Free user placeholder processing moved to server-side

app.py

@@ -11,13 +11,13 @@ USER_BLACKLIST = ["gdm", "necl", "ncel", "root"]
 
 
 def get_plot_df(df):
-    df = df.fillna({"fan_speed": "N/A", "users": ""})
+    df = df.fillna({"fan_speed": "N/A"})
 
     df["users"] = df["users"].str.split(",")
 
-    # Clean users list with "Free" as the empty placeholder value
+    # Filter out blacklisted users
     df["users"] = df["users"].apply(
-        lambda user_list: [u for u in user_list if u and u not in USER_BLACKLIST] or ["Free"]
+        lambda user_list: [u for u in user_list if u not in USER_BLACKLIST]
     )
 
     # Construct a new DataFrame for the bar chart