-- 039: producer job intake — a producer can ask for a NEW asset derived from an
-- existing one (burned-in lower thirds/logos/clock, an optional voiceover mix).
--
-- WHY COLUMNS AND NOT A NEW TABLE: video_processing_jobs (009) already models the
-- per-asset work queue (state machine, progress, output_key, RLS, tenant-immutability
-- triggers, workspace-scoped grants). Intake only needs to distinguish WHAT a queued
-- row asks the media-worker to do and carry the request payload; that is two columns
-- on the existing queue plus a nullable pointer to the row it produces. A second
-- table would duplicate the state machine and the isolation policy for no gain.
--
--   kind             'probe'  — the 009 behaviour: ingest + ffprobe + no-op transcode.
--                    'compose' — burn overlays (and optionally a logo PNG) over the source.
--                    'mix'     — compose AND replace/duck the audio bed with a voiceover.
--                    Default 'probe' keeps every existing row and INSERT (009 code path)
--                    meaning exactly what it meant before this migration.
--   input_json       the validated producer request ({...request, requestedBy}), only
--                    ever written by the API after strict allowlist parsing; the worker
--                    re-validates. NULL for probe rows.
--   produced_asset_id the video_assets row the job writes when it finishes, so a
--                    finished job points forward to its output.
--   video_assets.derived_from  the SOURCE asset id of a produced row; NULL for ingested
--                    uploads. Produced rows are ordinary video_assets rows, so they appear
--                    in the library listing and inherit its tenant isolation unchanged.
--
-- The kind enum is CHECK-constrained so an undecodable row cannot exist.

BEGIN;

ALTER TABLE video_processing_jobs
  ADD COLUMN kind text NOT NULL DEFAULT 'probe'
    CHECK (kind IN ('probe', 'compose', 'mix')),
  ADD COLUMN input_json jsonb,
  ADD COLUMN produced_asset_id uuid;

ALTER TABLE video_assets
  ADD COLUMN derived_from uuid REFERENCES video_assets(id);

-- Jobs that produce a derived asset are claimed by the media-worker by kind.
CREATE INDEX video_processing_jobs_kind_queued
  ON video_processing_jobs (kind, created_at DESC)
  WHERE state = 'queued';

COMMIT;