-- CreateTable
CREATE TABLE "AccountLinkRequest" (
    "id" TEXT NOT NULL,
    "fromUserId" TEXT NOT NULL,
    "toUserId" TEXT NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateTable
CREATE TABLE "AccountLink" (
    "id" TEXT NOT NULL,
    "userId" TEXT NOT NULL,
    "linkedUserId" TEXT NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- A link is between two *different* accounts; the app layer also refuses
-- self-links before ever reaching this constraint.
ALTER TABLE "AccountLink" ADD CONSTRAINT "account_link_not_self" CHECK ("userId" <> "linkedUserId");

-- CreateTable
CREATE TABLE "AccountLinkBlock" (
    "id" TEXT NOT NULL,
    "fromUserId" TEXT NOT NULL,
    "toUserId" TEXT NOT NULL,
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateTable
CREATE TABLE "AccountSwitchToken" (
    "id" TEXT NOT NULL,
    "token" TEXT NOT NULL,
    "requestedBy" TEXT NOT NULL,
    "targetUserId" TEXT NOT NULL,
    "expiresAt" TIMESTAMP(3) NOT NULL,
    "usedAt" TIMESTAMP(3),
    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

-- CreateIndex
CREATE UNIQUE INDEX "AccountLinkRequest_fromUserId_toUserId_unique" ON "AccountLinkRequest"("fromUserId", "toUserId");

-- CreateIndex
CREATE INDEX "AccountLinkRequest_toUserId_idx" ON "AccountLinkRequest"("toUserId");

-- CreateIndex
CREATE UNIQUE INDEX "AccountLink_userId_linkedUserId_unique" ON "AccountLink"("userId", "linkedUserId");

-- CreateIndex
CREATE UNIQUE INDEX "AccountLinkBlock_fromUserId_toUserId_unique" ON "AccountLinkBlock"("fromUserId", "toUserId");

-- CreateIndex
CREATE UNIQUE INDEX "AccountSwitchToken_token_key" ON "AccountSwitchToken"("token");

-- AddForeignKey
ALTER TABLE "AccountLinkRequest" ADD CONSTRAINT "AccountLinkRequest_fromUserId_fkey" FOREIGN KEY ("fromUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountLinkRequest" ADD CONSTRAINT "AccountLinkRequest_toUserId_fkey" FOREIGN KEY ("toUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountLink" ADD CONSTRAINT "AccountLink_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountLink" ADD CONSTRAINT "AccountLink_linkedUserId_fkey" FOREIGN KEY ("linkedUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountLinkBlock" ADD CONSTRAINT "AccountLinkBlock_fromUserId_fkey" FOREIGN KEY ("fromUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountLinkBlock" ADD CONSTRAINT "AccountLinkBlock_toUserId_fkey" FOREIGN KEY ("toUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountSwitchToken" ADD CONSTRAINT "AccountSwitchToken_requestedBy_fkey" FOREIGN KEY ("requestedBy") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "AccountSwitchToken" ADD CONSTRAINT "AccountSwitchToken_targetUserId_fkey" FOREIGN KEY ("targetUserId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;