text: /* Storing encrypted messages */
  CREATE TABLE "messages"
  (
      "id"    SERIAL NOT NULL,
      "date" TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP NOT NULL,
      "message"   text NOT NULL,
      "message_thread" int not null constraint "FK_message_thread" references message,
      "author"    varchar(24) not null constraint "FK_author" references agents("username"),
   CONSTRAINT "PK_messages" PRIMARY KEY ( "id" )
  );
  CREATE INDEX "fkIdx_message_thread" ON "messages"
  (
   "message_thread"
  );
  CREATE INDEX "fkIdx_author" ON "messages"
  (
   "author"
  );