Add SongAlbumMap

app/src/main/kotlin/it/vfsfitvnm/vimusic/models/SongAlbumMap.kt

@@ -0,0 +1,31 @@
+package it.vfsfitvnm.vimusic.models
+
+import androidx.compose.runtime.Immutable
+import androidx.room.ColumnInfo
+import androidx.room.Entity
+import androidx.room.ForeignKey
+
+
+@Immutable
+@Entity(
+    primaryKeys = ["songId", "albumId"],
+    foreignKeys = [
+        ForeignKey(
+            entity = Song::class,
+            parentColumns = ["id"],
+            childColumns = ["songId"],
+            onDelete = ForeignKey.CASCADE
+        ),
+        ForeignKey(
+            entity = Album::class,
+            parentColumns = ["id"],
+            childColumns = ["albumId"],
+            onDelete = ForeignKey.CASCADE
+        )
+    ]
+)
+data class SongAlbumMap(
+    @ColumnInfo(index = true) val songId: String,
+    @ColumnInfo(index = true) val albumId: String,
+    val position: Int?
+)