bugfix: change url and driver

src/main/resources/application.properties

 
 # Database connection settings
-spring.datasource.url=jdbc:postgres://smartmat_user:Eyhs1OJxyZC56NQCrV7yAolEk9AkLAsC@dpg-cgv5710dh87i4q0fd1b0-a.frankfurt-postgres.render.com/smartmat
+spring.datasource.url=jdbc:postgresql://frankfurt-postgres.render.com:5432/smartmat
 spring.datasource.username=smartmat_user
 spring.datasource.password=Eyhs1OJxyZC56NQCrV7yAolEk9AkLAsC
-spring.datasource.driver-class-name=org.postgresql.Driver
 
 # jpa settings
 spring.jpa.show-sql=true