added function to insert lists of data

code/database.py

@@ -157,3 +157,16 @@ def insert(username, timestamp, content):
     }
     with Data_table() as dt:
         dt.insert(val_dict)
+
+def insert_list(username_list, timestamp_list, content_list):
+    with Data_table() as dt:
+        for username, timestamp, content in zip(username_list, timestamp_list, content_list):
+            try:
+                val_dict = {
+                    'username': username,
+                    'time': timestamp,
+                    'content': content
+                }
+                dt.insert(val_dict)
+            except Exception as e:
+                logging.warning(e)