Architecture Decisions Log (ADR)

Decision	Chosen Option	Alternative Considered	Deciding Factor
Runtime	Node.js 20+	Python Django	Event loop non-blocking I/O efficiency for concurrent WebSocket connections.
Job Queue	BullMQ	Apache Kafka	Native delayed jobs and low operational overhead using existing Redis instances.
Logging	Pino	Winston	Ultra-low CPU overhead and structured JSON output for log aggregators.