-- AlterEnum
ALTER TYPE "ChatChannelType" ADD VALUE 'GRUPPE';

-- AlterTable
ALTER TABLE "ChatChannel" ADD COLUMN     "createdByUserId" TEXT,
ADD COLUMN     "name" TEXT;

-- AlterTable
ALTER TABLE "ChatParticipant" ADD COLUMN     "guestAccountId" TEXT,
ALTER COLUMN "userId" DROP NOT NULL;

-- CreateIndex
CREATE UNIQUE INDEX "ChatParticipant_channelId_guestAccountId_key" ON "ChatParticipant"("channelId", "guestAccountId");

-- AddForeignKey
ALTER TABLE "ChatParticipant" ADD CONSTRAINT "ChatParticipant_guestAccountId_fkey" FOREIGN KEY ("guestAccountId") REFERENCES "GuestAccount"("id") ON DELETE CASCADE ON UPDATE CASCADE;