Updates the copyright to 2021 for all files that have a copyright. Files in our source code without the copyright header still do not receive one automatically. Additionally, backlisted files are also excluded.
Previously the copyright of chiliproject which references redmine stated a copyright of redmine up to and including 2017 which is not true for the code we have in here. Because of that I changed that to 2013
This sets the session (== ActiveRecord connection) wide default transaction isolation level.
Specific reason: For advisory based locking over journals in MySQL to work correctly,
we need to ensure that the SELECT that determines the maximum version reads from the most recent committed data.
However, by default MySQL would use REPEATABLE READ, which snapshots the database at the first SELECT of a transaction.
Generic reason: Until now we did not expect any specific isolation level,
this might be bad as MySQL and PostgreSQL already use different defaults. It is also possible to reconfigure a DBMS for a different default, so we would either need to require our customers to configure a specified isolation level OR we set one for our own sessions... Now we know for sure that our transactions are using READ COMMITTED unless specified otherwise on the transaction.
Alexander Brandon Coles