ADR 0001: Use Event Sourcing

Status: Accepted

Context

We need reproducibility and audit trails for scientific results.

Decision

Represent domain state as an append-only stream of domain events.

Consequences:

• ✅ Enables replay, reproducibility, and debugging.
• ✅ Easy to build multiple projections (e.g., light curves, QC reports).
• ❌ Adds complexity; projections must be managed.