-- 0003_teams.sql — Team tier data layer (PRD §21 Phase 4).

CREATE TABLE teams (
    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name       TEXT NOT NULL,
    owner_id   UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    -- NULL = unlimited seats; otherwise the billed seat cap.
    seat_limit INTEGER,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_teams_owner ON teams(owner_id);

CREATE TABLE team_memberships (
    team_id    UUID NOT NULL REFERENCES teams(id) ON DELETE CASCADE,
    user_id    UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role       TEXT NOT NULL DEFAULT 'member'
                   CHECK (role IN ('owner', 'admin', 'member')),
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    PRIMARY KEY (team_id, user_id)
);

CREATE INDEX idx_team_memberships_user ON team_memberships(user_id);