Update utils.py

utils.py

@@ -103,7 +103,16 @@ def serialize_patient(patient: dict) -> dict:
     return patient_copy
 
 def compute_patient_data_hash(data: dict) -> str:
-    serialized = json.dumps(data, sort_keys=True)
+    # Custom JSON encoder to handle datetime objects
+    class DateTimeEncoder(json.JSONEncoder):
+        def default(self, obj):
+            if isinstance(obj, datetime):
+                return obj.isoformat()
+            elif isinstance(obj, ObjectId):
+                return str(obj)
+            return super().default(obj)
+    
+    serialized = json.dumps(data, sort_keys=True, cls=DateTimeEncoder)
     return hashlib.sha256(serialized.encode()).hexdigest()
 
 def compute_file_content_hash(file_content: bytes) -> str: