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+# Banatie REST API Implementation Plan
+
+**Version:** 2.0
+**Status:** Ready for Implementation
+**Executor:** Claude Code
+**Database Schema:** v2.0 (banatie-database-design.md)
+
+---
+
+## Overview
+
+REST API for Banatie image generation service. All endpoints use `/api/v1/` prefix for versioning.
+
+**Core Features:**
+- AI image generation with Google Gemini Flash
+- Dual alias system (project-scoped + flow-scoped)
+- Technical aliases (@last, @first, @upload)
+- Flow-based generation chains
+- Live generation endpoint with caching
+- Upload and reference images
+
+**Authentication:** API keys only (`bnt_` prefix)
+
+---
+
+## Authentication
+
+All endpoints require API key in header:
+
+```
+X-API-Key: bnt_xxx...
+```
+
+**API Key Types:**
+- `master`: Full access to all projects in organization
+- `project`: Access to specific project only
+
+**Unauthorized Response (401):**
+```json
+{
+  "error": "Unauthorized",
+  "message": "Invalid or missing API key"
+}
+```
+
+---
+
+## Implementation Phases
+
+### Phase 1: Foundation
+**Goal:** Core utilities and services
+
+**Tasks:**
+- Create TypeScript type definitions for all models
+- Build validation utilities (alias format, pagination, query params)
+- Build helper utilities (pagination, hash, query helpers)
+- Create `AliasService` with 3-tier resolution (technical → flow → project)
+
+**Git Commit:**
+```
+feat: add foundation utilities and alias service
+```
+
+---
+
+### Phase 2: Core Generation Flow
+**Goal:** Main generation endpoints
+
+**Services:**
+- `ImageService` - CRUD operations with soft delete
+- `GenerationService` - Full lifecycle management
+
+**Endpoints:**
+- `POST /api/v1/generations` - Create with reference images & dual aliases
+- `GET /api/v1/generations` - List with filters
+- `GET /api/v1/generations/:id` - Get details with related data
+
+**Git Commit:**
+```
+feat: implement core generation endpoints
+```
+
+---
+
+### Phase 3: Flow Management
+**Goal:** Flow operations
+
+**Services:**
+- `FlowService` - CRUD with computed counts & alias management
+
+**Endpoints:**
+- `POST /api/v1/flows` - Create flow
+- `GET /api/v1/flows` - List flows with computed counts
+- `GET /api/v1/flows/:id` - Get details with generations and images
+- `PUT /api/v1/flows/:id/aliases` - Update flow aliases
+- `DELETE /api/v1/flows/:id/aliases/:alias` - Remove specific alias
+- `DELETE /api/v1/flows/:id` - Delete flow
+
+**Git Commit:**
+```
+feat: implement flow management endpoints
+```
+
+---
+
+### Phase 4: Enhanced Image Management
+**Goal:** Complete image operations
+
+**Endpoints:**
+- `POST /api/v1/images/upload` - Upload with alias, flow, metadata
+- `GET /api/v1/images` - List with filters
+- `GET /api/v1/images/:id` - Get details with usage info
+- `GET /api/v1/images/resolve/:alias` - Resolve alias with precedence
+- `PUT /api/v1/images/:id` - Update metadata
+- `DELETE /api/v1/images/:id` - Soft/hard delete
+
+**Git Commit:**
+```
+feat: implement image management endpoints
+```
+
+---
+
+### Phase 5: Generation Refinements
+**Goal:** Additional generation operations
+
+**Endpoints:**
+- `POST /api/v1/generations/:id/retry` - Retry failed generation
+- `DELETE /api/v1/generations/:id` - Delete generation
+
+**Git Commit:**
+```
+feat: add generation retry and delete endpoints
+```
+
+---
+
+### Phase 6: Live Generation
+**Goal:** URL-based generation with caching
+
+**Services:**
+- `PromptCacheService` - SHA-256 caching with hit tracking
+
+**Endpoints:**
+- `GET /api/v1/live` - Generate image via URL with streaming proxy
+
+**Important:** Stream image directly from MinIO (no 302 redirect) for better performance.
+
+**Git Commit:**
+```
+feat: implement live generation endpoint with caching
+```
+
+---
+
+### Phase 7: Analytics
+**Goal:** Project statistics and metrics
+
+**Services:**
+- `AnalyticsService` - Aggregation queries
+
+**Endpoints:**
+- `GET /api/v1/analytics/summary` - Project statistics
+- `GET /api/v1/analytics/generations/timeline` - Time-series data
+
+**Git Commit:**
+```
+feat: add analytics endpoints
+```
+
+---
+
+### Phase 8: Testing & Documentation
+**Goal:** Quality assurance
+
+**Tasks:**
+- Unit tests for all services (target >80% coverage)
+- Integration tests for critical flows
+- Error handling consistency review
+- Update API documentation
+
+**Git Commit:**
+```
+test: add comprehensive test coverage and documentation
+```
+
+---
+
+## API Endpoints Specification
+
+### GENERATIONS
+
+#### POST /api/v1/generations
+
+Create new image generation.
