# `StatifierOban.Timer.DedupKey`
[🔗](https://github.com/riddler/statifier_oban/blob/v0.17.3/lib/statifier_oban/timer/dedup_key.ex#L1)

`{session scope, ordinal}` - the compact dedup key ADR-0059 decision 3
blesses, read off the stored `%Statifier.Effect.SendDelayed{}`.

ADR-0059 amended ADR-0054 decision 3: `%SendDelayed{}` and `%Cancel{}`
carry a per-execution `ordinal` minted from a session-global, monotone
counter, so `{session scope, ordinal}` is unique on its own. This package
stores that pair as the key; the remaining components of the documented
compound form - `send_id`, `macrostep`, `microstep`, `round`, `c_index`,
`owner` - stay row data on the stored effect rather than key components.
Both forms are conformant; the compound form remains upstream's documented
default because it is self-describing in a store, and this package keeps
that self-description by storing the effect itself alongside the key.

Both components are deterministic as of scheduling rather than firing:
the ordinal is pure fold state (ADR-0059 decision 2), so re-executing the
same drive after a crash rebuilds a byte-identical key. Cancellation never
addresses this key - spec 6.3 cancels every timer under a sendid, and
`send_id` is row data here, so a cancel matches rows via
`StatifierOban.Timer.Key.cancels?/3`.

# `t`

```elixir
@type t() :: %StatifierOban.Timer.DedupKey{ordinal: pos_integer(), scope: String.t()}
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*