Same, I maintain a really healthy mountaineering app (6K users), I started it where we where still pasting into chat-gpt, and now fully autonomous with Claude Code.
Codebase has never been better and healthier, and any tech debt that has been accumulated after a few releases can be removed in a few prompts when you are out of product ideas and have some free tokens to spare.
(I added US mountains and trails btw: https://fescims.com )