add set scheduling api

backend/app/Schedule/ScheduleModel.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Schedule;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property int $id
+ * @property int $user_id
+ * @property int $set_id
+ * @property string $element_kind
+ * @property string $start_date
+ * @property string $target_date
+ *
+ * @method static Builder<static>|ScheduleModel newModelQuery()
+ * @method static Builder<static>|ScheduleModel newQuery()
+ * @method static Builder<static>|ScheduleModel query()
+ *
+ * @mixin \Eloquent
+ */
+#[Fillable([
+    'user_id',
+    'set_id',
+    'element_kind',
+    'start_date',
+    'target_date',
+])]
+class ScheduleModel extends Model
+{
+    protected $table = 'schedules';
+
+    public $timestamps = false;
+
+    /**
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'user_id' => 'integer',
+            'set_id' => 'integer',
+        ];
+    }
+}