| ⇢ | A | DatabaseChecker added | 
| ⇢ | B | DatabaseChecker::checkSessionData() added | |
| ⇢ | B | InstallCommand::setupSugarSessionVars() added | |
| ⇢ | A | SystemChecker::checkDatabaseDrivers() added | |
| ⇢ | A | DatabaseChecker::checkDatabaseConnection() added | |
| ⇢ | A | DatabaseChecker::runChecks() added | |
| A | ↛ | SystemChecker::checkDatabaseConnection() removed |