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And if you store events with both an event_timestamp and effective_timestamp, you get bi-temporal state for free too.

Invaluable when handing a time series of financial events subject to adjustments and corrections. For instance, backdate interest adjustments due to misbooked payments, recalculate a derivatives trade if reported market data was initially incorrect, calculate adjustments to your business end of month P&L after correcting errors from two months ago.



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