diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
index ff101fd0..e6d7e40e 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/AppDb.kt
@@ -43,7 +43,7 @@ import pl.szczodrzynski.edziennik.data.db.migration.*
     LibrusLesson::class,
     TimetableManual::class,
     Metadata::class
-], version = 90)
+], version = 91)
 @TypeConverters(
         ConverterTime::class,
         ConverterDate::class,
@@ -175,7 +175,8 @@ abstract class AppDb : RoomDatabase() {
                 Migration87(),
                 Migration88(),
                 Migration89(),
-                Migration90()
+                Migration90(),
+                Migration91()
         ).allowMainThreadQueries().build()
     }
 }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration91.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration91.kt
new file mode 100644
index 00000000..ffb8b093
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/db/migration/Migration91.kt
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2021-2-26.
+ */
+
+package pl.szczodrzynski.edziennik.data.db.migration
+
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
+
+class Migration91 : Migration(90, 91) {
+    override fun migrate(database: SupportSQLiteDatabase) {
+        // get all profiles using Vulcan/Hebe
+        database.execSQL("CREATE TABLE _91_ids (id INTEGER NOT NULL);")
+        database.execSQL("INSERT INTO _91_ids SELECT profileId FROM profiles JOIN loginStores USING(loginStoreId) WHERE loginStores.loginStoreType = 1;")
+
+        // force attendance sync - mobidziennik
+        // after enabling counting the e-attendance to statistics
+        database.execSQL("DELETE FROM endpointTimers WHERE profileId IN (SELECT id FROM _91_ids) AND endpointId = 2050;")
+        database.execSQL("UPDATE attendances SET attendanceIsCounted = 1 WHERE profileId IN (SELECT id FROM _91_ids);")
+        database.execSQL("UPDATE attendances SET attendanceBaseType = 2 WHERE profileId IN (SELECT id FROM _91_ids) AND attendanceTypeSymbol = ?;",
+            arrayOf("+ₑ"))
+
+        database.execSQL("DROP TABLE _91_ids;")
+    }
+}