---
key: sched.auto-tune-foundation
title: 2026-07-16 — Auto-tuning enumerates via EF, persists via SmartCollection; additive coexistence (#69)
status: active
since: '2026-07-16'
supersedes: none
superseded-by: none
rule: Auto-tune preview enumeration uses EF distinct+count queries for exact counts, while each created channel is persisted as a live SmartCollection; coexistence with existing channels/numbers is additive-only, never mutating.
signals: 'auto-tuning, SmartCollection, additive coexistence, channel numbering · paths: `CreateChannelFromLineup` · issues: #69, #63'
mechanics: '`PreviewAutoTuneChannelsHandler`, `AutoTuneAxisMap`, `ISender`-based `CreateChannelFromLineup` primitive'
---

Auto-tuning (#69) generates channels from library metadata (TV Show / TV Genre / Movie Genre).
Enumeration for the preview uses EF distinct+count queries (exact counts drive the min-items
threshold and preview display); each created channel is backed by a newly-created **SmartCollection**
(live Lucene query) so channels keep tracking the library as it grows. Query authorship is
server-side only — the client passes `{axis, value}`, never a Lucene string. Coexistence is additive:
the batch gets a reserved starting channel number (skipping taken numbers), a proposed channel whose
name already exists is flagged and de-selected by default, and existing channels are never mutated.
Bulk create loops the #63 `CreateChannelFromLineup` primitive via `ISender` and returns a per-channel
Created/Skipped/Failed outcome. Known MVP limitation: the generated SmartCollection is named after the
channel; a name collision with an existing SmartCollection surfaces as a per-channel Failed outcome.