Railway marks cron jobs as "failed" when the Node.js process doesn't
exit cleanly. The seed scripts relied on natural event loop drain,
but undici's connection pool keeps handles alive, causing Railway to
kill the process and mark it as failed.
Changes:
- Add process.exit(0) on success and lock-skip paths in runSeed()
- Fix recordCount for crypto (.quotes) and stablecoin (.stablecoins)
- Add writeExtraKey, sleep, parseYahooChart shared utilities
- Add extraKeys option to runSeed for bootstrap hydration keys
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