diff --git a/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModels.kt b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModels.kt
index 1599a8d..cd4a613 100644
--- a/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModels.kt
+++ b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModels.kt
@@ -205,6 +205,7 @@ class OsuApiModels {
     data class Beatmap(
         val beatmapset_id: Int,
         val difficulty_rating: Double?,
+        val checksum: String?,
         val id: Int,
         val version: String?,
         val beatmapset: BeatmapSet,
@@ -222,6 +223,7 @@ class OsuApiModels {
 
     @Serializable
     data class BeatmapSet(
+        val id: Int,
         val artist: String?,
         val creator: String?,
         val source: String?,
diff --git a/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModelsExtensions.kt b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModelsExtensions.kt
new file mode 100644
index 0000000..de0e9af
--- /dev/null
+++ b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApiModelsExtensions.kt
@@ -0,0 +1,28 @@
+package com.nisemoe.nise.osu
+
+fun OsuApiModels.Beatmap.toScoreBeatmap(): OsuApiModels.ScoreBeatmap =
+    OsuApiModels.ScoreBeatmap(
+        id = this.id,
+        checksum = this.checksum,
+        difficulty_rating = this.difficulty_rating,
+        version = this.version,
+        max_combo = this.max_combo,
+        total_length = this.total_length,
+        bpm = this.bpm,
+        accuracy = this.accuracy,
+        ar = this.ar,
+        cs = this.cs,
+        drain = this.drain,
+        count_circles = this.count_circles,
+        count_sliders = this.count_sliders,
+        count_spinners = this.count_spinners,
+    )
+
+fun OsuApiModels.BeatmapSet.toScoreBeatmapSet(): OsuApiModels.ScoreBeatmapset =
+    OsuApiModels.ScoreBeatmapset(
+        id = this.id,
+        title = this.title,
+        artist = this.artist,
+        creator = this.creator,
+        source = this.source,
+    )
\ No newline at end of file