优化

docs/superpowers/plans/2026-09-24-segment-coverage.md

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+# Segment Coverage Implementation Plan
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** IntroDB prewarm + same-season intro propagation + shorter miss TTL + playback-only duration probe (option C).
+
+**Architecture:** Extend `MediaSegmentService` for merge/propagate/prewarm; add scheduler job `segment_prewarm`; repository queries for candidates and season siblings.
+
+**Tech Stack:** Go, GORM/SQLite, existing SchedulerService + IntroDB client.
+
+---
+
+### Task 1: Negative cache TTL + ledgerFresh tests
+
+**Files:** `internal/service/media_segment.go`, `internal/service/media_segment_test.go`
+
+- Change `segmentMissingTTL` to 24h; update tests for fresh/stale miss.
+
+### Task 2: Playback merge + propagation
+
+**Files:** `media_segment.go`, `media_segment_repository.go`, `media_repository.go`, tests
+
+- Constant `PropagatedSource = "propagated"`.
+- `ListForPlayback` merges sources with priority manual > theintrodb > propagated.
+- After successful IntroDB refresh with intro, propagate to same-season siblings (shared `tm_db_id` or `series_id`).
+
+### Task 3: Prewarm API + scheduler job
+
+**Files:** `media_segment.go`, `media_segment_repository.go`, `scheduler.go`, `scheduler_segment_jobs.go`, `service_builder.go`, tests
+
+- `Prewarm(ctx, limit)` rate-limited refreshes.
+- Job `segment_prewarm` every 6h.
+
+### Task 4: Verify
+
+- `go test` for affected packages.

docs/superpowers/specs/2026-09-24-segment-coverage-design.md

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+# Segment Coverage Improvements (1–4, option C)
+
+## Goal
+
+Raise intro/outro skip availability without Chromaprint or full-library STRM probing.
+
+## Scope (approved)
+
+1. **IntroDB prewarm** — background job for all queryable media (TMDb + season/episode).
+2. **Duration** — playback-path only (no full STRM scan); keep `ListForPlayback` → `EnsureAsync`.
+3. **Same-season intro propagation** — copy intro to sibling episodes after a hit.
+4. **Negative cache** — miss TTL 24h; 403/429/timeout must not write miss ledger.
+
+## Non-goals
+
+Chromaprint, manual segment UI, library-name filters, batch STRM duration scan.
+
+## Behavior
+
+### Prewarm (`segment_prewarm`)
+
+- Scheduler job, interval 6h, initial delay 6h (avoid restart spike).
+- **Opt-in via `segment.prewarm_enabled` (default off)** — system settings toggle「后台预热 IntroDB 片头片段」.
+- Candidates: `tm_db_id > 0`, season/episode or movie, ledger missing or stale.
+- Order: recently played first, then others.
+- Rate: ~1 req/s, stop on context cancel; respect IntroDB 429 retry already in client.
+- Reuse `MediaSegmentService` refresh + propagation.
+- Manual `RunNow` can bypass the toggle (same pattern as organize).
+
+### Propagation
+
+- After TheIntroDB refresh finds at least one `intro` span, write the same intro window to same-season siblings that lack a `theintrodb` intro.
+- Source tag: `propagated`.
+- Do not propagate credits/preview/recap.
+- Playback merge priority per kind: `manual` > `theintrodb` > `propagated`.
+
+### Negative cache
+
+- `segmentMissingTTL`: 24h (was 7d).
+- `segmentFoundTTL`: 30d (unchanged).
+- Provider errors (non-404) continue to skip ledger writes.
+
+### Duration (C)
+
+- No new batch probe job.
+- Existing `defer ensureMediaProbe` on playback remains the only STRM duration path.
+
+## Success criteria
+
+- Prewarm increases `media_segment_fetches` over time without blocking play.
+- One IntroDB intro hit can surface skip on sibling episodes via `propagated`.
+- Misses are retried within ~24h (sooner if recently played and prewarm runs).