Change schema. Change functions to match new schema.

add_message_id for the new table. get_callback_id now gets id from
message_id table. Removed the null case from add_vote. Creating post no
longer adds an entry to poll table. It instead adds an entry to
message_ids table via add_message_id function

bot.py

@@ -13,20 +13,23 @@ logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - \
 
 def get_callback_id(db):
     cursor = db.cursor()
-    query = ('SELECT max(callback) FROM poll')
+    query = ('SELECT max(callback) FROM message_ids')
     cursor.execute(query)
     return int(cursor.fetchone()[0]) + 1
 
 
+def add_message_id(db, message_id, callback):
+    cursor = db.cursor()
+    query = ("INSERT INTO message_ids(callback, message_id) values(?,?)")
+    cursor.execute(query, (callback, message_id))
+    db.commit()
+
+
 def add_vote(db, callback_id, user=None):
-    if user is not None:
     user_id = user.id
     name = str(user.first_name)
     if user.last_name:
         name += " " + str(user.last_name)
-    else:
-        user_id = 0
-        name = ""
 
     cursor = db.cursor()
     query = ("INSERT INTO poll(callback, user_id, name) values(?,?,?)")
@@ -38,13 +41,13 @@ def post(bot, update, db):
     chat_id = update.message.chat_id
     if chat_id in config.allowed_users:
         callback_id = get_callback_id(db)
-        add_vote(db, callback_id)
         photo = update.message.photo[0]
         file_id = photo.file_id
         keyboard = InlineKeyboardMarkup([[InlineKeyboardButton(text="❤️",
                                         callback_data=callback_id)]])
-        bot.send_photo(chat_id=config.channel_id, photo=file_id,
+        reply = bot.send_photo(chat_id=config.channel_id, photo=file_id,
                                reply_markup=keyboard)
+        add_message_id(db, reply.message_id, callback_id)
     else:
         bot.send_message(chat_id=chat_id, text="Not Authorized")
 

schema.sql

@@ -1,2 +1,3 @@
 CREATE TABLE IF NOT EXISTS poll(callback int NOT NULL, user_id int, name varchar, UNIQUE(callback, user_id));
-INSERT INTO poll values(0, 0, NULL);
+CREATE TABLE IF NOT EXISTS message_ids(callback int PRIMARY KEY, message_id int NOT NULL UNIQUE);
+INSERT INTO message_ids values(0, 0);