Add ProblemVariable table

prisma/migrations/20240301081925_create_problem_variable_table/migration.sql

@@ -0,0 +1,10 @@
+-- CreateTable
+CREATE TABLE "ProblemVariable" (
+    "id" INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    "userProblemSessionId" INTEGER NOT NULL,
+    "position" INTEGER NOT NULL,
+    "value" INTEGER NOT NULL,
+    CONSTRAINT "ProblemVariable_userProblemSessionId_fkey" FOREIGN KEY ("userProblemSessionId") REFERENCES "UserProblemSession" ("id") ON DELETE RESTRICT ON UPDATE CASCADE
+);

prisma/schema.prisma

@@ -30,9 +30,10 @@ model UserProblemSession {
   user      User     @relation(fields: [userId], references: [id])
   userId    String
 
-  courseId   String
-  programId  String
-  languageId String
+  courseId         String
+  programId        String
+  languageId       String
+  problemVariables ProblemVariable[]
 
   currentProblemType String
   currentStep        Int
@@ -42,6 +43,18 @@ model UserProblemSession {
   isCompleted        Boolean
 }
 
+model ProblemVariable {
+  id        Int      @id @default(autoincrement())
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  userProblemSession   UserProblemSession @relation(fields: [userProblemSessionId], references: [id])
+  userProblemSessionId Int
+
+  position Int
+  value    Int
+}
+
 model UserCompletedProblem {
   id        Int      @id @default(autoincrement())
   createdAt DateTime @default(now())