-- Spectator predictions and tournament pick'ems.
CREATE TABLE IF NOT EXISTS prediction (
	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
	user_id text NOT NULL,
	match_id uuid REFERENCES match(id) ON DELETE CASCADE,
	tournament_match_id uuid REFERENCES tournament_match(id) ON DELETE CASCADE,
	winner_team_id uuid NOT NULL REFERENCES team(id) ON DELETE CASCADE,
	winner_score integer,
	loser_score integer,
	points integer,
	created_at timestamptz NOT NULL DEFAULT now(),
	updated_at timestamptz NOT NULL DEFAULT now(),
	CONSTRAINT prediction_one_subject CHECK ((match_id IS NULL) <> (tournament_match_id IS NULL))
);
CREATE UNIQUE INDEX IF NOT EXISTS idx_prediction_user_match ON prediction (user_id, match_id);
CREATE UNIQUE INDEX IF NOT EXISTS idx_prediction_user_tmatch ON prediction (user_id, tournament_match_id);
CREATE INDEX IF NOT EXISTS idx_prediction_match ON prediction (match_id);
CREATE INDEX IF NOT EXISTS idx_prediction_tmatch ON prediction (tournament_match_id);