chore: update document approval workflow and bug fixes

Modules/ContractorManagement/app/Models/ContractorEquipment.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Modules\ContractorManagement\Models;
+
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Modules\ContractorManagement\Enums\EquipmentStatus;
+
+class ContractorEquipment extends Model
+{
+    use HasPublicIdentifier;
+
+    protected $table = 'contractor_equipment';
+
+    protected $fillable = [
+        'contractor_id', 'name', 'type', 'serial_number',
+        'status', 'daily_rate', 'last_maintenance_date',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => EquipmentStatus::class,
+            'daily_rate' => 'decimal:2',
+            'last_maintenance_date' => 'date',
+        ];
+    }
+
+    public function contractor(): BelongsTo
+    {
+        return $this->belongsTo(Contractor::class);
+    }
+
+    public function deployments(): HasMany
+    {
+        return $this->hasMany(EquipmentDeployment::class, 'contractor_equipment_id');
+    }
+
+    public function activeDeployment(): ?EquipmentDeployment
+    {
+        return $this->deployments()->whereNull('returned_date')->first();
+    }
+}