Architecture Decision Records (ADR)

Short, durable notes on why BTU is shaped the way it is. Each ADR captures one decision; the full narrative lives in Technical Design.

ADR	Title	Status
0001	Two-component architecture (Frappe app + daemon)	Accepted
0002	External scheduler daemon is mandatory	Accepted
0003	Frappe built-in scheduler is not a user product	Accepted
0004	Run Later prioritizes Desk visibility over RQ delay	Accepted
0005	Redis RPC as scheduler control plane	Accepted

Format

Each record includes Context, Decision, and Consequences. Status values: Proposed, Accepted, Deprecated, Superseded.

When a decision is reversed, add a new ADR and mark the old one Superseded — do not silently rewrite history.