text: CREATE TABLE letters (
    id UUID NOT NULL PRIMARY KEY,
    message_id VARCHAR(256) NOT NULL,
    service VARCHAR(256) NOT NULL,
    is_failed BOOLEAN DEFAULT FALSE,
    created_at TIMESTAMP NOT NULL,
    sent_to_print_at TIMESTAMP NULL,
    printed_at TIMESTAMP NULL,
    type VARCHAR(256) NOT NULL,
    additional_data JSON NULL,
    status VARCHAR(256),
    file_content BYTEA,
    is_encrypted BOOLEAN DEFAULT FALSE
  );
  