async def create(conn):
    # Households table
    await conn.execute(
        """
        CREATE TABLE IF NOT EXISTS Household (
            id INTEGER PRIMARY KEY,
            name TEXT NOT NULL,
            slug TEXT NOT NULL UNIQUE
        );
        """
    )

    # Membership table
    await conn.execute(
        """
        CREATE TABLE IF NOT EXISTS HouseholdMember (
            user_id INTEGER NOT NULL,
            household_id INTEGER NOT NULL,
            role TEXT NOT NULL,
            PRIMARY KEY (user_id, household_id),
            FOREIGN KEY(user_id) REFERENCES User(id) ON DELETE CASCADE,
            FOREIGN KEY(household_id) REFERENCES Household(id) ON DELETE CASCADE
        );
        """
    )

    # Invitations table
    await conn.execute(
        """
        CREATE TABLE IF NOT EXISTS HouseholdInvitation (
            id INTEGER PRIMARY KEY,
            household_id INTEGER NOT NULL,
            email TEXT NOT NULL,
            invited_by_user_id INTEGER NOT NULL,
            token TEXT NOT NULL UNIQUE,
            expires_at DATETIME NOT NULL,
            status TEXT NOT NULL,
            FOREIGN KEY(household_id) REFERENCES Household(id) ON DELETE CASCADE,
            FOREIGN KEY(invited_by_user_id) REFERENCES User(id) ON DELETE SET NULL
        );
        """
    )

    # Indices
    await conn.execute("CREATE INDEX IF NOT EXISTS idx_household_slug ON Household(slug);")
    await conn.execute(
        "CREATE INDEX IF NOT EXISTS idx_household_member_household ON HouseholdMember(household_id);"
    )