---
type: Session Log
date: 2026-01-15
participants:
  - Senior Backend Developer
  - User
topic: Backend Infrastructure Analysis & Ping Service Hardening
status: BLOCKED
---

# Session Log: Backend Infrastructure Analysis

## 1. Context
The goal was to start "Phase 1: Backend Hardening" for the `ping-service` as defined in the Master Roadmap. The Senior Backend Developer began analyzing the existing infrastructure to ensure a solid foundation before implementing security and resilience features.

## 2. Key Findings & Analysis
A deep dive into `backend/infrastructure` revealed significant inconsistencies:

*   **Persistence Conflict (Blocker):**
    *   `ping-service` is configured for **JPA/Hibernate** (`spring-boot-starter-data-jpa`).
    *   The shared library `backend/infrastructure/persistence` (specifically `DatabaseUtils.kt`) is built exclusively for **Exposed** (Kotlin SQL Framework).
    *   This creates a "split-brain" situation regarding ORM strategy.

*   **Missing Security Infrastructure:**
    *   No shared security module exists (`backend/infrastructure/security`).
    *   Implementing OAuth2/RBAC directly in `ping-service` would violate DRY principles.

*   **Messaging Overhead:**
    *   `backend/infrastructure/messaging` includes heavy Kafka dependencies.
    *   It is unclear if the "Tracer Bullet" (Ping Service) requires Kafka or if a simple REST-based Delta-Sync is sufficient.

## 3. Actions Taken
*   Analyzed `build.gradle.kts` of `ping-service` and infrastructure modules.
*   Identified the blocking architectural questions.
*   **Created Pending ADR:** `docs/01_Architecture/adr/000-PENDING-backend-infrastructure-decisions.md` containing a catalog of questions for the Lead Architect.

## 4. Next Steps
*   **WAITING FOR:** Lead Architect to resolve the JPA vs. Exposed decision.
*   **WAITING FOR:** Decision on extracting a shared security module.
*   Once decisions are made, the Backend Developer will proceed with:
    1.  Refactoring persistence (either removing JPA or rewriting infrastructure).
    2.  Implementing the Security Hardening.

## 5. Artifacts Created
*   `docs/01_Architecture/adr/000-PENDING-backend-infrastructure-decisions.md`

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