On September 2, Shin (@hey_itsmyturn) reported a new record for the USD/IRR exchange rate:

USD/IRR hits another record, 2,186,000 Rials (218,600 Tomans)
Another all time low for the Iranian currency.

The post quoted an August 23 update from the same account documenting the rial’s previous low:

USD/IRR is about to hit 2,000,000 (200,000 Tomans for a US Dollar)
It's at 199,400 tomans at the moment (which is a new low for Iranian currency)