Initial Ladill Care release.

Healthcare management app: patients, appointments, consultations, lab,
pharmacy inventory, billing, and reports at care.ladill.com.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Drug.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models;
+
+use App\Models\Concerns\BelongsToOwner;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class Drug extends Model
+{
+    use BelongsToOwner, SoftDeletes;
+
+    protected $table = 'care_drugs';
+
+    protected $fillable = [
+        'owner_ref', 'organization_id', 'branch_id', 'name', 'generic_name',
+        'sku', 'unit', 'unit_price_minor', 'reorder_level', 'is_active',
+    ];
+
+    protected function casts(): array
+    {
+        return ['is_active' => 'boolean'];
+    }
+
+    public function organization(): BelongsTo
+    {
+        return $this->belongsTo(Organization::class, 'organization_id');
+    }
+
+    public function branch(): BelongsTo
+    {
+        return $this->belongsTo(Branch::class, 'branch_id');
+    }
+
+    public function batches(): HasMany
+    {
+        return $this->hasMany(DrugBatch::class, 'drug_id');
+    }
+
+    public function stockOnHand(): int
+    {
+        return (int) $this->batches()->sum('quantity_on_hand');
+    }
+}