-- written for Postgres 9.6 with OSSP extension for UUIDs

CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- uuid_generate_v1mc: timestamp ordered, random MAC address
-- uuid_generate_v4:   totally random

-- NB: could use LIKE clause, or "composite types"

CREATE TABLE editor (
    id                  UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    username            TEXT NOT NULL,
    is_admin            BOOLEAN NOT NULL DEFAULT false,
    active_editgroup_id BIGINT, -- REFERENCES(editgroup.id) via ALTER below
)

CREATE TABLE editgroup (
    id                  BIGSERIAL PRIMARY KEY,
    extra_json          JSON,
    editor_id           BIGINT REFERENCES(editor.id) NOT NULL,
    description         TEXT,
)

ALTER TABLE editor ADD CONSTRAINT editor_eg_id FOREIGN KEY (editgroup.id)

CREATE TABLE changelog (
    id                  BIGSERIAL PRIMARY KEY,
    editgroup_id        BIGINT REFERENCES(editgroup.id) NOT NULL,
    timestamp           TIMESTAMP WITHOUT TIME ZONE DEFAULT now,
)

CREATE TABLE creator_rev (
    id                  BIGSERIAL PRIMARY KEY,
    extra_json          JSON,

    name                TEXT,
    orcid               TEXT,
)

-- Could denormalize a "is_live" flag into revision tables, to make indices
-- more efficient
CREATE INDEX creator_rev_orcid_idx ON creator_rev(orcid) WHERE orcid IS NOT NULL;

CREATE TABLE creator_ident (
    id                  UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    is_live             BOOL NOT NULL,
    rev_id              BIGINT REFERENCES(creator_rev.id),
    redirect_id         BIGINT REFERENCES(id),
)

CREATE TABLE creator_edit (
    id                  BIGSERIAL PRIMARY KEY,
    extra_json          JSON,
    ident_id            BIGINT REFERENCES(creator_ident.id) NOT NULL,
    rev_id              BIGINT REFERENCES(creator_rev.id),
    redirect_id         BIGINT REFERENCES(creator_ident.id),
    editgroup_id        BIGINT REFERENCES(editgroup.id) NOT NULL,
)