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+# Unified API Gateway Design
+
+**Date**: 2025-01-27
+**Purpose**: Design document for unified API gateway
+**Status**: Design Document
+
+---
+
+## Executive Summary
+
+This document outlines the design for a unified API gateway that will serve as a single entry point for all workspace projects, providing centralized authentication, rate limiting, and API versioning.
+
+---
+
+## Architecture Overview
+
+### Components
+
+1. **API Gateway** (Kong, Traefik, or custom)
+2. **Authentication Service** (Keycloak, Auth0, or custom)
+3. **Rate Limiting Service** (Redis-based)
+4. **API Versioning** (Path-based or header-based)
+5. **Monitoring & Logging** (Prometheus, Grafana, Loki)
+
+### Architecture Diagram
+
+```
+Client
+  ↓
+API Gateway (Kong/Traefik)
+  ├── Authentication Layer
+  ├── Rate Limiting
+  ├── Request Routing
+  └── Response Aggregation
+  ↓
+Backend Services
+  ├── dbis_core
+  ├── the_order
+  ├── Sankofa
+  └── Other services
+```
+
+---
+
+## Features
+
+### 1. Authentication & Authorization
+
+**Methods**:
+- JWT tokens
+- API keys
+- OAuth2/OIDC
+- mTLS (for service-to-service)
+
+**Implementation**:
+- Centralized authentication service
+- Token validation
+- Role-based access control (RBAC)
+- Permission checking
+
+### 2. Rate Limiting
+
+**Strategies**:
+- Per-user rate limits
+- Per-API rate limits
+- Per-IP rate limits
+- Tiered rate limits (free, paid, enterprise)
+
+**Storage**: Redis for distributed rate limiting
+
+### 3. API Versioning
+
+**Strategy**: Path-based versioning
+- `/v1/api/...`
+- `/v2/api/...`
+
+**Alternative**: Header-based (`Accept: application/vnd.api+json;version=2`)
+
+### 4. Request Routing
+
+**Features**:
+- Path-based routing
+- Header-based routing
+- Load balancing
+- Health checks
+- Circuit breakers
+
+### 5. Monitoring & Observability
+
+**Metrics**:
+- Request rate
+- Response times
+- Error rates
+- Authentication failures
+- Rate limit hits
+
+**Logging**:
+- All requests logged
+- Structured logging (JSON)
+- Centralized log aggregation
+
+---
+
+## Technology Options
+
+### Option 1: Kong Gateway (Recommended)
+
+**Pros**:
+- Feature-rich
+- Plugin ecosystem
+- Good documentation
+- Enterprise support available
+
+**Cons**:
+- More complex setup
+- Higher resource usage
+
+### Option 2: Traefik
+
+**Pros**:
+- Kubernetes-native
+- Auto-discovery
+- Simpler setup
+- Lower resource usage
+
+**Cons**:
+- Fewer built-in features
+- Less mature plugin ecosystem
+
+### Option 3: Custom (Node.js/TypeScript)
+
+**Pros**:
+- Full control
+- Custom features
+- Lightweight
+
+**Cons**:
+- More development time
+- Maintenance burden
+
+**Recommendation**: Kong Gateway for production, Traefik for simpler setups
+
+---
+
+## Implementation Plan
+
+### Phase 1: Basic Gateway (Weeks 1-2)
+- [ ] Deploy API gateway (Kong or Traefik)
+- [ ] Set up basic routing
+- [ ] Configure SSL/TLS
+- [ ] Set up monitoring
+
+### Phase 2: Authentication (Weeks 3-4)
+- [ ] Integrate authentication service
+- [ ] Implement JWT validation
+- [ ] Set up RBAC
+- [ ] Test authentication flow
+
+### Phase 3: Rate Limiting (Weeks 5-6)
+- [ ] Set up Redis for rate limiting
+- [ ] Configure rate limit rules
+- [ ] Implement tiered limits
+- [ ] Test rate limiting
+
+### Phase 4: Advanced Features (Weeks 7-8)
+- [ ] API versioning
+- [ ] Request/response transformation
+- [ ] Caching
+- [ ] WebSocket support
+
+### Phase 5: Migration (Weeks 9-12)
+- [ ] Migrate dbis_core to gateway
+- [ ] Migrate the_order to gateway
+- [ ] Migrate Sankofa to gateway
+- [ ] Migrate other services
+- [ ] Complete testing
+
+---
+
+## Configuration Example
+
+### Kong Gateway Configuration
+
+```yaml
+services:
+  - name: dbis-core
+    url: http://dbis-core:3000
+    routes:
+      - name: dbis-core-v1
+        paths:
+          - /v1/dbis
+        plugins:
+          - name: rate-limiting
+            config:
+              minute: 100
+              hour: 1000
+          - name: jwt
+            config:
+              secret_is_base64: false
+```
+
+### Traefik Configuration
+
+```yaml
+http:
+  routers:
+    dbis-core:
+      rule: "PathPrefix(`/v1/dbis`)"
+      service: dbis-core
+      middlewares:
+        - auth
+        - rate-limit
+  services:
+    dbis-core:
+      loadBalancer:
+        servers:
+          - url: "http://dbis-core:3000"
+```
+
+---
+
+## Security Considerations
+
+### Authentication
+- JWT tokens with short expiration
+- Refresh token rotation
+- Token revocation
+- Secure token storage
+
+### Rate Limiting
+- Prevent DDoS attacks
+- Protect against abuse
+- Fair resource allocation
+
+### Network Security
+- mTLS for service-to-service
+- WAF (Web Application Firewall)
+- DDoS protection
+- IP whitelisting (optional)
+
+---
+
+## Monitoring & Alerting
+
+### Key Metrics
+- Request rate per service
+- Response times (p50, p95, p99)
+- Error rates
+- Authentication failures
+- Rate limit hits
+- Gateway health
+
+### Alerts
+- High error rate
+- Slow response times
+- Authentication failures spike
+- Rate limit exhaustion
+- Gateway downtime
+
+---
+
+## Success Metrics
+
+- [ ] Single entry point for all APIs
+- [ ] Centralized authentication operational
+- [ ] Rate limiting functional
+- [ ] 80% of projects migrated to gateway
+- [ ] 50% reduction in authentication code duplication
+- [ ] Improved API security posture
+
+---
+
+**Last Updated**: 2025-01-27
+**Next Review**: After Phase 1 completion
+