The IEF->CBU0 UCITS remap (515117d, 2026-07-16 12:28) left the paper account
holding IDTM (the old thin Dist line, bought on the 07-15/16 09:00 runs under the
prior IEF->IDTM config). The rebalancer only ever traded its TARGET symbols
(_plan iterates targets.items()), so it never sold the orphaned IDTM — it lingered
in the account NLV and (correctly) tripped the stray-holdings warning.
Fix — scoped, safe self-cleaning:
- superseded_holdings(): the symbols multistrat ITSELF previously traded (per its
own exec_fills) that are still held but no longer a target — priced at the last
fill. Scoped to multistrat's own fills, so a position ANOTHER strategy holds on
the SHARED IBKR account is never touched.
- plan_and_record: adds them at target weight 0 (+ LSEETF/USD spec so a UCITS line
resolves by symbol to SELL) before the rebalance. Best-effort: a scan failure
never blocks a real rebalance.
- _plan: a full EXIT (weight 0 on a held line) ALWAYS trades — hysteresis damps
churn, it must not strand a position we're deliberately closing.
Next UCITS rebalance (09:00) closes IDTM and buys CBU0; the warning clears. Also
prevents future mapping-change legacy from silently accreting in the NLV.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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