-- Threaded page comments (issue #91).

CREATE TABLE "comments" (
    "id" TEXT NOT NULL,
    "page_id" TEXT NOT NULL,
    "parent_id" TEXT,
    "author_id" TEXT,
    "body" TEXT NOT NULL,
    "anchor" TEXT,
    "resolved_at" TIMESTAMP(3),
    "resolved_by" TEXT,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "edited_at" TIMESTAMP(3),

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

CREATE INDEX "comments_page_id_created_at_idx" ON "comments"("page_id", "created_at");
CREATE INDEX "comments_parent_id_idx" ON "comments"("parent_id");

ALTER TABLE "comments" ADD CONSTRAINT "comments_page_id_fkey"
    FOREIGN KEY ("page_id") REFERENCES "pages"("id") ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE "comments" ADD CONSTRAINT "comments_parent_id_fkey"
    FOREIGN KEY ("parent_id") REFERENCES "comments"("id") ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE "comments" ADD CONSTRAINT "comments_author_id_fkey"
    FOREIGN KEY ("author_id") REFERENCES "users"("id") ON DELETE SET NULL ON UPDATE CASCADE;