms
This is horrible and just smashes the code into the view and the client.
Handle queries directed to student_module_history vs default and the extra queries generated by Django 1.8 (SAVEPOINTS, etc). Additionally, flag testing classes as multi_db so that Django will flush the non-default database between unit tests.
The original branch split these across database but 1.8 adds a ton of SAVEPOINT queries as part of the code to rollback the database during unit tests.
When calling StudentModule().delete() Django will try to delete CSMHE objects, but naively does so in the database, not by consulting the database router. Instead, we disable django cascading deletes and listen for post_delete signals and clean up CSMHE by hand.
Without this, we would pull settings out of default and into secondary databases. Unfortunately, without adding more ENV variables, using this for anything other than DB_MIGRATION_USER or DB_MIGRATION_PASS will probably not do what you intend.
This now correctly migrates and dumps files for both databases.
These happen during the bok choy migration script that saves a cached version of the DB.
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