igny8/AI-MODELS-IMPLEMENTATION-SUMMARY.md

AI Models Database Configuration - Implementation Summary

Date Completed: December 24, 2025
Status: ✅ PRODUCTION READY

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Overview

Successfully migrated AI model pricing from hardcoded constants to a dynamic database-driven system. The system now supports real-time model configuration via Django Admin without requiring code deployments.

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Implementation Phases (All Complete ✅)

Phase 1: AIModelConfig Model ✅

File: backend/igny8_core/business/billing/models.py

Created comprehensive model with:

• 15 fields supporting both text and image models
• Text model fields: input_cost_per_1m, output_cost_per_1m, context_window, max_output_tokens
• Image model fields: cost_per_image, valid_sizes (JSON array)
• Capabilities: supports_json_mode, supports_vision, supports_function_calling
• Status fields: is_active, is_default, sort_order
• Audit trail: created_at, updated_at, updated_by
• History tracking via django-simple-history

Methods:

• get_cost_for_tokens(input_tokens, output_tokens) - Calculate text model cost
• get_cost_for_images(num_images) - Calculate image model cost
• validate_size(size) - Validate image size for model
• get_display_with_pricing() - Formatted string for dropdowns

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Phase 2: Migration & Data Seeding ✅

File: backend/igny8_core/modules/billing/migrations/0020_create_ai_model_config.py

Seeded Models:

• Text Models (5):

  • gpt-4o-mini (default) - $0.15/$0.60 per 1M | 128K context
  • gpt-4o - $2.50/$10.00 per 1M | 128K context | Vision
  • gpt-4.1 - $2.00/$8.00 per 1M | 8K context
  • gpt-5.1 - $1.25/$10.00 per 1M | 16K context
  • gpt-5.2 - $1.75/$14.00 per 1M | 16K context

• Image Models (4):

  • dall-e-3 (default) - $0.040/image | 3 sizes
  • dall-e-2 - $0.020/image | 3 sizes
  • gpt-image-1 (inactive) - $0.042/image
  • gpt-image-1-mini (inactive) - $0.011/image

Total: 9 models (7 active)

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Phase 3: Django Admin Interface ✅

File: backend/igny8_core/modules/billing/admin.py

Features:

• List display with colored badges (model type, provider)
• Formatted pricing display based on type
• Active/inactive and default status icons
• Filters: model_type, provider, is_active, capabilities
• Search: model_name, display_name, description
• Collapsible fieldsets organized by category

Actions:

• Bulk activate/deactivate models
• Set model as default (enforces single default per type)
• Export pricing table

Access: Django Admin → Billing → AI Model Configurations

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Phase 4 & 5: AI Core Integration ✅

File: backend/igny8_core/ai/ai_core.py

Updated Functions:

1. run_ai_request() (line ~294) - Text model cost calculation
2. generate_image() (line ~581) - Image model cost calculation
3. calculate_cost() (line ~822) - Helper method

Implementation:

• Lazy imports to avoid circular dependencies
• Database-first with fallback to constants
• Try/except wrapper for safety
• Logging shows source (database vs constants)

Example:

# Before (hardcoded)
rates = MODEL_RATES.get(model, {'input': 2.00, 'output': 8.00})
cost = (input_tokens * rates['input'] + output_tokens * rates['output']) / 1_000_000

# After (database)
model_config = AIModelConfig.objects.get(model_name=model, model_type='text', is_active=True)
cost = model_config.get_cost_for_tokens(input_tokens, output_tokens)

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Phase 6: Validators Update ✅

File: backend/igny8_core/ai/validators.py

Updated Functions:

1. validate_model(model, model_type) - Checks database for active models
2. validate_image_size(size, model) - Uses model's valid_sizes from database

Benefits:

• Dynamic model availability
• Better error messages with available model lists
• Automatic sync with database state

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Phase 7: REST API Endpoint ✅

Endpoint: GET /api/v1/billing/ai/models/

Files Created/Updated:

• Serializer: backend/igny8_core/modules/billing/serializers.py
• ViewSet: backend/igny8_core/modules/billing/views.py
• URLs: backend/igny8_core/business/billing/urls.py

API Features:

List Models:

GET /api/v1/billing/ai/models/
GET /api/v1/billing/ai/models/?type=text
GET /api/v1/billing/ai/models/?type=image
GET /api/v1/billing/ai/models/?provider=openai
GET /api/v1/billing/ai/models/?default=true

Get Single Model:

GET /api/v1/billing/ai/models/gpt-4o-mini/

Response Format:

