Time since the last event was received from each source instance. A rising lag means an app has stopped publishing events — its trades and fund movements are no longer reaching the settlement system. If lag exceeds the configured threshold an alert fires and the backlog is replayed automatically once the source recovers.

The central configuration object. Defines a reconciliation relationship between two specific sub-accounts for a business line — e.g. mainapp:spot ↔ binance:spot. References Accounts (not Instances) so the exact sub-account type is unambiguous. Every trade event, journal entry, position calculation, and risk check happens in the context of a Settlement Line.