Added production characteristics model file

app/Models/ProductionCharacteristic.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class ProductionCharacteristic extends Model
+{
+    use SoftDeletes;
+
+    protected $fillable = [
+        'plant_id',
+        'line_id',
+        'item_id',
+        'machine_id',
+        'production_order',
+        'serial_number',
+        'observed_value',
+        'characteristic_name',
+        'status',
+        'inspection_status',
+        'remark',
+        'created_at',
+        'updated_at',
+        'created_by',
+        'updated_by',
+    ];
+
+    public function plant(): BelongsTo
+    {
+        return $this->belongsTo(Plant::class);
+    }
+
+    public function line(): BelongsTo
+    {
+        return $this->belongsTo(Line::class);
+    }
+
+    public function item(): BelongsTo
+    {
+        return $this->belongsTo(Item::class);
+    }
+
+    public function machine(): BelongsTo
+    {
+        return $this->belongsTo(Machine::class);
+    }
+}