# PERFORMANCE AUDIT — BANK SAMPAH FAPERTA

Dokumen ini digunakan untuk audit performa sistem Bank Sampah Faperta, mencakup backend, database, frontend, dan arsitektur caching.

---

# 1. PERFORMANCE OBJECTIVE

Tujuan:

- memastikan sistem responsif di load normal
- mencegah bottleneck pada transaksi finansial
- menghindari N+1 query
- memastikan scaling tetap stabil
- mengoptimalkan frontend rendering

---

# 2. BACKEND PERFORMANCE

## 2.1 Controller Layer

Checklist:

- [ ] Controller tidak menjalankan query kompleks
- [ ] Tidak ada loop query database
- [ ] Semua logic berat dipindah ke service

---

## 2.2 Service Layer

Checklist:

- [ ] Query dioptimalkan
- [ ] Tidak ada repeated computation
- [ ] Financial calculation hanya sekali per request

---

## 2.3 Database Query Optimization

Wajib:

- eager loading (`with`)
- select specific columns
- indexed foreign keys
- avoid N+1 query

---

## ANTI-PATTERN

Dilarang:

- query dalam loop
- repeated count query
- loading relationship tanpa eager loading

---

# 3. DATABASE PERFORMANCE

## 3.1 Indexing Rules

Wajib index:

- user_id (semua transaksi)
- deposit_id
- withdrawal_id
- created_at (filtering)
- status fields

---

## 3.2 Query Optimization

Checklist:

- [ ] gunakan pagination untuk semua list besar
- [ ] hindari full table scan
- [ ] gunakan composite index jika perlu

---

## 3.3 Financial Tables (CRITICAL)

Tabel:

- deposits
- withdrawals
- mutations

Rules:

- semua harus optimized read/write
- mutation table harus append-only
- hindari update massal

---

# 4. FRONTEND PERFORMANCE

## 4.1 React (Inertia)

Checklist:

- [ ] component reusable
- [ ] avoid unnecessary re-render
- [ ] use memoization jika perlu
- [ ] props minimal & clean

---

## 4.2 Asset Optimization

Checklist:

- [ ] Vite build production optimized
- [ ] image compression aktif
- [ ] lazy loading untuk image
- [ ] code splitting untuk page besar

---

# 5. CACHING STRATEGY

## 5.1 Dashboard Cache

- cache duration: 5 menit
- digunakan untuk:
    - total saldo
    - total transaksi
    - statistik user

Checklist:

- [ ] cache hit ratio tinggi
- [ ] cache invalidation on transaction

---

## 5.2 Query Cache (optional)

- hanya untuk read-heavy data
- contoh:
    - artikel
    - harga sampah

---

# 6. QUEUE SYSTEM PERFORMANCE

## 6.1 Use Cases

Queue wajib untuk:

- email notification
- gamification update
- heavy aggregation
- report generation

---

## 6.2 Rules

Checklist:

- [ ] queue tidak blocking request utama
- [ ] retry mechanism aktif
- [ ] failed job logging aktif

---

# 7. N+1 QUERY PREVENTION

## DETECTION AREA

- user → deposits
- deposit → items
- withdrawal → history
- pickup → user relation

---

## RULE

Dilarang:

oreach(user as u) {
u->deposits
}

Wajib:

User::with('deposits')->get()

---

# 8. SCALABILITY DESIGN

## 8.1 Horizontal Scaling Readiness

- stateless backend
- session via DB/Redis
- queue-based processing

---

## 8.2 Modular Growth

System siap untuk:

- API layer
- mobile app
- microservices (future)
- event streaming (future)

---

# 9. HEAVY OPERATIONS CONTROL

## Identified Heavy Operations

- gamification calculation
- dashboard aggregation
- mutation ledger recalculation

---

## RULE

Heavy operations:

- must be cached OR queued
- never executed in controller directly

---

# 10. FRONTEND LOAD PERFORMANCE

Checklist:

- [ ] initial page load < 2s
- [ ] lazy load routes
- [ ] minimal bundle size
- [ ] avoid large dependency imports

---

# 11. MEMORY & RESOURCE USAGE

Checklist:

- [ ] no memory leak in loops
- [ ] avoid large dataset loading
- [ ] pagination enforced

---

# 12. PERFORMANCE ANTI-PATTERN

Dilarang:

- loading semua data tanpa filter
- nested eager loading berlebihan
- repeated DB calls di service loop
- unoptimized chart data aggregation

---

# 13. MONITORING STRATEGY

Checklist:

- [ ] log slow query
- [ ] track failed jobs
- [ ] monitor transaction latency
- [ ] track cache hit rate

---

# 14. PERFORMANCE ACCEPTANCE CRITERIA

Sistem dianggap optimal jika:

- no N+1 query detected
- transaction response < 300ms (avg)
- dashboard load < 2s
- no blocking queue job
- cache hit > 70%

---

# 15. FINAL PERFORMANCE PRINCIPLE

> Performance is not optimization at the end, it is architecture from the beginning.

Semua fitur baru harus mempertimbangkan dampak performa sejak desain awal.