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A job that runs every minute kept getting heavier.
Orbit has a treasury lab: a Base Sepolia testnet experiment that only moves valueless test USDC. A worker checks the wallet every minute. Earlier this month the project's Disk IO budget started draining.
The cause: each run saved the whole wallet state as one JSON value. That state gained a reconciliation on nearly every scan and never dropped one. So every minute the database rewrote a bigger document than the minute before, and every transfer row was rewritten too, even when nothing had changed.
The fix:
→ The wallet row keeps only the newest 20 reconciliations (the screen shows 10). Every one is still kept in an append-only table.
→ Unchanged transfer rows are no longer rewritten.
→ Treasury pages stop polling while their tab is in the background.
→ A daily cleanup keeps one week of cron run history instead of all of it (that job alone adds 1,440 rows a day).
The lesson I keep relearning: anything that runs on a timer needs a ceiling. If a payload only ever grows, the bill grows with it.
What's the sneakiest background cost you've found in your own projects?
I take on PRDs, AI-built MVPs and UX audits. DM me.
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