fix: cascade delete related transactions and ledgers for sales and expenses

Ensure data integrity by cleaning up dependent records when deleting Sale or Expense models. This prevents orphaned transactions and ledgers in the database.

app/Models/Expense.php

@@ -25,6 +25,20 @@ class Expense extends Model
         return $this->morphMany(Transaction::class, 'transactionable');
     }
 
+    protected static function booted()
+    {
+        static::deleting(function ($expense) {
+            $expense->transactions->each(function ($transaction) {
+                // Delete associated ledgers first to trigger any ledger deletion logic if exists
+                $transaction->ledgers->each(function ($ledger) {
+                    $ledger->balances()->delete(); // Delete balances associated with ledger
+                    $ledger->delete();
+                });
+                $transaction->delete();
+            });
+        });
+    }
+
     public function branch(): BelongsTo
     {
         return $this->belongsTo(Branch::class);