resolve compiler warnings

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Category.kt

@@ -32,7 +32,6 @@ object Category {
         if (name.equals(DEFAULT_CATEGORY_NAME, ignoreCase = true)) return
 
         transaction {
-            val count = CategoryTable.selectAll().count()
             if (CategoryTable.select { CategoryTable.name eq name }.firstOrNull() == null) {
                 CategoryTable.insert {
                     it[CategoryTable.name] = name

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/MangaList.kt

@@ -41,7 +41,7 @@ object MangaList {
         val mangasPage = this
         val mangaList = transaction {
             return@transaction mangasPage.mangas.map { manga ->
-                val mangaEntry = MangaTable.select { MangaTable.url eq manga.url }.firstOrNull()
+                var mangaEntry = MangaTable.select { MangaTable.url eq manga.url }.firstOrNull()
                 if (mangaEntry == null) { // create manga entry
                     val mangaId = MangaTable.insertAndGetId {
                         it[url] = manga.url
@@ -57,7 +57,7 @@ object MangaList {
                         it[sourceReference] = sourceId
                     }.value
 
-                    val mangaEntry = MangaTable.select { MangaTable.url eq manga.url }.first()
+                    mangaEntry = MangaTable.select { MangaTable.url eq manga.url }.first()
 
                     MangaDataClass(
                         mangaId,

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt

@@ -114,6 +114,7 @@ object ProtoBackupImport : ProtoBackupBase() {
         }
     }
 
+    @Suppress("UNUSED_PARAMETER") // TODO: remove
     private fun restoreMangaData(
         manga: Manga,
         chapters: List<Chapter>,