chore: initial commit of existing codebase

app/Models/PurchaseSignature.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class PurchaseSignature extends Model
+{
+    protected $fillable = [
+        'purchase_request_id', 'signed_by', 'signature_image', 'signed_at', 'ip_address',
+    ];
+
+    protected $casts = ['signed_at' => 'datetime'];
+
+    public function purchaseRequest()
+    {
+        return $this->belongsTo(PurchaseRequest::class);
+    }
+
+    public function signedBy()
+    {
+        return $this->belongsTo(User::class, 'signed_by');
+    }
+}