Update app.py

app.py

@@ -323,9 +323,17 @@ with gr.Blocks() as interface:
                         old_sample_list = [s.strip() for s in old_samples.split(",") if s.strip()]
                         all_samples = list(dict.fromkeys(old_sample_list + samples))  # deduplicate while preserving order
                         new_sample_string = ", ".join(all_samples)
-        
+
+                        # Update recent_time to store history
+                        old_timestamp = row[recent_time_col].strip() if len(row) > recent_time_col else ""
+                        if old_timestamp:
+                            new_timestamp = f"{old_timestamp}, {timestamp}"
+                        else:
+                            new_timestamp = timestamp
+                            
                         worksheet.update_cell(i, samples_col + 1, new_sample_string)
-                        worksheet.update_cell(i, recent_time_col + 1, timestamp)
+                        worksheet.update_cell(i, recent_time_col + 1, new_timestamp)
+    
                         print(f"✅ Updated existing user row for: {email}")
                         return