feat: make backup period configurable

Author: metacosm

server/src/main/java/net/laprun/sustainability/power/persistence/SQLiteFilePersister.java

@@ -45,8 +45,8 @@ void init() {
         access = entityManager.unwrap(SessionImpl.class).getJdbcConnectionAccess();
     }
 
-    // Execute a backup every 10 seconds
-    @Scheduled(delay = 10, delayUnit = TimeUnit.SECONDS, every = "10s")
+    // Periodical backup
+    @Scheduled(delay = 5, delayUnit = TimeUnit.MINUTES, every = "${power-server.db.backup.period}")
     void scheduled() {
         backup();
     }

server/src/main/resources/application.properties

@@ -3,5 +3,7 @@ quarkus.datasource.jdbc.url=jdbc:sqlite:power-server.db
 quarkus.datasource.db-kind=sqlite
 quarkus.datasource.jdbc.min-size=1
 
+power-server.db.backup.period=5m
+
 # Only use this property once to create the initial database
 # quarkus.hibernate-orm.database.generation=create