These files include the information for database user and password:
%KEYCLOAK_HOME%\standalone\configuration\standalone.xml
%USER_HOME%\.ard\conf\settings.properties and C:\Windows\ServiceProfiles\LocalService\.ard\conf\settings.properties(or C:\Windows\System32\config\systemprofile\.ard\conf\settings.properties)
Then these files should be changed.
And it is needed to re-deploy ard#api.war, ard#flow-storage.war, ard#ims.war, ard#migration.war and ard#ui.war files to TOMCAT for reflecting the changes.