Database
UpdateDB
https://github.com/GitFabian/Tethys/blob/master/inst/core/UpdateDB.php#L1
The database updater executes all queries to get from any stage (version number) to the latest version of the database.
Therefor (up from version 1.0, as mentioned in the development principles), every change in the database is documented
in the file inst/core/UpdateDB.
core\Database
https://github.com/GitFabian/Tethys/blob/master/core/Database.php#L1
Contains static methods for database operations.