-- LandingPage (singleton-style id)
CREATE TABLE "LandingPage" (
    "id" TEXT NOT NULL,
    "content" JSONB NOT NULL,
    "updatedAt" TIMESTAMP(3) NOT NULL,

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

-- Certificate
CREATE TABLE "Certificate" (
    "id" TEXT NOT NULL,
    "code" TEXT NOT NULL,
    "userId" TEXT NOT NULL,
    "courseId" TEXT NOT NULL,
    "issuedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,

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

CREATE UNIQUE INDEX "Certificate_code_key" ON "Certificate"("code");

CREATE UNIQUE INDEX "Certificate_userId_courseId_key" ON "Certificate"("userId", "courseId");

ALTER TABLE "Certificate" ADD CONSTRAINT "Certificate_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;

ALTER TABLE "Certificate" ADD CONSTRAINT "Certificate_courseId_fkey" FOREIGN KEY ("courseId") REFERENCES "Course"("id") ON DELETE CASCADE ON UPDATE CASCADE;