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`POST /matches/result` granted coins, XP, level-ups, statistics, four objective metrics, loan expiry, season progression and achievements across a dozen SEPARATE writes with no transaction and no idempotency key. Every call re-credited the same match, and any mid-way failure half-applied it. It sat beside `/matches/complete`, so nothing stopped one match being paid twice through two different doors. It cannot be made exactly-once in place: that needs a caller-supplied match identity, and this request shape has none. Deriving one from the body would collapse two legitimate matches with the same scoreline into one — the under-credit trap already documented for the `fp:` fallback. So the route fails closed: it rejects with a message naming `/matches/complete`, rather than 404, so a caller learns why. The behaviour it uniquely drove is kept, not deleted. `process_match` was the ONLY caller of loan expiry and Core's season model, so both move into `complete_match`'s transaction behind opt-in `expire_loans` / `advance_season` flags. Both default OFF, which keeps the FIFA 17 retail path byte-identical: FIFA 17 has its own loan and Seasons models, and Core's season END GRANTS coins and a pack — invisible economy on a path that never asked for it. Their pooled implementations are replaced by `expire_loans_tx` and `season::record_match_tx`, so a loan that expires or a season that ends commits with the match that caused it. Notifications (level-up / objective / loan / season) were pooled side effects of the removed path. They now emit from the route AFTER the commit — never inside the transaction, since a failed notification must not roll back a completed match — and only when `applied`, so a replay no longer re-notifies. The pooled path had no replay concept and notified every time. Also fixes a real bug this surfaced: `/auth/reset` never deleted `match_completions`, which carries un-cascaded foreign keys to BOTH `matches` and `profiles`. Any profile that completed a match through the authoritative route — i.e. every FIFA 17 profile after a retail match — failed to reset with a database error. It is now deleted first, and ordering is documented. Tests: the 20 integration call sites move to the authoritative route through one helper that mints a per-call identity (each call IS a distinct match). New coverage for the closed path: it rejects without moving the balance or writing history; Core progression stays off unless opted into; a replay does not duplicate notifications; and a profile that completed matches can still be reset.