Add SMS bulk delay configuration and validate coupon phone function

app/Models/SmsSendLog.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\SmsSendStatus;
+use Database\Factories\SmsSendLogFactory;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class SmsSendLog extends Model
+{
+    /** @use HasFactory<SmsSendLogFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'sms_campaign_id',
+        'coupon_id',
+        'phone',
+        'message',
+        'status',
+        'error_message',
+        'attempted_at',
+    ];
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'status' => SmsSendStatus::class,
+            'attempted_at' => 'datetime',
+        ];
+    }
+
+    public function campaign(): BelongsTo
+    {
+        return $this->belongsTo(SmsCampaign::class, 'sms_campaign_id');
+    }
+
+    public function coupon(): BelongsTo
+    {
+        return $this->belongsTo(Coupon::class);
+    }
+}