-- Peer invitations (issue #332): a user invites an e-mail address; the token
-- allows exactly one registration even while registration is closed.

-- CreateTable
CREATE TABLE "invitations" (
    "id" TEXT NOT NULL,
    "inviter_id" TEXT NOT NULL,
    "email" TEXT NOT NULL,
    "token_hash" TEXT NOT NULL,
    "expires_at" TIMESTAMP(3) NOT NULL,
    "revoked_at" TIMESTAMP(3),
    "accepted_at" TIMESTAMP(3),
    "accepted_user_id" TEXT,
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateIndex
CREATE UNIQUE INDEX "invitations_token_hash_key" ON "invitations"("token_hash");

-- CreateIndex
CREATE INDEX "invitations_inviter_id_idx" ON "invitations"("inviter_id");

-- AddForeignKey
ALTER TABLE "invitations" ADD CONSTRAINT "invitations_inviter_id_fkey" FOREIGN KEY ("inviter_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;