artists(id, name, birth_date, birth_place)
pieces(id, type, creation_date)
pieces_data(piece_id, key, value)
piece_artist(piece_id, artist_id)
moves(piece_id, location_id, year, day)
collections(id, name, NULLABLE museum)
piece_collection(piece_id, collection_id)
exhibitions(id, begin, end, location_id)
piece_exhibition(piece_id, exhibition_id)
locations(id, city, street_name, street_number)
museums(id, location_id, name, opening_hours)
storages(id, location_id, size)