Occupancy / Capacity Counter
A concurrency-safe, append-only manual headcount ledger — lock-safe in/out events, zero-clamped, that warns then flags when a configurable capacity is exceeded. Counts people without identifying them.
Why This Exists
A manual headcount counter that stays correct under concurrent staff clicking in/out. Each change is an append-only event applied under a database row lock and clamped at zero, so two simultaneous updates can never corrupt the count; a configurable capacity warns as you approach it and flags when you exceed it. It records how many people are present, never who — there is no headcount PII.
Features
Concurrency-Safe
Row-locked in/out mutations, clamped at zero
Append-Only Ledger
Every change is an event you can walk and audit
Warn-Then-Flag
Configurable capacity with a warn threshold then a flag
No Headcount PII
Counts how many, never who
What You Get
How It Works
Set a Capacity
Configure the zone capacity and a warn threshold.
Count In / Out
Staff tap in or out; each tap is a row-locked, zero-clamped event.
Warn Then Flag
As the count approaches capacity it warns; when it exceeds, it flags — you decide what that means in your app.
Audit
Walk the append-only ledger any time to see exactly how the count moved.
Technical Details
In/out mutations run inside a transaction under a zone-row lockForUpdate and clamp at zero. The guarantee holds on Postgres / MySQL / MariaDB (sqlite serializes).
Append-only events (who acted, delta, timestamp) — the count is derived and auditable.
A local no-op provider by default; the owner/tenant columns bind to your model via a documented seam and are not cross-tenant mass-assignable.
It is a record/audit ledger — it does NOT sense presence and does NOT ensure fire-code or legal-capacity compliance. It counts what staff enter.
Frequently Asked Questions
Occupancy / Capacity Counter
A concurrency-safe, append-only manual headcount ledger — lock-safe in/out events, zero-clamped, that warns then flags when a configurable capacity is exceeded. Counts people without identifying them.
A live preview running the real package. The product itself is downloadable source you self-host on your own site.
This product isn't available for purchase yet.
Item Details
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