Add session rollback handling in Connection.java, improve resource management, and refine debug logging in LoginController.

backend/src/main/java/com/alttd/altitudeweb/controllers/login/LoginController.java

@@ -95,8 +95,9 @@ public class LoginController implements LoginApi {
     public ResponseEntity<UsernameDto> getUsername() {
         log.debug("Loading username for logged in user");
         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
-
+        log.debug("Loaded authentication for logged in user {}", authentication);
         if (authentication == null || !(authentication.getPrincipal() instanceof OAuth2ResourceServerProperties.Jwt)) {
+            log.debug("Loaded authentication for logged in user is null or not a jwt");
             return ResponseEntity.status(401).build();
         }
         Jwt jwt = (Jwt) authentication.getPrincipal();