# Spec Delta: backend-api

## ADDED Requirements

### Requirement: Translation Statistics Endpoint
The system SHALL provide a new admin API endpoint for translation usage statistics across all users.

#### Scenario: Admin requests translation statistics
- GIVEN the admin is authenticated
- WHEN GET /api/v2/admin/translation-stats is called
- THEN the response contains:
  - total_translations: number of translation jobs
  - total_input_tokens: sum of input tokens used
  - total_output_tokens: sum of output tokens used
  - estimated_cost: calculated cost based on token pricing
  - by_language: breakdown of translations by target language
  - recent_translations: list of recent translation activities

#### Scenario: Non-admin user requests translation statistics
- GIVEN a regular user is authenticated
- WHEN GET /api/v2/admin/translation-stats is called
- THEN the response is 403 Forbidden