erDiagram
    alerts {
        INTEGER id PK
        INTEGER user_id FK "nullable"
        VARCHAR category 
        VARCHAR level  "nullable"
        VARCHAR title  "nullable"
        TEXT message 
        VARCHAR source  "nullable"
        JSON details  "nullable"
        DATETIME read_at  "nullable"
        DATETIME created_at 
    }
    app_settings {
        VARCHAR key PK
        TEXT value  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
    }
    bootstrap_status {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR status 
        VARCHAR automation_user  "nullable"
        DATETIME last_attempt  "nullable"
        TEXT error_message  "nullable"
        DATETIME created_at 
    }
    container_customizations {
        INTEGER id PK
        INTEGER user_id FK "nullable"
        VARCHAR host_id FK
        VARCHAR container_id 
        VARCHAR icon_key  "nullable"
        VARCHAR icon_color  "nullable"
        VARCHAR bg_color  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
    }
    docker_alerts {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR container_name 
        VARCHAR severity 
        VARCHAR state 
        TEXT message  "nullable"
        DATETIME opened_at 
        DATETIME closed_at  "nullable"
        DATETIME acknowledged_at  "nullable"
        VARCHAR acknowledged_by  "nullable"
        DATETIME last_notified_at  "nullable"
    }
    docker_containers {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR container_id 
        VARCHAR name 
        VARCHAR image  "nullable"
        VARCHAR state 
        VARCHAR status  "nullable"
        VARCHAR health  "nullable"
        DATETIME created_at  "nullable"
        JSON ports  "nullable"
        JSON labels  "nullable"
        VARCHAR compose_project  "nullable"
        DATETIME last_update_at 
    }
    docker_images {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR image_id 
        JSON repo_tags  "nullable"
        BIGINT size  "nullable"
        DATETIME created  "nullable"
        DATETIME last_update_at 
    }
    docker_volumes {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR name 
        VARCHAR driver  "nullable"
        TEXT mountpoint  "nullable"
        VARCHAR scope  "nullable"
        DATETIME last_update_at 
    }
    favorite_containers {
        INTEGER id PK
        INTEGER user_id FK "nullable"
        INTEGER docker_container_id FK
        INTEGER group_id FK "nullable"
        DATETIME created_at 
    }
    favorite_groups {
        INTEGER id PK
        INTEGER user_id FK "nullable"
        VARCHAR name 
        INTEGER sort_order 
        VARCHAR color  "nullable"
        VARCHAR icon_key  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
    }
    host_metrics {
        INTEGER id PK
        VARCHAR host_id FK
        VARCHAR metric_type 
        INTEGER cpu_count  "nullable"
        VARCHAR cpu_model  "nullable"
        INTEGER cpu_cores  "nullable"
        INTEGER cpu_threads  "nullable"
        INTEGER cpu_threads_per_core  "nullable"
        INTEGER cpu_sockets  "nullable"
        FLOAT cpu_mhz  "nullable"
        FLOAT cpu_max_mhz  "nullable"
        FLOAT cpu_min_mhz  "nullable"
        FLOAT cpu_load_1m  "nullable"
        FLOAT cpu_load_5m  "nullable"
        FLOAT cpu_load_15m  "nullable"
        FLOAT cpu_usage_percent  "nullable"
        FLOAT cpu_temperature  "nullable"
        INTEGER memory_total_mb  "nullable"
        INTEGER memory_used_mb  "nullable"
        INTEGER memory_free_mb  "nullable"
        FLOAT memory_usage_percent  "nullable"
        INTEGER swap_total_mb  "nullable"
        INTEGER swap_used_mb  "nullable"
        FLOAT swap_usage_percent  "nullable"
        JSON disk_info  "nullable"
        JSON disk_devices 
        FLOAT disk_root_total_gb  "nullable"
        FLOAT disk_root_used_gb  "nullable"
        FLOAT disk_root_usage_percent  "nullable"
        JSON lvm_info  "nullable"
        JSON zfs_info  "nullable"
        JSON storage_details  "nullable"
        VARCHAR os_name  "nullable"
        VARCHAR os_version  "nullable"
        VARCHAR kernel_version  "nullable"
        VARCHAR hostname  "nullable"
        INTEGER uptime_seconds  "nullable"
        VARCHAR uptime_human  "nullable"
        JSON network_info  "nullable"
        JSON raw_data  "nullable"
        VARCHAR collection_source  "nullable"
        INTEGER collection_duration_ms  "nullable"
        TEXT error_message  "nullable"
        DATETIME collected_at 
        DATETIME created_at 
    }
    hosts {
        VARCHAR id PK
        VARCHAR name 
        VARCHAR ip_address 
        VARCHAR status 
        VARCHAR ansible_group  "nullable"
        DATETIME last_seen  "nullable"
        BOOLEAN reachable 
        DATETIME created_at 
        DATETIME updated_at 
        DATETIME deleted_at  "nullable"
        BOOLEAN docker_enabled 
