After doing some research, I found that the $1.951TN reverse repo transaction is actually a record high for the Federal Reserve. The previous record was $1.75TN in June 2021. The overnight decrease of $10BN is a relatively small fluctuation in comparison to the overall amount. However, it's important to note that the Federal Reserve has been conducting large reverse repo transactions in recent months due to an excess of cash in the financial system. This could be a temporary measure to control the money supply and could change in the future.