-- DROP TABLE IF EXISTS public.reference CASCADE;
CREATE TABLE public.reference (
    id                  BIGSERIAL PRIMARY KEY,
    user_id             BIGINT NOT NULL REFERENCES public.user(id),
    uri                 TEXT NOT NULL UNIQUE,
    created_ts          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_ts          TIMESTAMPTZ NOT NULL DEFAULT NOW()
);
CREATE INDEX idx__public__reference__user_id        ON public.reference (user_id);
CREATE INDEX idx__public__reference__created_ts     ON public.reference (created_ts);
CREATE INDEX idx__public__reference__updated_ts     ON public.reference (updated_ts);

-- DROP TABLE IF EXISTS public.agreement_reference CASCADE;
CREATE TABLE public.agreement_reference (
    id                  BIGSERIAL PRIMARY KEY,
    user_id             BIGINT NOT NULL REFERENCES public.user(id),
    agreement_id        BIGINT NOT NULL REFERENCES public.agreement(id),
    reference_id        BIGINT NOT NULL REFERENCES public.reference(id),
    created_ts          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_ts          TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT uniq__agreement_reference_id UNIQUE (user_id, agreement_id, reference_id)
);
CREATE INDEX idx__public__agreement_reference__user_id        ON public.agreement_reference (user_id);
CREATE INDEX idx__public__agreement_reference__agreement_id   ON public.agreement_reference (agreement_id);
CREATE INDEX idx__public__agreement_reference__reference_id   ON public.agreement_reference (reference_id);
CREATE INDEX idx__public__agreement_reference__created_ts     ON public.agreement_reference (created_ts);
CREATE INDEX idx__public__agreement_reference__updated_ts     ON public.agreement_reference (updated_ts);

ALTER TABLE public.agreement ALTER COLUMN parent DROP NOT NULL;