Fix duplicated history (#182)

back/prisma/migrations/20230405061222_/migration.sql

@@ -0,0 +1,16 @@
+/*
+  Warnings:
+
+  - The primary key for the `LessonHistory` table will be changed. If it partially fails, the table could be left without primary key constraint.
+  - The primary key for the `SongHistory` table will be changed. If it partially fails, the table could be left without primary key constraint.
+
+*/
+-- AlterTable
+ALTER TABLE "LessonHistory" DROP CONSTRAINT "LessonHistory_pkey",
+ADD COLUMN     "id" SERIAL NOT NULL,
+ADD CONSTRAINT "LessonHistory_pkey" PRIMARY KEY ("id");
+
+-- AlterTable
+ALTER TABLE "SongHistory" DROP CONSTRAINT "SongHistory_pkey",
+ADD COLUMN     "id" SERIAL NOT NULL,
+ADD CONSTRAINT "SongHistory_pkey" PRIMARY KEY ("id");

back/prisma/schema.prisma

@@ -45,14 +45,13 @@ model Song {
 }
 
 model SongHistory {
+    id           Int  @id @default(autoincrement())
     song         Song @relation(fields: [songID], references: [id], onDelete: Cascade, onUpdate: Cascade)
     songID       Int
     user         User @relation(fields: [userID], references: [id], onDelete: Cascade, onUpdate: Cascade)
     userID       Int
     score        Int
     difficulties Json
-
-    @@id([songID, userID])
 }
 
 model Genre {
@@ -88,12 +87,11 @@ model Lesson {
 }
 
 model LessonHistory {
+    id       Int    @id @default(autoincrement())
     lesson   Lesson @relation(fields: [lessonID], references: [id])
     lessonID Int
     user     User   @relation(fields: [userID], references: [id])
     userID   Int
-
-    @@id([lessonID, userID])
 }
 
 enum Skill {