+
+**Request Body:**
+```typescript
+{
+  prompt: string;                    // Required: 1-2000 chars
+  aspectRatio?: string;              // Optional: '16:9', '1:1', '4:3', '9:16'
+  width?: number;                    // Optional: 1-8192
+  height?: number;                   // Optional: 1-8192
+  referenceImages?: string[];        // Optional: ['@logo', '@product', '@last']
+  flowId?: string;                   // Optional: Add to existing flow
+  assignAlias?: string;              // Optional: Project-scoped alias '@brand'
+  assignFlowAlias?: string;          // Optional: Flow-scoped alias '@hero' (requires flowId)
+  meta?: Record<string, unknown>;
+}
+```
+
+**Response (200):**
+```typescript
+{
+  generation: Generation;
+  image?: Image;                     // If generation completed
+}
+```
+
+**Errors:** 400, 401, 404, 422, 429, 500
+
+---
+
+#### GET /api/v1/generations
+
+List generations with filtering.
+
+**Query Params:**
+```typescript
+{
+  flowId?: string;
+  status?: 'pending' | 'processing' | 'success' | 'failed';
+  limit?: number;                    // Default: 20, max: 100
+  offset?: number;                   // Default: 0
+  sortBy?: 'createdAt' | 'updatedAt';
+  order?: 'asc' | 'desc';            // Default: desc
+}
+```
+
+**Response (200):**
+```typescript
+{
+  generations: Generation[];
+  pagination: PaginationInfo;
+}
+```
+
+---
+
+#### GET /api/v1/generations/:id
+
+Get generation details.
+
+**Response (200):**
+```typescript
+{
+  generation: Generation;
+  image?: Image;
+  referencedImages: Image[];
+  flow?: FlowSummary;
+}
+```
+
+---
+
+#### POST /api/v1/generations/:id/retry
+
+Retry failed generation.
+
+**Response (200):**
+```typescript
+{
+  generation: Generation;            // New generation with incremented retry_count
+}
+```
+
+**Errors:** 404, 422
+
+---
+
+#### DELETE /api/v1/generations/:id
+
+Delete generation.
+
+**Query Params:**
+```typescript
+{
+  hard?: boolean;                    // Default: false
+}
+```
+
+**Response (204):** No content
+
+---
+
+### IMAGES
+
+#### POST /api/v1/images/upload
+
+Upload image file.
+
+**Request:** multipart/form-data
+
+**Fields:**
+```typescript
+{
+  file: File;                        // Required, max 5MB
+  alias?: string;                    // Project-scoped: '@logo'
+  flowAlias?: string;                // Flow-scoped: '@hero' (requires flowId)
+  flowId?: string;
+  description?: string;
+  tags?: string[];                   // JSON array as string
+  focalPoint?: string;               // JSON: '{"x":0.5,"y":0.5}'
+  meta?: string;                     // JSON object as string
+}
+```
+
+**Response (201):**
+```typescript
+{
+  image: Image;
+  flow?: FlowSummary;                // If flowAlias assigned
+}
+```
+
+**Errors:** 400, 409, 422
+
+---
+
+#### GET /api/v1/images
+
+List images.
+
+**Query Params:**
+```typescript
+{
+  flowId?: string;
+  source?: 'generated' | 'uploaded';
+  alias?: string;
+  limit?: number;                    // Default: 20, max: 100
+  offset?: number;
+  sortBy?: 'createdAt' | 'fileSize';
+  order?: 'asc' | 'desc';
+}
+```
+
+**Response (200):**
+```typescript
+{
+  images: Image[];
+  pagination: PaginationInfo;
+}
+```
+
+---
+
+#### GET /api/v1/images/:id
+
+Get image details.
+
+**Response (200):**
+```typescript
+{
+  image: Image;
+  generation?: Generation;
+  usedInGenerations: GenerationSummary[];
+}
+```
+
+---
+
+#### GET /api/v1/images/resolve/:alias
+
+Resolve alias to image.
+
+**Query Params:**
+```typescript
+{
+  flowId?: string;                   // Provide flow context
+}
+```
+
+**Response (200):**
+```typescript
+{
+  image: Image;
+  scope: 'flow' | 'project' | 'technical';
+  flow?: FlowSummary;
+}
+```
+
+**Resolution Order:**
+1. Technical aliases (@last, @first, @upload) if flowId provided
+2. Flow aliases from flows.aliases if flowId provided
+3. Project aliases from images.alias
+
+**Errors:** 404
+
+---
+
+#### PUT /api/v1/images/:id
+
+Update image metadata.
