CREATE TABLE IF NOT EXISTS issues (
    id BIGSERIAL PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    start_time TIMESTAMPTZ NOT NULL,
    end_time TIMESTAMPTZ NOT NULL,
    created TIMESTAMPTZ NOT NULL DEFAULT now(),
    version INT NOT NULL DEFAULT 1
);

CREATE TABLE IF NOT EXISTS options (
    id BIGSERIAL PRIMARY KEY,
    issue_id BIGINT NOT NULL REFERENCES issues(id) ON DELETE CASCADE,
    label VARCHAR(255) NOT NULL,
    created TIMESTAMPTZ NOT NULL DEFAULT now(),
    version INT NOT NULL DEFAULT 1
);

CREATE TABLE IF NOT EXISTS vote_tokens (
    id BIGSERIAL PRIMARY KEY,
    issue_id BIGINT NOT NULL REFERENCES issues(id) ON DELETE CASCADE,
    token UUID NOT NULL UNIQUE DEFAULT gen_random_uuid(),
    used BOOLEAN NOT NULL DEFAULT FALSE,
    created TIMESTAMPTZ NOT NULL DEFAULT now(),
    version INT NOT NULL DEFAULT 1
);

CREATE TABLE IF NOT EXISTS votes (
    id BIGINT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    token UUID NOT NULL UNIQUE REFERENCES vote_tokens(token) ON DELETE CASCADE,
    option_id BIGINT NOT NULL REFERENCES options(id) ON DELETE CASCADE,
    created TIMESTAMPTZ NOT NULL DEFAULT now(),
    version INT NOT NULL DEFAULT 1
);

CREATE INDEX idx_votes_option_id ON votes(option_id);
CREATE INDEX idx_vote_tokens_issue_id ON vote_tokens(issue_id);
CREATE INDEX idx_options_issue_id ON options(issue_id);