From what you describe, I probably would have charged them a tad more and taken a tad longer to deliver. However they would receive a production-ready application, that properly filters and sanitises and normalizes input, that is robust and resilient and reasonably extensible, and has a logical database format.

Tell me, does this vibe coded app running this business properly handle monetary addition, such as in invoicing or summarizing or deciding how big a check to write to the tax man? Are you sure? No floating point math hiding intermittent bugs?