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  "_file": "domain/stack-profiles/deep-stacks-3.yaml",
  "_cluster": "domain",
  "attributes": {
    "displayName": "Event Sourcing / CQRS Stack (TypeScript, NestJS, PostgreSQL, Redis, Docker)",
    "description": "An event-sourced architecture implementing Command Query Responsibility\nSegregation (CQRS) where every state change is captured as an immutable\nevent in an append-only event store backed by PostgreSQL. NestJS\nprovides the application framework with its CQRS module for command\nhandlers, event handlers, and sagas. Redis powers the read-side\nprojections for fast query performance and caches materialized views.\nNATS or RabbitMQ distributes events to downstream consumers for\nbuilding additional read models or triggering side effects. Docker\norchestrates the multi-service deployment. This pattern excels for\ndomains with complex business rules, audit requirements, and temporal\nqueries (what was the state at time T?). The tradeoff is significant\ncognitive overhead — developers must reason about eventual consistency,\nevent schema evolution, and projection rebuilds.\n",
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