fix: handle empty values in heartbeat

Author: steveiliop56

internal/controller/instances_controller.go

@@ -3,6 +3,7 @@ package controller
 import (
 	"context"
 	"errors"
+	"strings"
 	"time"
 	"tinyauth-analytics/internal/model"
 
@@ -75,6 +76,14 @@ func (ic *InstancesController) heartbeat(c *gin.Context) {
 		return
 	}
 
+	if strings.TrimSpace(heartbeat.UUID) == "" || strings.TrimSpace(heartbeat.Version) == "" {
+		c.JSON(400, gin.H{
+			"status":  400,
+			"message": "Missing required fields",
+		})
+		return
+	}
+
 	ctx := context.Background()
 	instance, err := gorm.G[model.Instance](ic.database).Where("uuid = ?", heartbeat.UUID).First(ctx)