leaderboard and ranked systems

prisma/migrations/20260507153558_init/migration.sql

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+-- CreateEnum
+CREATE TYPE "Subject" AS ENUM ('MATH', 'READING', 'WRITING');
+
+-- CreateEnum
+CREATE TYPE "Difficulty" AS ENUM ('EASY', 'MEDIUM', 'HARD');
+
+-- CreateEnum
+CREATE TYPE "SessionStatus" AS ENUM ('IN_PROGRESS', 'COMPLETED', 'ABANDONED');
+
+-- CreateTable
+CREATE TABLE "User" (
+    "id" TEXT NOT NULL,
+    "googleId" TEXT NOT NULL,
+    "email" TEXT NOT NULL,
+    "displayName" TEXT NOT NULL,
+    "avatarUrl" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "User_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "Question" (
+    "id" TEXT NOT NULL,
+    "grade" INTEGER NOT NULL,
+    "subject" "Subject" NOT NULL,
+    "strand" TEXT NOT NULL,
+    "difficulty" "Difficulty" NOT NULL,
+    "questionText" TEXT NOT NULL,
+    "options" JSONB NOT NULL,
+    "correctAnswer" TEXT NOT NULL,
+    "explanation" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "Question_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "GameSession" (
+    "id" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "grade" INTEGER NOT NULL,
+    "subject" "Subject" NOT NULL,
+    "status" "SessionStatus" NOT NULL DEFAULT 'IN_PROGRESS',
+    "score" INTEGER NOT NULL DEFAULT 0,
+    "totalQuestions" INTEGER NOT NULL,
+    "correctAnswers" INTEGER NOT NULL DEFAULT 0,
+    "startedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "completedAt" TIMESTAMP(3),
+
+    CONSTRAINT "GameSession_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "UserAnswer" (
+    "id" TEXT NOT NULL,
+    "sessionId" TEXT NOT NULL,
+    "questionId" TEXT NOT NULL,
+    "selectedAnswer" TEXT NOT NULL,
+    "isCorrect" BOOLEAN NOT NULL,
+    "timeSpentMs" INTEGER NOT NULL,
+    "answeredAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "UserAnswer_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "LeaderboardEntry" (
+    "id" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "grade" INTEGER NOT NULL,
+    "subject" "Subject" NOT NULL,
+    "bestScore" INTEGER NOT NULL,
+    "gamesPlayed" INTEGER NOT NULL,
+    "totalCorrect" INTEGER NOT NULL,
+    "rank" INTEGER,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "LeaderboardEntry_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_googleId_key" ON "User"("googleId");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_email_key" ON "User"("email");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "LeaderboardEntry_userId_grade_subject_key" ON "LeaderboardEntry"("userId", "grade", "subject");
+
+-- AddForeignKey
+ALTER TABLE "GameSession" ADD CONSTRAINT "GameSession_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "UserAnswer" ADD CONSTRAINT "UserAnswer_sessionId_fkey" FOREIGN KEY ("sessionId") REFERENCES "GameSession"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "UserAnswer" ADD CONSTRAINT "UserAnswer_questionId_fkey" FOREIGN KEY ("questionId") REFERENCES "Question"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "LeaderboardEntry" ADD CONSTRAINT "LeaderboardEntry_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/20260507153955_grade_enum/migration.sql

@@ -0,0 +1,25 @@
+/*
+  Warnings:
+
+  - Changed the type of `grade` on the `GameSession` table. No cast exists, the column would be dropped and recreated, which cannot be done if there is data, since the column is required.
+  - Changed the type of `grade` on the `LeaderboardEntry` table. No cast exists, the column would be dropped and recreated, which cannot be done if there is data, since the column is required.
+  - Changed the type of `grade` on the `Question` table. No cast exists, the column would be dropped and recreated, which cannot be done if there is data, since the column is required.
+
+*/
+-- CreateEnum
+CREATE TYPE "Grade" AS ENUM ('G3', 'G6', 'G9');
+
+-- AlterTable
+ALTER TABLE "GameSession" DROP COLUMN "grade",
+ADD COLUMN     "grade" "Grade" NOT NULL;
+
+-- AlterTable
+ALTER TABLE "LeaderboardEntry" DROP COLUMN "grade",
+ADD COLUMN     "grade" "Grade" NOT NULL;
+
+-- AlterTable
+ALTER TABLE "Question" DROP COLUMN "grade",
+ADD COLUMN     "grade" "Grade" NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "LeaderboardEntry_userId_grade_subject_key" ON "LeaderboardEntry"("userId", "grade", "subject");

prisma/migrations/20260511120000_add_leaderboard_score/migration.sql

@@ -0,0 +1,12 @@
+-- CreateTable
+CREATE TABLE "LeaderboardScore" (
+    "id" TEXT NOT NULL,
+    "playerName" TEXT NOT NULL,
+    "grade" "Grade" NOT NULL,
+    "score" INTEGER NOT NULL,
+    "totalQuestions" INTEGER NOT NULL,
+    "timeSeconds" INTEGER NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "LeaderboardScore_pkey" PRIMARY KEY ("id")
+);

prisma/migrations/20260525000000_add_username/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN "username" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_username_key" ON "User"("username");

prisma/migrations/20260525000001_rebuild_leaderboard_entry/migration.sql

@@ -0,0 +1,26 @@
+-- Drop stale table (old schema: subject, bestScore, rank — missing elo, bestTime)
+DROP TABLE IF EXISTS "LeaderboardEntry";
+
+-- Drop orphaned table from old migration
+DROP TABLE IF EXISTS "LeaderboardScore";
+
+-- Recreate with correct schema
+CREATE TABLE "LeaderboardEntry" (
+    "id" TEXT NOT NULL,
+    "userId" TEXT NOT NULL,
+    "grade" "Grade" NOT NULL,
+    "elo" INTEGER NOT NULL DEFAULT 1000,
+    "bestTime" INTEGER,
+    "gamesPlayed" INTEGER NOT NULL DEFAULT 0,
+    "totalCorrect" INTEGER NOT NULL DEFAULT 0,
+    "updatedAt" TIMESTAMP(3) NOT NULL DEFAULT NOW(),
+
+    CONSTRAINT "LeaderboardEntry_pkey" PRIMARY KEY ("id")
+);
+
+-- Unique per user+grade (no subject)
+CREATE UNIQUE INDEX "LeaderboardEntry_userId_grade_key" ON "LeaderboardEntry"("userId", "grade");
+
+-- Foreign key
+ALTER TABLE "LeaderboardEntry" ADD CONSTRAINT "LeaderboardEntry_userId_fkey"
+    FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

prisma/migrations/20260525000002_elo_default_800/migration.sql

@@ -0,0 +1 @@
+ALTER TABLE "LeaderboardEntry" ALTER COLUMN "elo" SET DEFAULT 800;

prisma/migrations/20260525164258_apply_pending/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "LeaderboardEntry" ALTER COLUMN "updatedAt" DROP DEFAULT;

prisma/migrations/migration_lock.toml

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+# Please do not edit this file manually
+# It should be added in your version-control system (i.e. Git)
+provider = "postgresql"