CREATE TABLE IF NOT EXISTS team_invitations (
    id BIGSERIAL PRIMARY KEY,
    team_member_id BIGINT NOT NULL REFERENCES team_members(id) ON DELETE CASCADE,
    token VARCHAR(128) NOT NULL UNIQUE,
    status VARCHAR(20) NOT NULL DEFAULT 'pending' CHECK (
        status IN ('pending', 'accepted', 'expired', 'revoked')
    ),
    expires_at TIMESTAMPTZ NOT NULL,
    invited_by BIGINT,
    accepted_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_team_invitations_token ON team_invitations(token);
CREATE INDEX IF NOT EXISTS idx_team_invitations_team_member_id ON team_invitations(team_member_id);
CREATE INDEX IF NOT EXISTS idx_team_invitations_status ON team_invitations(status);
CREATE INDEX IF NOT EXISTS idx_team_invitations_expires_at ON team_invitations(expires_at);