add foreign keys and extend models

device-app/app/Models/OwnerTransaction.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Device;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class OwnerTransaction extends Model
+{
+    use HasFactory;
+
+    /**
+     * The primary key associated with the devices table.
+     * @var string
+     */
+    protected $primaryKey = 'owner_transaction_id';
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array<int, string>
+     */
+    protected $fillable = ['owner_transaction_id', 'rz_username', 'timestamp_owner_since', 'device_id'];
+
+    public function device() {
+        return $this->belongsTo(Device::class, 'device_id');
+    }
+
+}