Building the Commercial Graph

A recorded working session on the model underneath the product: why revenue is stored as events rather than balances, and what that buys you when someone questions a number nine months later.

What is covered

• Event sourcing for contracts, usage, invoices and payments
• Deriving metrics rather than storing them
• Replay: reconstructing any figure at any past date
• Lineage: tracing a dashboard number back to the clause that caused it

If you can only see the balance, you can only argue about the balance.

The session closes with the practical trade-offs, storage cost, replay time, and where a derived-metrics model genuinely is harder to operate than a conventional ledger.