date fix

app.py

@@ -125,6 +125,9 @@ def create_visualizations():
     vanity_tx = get_vanity_transactions(today_date)
     tx_per_chain = pd.concat([tx_per_chain, vanity_tx], ignore_index=True)
 
+    # Convert the 'date' column to datetime again after concatenation
+    tx_per_chain['date'] = pd.to_datetime(tx_per_chain['date'])
+
     fig_tx_chain = px.bar(
         tx_per_chain,
         x="date",