Another 3 hours troubleshooting and hopefully fixing MongoDB stability & performance issues: corrected Mongoose 6 driver options (top-level w:1/wtimeoutMS, tuned keepalive, removed useNewUrlParser), shipped URI-fixer v3 that preserves params and upserts directConnection/tls/appName, granted dbAdmin for Agenda auto-indexes, and added targeted indexes + pool tuning to eliminate ECONNRESET and slash query latency. #retently