CREATE TABLE IF NOT EXISTS sheets (id INTEGER PRIMARY KEY AUTOINCREMENT,
       last_opened INTEGER, name TEXT, composer_id INTEGER, first_page INTEGER, book_id INTEGER, path TEXT, file_size INTEGER, file_hash TEXT);
CREATE TABLE IF NOT EXISTS orphans (id INTEGER PRIMARY KEY AUTOINCREMENT,
       last_opened INTEGER, path TEXT, file_size INTEGER, file_hash TEXT);
CREATE TABLE IF NOT EXISTS books (id INTEGER PRIMARY KEY AUTOINCREMENT,
       last_opened INTEGER, name TEXT, composer_id INTEGER, sheet_ids TEXT, path TEXT, file_size INTEGER, file_hash TEXT);

CREATE TABLE IF NOT EXISTS composers (id INTEGER primary key autoincrement, name TEXT);