Introduce programmatic API features and observability: add API Key management, API usage analytics, webhook event subscriptions, and OpenAPI docs. New models (ApiKey, ApiUsageLog, ApiUsageSummary, EventSubscription, EventDelivery), services (api_analytics, api_key, event, openapi), and blueprints (/api-keys, /api-analytics, /event-subscriptions, /docs) were added and registered in create_app. Middleware for API key authentication, buffered analytics logging (with a flush thread), and enhanced rate limiting (custom key function and response headers) were implemented; RBAC was updated to accept API key auth via an auth_required decorator. Background threads for hourly aggregation and event retry were added; security CSP updated to allow resources for Swagger UI. Frontend settings UI and styles were added/updated for API keys and webhooks, and requirements were updated.
Juan Denis