ALTER TABLE songs ADD COLUMN key_signature TEXT NOT NULL DEFAULT '';
-- vamp-statement
CREATE TABLE practice_exercises (
  id TEXT PRIMARY KEY NOT NULL CHECK(length(trim(id)) BETWEEN 1 AND 120),
  title TEXT NOT NULL CHECK(length(trim(title)) BETWEEN 1 AND 200),
  composer TEXT NOT NULL DEFAULT '',
  key_signature TEXT NOT NULL DEFAULT 'C',
  source_json TEXT NOT NULL CHECK(json_valid(source_json)),
  source_path TEXT NOT NULL DEFAULT '',
  created_at_ms INTEGER NOT NULL CHECK(created_at_ms >= 0),
  updated_at_ms INTEGER NOT NULL CHECK(updated_at_ms >= created_at_ms)
) STRICT;
-- vamp-statement
CREATE INDEX idx_practice_exercises_title ON practice_exercises(title);