Update an assistant

{
    "assistant": {
        "id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
        "name": "Customer Support Agent",
        "business_name": "Acme Corp",
        "notification_email": "support@acme.com",
        "first_message": "Hello, welcome to Acme. How can I help you today?",
        "is_active": true,
        "max_duration_seconds": 300,
        "autonomous_silence_handling": false,
        "silence_timeout_seconds": 8,
        "voicemail_detection": false,
        "voicemail_message": "Hello, this is Acme Corp. We will call you back at a later time. Thank you!",
        "gdpr_mode": false,
        "webhook_url": "http://example.com",
        "webhook_secret": "string",
        "webhook_events": [
            "string"
        ],
        "analysis_plan": {
            "structured_data_plan": {
                "enabled": true,
                "schema": {
                    "type": "object",
                    "properties": {
                        "intent": {
                            "type": "string"
                        },
                        "sentiment": {
                            "type": "string",
                            "enum": [
                                "positive",
                                "neutral",
                                "negative"
                            ]
                        },
                        "appointment_booked": {
                            "type": "boolean"
                        }
                    }
                },
                "messages": [
                    {
                        "role": "system",
                        "content": "Analyze the following call transcript according to this schema: {{schema}}"
                    }
                ]
            },
            "min_messages_threshold": 2
        },
        "stt_config": {
            "provider": "deepgram",
            "model": "nova-3-general",
            "language": "multi",
            "keyterms": [
                "yes",
                "no",
                "okay",
                "Acme"
            ],
            "tag_audio_events": true,
            "include_timestamps": false,
            "sample_rate": 16000,
            "languages": [
                "nl",
                "en"
            ],
            "code_switching": true,
            "region": "eu-west",
            "endpointing": 0.05,
            "custom_vocabulary": [
                "HMS Sovereign",
                "Flireo"
            ],
            "translation_enabled": false,
            "translation_target_languages": [
                "en"
            ]
        },
        "llm_config": {
            "provider": "openai",
            "model": "gpt-5.4",
            "voice": "ara",
            "vertexai": false,
            "location": "europe-west4",
            "analysis_model": "gemini-2.5-flash-lite",
            "temperature": 0.7,
            "messages": [
                {
                    "role": "system",
                    "content": "string"
                }
            ],
            "tools": [
                {
                    "name": "lookup_contact",
                    "description": "Look up contact information by name or phone number",
                    "url": "https://n8n.example.com/webhook/contacts",
                    "async": false,
                    "parameters": {
                        "type": "object",
                        "properties": {
                            "query": {
                                "type": "string",
                                "description": "Name or phone number to search"
                            }
                        },
                        "required": [
                            "query"
                        ]
                    }
                }
            ]
        },
        "tts_config": {
            "provider": "elevenlabs",
            "voice_id": "ukiwGs47sHyibruHJ1vg",
            "model": "eleven_flash_v2_5",
            "language": "nl",
            "stability": 0.5,
            "similarity_boost": 0.75,
            "use_speaker_boost": true,
            "speed": 1,
            "style": 0,
            "instructions": "Speak in a friendly and engaging tone."
        },
        "created_at": "2019-08-24T14:15:22.123Z",
        "updated_at": "2019-08-24T14:15:22.123Z"
    }
}