Bug
- Migrations properly serialize dynamic triggers and add better support for reverse migrations [Wes Kendall, 2eb3014]
Triggers that override ``get_func`` or otherwise generate dynamic SQL are properly reflected
in migrations when the underlying implementation changes. Along with this, migrations now serialize
SQL objects instead of trigger classes, making it more robust when reversing migrations or
updating underlying implementations of existing triggers.
This change updates the hashes of all triggers and thus re-creates all triggers when running
``makemigrations`` or when manually installing them.