Łukasz Reszke's wroclove.rb 2023 talk sharing six real-world stories from applying rails_event_store, event-driven architecture and tactical DDD gradually to Trezy, a cash-flow management app. Key lessons: persist webhooks as technical events, use aggregates as the source of truth, encapsulate business rules, and adopt event sourcing step by step without needing greenfield or micro-services.
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