<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

/**
 * Current state only, one row per entity (pure upserts — stays small and fast).
 */
class DeviceState extends Model
{
    protected $fillable = ['entity_id', 'state', 'observed_at'];

    protected $casts = ['state' => 'array', 'observed_at' => 'integer'];

    public function entity(): BelongsTo
    {
        return $this->belongsTo(Entity::class);
    }
}