FastAPI module (python) for Toncoin translations

It is necessary to add functionality for a project on fastapi (python) for generating and sending transactions in TON using pytoniq.
Project: Users submit requests for withdrawal in TON with a record in the database. These requests are executed after 21 days.
Workflow:
After new funds appear (or on schedule), a worker checks the balance of the TON wallet (of the project). If the balance is sufficient for one or several pending requests, it selects a request from the queue (most likely a separate worker). Process requests sequentially (using a queue) – check the balance, send transactions via pytoniq, update statuses in the database.

For processing each request:

• Checks that the wallet balance exceeds the transfer amount plus the fee.
• Forms a transaction to transfer TON to the specified address.
• Upon successful sending, updates the request status in the database (for example, to completed), and in case of an error – changes the status to failed, and after new funds appear (or on schedule) tries again.

If the balance is below the required amount for the next payment, repeat the check after a specified interval.

It is important that the queue waiting for withdrawal is reliably implemented and operates without unexpected surprises. Based on the results of the task execution, new tasks periodically arise for this or other projects.