+
+**Request Body:**
+```typescript
+{
+  alias?: string;
+  description?: string;
+  tags?: string[];
+  focalPoint?: { x: number; y: number };
+  meta?: Record<string, unknown>;
+}
+```
+
+**Response (200):**
+```typescript
+{
+  image: Image;
+}
+```
+
+**Errors:** 404, 409, 422
+
+---
+
+#### DELETE /api/v1/images/:id
+
+Delete image.
+
+**Query Params:**
+```typescript
+{
+  hard?: boolean;                    // Default: false
+}
+```
+
+**Response (204):** No content
+
+---
+
+### FLOWS
+
+#### POST /api/v1/flows
+
+Create new flow.
+
+**Request Body:**
+```typescript
+{
+  meta?: Record<string, unknown>;
+}
+```
+
+**Response (201):**
+```typescript
+{
+  flow: Flow;
+}
+```
+
+---
+
+#### GET /api/v1/flows
+
+List flows.
+
+**Query Params:**
+```typescript
+{
+  limit?: number;                    // Default: 20, max: 100
+  offset?: number;
+  sortBy?: 'createdAt' | 'updatedAt';
+  order?: 'asc' | 'desc';
+}
+```
+
+**Response (200):**
+```typescript
+{
+  flows: Array<Flow & {
+    generationCount: number;         // Computed
+    imageCount: number;              // Computed
+  }>;
+  pagination: PaginationInfo;
+}
+```
+
+---
+
+#### GET /api/v1/flows/:id
+
+Get flow details.
+
+**Response (200):**
+```typescript
+{
+  flow: Flow;
+  generations: Generation[];         // Ordered by created_at ASC
+  images: Image[];
+  resolvedAliases: Record<string, Image>;
+}
+```
+
+---
+
+#### PUT /api/v1/flows/:id/aliases
+
+Update flow aliases.
+
+**Request Body:**
+```typescript
+{
+  aliases: Record<string, string>;   // { "@hero": "image-uuid" }
+}
+```
+
+**Response (200):**
+```typescript
+{
+  flow: Flow;
+}
+```
+
+**Validation:**
+- Keys must match `^@[a-zA-Z0-9_-]+$`
+- Values must be valid image UUIDs
+- Cannot use reserved: @last, @first, @upload
+
+**Errors:** 404, 422
+
+---
+
+#### DELETE /api/v1/flows/:id/aliases/:alias
+
+Remove specific alias from flow.
+
+**Response (204):** No content
+
+**Errors:** 404
+
+---
+
+#### DELETE /api/v1/flows/:id
+
+Delete flow.
+
+**Response (204):** No content
+
+**Note:** Cascades to images, sets NULL on generations.flow_id
+
+---
+
+### LIVE GENERATION
+
+#### GET /api/v1/live
+
+Generate image via URL with caching and streaming.
+
+**Query Params:**
+```typescript
+{
+  prompt: string;                    // Required
+  aspectRatio?: string;
+  width?: number;
+  height?: number;
+  reference?: string | string[];     // '@logo' or ['@logo','@style']
+}
+```
+
+**Response:** Image stream with headers
+
+**Headers:**
+```
+Content-Type: image/jpeg
+Cache-Control: public, max-age=31536000
+X-Cache-Status: HIT | MISS
+```
+
+**Implementation:**
+1. Compute cache key: SHA256(prompt + sorted params)
+2. Check prompt_url_cache table
+3. If HIT: increment hit_count, stream from MinIO
+4. If MISS: generate, cache, stream from MinIO
+5. Stream image bytes directly (no 302 redirect)
+
+**Errors:** 400, 404, 500
+
+---
+
+### ANALYTICS
+
+#### GET /api/v1/analytics/summary
+
+Get project statistics.
+
+**Query Params:**
+```typescript
+{
+  startDate?: string;                // ISO 8601
+  endDate?: string;
+  flowId?: string;
+}
+```
+
+**Response (200):**
+```typescript
+{
+  period: { startDate: string; endDate: string };
+  metrics: {
+    totalGenerations: number;
+    successfulGenerations: number;
+    failedGenerations: number;
+    successRate: number;
+    totalImages: number;
+    uploadedImages: number;
+    generatedImages: number;
+    avgProcessingTimeMs: number;
+    totalCacheHits: number;
+    cacheHitRate: number;
+    totalCost: number;
+  };
+  flows: FlowSummary[];
+}
+```
+
+---
+
+#### GET /api/v1/analytics/generations/timeline
+
+Get generation statistics over time.
