refactor: rewrite problem page (#143)

prisma/migrations/20240925092027_refine_problem_session/migration.sql

@@ -0,0 +1,22 @@
+-- DropTable
+PRAGMA foreign_keys=off;
+DROP TABLE "ProblemSession";
+PRAGMA foreign_keys=on;
+
+-- CreateTable
+CREATE TABLE "ProblemSession" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    "userId" TEXT NOT NULL,
+    "courseId" TEXT NOT NULL,
+    "lectureId" TEXT NOT NULL,
+    "problemId" TEXT NOT NULL,
+    "problemVariablesSeed" TEXT NOT NULL,
+    "problemType" TEXT NOT NULL,
+    "traceItemIndex" INTEGER NOT NULL,
+    "elapsedMilliseconds" INTEGER NOT NULL DEFAULT 0,
+    "completedAt" DATETIME,
+    CONSTRAINT "ProblemSession_userId_fkey" FOREIGN KEY ("userId") REFERENCES "User" ("id") ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE INDEX "ProblemSession_userId_courseId_lectureId_problemId_completedAt_idx" ON "ProblemSession"("userId", "courseId", "lectureId", "problemId", "completedAt");

prisma/schema.prisma

@@ -33,10 +33,9 @@ model ProblemSession {
   lectureId String
   problemId String
 
-  problemVariablesSeed   String
-  currentProblemType     String
-  currentTraceItemIndex  Int
-  previousTraceItemIndex Int
+  problemVariablesSeed String
+  problemType          String
+  traceItemIndex       Int
 
   elapsedMilliseconds Int       @default(0)
   completedAt         DateTime?