-- Historique des transcripts générés (conservés par utilisateur/vidéo/langue).
CREATE TABLE IF NOT EXISTS transcript_history (
  id TEXT PRIMARY KEY,
  user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  provider TEXT NOT NULL,
  video_id TEXT NOT NULL,
  title TEXT,
  thumbnail TEXT,
  lang TEXT NOT NULL,
  languages_json TEXT,
  lines_json TEXT NOT NULL DEFAULT '[]',
  line_count INTEGER NOT NULL DEFAULT 0,
  char_count INTEGER NOT NULL DEFAULT 0,
  created_at TEXT NOT NULL,
  updated_at TEXT NOT NULL
);
CREATE UNIQUE INDEX IF NOT EXISTS uq_transcript_history_user_video_lang
  ON transcript_history(user_id, provider, video_id, lang);
CREATE INDEX IF NOT EXISTS idx_transcript_history_user_time
  ON transcript_history(user_id, updated_at DESC);
CREATE INDEX IF NOT EXISTS idx_transcript_history_user_provider
  ON transcript_history(user_id, provider);