updated how --outfilename works

Author: datsom1

db_diff/cli.py

@@ -170,9 +170,14 @@ def cli(
 
     # Set default output filename if needed
     if output == "jsonfile":
+        timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
         if not output_file:
-            timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
             output_file = f"{timestamp}_diffs.json"
+        else:
+            # Append the user-specified filename to the timestamp
+            base_name = os.path.splitext(output_file)[0]  # Remove extension if present
+            output_file = f"{timestamp}_diffs_{base_name}.json"
+        
         if output_path:
             if not os.path.isdir(output_path):
                 raise click.ClickException(f"Output path '{output_path}' does not exist or is not a directory.")