        VARCHAR docker_version  "nullable"
        VARCHAR docker_status  "nullable"
        DATETIME docker_last_collect_at  "nullable"
    }
    logs {
        INTEGER id PK
        VARCHAR level 
        VARCHAR source  "nullable"
        TEXT message 
        JSON details  "nullable"
        VARCHAR host_id  "nullable"
        VARCHAR task_id  "nullable"
        VARCHAR schedule_id  "nullable"
        DATETIME created_at 
    }
    playbook_lint_results {
        INTEGER id PK
        VARCHAR filename 
        INTEGER quality_score 
        INTEGER total_issues 
        INTEGER errors_count 
        INTEGER warnings_count 
        INTEGER execution_time_ms 
        TEXT issues_json  "nullable"
        TEXT raw_output  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
    }
    schedule_runs {
        INTEGER id PK
        VARCHAR schedule_id FK
        VARCHAR task_id FK "nullable"
        VARCHAR status 
        DATETIME started_at 
        DATETIME completed_at  "nullable"
        FLOAT duration  "nullable"
        INTEGER hosts_impacted  "nullable"
        TEXT error_message  "nullable"
        TEXT output  "nullable"
        DATETIME created_at 
    }
    schedules {
        VARCHAR id PK
        VARCHAR name 
        TEXT description  "nullable"
        VARCHAR playbook 
        VARCHAR target_type  "nullable"
        VARCHAR target 
        JSON extra_vars  "nullable"
        VARCHAR schedule_type 
        DATETIME schedule_time  "nullable"
        VARCHAR recurrence_type  "nullable"
        VARCHAR recurrence_time  "nullable"
        TEXT recurrence_days  "nullable"
        VARCHAR cron_expression  "nullable"
        VARCHAR timezone  "nullable"
        DATETIME start_at  "nullable"
        DATETIME end_at  "nullable"
        BOOLEAN enabled 
        TEXT tags  "nullable"
        DATETIME next_run  "nullable"
        DATETIME last_run  "nullable"
        VARCHAR last_status  "nullable"
        INTEGER retry_on_failure  "nullable"
        INTEGER timeout  "nullable"
        VARCHAR notification_type  "nullable"
        INTEGER run_count  "nullable"
        INTEGER success_count  "nullable"
        INTEGER failure_count  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
        DATETIME deleted_at  "nullable"
    }
    tasks {
        VARCHAR id PK
        VARCHAR action 
        VARCHAR target 
        VARCHAR status 
        VARCHAR playbook  "nullable"
        DATETIME started_at  "nullable"
        DATETIME completed_at  "nullable"
        TEXT error_message  "nullable"
        JSON result_data  "nullable"
        DATETIME created_at 
    }
    terminal_command_logs {
        INTEGER id PK
        DATETIME created_at 
        VARCHAR host_id FK
        INTEGER user_id FK "nullable"
        VARCHAR terminal_session_id  "nullable"
        TEXT command 
        VARCHAR command_hash 
        VARCHAR source 
        BOOLEAN is_pinned 
        BOOLEAN is_blocked 
        VARCHAR blocked_reason  "nullable"
        VARCHAR username  "nullable"
        VARCHAR host_name  "nullable"
    }
    terminal_sessions {
        VARCHAR id PK
        VARCHAR host_id 
        VARCHAR host_name 
        VARCHAR host_ip 
        INTEGER user_id  "nullable"
        VARCHAR username  "nullable"
        VARCHAR token_hash 
        INTEGER ttyd_port 
        INTEGER ttyd_pid  "nullable"
        VARCHAR mode 
        VARCHAR status 
        VARCHAR reason_closed  "nullable"
        DATETIME created_at 
        DATETIME last_seen_at 
        DATETIME expires_at 
        DATETIME closed_at  "nullable"
    }
    users {
        INTEGER id PK
        VARCHAR username 
        VARCHAR email  "nullable"
        VARCHAR hashed_password 
        VARCHAR role 
        BOOLEAN is_active 
        BOOLEAN is_superuser 
        VARCHAR display_name  "nullable"
        DATETIME created_at 
        DATETIME updated_at 
        DATETIME last_login  "nullable"
        DATETIME password_changed_at  "nullable"
        DATETIME deleted_at  "nullable"
    }
    users ||--o{ alerts : "user_id"
    hosts ||--o{ bootstrap_status : "host_id"
    users ||--o{ container_customizations : "user_id"
    hosts ||--o{ container_customizations : "host_id"
    hosts ||--o{ docker_alerts : "host_id"
    hosts ||--o{ docker_containers : "host_id"
    hosts ||--o{ docker_images : "host_id"
    hosts ||--o{ docker_volumes : "host_id"
    users ||--o{ favorite_containers : "user_id"
    docker_containers ||--o{ favorite_containers : "docker_container_id"
    favorite_groups ||--o{ favorite_containers : "group_id"
    users ||--o{ favorite_groups : "user_id"
    hosts ||--o{ host_metrics : "host_id"
    schedules ||--o{ schedule_runs : "schedule_id"
    tasks ||--o{ schedule_runs : "task_id"
    hosts ||--o{ terminal_command_logs : "host_id"
    users ||--o{ terminal_command_logs : "user_id"