User ask: "a modal that lists the tracks downloaded via watchlist" — extended,
as discussed, to playlists too. One modal, two tabs, opened from the Watchlist
page (watchlist tab preselected) and the Sync page (playlists tab) — same
shared-modal-different-entry-points UX as the rest of the app.
The data: library_history recorded which SERVICE a file came from but never
what TRIGGERED it. New origin/origin_context columns (migration + index) are
written once at the import chokepoint via core/downloads/origin.py, a pure
tested deriver that reads, in priority: an explicit _dl_origin stamp (set at
batch-task creation for direct playlist batches, where the playlist context
otherwise only survived in folder mode), the wishlist provenance already
riding in track_info.source_info (watchlist_artist_name / playlist_name —
watchlist_scanner has stamped these for ages), and the folder-mode playlist
thread. Manual downloads stay unclassified by design. History starts from
now — provenance can't be conjured retroactively.
API: GET /api/download-origins?origin=watchlist|playlist (paged) and POST
/api/download-origins/delete — deletes the file on disk (resolved through the
shared container/host path resolver), the matching library track row, and the
history entries; a file that refuses deletion keeps its row and reports the
error instead of lying.
UI: webui/static/origin-history.js — tabbed modal in the revamp design
language (accent light-edge, pill tabs, entry rows reusing the
library-history-entry components), per-row delete + select-all bulk delete
with honest result toasts, empty/loading states, per-tab totals.
Tests: 8 — deriver priority/shapes (incl. the exact watchlist_scanner
source_info shape and JSON-string survival), origin filtering + counts,
row fetch/delete isolation between origins, delete-track-by-path.
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