+
+**Query Params:**
+```typescript
+{
+  startDate?: string;
+  endDate?: string;
+  flowId?: string;
+  groupBy?: 'hour' | 'day' | 'week'; // Default: day
+}
+```
+
+**Response (200):**
+```typescript
+{
+  data: Array<{
+    timestamp: string;
+    total: number;
+    successful: number;
+    failed: number;
+    avgProcessingTimeMs: number;
+  }>;
+}
+```
+
+---
+
+## Implementation Guidelines
+
+### Alias Resolution Algorithm
+
+**Priority Order:**
+1. Technical aliases (@last, @first, @upload) - compute from flow data
+2. Flow-scoped aliases - from flows.aliases JSONB
+3. Project-scoped aliases - from images.alias column
+
+**Technical Aliases:**
+- `@last`: Latest generation output in flow (any status)
+- `@first`: First generation output in flow
+- `@upload`: Latest uploaded image in flow
+
+### Dual Alias Assignment
+
+When creating generation or uploading image:
+- `assignAlias` → set images.alias (project scope)
+- `assignFlowAlias` → add to flows.aliases (flow scope)
+- Both can be assigned simultaneously
+
+### Flow Updates
+
+Update `flows.updated_at` on:
+- New generation created with flowId
+- New image uploaded with flowId
+- Flow aliases modified
+
+### Audit Trail
+
+Track `api_key_id` in:
+- `images.api_key_id` - who uploaded/generated
+- `generations.api_key_id` - who requested
+
+### Rate Limiting
+
+In-memory rate limiting (defer Redis for MVP):
+- Master key: 1000 req/hour, 100 generations/hour
+- Project key: 500 req/hour, 50 generations/hour
+
+**Headers:**
+```
+X-RateLimit-Limit: 500
+X-RateLimit-Remaining: 487
+X-RateLimit-Reset: 1698765432
+```
+
+### Error Response Format
+
+```typescript
+{
+  error: string;
+  message: string;
+  details?: unknown;
+  requestId?: string;
+}
+```
+
+### MinIO Integration
+
+Use streaming for `/api/v1/live`:
+```typescript
+const stream = await minioClient.getObject(bucket, storageKey);
+res.set('Content-Type', mimeType);
+stream.pipe(res);
+```
+
+Generate presigned URLs for other endpoints:
+```typescript
+const url = await minioClient.presignedGetObject(bucket, storageKey, 24 * 60 * 60);
+```
+
+---
+
+## Validation Rules
+
+**Alias Format:**
+- Pattern: `^@[a-zA-Z0-9_-]+$`
+- Reserved: @last, @first, @upload
+- Length: 3-100 chars
+
+**File Upload:**
+- Max size: 5MB
+- MIME types: image/jpeg, image/png, image/webp
+- Max dimensions: 8192x8192
+
+**Prompt:**
+- Min: 1 char
+- Max: 2000 chars
+
+**Aspect Ratio:**
+- Pattern: `^\d+:\d+$`
+- Examples: 16:9, 1:1, 4:3, 9:16
+
+---
+
+## Service Architecture
+
+### Core Services
+
+**AliasService:**
+- Resolve aliases with 3-tier precedence
+- Compute technical aliases
+- Validate alias format
+
+**ImageService:**
+- CRUD operations
+- Soft delete support
+- Usage tracking
+
+**GenerationService:**
+- Generation lifecycle
+- Status transitions
+- Error handling
+- Retry logic
+
+**FlowService:**
+- Flow CRUD
+- Alias management
+- Computed counts
+
+**PromptCacheService:**
+- Cache key computation (SHA-256)
+- Hit tracking
+- Cache lookup
+
+**AnalyticsService:**
+- Aggregation queries
+- Time-series grouping
+
+### Reusable Utilities
+
+**Validators:**
+- Alias format
+- Pagination params
+- Query filters
+
+**Helpers:**
+- Pagination builder
+- SHA-256 hashing
+- Query helpers
+
+---
+
+## Testing Requirements
+
+**Unit Tests:**
+- All services must have unit tests
+- Target coverage: >80%
+- Mock database calls
+
+**Integration Tests:**
+- Critical flows end-to-end
+- Real database transactions
+- API endpoint testing with supertest
+
+**Test Scenarios:**
+- Alias resolution precedence
+- Flow-scoped vs project-scoped aliases
+- Technical alias computation
+- Dual alias assignment
+- Cache hit/miss behavior
+- Error handling
+- Rate limiting
+
+---
+
+## Success Criteria
+
+✅ All endpoints functional per specification
+✅ >80% test coverage on services
+✅ Consistent error handling across all endpoints
+✅ All validation rules implemented
+✅ Rate limiting working
+✅ Documentation updated
+✅ Git commits after each phase
+
+---
+
+*Document Version: 2.0*
+*Created: 2025-11-09*
+*Target: Claude Code Implementation*
+*Database Schema: v2.0*