AckTrace execution-state illustrations

JavaScript is required for the interactive demos. The examples use synthetic data only.

Position timeline: fill_open, fees, funding, fill_reduce, fill_close, and balance_delta reconstruct position state over time.
Order lifecycle replay: expected SENT to ACCEPTED to FILLED diverges from recorded SENT to ACCEPTED.
Balance integrity: opening balance, fill delta, fee, and funding reconstruct expected closing balance and expose variance when an event is missing.