diff --git a/app/src/main/java/com/github/braillesystems/learnbraille/data/db/LearnBrailleDatabase.kt b/app/src/main/java/com/github/braillesystems/learnbraille/data/db/LearnBrailleDatabase.kt
index 75329794..90896701 100644
--- a/app/src/main/java/com/github/braillesystems/learnbraille/data/db/LearnBrailleDatabase.kt
+++ b/app/src/main/java/com/github/braillesystems/learnbraille/data/db/LearnBrailleDatabase.kt
@@ -31,7 +31,7 @@ import timber.log.Timber
         CurrentStep::class, LastCourseStep::class, LastLessonStep::class,
         Action::class
     ],
-    version = 19,
+    version = 20,
     exportSchema = true
 )
 @TypeConverters(
@@ -134,7 +134,8 @@ abstract class LearnBrailleDatabase : RoomDatabase(), KoinComponent {
             .addMigrations(
                 MIGRATION_16_17,
                 MIGRATION_17_18,
-                MIGRATION_18_19
+                MIGRATION_18_19,
+                MIGRATION_19_20
             )
             .build()
             .init()
@@ -209,119 +210,132 @@ private val MIGRATION_17_18 = object : Migration(17, 18) {
     }
 }
 
-private val MIGRATION_18_19 = object : Migration(18, 19) {
-    override fun migrate(database: SupportSQLiteDatabase) {
-        Timber.i("Start 18-19 migration")
-
-        database.execSQL("delete from lessons")
-        database.execSQL("delete from steps")
-        database.execSQL("delete from decks")
-        database.execSQL("delete from cards")
-        database.execSQL("delete from materials")
-        database.execSQL("delete from step_has_annotations")
-        database.execSQL("delete from step_annotations")
-
-        Timber.i("Old data removed")
-
-        prepopulationData.run {
-            lessons?.forEach {
-                database.insert(
-                    "lessons",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("id", id)
-                            put("course_id", courseId)
-                            put("name", name)
-                            put("description", description)
-                        }
+fun updateTheoryAndMaterials(database: SupportSQLiteDatabase) {
+    database.execSQL("delete from lessons")
+    database.execSQL("delete from steps")
+    database.execSQL("delete from decks")
+    database.execSQL("delete from cards")
+    database.execSQL("delete from materials")
+    database.execSQL("delete from step_has_annotations")
+    database.execSQL("delete from step_annotations")
+
+    Timber.i("Old data removed")
+
+    prepopulationData.run {
+        lessons?.forEach {
+            database.insert(
+                "lessons",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("id", id)
+                        put("course_id", courseId)
+                        put("name", name)
+                        put("description", description)
                     }
-                )
-            }
+                }
+            )
+        }
 
-            steps?.forEach {
-                database.insert(
-                    "steps",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("id", id)
-                            put("course_id", courseId)
-                            put("lesson_id", lessonId)
-                            put("data", StepDataConverters().to(data))
-                        }
+        steps?.forEach {
+            database.insert(
+                "steps",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("id", id)
+                        put("course_id", courseId)
+                        put("lesson_id", lessonId)
+                        put("data", StepDataConverters().to(data))
                     }
-                )
-            }
+                }
+            )
+        }
 
-            decks?.forEach {
-                database.insert(
-                    "decks",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("id", id)
-                            put("tag", tag)
-                        }
+        decks?.forEach {
+            database.insert(
+                "decks",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("id", id)
+                        put("tag", tag)
                     }
-                )
-            }
+                }
+            )
+        }
 
-            cards?.forEach {
-                database.insert(
-                    "cards",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("deck_id", deckId)
-                            put("material_id", materialId)
-                        }
+        cards?.forEach {
+            database.insert(
+                "cards",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("deck_id", deckId)
+                        put("material_id", materialId)
                     }
-                )
-            }
+                }
+            )
+        }
 
-            materials?.forEach {
-                database.insert(
-                    "materials",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("id", id)
-                            put("data", MaterialDataTypeConverters().to(data))
-                        }
+        materials?.forEach {
+            database.insert(
+                "materials",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("id", id)
+                        put("data", MaterialDataTypeConverters().to(data))
                     }
-                )
-            }
+                }
+            )
+        }
 
-            stepAnnotations?.forEach {
-                database.insert(
-                    "step_annotations",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("id", id)
-                            put("name", name)
-                        }
+        stepAnnotations?.forEach {
+            database.insert(
+                "step_annotations",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("id", id)
+                        put("name", name)
                     }
-                )
-            }
+                }
+            )
+        }
 
-            stepsHasAnnotations?.forEach {
-                database.insert(
-                    "step_has_annotations",
-                    SQLiteDatabase.CONFLICT_ABORT,
-                    it.run {
-                        ContentValues().apply {
-                            put("course_id", courseId)
-                            put("lesson_id", lessonId)
-                            put("step_id", stepId)
-                            put("annotation_id", annotationId)
-                        }
+        stepsHasAnnotations?.forEach {
+            database.insert(
+                "step_has_annotations",
+                SQLiteDatabase.CONFLICT_ABORT,
+                it.run {
+                    ContentValues().apply {
+                        put("course_id", courseId)
+                        put("lesson_id", lessonId)
+                        put("step_id", stepId)
+                        put("annotation_id", annotationId)
                     }
-                )
-            }
+                }
+            )
         }
+    }
+
+    Timber.i("New data inserted")
+}
 
+private val MIGRATION_18_19 = object : Migration(18, 19) {
+    override fun migrate(database: SupportSQLiteDatabase) {
+        Timber.i("Start 18-19 migration")
+        updateTheoryAndMaterials(database)
         Timber.i("Finish 18-19 migration")
     }
 }
+
+private val MIGRATION_19_20 = object : Migration(19, 20) {
+    override fun migrate(database: SupportSQLiteDatabase) {
+        Timber.i("Start 19-20 migration")
+        updateTheoryAndMaterials(database)
+        Timber.i("Finish 19-20 migration")
+    }
+}
+
diff --git a/detekt-config.yml b/detekt-config.yml
index 3cb39ad2..86265a83 100644
--- a/detekt-config.yml
+++ b/detekt-config.yml
@@ -6,7 +6,7 @@ complexity:
   LongMethod:
     excludes: ['**/*Fragment.kt', '**/*Application.kt', '**/LearnBrailleDatabase.kt']
   ComplexMethod:
-    excludes: ['**/*Fragment.kt']
+    excludes: ['**/*Fragment.kt', '**/LearnBrailleDatabase.kt']
   LongParameterList:
     excludes: ['**/*Repository.kt']  # Dependency injection