diff --git a/backend/api/endpoints/command.py b/backend/api/endpoints/command.py
index 6da4497..f0cbb01 100644
--- a/backend/api/endpoints/command.py
+++ b/backend/api/endpoints/command.py
@@ -40,15 +40,17 @@ def create_command(payload: CommandRequest, db: Session = Depends(get_db)):
     @return returns a json object with field of "data" under which there is the payload now pulled from the database
     """
     # TODO:(Member) Implement this endpoint
-    new_command = Command(command_type=payload.command_type, params=payload.params)
-   
-    db.add(new_command)
-    db.commit()
-    db.refresh(new_command)
-
-
-    return {"data": new_command}
-                     
+    try:
+        new_command = Command(command_type=payload.command_type, params=payload.params)
+    
+        db.add(new_command)
+        db.commit()
+        db.refresh(new_command)
+
+        return {"data": new_command}
+    except Exception as e:
+        db.rollback()
+        raise HTTPException(status_code=500, detail="Fail to create command {str(e)}")
 
 
 
diff --git a/backend/api/middlewares/logger_middleware.py b/backend/api/middlewares/logger_middleware.py
index 6813824..dcf4070 100644
--- a/backend/api/middlewares/logger_middleware.py
+++ b/backend/api/middlewares/logger_middleware.py
@@ -1,4 +1,4 @@
-import time
+from time import time, strftime
 from collections.abc import Callable
 from typing import Any
 from fastapi import Request, Response
@@ -20,14 +20,18 @@ async def dispatch(
         @return Response from endpoint
         """
         # TODO:(Member) Finish implementing this method
-        start_time = time.time()
-        request_time = time.strftime('%Y-%m-%d %H:%M:%S')
+        start_time = time()
+        request_time = strftime('%Y-%m-%d %H:%M:%S')
         logger.info(f"Request started: [{request_time}] | {request.method} | {request.url.path} | Params: {request.query_params}")
         
         response = await call_next(request)
 
+        raw_byte = b""
+        async for chunk in response.body_iterator:
+            raw_byte += chunk
+
         # Log response details and duration
-        duration = time.time() - start_time
+        duration = time() - start_time
 
-        logger.info(f"Response sent: {response.status_code} | Duration: {duration:.4f}s")
-        return response
+        logger.info(f"Response sent: {raw_byte} {response.status_code} | Duration: {duration:.4f}s")
+        return Response(content=raw_byte, status_code=response.status_code, headers=dict(response.headers), media_type=response.media_type)
diff --git a/backend/data/data_models.py b/backend/data/data_models.py
index bceaf55..583ccad 100644
--- a/backend/data/data_models.py
+++ b/backend/data/data_models.py
@@ -39,15 +39,15 @@ def validate_params_format(self):
         The format of the comma seperated values is "data1,data2" so no spaces between data and the commas.
         """
         # TODO: (Member) Implement this method
-        if self.params == None and self.format == None:
+        if self.params is None and self.format is None:
             return self
-        elif self.params == None or self.format == None:
-            raise ValueError()
+        elif self.params is None or self.format is None:
+            raise ValueError("One of params or format is not initialized.")
        
         if len(self.params.split(",")) == len(self.format.split(",")):
             return self
         else:
-            raise ValueError()
+            raise ValueError("Number of comma separated value of params and format does not match.")