diff --git a/API/hdx.py b/API/hdx.py
index a4a3bd6f..f9a6c12c 100644
--- a/API/hdx.py
+++ b/API/hdx.py
@@ -21,8 +21,18 @@
 async def create_hdx(
     request: Request, hdx_data: dict, user_data: AuthUser = Depends(staff_required)
 ):
-    hdx_instance = HDX()
+    """
+    Create a new HDX entry.
+
+    Args:
+        request (Request): The request object.
+        hdx_data (dict): Data for creating the HDX entry.
+        user_data (AuthUser): User authentication data.
 
+    Returns:
+        dict: Result of the HDX creation process.
+    """
+    hdx_instance = HDX()
     return hdx_instance.create_hdx(hdx_data)
 
 
@@ -34,23 +44,27 @@ async def read_hdx_list(
     skip: int = 0,
     limit: int = 10,
 ):
+    """
+    Retrieve a list of HDX entries based on provided filters.
+
+    Args:
+        request (Request): The request object.
+        skip (int): Number of entries to skip.
+        limit (int): Maximum number of entries to retrieve.
+
+    Returns:
+        List[dict]: List of HDX entries.
+    """
     hdx_instance = HDX()
     filters = {}
     for key, values in request.query_params.items():
         if key not in ["skip", "limit"]:
             if key in ["iso_3", "queue", "meta", "hdx_upload", "cid"]:
-                # if isinstance(values, list):
-                #     filters[f"{key} IN %s"] = tuple(values)
-                #     continue
                 filters[f"{key} = %s"] = values
                 continue
-                # if isinstance(values, list):
-                #     filters[f"dataset->>'{key}' IN %s"] = tuple(values)
-                # else:
             filters[f"dataset->>'{key}' = %s"] = values
 
     hdx_list = hdx_instance.get_hdx_list_with_filters(skip, limit, filters)
-
     return hdx_list
 
 
@@ -58,8 +72,20 @@ async def read_hdx_list(
 @limiter.limit(f"{RATE_LIMIT_PER_MIN}/minute")
 @version(1)
 async def read_hdx(request: Request, hdx_id: int):
-    hdx_instance = HDX()
+    """
+    Retrieve a specific HDX entry by its ID.
+
+    Args:
+        request (Request): The request object.
+        hdx_id (int): ID of the HDX entry to retrieve.
+
+    Returns:
+        dict: Details of the requested HDX entry.
 
+    Raises:
+        HTTPException: If the HDX entry is not found.
+    """
+    hdx_instance = HDX()
     hdx = hdx_instance.get_hdx_by_id(hdx_id)
     if hdx:
         return hdx
@@ -75,8 +101,22 @@ async def update_hdx(
     hdx_data: dict,
     user_data: AuthUser = Depends(staff_required),
 ):
-    hdx_instance = HDX()
+    """
+    Update an existing HDX entry.
+
+    Args:
+        request (Request): The request object.
+        hdx_id (int): ID of the HDX entry to update.
+        hdx_data (dict): Data for updating the HDX entry.
+        user_data (AuthUser): User authentication data.
 
+    Returns:
+        dict: Result of the HDX update process.
+
+    Raises:
+        HTTPException: If the HDX entry is not found.
+    """
+    hdx_instance = HDX()
     existing_hdx = hdx_instance.get_hdx_by_id(hdx_id)
     if not existing_hdx:
         raise HTTPException(status_code=404, detail="HDX not found")
@@ -90,8 +130,21 @@ async def update_hdx(
 async def delete_hdx(
     request: Request, hdx_id: int, user_data: AuthUser = Depends(admin_required)
 ):
-    hdx_instance = HDX()
+    """
+    Delete an existing HDX entry.
+
+    Args:
+        request (Request): The request object.
+        hdx_id (int): ID of the HDX entry to delete.
+        user_data (AuthUser): User authentication data.
 
+    Returns:
+        dict: Result of the HDX deletion process.
+
+    Raises:
+        HTTPException: If the HDX entry is not found.
+    """
+    hdx_instance = HDX()
     existing_hdx = hdx_instance.get_hdx_by_id(hdx_id)
     if not existing_hdx:
         raise HTTPException(status_code=404, detail="HDX not found")
diff --git a/src/app.py b/src/app.py
index a9a76857..02639c59 100644
--- a/src/app.py
+++ b/src/app.py
@@ -1904,6 +1904,15 @@ def __init__(self) -> None:
         self.con, self.cur = self.d_b.connect()
 
     def create_hdx(self, hdx_data):
+        """
+        Create a new HDX entry in the database.
+
+        Args:
+            hdx_data (dict): Data for creating the HDX entry.
+
+        Returns:
+            dict: Result of the HDX creation process.
+        """
         insert_query = sql.SQL(
             """
             INSERT INTO public.hdx (iso_3, hdx_upload, dataset, queue, meta, categories, geometry)
@@ -1930,6 +1939,17 @@ def create_hdx(self, hdx_data):
     def get_hdx_list_with_filters(
         self, skip: int = 0, limit: int = 10, filters: dict = {}
     ):
+        """
+        Retrieve a list of HDX entries based on provided filters.
+
+        Args:
+            skip (int): Number of entries to skip.
+            limit (int): Maximum number of entries to retrieve.
+            filters (dict): Filtering criteria.
+
+        Returns:
+            List[dict]: List of HDX entries.
+        """
         filter_conditions = []
         filter_values = []
 
@@ -1952,6 +1972,18 @@ def get_hdx_list_with_filters(
         return [orjson.loads(item[0]) for item in result]
 
     def get_hdx_by_id(self, hdx_id: int):
+        """
+        Retrieve a specific HDX entry by its ID.
+
+        Args:
+            hdx_id (int): ID of the HDX entry to retrieve.
+
+        Returns:
+            dict: Details of the requested HDX entry.
+
+        Raises:
+            HTTPException: If the HDX entry is not found.
+        """
         select_query = sql.SQL(
             """
             SELECT ST_AsGeoJSON(c.*) FROM public.hdx
@@ -1966,6 +1998,19 @@ def get_hdx_by_id(self, hdx_id: int):
         raise HTTPException(status_code=404, detail="Item not found")
 
     def update_hdx(self, hdx_id: int, hdx_data):
+        """
+        Update an existing HDX entry in the database.
+
+        Args:
+            hdx_id (int): ID of the HDX entry to update.
+            hdx_data (dict): Data for updating the HDX entry.
+
+        Returns:
+            dict: Result of the HDX update process.
+
+        Raises:
+            HTTPException: If the HDX entry is not found.
+        """
         update_query = sql.SQL(
             """
             UPDATE public.hdx
@@ -1994,6 +2039,18 @@ def update_hdx(self, hdx_id: int, hdx_data):
         raise HTTPException(status_code=404, detail="Item not found")
 
     def delete_hdx(self, hdx_id: int):
+        """
+        Delete an existing HDX entry from the database.
+
+        Args:
+            hdx_id (int): ID of the HDX entry to delete.
+
+        Returns:
+            dict: Result of the HDX deletion process.
+
+        Raises:
+            HTTPException: If the HDX entry is not found.
+        """
         delete_query = sql.SQL(
             """
             DELETE FROM public.hdx