fix: botón Historial en clientes abre modal con historial completo de compras

pos/blueprints/customers_bp.py

@@ -140,6 +140,39 @@ def get_customer(customer_id):
     return jsonify(customer)
 
 
+@customers_bp.route('/<int:customer_id>/purchases', methods=['GET'])
+@require_auth('customers.view')
+def get_customer_purchases(customer_id):
+    """Return full purchase history for a customer."""
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    cur.execute("""
+        SELECT s.id, s.total, s.payment_method, s.sale_type, s.status, s.created_at,
+               e.name as employee_name
+        FROM sales s
+        LEFT JOIN employees e ON s.employee_id = e.id
+        WHERE s.customer_id = %s
+        ORDER BY s.created_at DESC
+    """, (customer_id,))
+
+    purchases = []
+    for r in cur.fetchall():
+        purchases.append({
+            'id': r[0],
+            'total': float(r[1]) if r[1] else 0,
+            'payment_method': r[2],
+            'sale_type': r[3],
+            'status': r[4],
+            'created_at': str(r[5]),
+            'employee_name': r[6],
+        })
+
+    cur.close()
+    conn.close()
+    return jsonify({'data': purchases})
+
+
 @customers_bp.route('', methods=['POST'])
 @require_auth('customers.create')
 def create_customer():