-- In-app notifications (issue #94); mailed_at prepares the #95 digests.

CREATE TABLE "notifications" (
    "id" TEXT NOT NULL,
    "user_id" TEXT NOT NULL,
    "type" TEXT NOT NULL,
    "payload" JSONB NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "read_at" TIMESTAMP(3),
    "mailed_at" TIMESTAMP(3),

    CONSTRAINT "notifications_pkey" PRIMARY KEY ("id")
);

CREATE INDEX "notifications_user_id_read_at_created_at_idx"
    ON "notifications"("user_id", "read_at", "created_at");

ALTER TABLE "notifications" ADD CONSTRAINT "notifications_user_id_fkey"
    FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;