Architecture Decisions Log (ADR)

Decision	Chosen Option	Alternative Considered	Deciding Factor
Primary Engine	Node.js 20 / TypeScript 5	Python asyncio	High-concurrency WebSocket event loop and end-to-end typed contracts.
Database	MongoDB Time-Series	InfluxDB	Single unified database engine for vitals, documents, and alerts aboard spacecraft.
Interplanetary Relay	Store-and-Forward Outbox	Synchronous HTTP	Accommodates multi-minute light-time delay and planetary orbital blackouts.