Merge branch '45-switch-jpa-to-backed-by-postgres' into 'master'

Resolve "Switch JPA to backed by Postgres"

Closes #45

See merge request marcel.schwarz/2020ss-qbc-geofence-timetracking!22

backend/build.gradle

@@ -18,7 +18,7 @@ dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-web'
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'org.springframework.boot:spring-boot-starter-actuator'
-	implementation 'org.mariadb.jdbc:mariadb-java-client:1.5.7'
+	implementation 'org.mariadb.jdbc:mariadb-java-client'
 
 	runtimeOnly 'com.h2database:h2'
 	testImplementation('org.springframework.boot:spring-boot-starter-test') {

backend/src/main/resources/application.properties

@@ -1,4 +1,5 @@
 server.port=80
 spring.data.rest.basePath=/api
 spring.datasource.hikari.initialization-fail-timeout=0
+spring.datasource.hikari.max-lifetime=300000
 spring.profiles.active=prod