DROP TABLE IF EXISTS categories; -- is a list of categories(lists): type: reading_list, authors, notes, etc it's a type but type is also a keyword in python so better avoiding it
DROP TABLE IF EXISTS cards; --the single entry of any category/type


-- table creation
CREATE TABLE categories (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    title TEXT NOT NULL
);

CREATE TABLE cards (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    category_id INTEGER NOT NULL,
    created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    content TEXT NOT NULL,
    FOREIGN KEY (category_id) REFERENCES categories (id)
);