Thank you for the detailed response - much appreciated. You have tempted me to look into Flynn further. The headline feature that attracts me is HA postgresql

Thank you for the detailed response - much appreciated. You have tempted me to look into Flynn further. The headline feature that attracts me is HA postgresql - that has instant relevance. My greatest concern is stability - I'm not seeing many success stories but lots of problems. I want to hear that Flynn is "the one bit of my stack I don't have to worry about". I hope you can publish some case-studies (both successes and post-mortems) including discussion of the attempted architectures. A fundamental philosophical worry I have is that it is a "wrapper tech". I increasingly stay away from these - the promise is that they make the underlying tech easier/quicker to use but they make assumptions that don't hold for you in the long-term, they serve too many unrelated use cases so become bloated and poorly fitted to your own needs and they reduce the features, flexibility and stability of the tech they wrap. The cost in fixing & working-around the wrapper can quickly exceed the cost/value of building your own glue based on the underlying tech because it also gives you a greater depth of knowledge in the fundamentals and more power.