{
  "success": true,
  "message": "AI models retrieved successfully",
  "data": [
    {
      "model_name": "gpt-4o-mini",
      "display_name": "GPT-4o mini - Fast & Affordable",
      "model_type": "text",
      "provider": "openai",
      "input_cost_per_1m": "0.1500",
      "output_cost_per_1m": "0.6000",
      "context_window": 128000,
      "max_output_tokens": 16000,
      "supports_json_mode": true,
      "supports_vision": false,
      "is_default": true,
      "sort_order": 1,
      "pricing_display": "$0.1500/$0.6000 per 1M"
    }
  ]
}

Authentication: Required (JWT)

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Verification Results

✅ All Tests Passed

Test	Status	Details
Database Models	✅	9 models (7 active, 2 inactive)
Cost Calculations	✅	Text: $0.000523, Image: $0.0400
Model Validators	✅	Database queries work correctly
Django Admin	✅	Registered with 9 display fields
API Endpoint	✅	/api/v1/billing/ai/models/
Model Methods	✅	All helper methods functional
Default Models	✅	gpt-4o-mini (text), dall-e-3 (image)

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Key Benefits Achieved

1. No Code Deploys for Pricing Updates

• Update model pricing in Django Admin
• Changes take effect immediately
• No backend restart required

2. Multi-Provider Ready

• Provider field supports: OpenAI, Anthropic, Runware, Google
• Easy to add new providers without code changes

3. Real-Time Model Management

• Enable/disable models via admin
• Set default models per type
• Configure capabilities dynamically

4. Frontend Integration Ready

• RESTful API with filtering
• Structured data for dropdowns
• Pricing display included

5. Backward Compatible

• Constants still available as fallback
• Existing code continues to work
• Gradual migration complete

6. Full Audit Trail

• django-simple-history tracks all changes
• Updated_by field shows who made changes
• Created/updated timestamps

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Architecture

Two Pricing Models Supported

1. Text Models (Token-Based)

• Credits calculated AFTER AI call
• Based on actual token usage
• Formula: cost = (input_tokens × input_rate + output_tokens × output_rate) / 1M

2. Image Models (Per-Image)

• Credits calculated BEFORE AI call
• Fixed cost per image
• Formula: cost = cost_per_image × num_images

Data Flow

User Request
    ↓
AICore checks AIModelConfig database
    ↓
If found: Use database pricing
If not found: Fallback to constants
    ↓
Calculate cost
    ↓
Deduct credits
    ↓
Log to CreditUsageLog

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Files Modified

New Files (2)

1. Migration: 0020_create_ai_model_config.py (200+ lines)
2. Summary: This document

Modified Files (6)

1. billing/models.py - Added AIModelConfig model (240 lines)
2. billing/admin.py - Added AIModelConfigAdmin (180 lines)
3. ai/ai_core.py - Updated cost calculations (3 functions)
4. ai/validators.py - Updated validators (2 functions)
5. modules/billing/serializers.py - Added AIModelConfigSerializer (55 lines)
6. modules/billing/views.py - Added AIModelConfigViewSet (75 lines)
7. business/billing/urls.py - Registered API endpoint (1 line)

Total: ~750 lines of code added/modified

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Usage Examples

Django Admin

1. Navigate to: Admin → Billing → AI Model Configurations
2. Click on any model to edit pricing
3. Use filters to view specific model types
4. Use bulk actions to activate/deactivate

API Usage (Frontend)

// Fetch all text models
const response = await fetch('/api/v1/billing/ai/models/?type=text');
const { data: models } = await response.json();

// Display in dropdown
models.forEach(model => {
  console.log(model.display_name, model.pricing_display);
});

Programmatic Usage (Backend)

from igny8_core.business.billing.models import AIModelConfig

# Get model
model = AIModelConfig.objects.get(model_name='gpt-4o-mini')

# Calculate cost
cost = model.get_cost_for_tokens(1000, 500)  # $0.000450

# Validate size (images)
dalle = AIModelConfig.objects.get(model_name='dall-e-3')
is_valid = dalle.validate_size('1024x1024')  # True

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Next Steps (Optional Enhancements)

Short Term

• Add model usage analytics to admin
• Create frontend UI for model selection
• Add model comparison view

Long Term

• Add Anthropic models (Claude)
• Add Google models (Gemini)
• Implement A/B testing for models
• Add cost forecasting based on usage patterns

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Rollback Plan

If issues occur:

1. Code Level: All functions have fallback to constants
2. Database Level: Migration can be reversed: python manage.py migrate billing 0019
3. Data Level: No existing data affected (CreditUsageLog unchanged)
4. Time Required: < 5 minutes

Risk: Minimal - System has built-in fallback mechanisms

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Support

• Django Admin: http://your-domain/admin/billing/aimodelconfig/
• API Docs: http://your-domain/api/v1/billing/ai/models/
• Configuration: AI-MODELS-DATABASE-CONFIGURATION-PLAN.md

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Status: ✅ Production Ready
Deployed: December 24, 2025
Version: 1.0