Miguel Palhas
29c31beceb
DESIGN.md §15 as amended: a language is satisfied by exactly one sidecar, and no filename segment distinguishes forced from plain from SDH. A unique index over sidecar rows says so; embedded rows keep their own key, since several tracks for one language can legitimately coexist inside a video. Existing databases may hold a duplicate from a manual grab that beat the API's path check, so the migration resolves them rather than failing: a real subtitle beats a machine translation, and of two of the same kind the newest wins. The files stay on disk for the manual delete to clean up. `record_file` no longer swallows every conflict — only the two that mean "arr already knows this file".
42 lines
1.8 KiB
SQL
42 lines
1.8 KiB
SQL
-- #222. DESIGN.md §15, as amended: a language is satisfied by exactly one
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-- sidecar. No filename segment distinguishes forced from plain from SDH, so
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-- two sidecar rows for one (media file, language) describe two files
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-- competing for one name. The schema says so now rather than leaving it to
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-- the API's path check.
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--
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-- Embedded rows are deliberately untouched. They describe tracks inside the
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-- video, not files on disk, and several can legitimately coexist for one
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-- language — a plain track and a forced one, say. Their key stays
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-- `(media_file_id, language, forced, sdh)`.
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-- A database that predates the constraint may already hold a duplicate from
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-- a manual grab that beat the path check: a fetched `.pt-PT.srt` beside a
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-- translated `.pt-PT.mt.srt`, for instance. Resolve rather than fail. Of the
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-- rows for one (media file, language): keep a real subtitle over a machine
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-- translation, and of two of the same kind the newest.
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--
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-- The files stay on disk. Deleting a viewer's subtitle during a migration is
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-- worse than leaving an orphan, and the manual delete (#218, #223) cleans one
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-- up on request.
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DELETE FROM subtitle_files
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WHERE path IS NOT NULL
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AND id NOT IN (
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SELECT id
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FROM (
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SELECT id,
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ROW_NUMBER() OVER (
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PARTITION BY media_file_id, language
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ORDER BY (origin = 'translated') ASC,
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created_at DESC,
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id DESC
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) AS place
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FROM subtitle_files
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WHERE path IS NOT NULL
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)
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WHERE place = 1
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);
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CREATE UNIQUE INDEX subtitle_files_one_sidecar
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ON subtitle_files (media_file_id, language)
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WHERE path IS NOT NULL;
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