How to keep track of ongoing tasks and prevent duplicate tasks?

I have a python script that receives incoming messages from web and process the data:

How to keep track of ongoing tasks and prevent duplicate tasks?

I have a python script that receives incoming messages from web and process the data:

How to keep track of ongoing tasks and prevent duplicate tasks?

I have a python script that receives incoming messages from web and process the data:

How to keep track of ongoing tasks and prevent duplicate tasks?

I have a python script that receives incoming messages from web and process the data:

Pythonerror when working with asyncio, aiosqlite and telethon

My code:

Pythonerror when working with asyncio, aiosqlite and telethon

My code:

Pythonerror when working with asyncio, aiosqlite and telethon

My code:

Pythonerror when working with asyncio, aiosqlite and telethon

My code:

Pythonerror when working with asyncio, aiosqlite and telethon

My code:

Pythonerror when working with asyncio, aiosqlite and telethon

My code: