initial

app/Models/ApprovalWorkflow.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ApprovalWorkflow extends Model
+{
+    /** @use HasFactory<\Database\Factories\ApprovalWorkflowFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'description',
+        'is_active',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+        ];
+    }
+
+    public function steps(): HasMany
+    {
+        return $this->hasMany(ApprovalStep::class, 'workflow_id')->orderBy('order');
+    }
+
+    public function travelRequests(): HasMany
+    {
+        return $this->hasMany(TravelRequest::class, 'workflow_id');
+    }
+}