erDiagram
    providers ||--o{ provider_usage_logs : has
    providers ||--o{ cooldown_events : triggers
    providers ||--o| provider_health : monitors

    providers {
        string id PK
        string name
        string api_key
        string endpoint_url
        string model_prefix
        string pool
        string status
        string source
        int rpm_limit
        int tpm_limit
        float weight
        float cost_per_1k
        string cooldown_until
        string metadata
    }

    provider_usage_logs {
        string id PK
        string provider_id FK
        string model
        int prompt_tokens
        int completion_tokens
        int total_tokens
        float cost
        int request_count
        int error_count
        int avg_latency_ms
        string hour_bucket
    }

    cooldown_events {
        string id PK
        string provider_id FK
        int consecutive_count
        int cooldown_seconds
        string response_summary
        string started_at
        string ended_at
    }

    provider_health {
        string provider_id PK
        string state
        int last_latency_ms
        int last_status_code
        float success_rate_5m
        int consecutive_failures
    }

    daily_stats {
        string id PK
        string date
        string pool
        int total_requests
        int total_errors
        int total_tokens
        float total_cost
        int unique_providers
    }

    system_config {
        string key PK
        string value
        string description
    }