diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/models/DataRemoveModel.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/models/DataRemoveModel.kt
index 2f9c8fd9..49b57999 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/models/DataRemoveModel.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/models/DataRemoveModel.kt
@@ -38,12 +38,12 @@ open class DataRemoveModel {
 
         fun commit(profileId: Int, dao: GradeDao) {
             if (all) {
-                if (type != null) dao.clearWithType(profileId, type)
+                if (type != null) dao.dontKeepWithType(profileId, type)
                 else dao.clear(profileId)
             }
             semester?.let {
-                if (type != null) dao.clearForSemesterWithType(profileId, it, type)
-                else dao.clearForSemester(profileId, it)
+                if (type != null) dao.dontKeepForSemesterWithType(profileId, it, type)
+                else dao.dontKeepForSemester(profileId, it)
             }
         }
     }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/dao/GradeDao.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/dao/GradeDao.kt
index 5862859e..4fcfc721 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/dao/GradeDao.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/dao/GradeDao.kt
@@ -82,14 +82,14 @@ abstract class GradeDao : BaseDao<Grade, GradeFull> {
     fun getByIdNow(profileId: Int, id: Long) =
             getOneNow("$QUERY WHERE grades.profileId = $profileId AND gradeId = $id")
 
-    @Query("DELETE FROM grades WHERE profileId = :profileId AND gradeType = :type")
-    abstract fun clearWithType(profileId: Int, type: Int)
+    @Query("UPDATE grades SET keep = 0 WHERE profileId = :profileId AND gradeType = :type")
+    abstract fun dontKeepWithType(profileId: Int, type: Int)
 
-    @Query("DELETE FROM grades WHERE profileId = :profileId AND gradeSemester = :semester")
-    abstract fun clearForSemester(profileId: Int, semester: Int)
+    @Query("UPDATE grades SET keep = 0 WHERE profileId = :profileId AND gradeSemester = :semester")
+    abstract fun dontKeepForSemester(profileId: Int, semester: Int)
 
-    @Query("DELETE FROM grades WHERE profileId = :profileId AND gradeSemester = :semester AND gradeType = :type")
-    abstract fun clearForSemesterWithType(profileId: Int, semester: Int, type: Int)
+    @Query("UPDATE grades SET keep = 0 WHERE profileId = :profileId AND gradeSemester = :semester AND gradeType = :type")
+    abstract fun dontKeepForSemesterWithType(profileId: Int, semester: Int, type: Int)