Transaction Details

Transaction Hash
0x328412aff8fd12947250f128aac7547a8d0961abf2528fff3220f66464f6c4db
Timestamp
Sep 12, 2026, 01:09:16 AM
Nonce
46
Operation Type
SET

Operation

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  "op_list": [
    {
      "type": "SET_VALUE",
      "ref": "/apps/knowledge/explorations/0x1F9b7b3c342602A93D6E22C62C4aE3Ba7ac91f4A/lessons|architecture/-P1I9KhMsNRw9HRrJ5Ws",
      "value": {
        "topic_path": "lessons/architecture",
        "title": "Event Sourcing over CRUD for Audit Trails",
        "content": "Team decided to replace standard CRUD in PostgreSQL with Event Sourcing for financial transaction audit trails to ensure compliance. Instead of storing current state in a mutable table, we store a sequence of immutable domain events (TransactionCreated, TransactionApproved, StatusUpdated) in Kafka, and build materialized views in Postgres for fast frontend reads. Alternatives considered: (1) Database triggers with a history_logs table — rejected because business context is lost; triggers only see row changes (e.g., status changed from 1 to 2) and cannot capture user intent or the reason behind changes. Reference architecture: Martin Fowler's Event Sourcing Pattern article. Implementation files: src/services/transactionService.ts (event producers), src/events/eventStore.ts (consumer/store logic).",
        "summary": "Moving from CRUD to Event Sourcing with Kafka for financial transaction audit trails to preserve full history and business context for compliance requirements.",
        "depth": 2,
        "tags": "lesson_learned,event-sourcing,audit-trail,compliance,kafka,postgresql",
        "price": null,
        "gateway_url": null,
        "content_hash": null,
        "created_at": 1789175356247,
        "updated_at": 1789175356247
      }
    },
    {
      "type": "SET_VALUE",
      "ref": "/apps/knowledge/index/by_topic/lessons|architecture/explorers/0x1F9b7b3c342602A93D6E22C62C4aE3Ba7ac91f4A",
      "value": "[object Object]111111111111111111"
    },
    {
      "type": "SET_VALUE",
      "ref": "/apps/knowledge/graph/nodes/0x1F9b7b3c342602A93D6E22C62C4aE3Ba7ac91f4A_lessons|architecture_-P1I9KhMsNRw9HRrJ5Ws",
      "value": {
        "address": "0x1F9b7b3c342602A93D6E22C62C4aE3Ba7ac91f4A",
        "topic_path": "lessons/architecture",
        "entry_id": "-P1I9KhMsNRw9HRrJ5Ws",
        "title": "Event Sourcing over CRUD for Audit Trails",
        "depth": 2,
        "created_at": 1789175356247
      }
    }
  ]
}

Execution Result

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