CREATE TABLE IF NOT EXISTS lessons (
  id TEXT PRIMARY KEY,
  source_run_ids TEXT NOT NULL,
  source_review_ids TEXT NOT NULL,
  kind TEXT NOT NULL,
  title TEXT NOT NULL,
  content_path TEXT NOT NULL,
  status TEXT NOT NULL,
  decided_by TEXT,
  decided_at TEXT,
  rationale TEXT,
  target_ref TEXT,
  CHECK (status IN ('proposed', 'reviewing', 'promoted', 'rejected')),
  CHECK (json_array_length(source_run_ids) >= 1),
  CHECK (json_array_length(source_review_ids) >= 1)
);