A method including: receiving one or more first transactions at the computer replay system from one or more data sources; storing the one or more first transactions in a transactional database; updating a current state of one or more first records in a historical database based on the one or more first transactions; receiving a request from a first user for a replay of the data starting at a first moment; determining a state of the one or more first records in the historical database at the first moment; providing the state of the one or more first records at the first moment to the first user; determining one or more second transactions in the transactional database that occurred after the first moment; and providing sequentially the one or more second transactions to the first user. Other embodiments are provided.