-- Watches + auto-watch preferences (issue #93).

ALTER TABLE "users" ADD COLUMN "auto_watch_own_pages" BOOLEAN NOT NULL DEFAULT true;
ALTER TABLE "users" ADD COLUMN "auto_watch_on_comment" BOOLEAN NOT NULL DEFAULT true;

CREATE TYPE "WatchTargetType" AS ENUM ('PAGE', 'POND');

CREATE TABLE "watches" (
    "id" TEXT NOT NULL,
    "user_id" TEXT NOT NULL,
    "target_type" "WatchTargetType" NOT NULL,
    "target_id" TEXT NOT NULL,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

CREATE UNIQUE INDEX "watches_user_id_target_type_target_id_key"
    ON "watches"("user_id", "target_type", "target_id");
CREATE INDEX "watches_target_type_target_id_idx" ON "watches"("target_type", "target_id");

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