chore: log event changes for cas backend validation (#2587)

Signed-off-by: Miguel Martinez <miguel@chainloop.dev>

Author: migmartri

app/controlplane/cmd/main.go

@@ -178,7 +178,7 @@ func main() {
 		// Start around 24h mark to avoid overlap with default checker
 		go app.casBackendChecker.Start(ctx, &biz.CASBackendCheckerOpts{
 			CheckInterval: 24 * time.Hour,
-			InitialDelay:  24 * time.Hour,
+			InitialDelay:  (24 * time.Hour) + jitter,
 			OnlyDefaults:  toPtr(false),
 		})
 	}

app/controlplane/pkg/biz/casbackend.go

@@ -616,19 +616,29 @@ func (uc *CASBackendUseCase) PerformValidation(ctx context.Context, id string) e
 	}
 
 	defer func() {
+		// reload the backend in case some other instance updated it while we were validating
+		backend, err := uc.repo.FindByID(ctx, backendUUID)
+		if err != nil {
+			uc.logger.Errorw("msg", "finding backend after validation", "ID", id, "error", err)
+			return
+		} else if backend == nil {
+			uc.logger.Errorw("msg", "backend not found after validation", "ID", id)
+			return
+		}
+
+		// Store previous status for audit logging
+		previousStatus := backend.ValidationStatus
+
 		// Update the validation status and error
 		uc.logger.Infow("msg", "updating validation status", "ID", id, "status", validationStatus, "error", validationError)
 		if err := uc.repo.UpdateValidationStatus(ctx, backendUUID, validationStatus, validationError); err != nil {
 			uc.logger.Errorw("msg", "updating validation status", "ID", id, "error", err)
 			return
 		}
 
-		// Store previous status for audit logging
-		previousStatus := backend.ValidationStatus
-
 		// Log status change as an audit event if status has changed and auditor is available
 		if uc.auditorUC != nil && previousStatus != validationStatus {
-			uc.logger.Debugw("msg", "status changed, dispatching audit event",
+			uc.logger.Infow("msg", "status changed, dispatching audit event",
 				"backend", backend.ID,
 				"previousStatus", previousStatus,
 				"newStatus", validationStatus)