update chicken weight to have chicken_area data as well

backend/apps/operations/models.py

@@ -105,6 +105,7 @@ class ChickenWeight(models.Model):
     chicken_count = models.IntegerField()
     uniformity = models.FloatField()
     average_daily_gain = models.FloatField()
+    chicken_area = models.FloatField(default=0.0)
     cycle = models.ForeignKey(Cycle, on_delete=models.CASCADE, related_name="chicken_weights")
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)