Device Management & API Key System

[dmitrytrager]

Create Device model and API key generation

• Add Device model with fields: id, name, api_key, language_id, created_at, updated_at
• Implement secure API key generation (format: sk_live_xxxxxxxxxxxxxxxx)
• Ensure API keys are unique and can identify devices
• Add ability to revoke/regenerate API keys
• Create join tables for device-provider and device-topic assignments (should we consider regions?)