Run a contest without paying the prize twice
Snapshot the standings, pay from the snapshot, mark the contest closed — all in one transaction, with the entry rules decided before it opens.
Tagged “engagement”
5 entries
A daily task list that resets cleanly
Generate the day's tasks once, track progress against a date key, and pay the completion bonus exactly once — no midnight cron required.
Achievements that reward the behaviour you want
A table of conditions, a checker that runs after activity, and a unique key so an achievement can only be awarded once.
A leaderboard with a scheduled reset
Rank from a summary table rather than the raw ledger, snapshot the winners before you clear, and pay from the snapshot.
Fuel-gated accrual: make the miner need feeding
Production runs only while fuel lasts, and fuel comes from doing the thing you actually want done. Turns idle earning into a loop.