refactor: rename endpoint to events_per_day

frontend/src/pages/Stats.tsx

@@ -23,7 +23,7 @@ const StatPage = () => {
   useEffect(() => {
     // Posts per Day
     axios
-      .get("http://localhost:5000/stats/posts_per_day")
+      .get("http://localhost:5000/stats/events_per_day")
       .then(res => {
         setData(res.data.filter((item: any) => new Date(item.date) >= new Date("2025-06-01")));
         setLoading(false);

server/app.py

@@ -34,7 +34,7 @@ def upload_data():
     
     return jsonify({"message": "File uploaded successfully", "event_count": len(stat_obj.df)}), 200
 
-@app.route('/stats/posts_per_day', methods=['GET'])
+@app.route('/stats/events_per_day', methods=['GET'])
 def posts_per_day():
     if stat_obj is None:
         return jsonify({"error": "No data uploaded"}), 400

server/stat_gen.py

@@ -66,7 +66,7 @@ class StatGen:
 
         return (
             self.df
-            .groupby(["weekday", "hour"])
+            .groupby(["weekday", "hour"], observed=True)
             .size()
             .unstack(fill_value=0)
             .reindex(columns=range(24), fill_value=0)