Query optimisations for last_messages and traffic

app/Models/Echoarea.php

@@ -6,16 +6,18 @@ use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\SoftDeletes;
-use Illuminate\Support\Facades\Cache;
+use Rennokki\QueryCache\Traits\QueryCacheable;
 
 use App\Traits\ScopeActive;
 
 class Echoarea extends Model
 {
-	use SoftDeletes,ScopeActive;
+	use SoftDeletes,ScopeActive,QueryCacheable;
 
 	private const CACHE_TIME = 3600;
 
+	protected $dates = [ 'last_message' ];
+
 	/* RELATIONS */
 
 	public function addresses()
@@ -34,31 +36,30 @@ class Echoarea extends Model
 			->orderBy('datetime','ASC');
 	}
 
-	/* ATTRIBUTES */
-
-	public function getLastMessageAttribute(): ?Carbon
-	{
-		return $this->echomail?->last()->datetime;
-	}
-
 	/* METHODS */
 
 	public function messages_count(int $period): int
 	{
-		$key = sprintf('%s_%d_%d','echo_messages_count',$this->id,$period);
+		$eo = Echomail::cacheFor(self::CACHE_TIME)
+			->where('echoarea_id',$this->id);
 
-		return Cache::remember($key,self::CACHE_TIME,function() use ($period) {
-			switch ($period) {
-				case 1: // day
-					return $this->echomail()->where('datetime','>=',Carbon::now()->startOfday()->subDay())->count();
-				case 7: // week
-					return $this->echomail()->where('datetime','>=',Carbon::now()->startOfday()->subWeek())->count();
-				case 30: // month
-					return $this->echomail()->where('datetime','>=',Carbon::now()->startOfday()->subMonth())->count();
-				default:
-					return 0;
-			}
-		});
+		$dt = Carbon::now()->startOfday();
+
+		switch ($period) {
+			case 1: // day
+				$eo->where('datetime','>=',$dt->subDay());
+				break;
+			case 7: // week
+				$eo->where('datetime','>=',$dt->subWeek());
+				break;
+			case 30: // month
+				$eo->where('datetime','>=',$dt->subMonth());
+				break;
+			default:
+				return 0;
+		}
+
+		return $eo->count();
 	}
 
 	/**