CREATE TABLE "articles" (
  "id" bigserial,
  "title" varchar(50) NOT NULL,
  "content" text,
  "published" time,
  PRIMARY KEY ("id")
);

CREATE TABLE "comments" (
  "id" bigserial,
  "content" varchar(255) NOT NULL,
  "published" time,
  "u_id" int4,
  "a_id" int4 NOT NULL,
  PRIMARY KEY ("id")
);

CREATE TABLE "news" (
  "id" bigserial,
  "title" varchar(50) NOT NULL,
  "content" text,
  "published" time,
  "related" uuid,
  PRIMARY KEY ("id")
);

CREATE TABLE "users" (
  "id" bigserial,
  "name" varchar(50) NOT NULL,
  "profile" varchar(255) NOT NULL DEFAULT https://www.merlin.xin/public/profile,
  "account" varchar(255) NOT NULL,
  "password" varchar(255) NOT NULL,
  PRIMARY KEY ("id")
);

ALTER TABLE "articles" ADD CONSTRAINT "fk_articles_comments_1" FOREIGN KEY ("id") REFERENCES "comments" ("a_id");
ALTER TABLE "users" ADD CONSTRAINT "fk_users_comments_1" FOREIGN KEY ("id") REFERENCES "comments" ("u_id");