I spent three months adding offline sync to ctrodb — a client-side database I'd been working on for about a year before that. The database itself was straightforward: schema validation, queries, a reactive signal system. Couple thousand lines. Nothing wild.
Sync was different.
It took more code than the rest of the database combined. I rewrote the conflict resolver three times. I shipped a transport system I later threw out. I learned what "eventually consistent" actually means when you're the one who has to implement it.
This is what I learned.
npm: npm install ctrodb
