chore: initial commit of existing codebase

app/Models/ProductionCost.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ProductionCost extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['production_order_id', 'raw_material_cost', 'labor_cost', 'machine_cost', 'overhead_cost', 'total_cost', 'notes'];
+
+    protected $casts = [
+        'raw_material_cost' => 'decimal:2',
+        'labor_cost' => 'decimal:2',
+        'machine_cost' => 'decimal:2',
+        'overhead_cost' => 'decimal:2',
+        'total_cost' => 'decimal:2',
+    ];
+
+    public function productionOrder()
+    {
+        return $this->belongsTo(ProductionOrder::class);
+    }
+}