fix: reduce emby load and stabilize strm scan

internal/database/database_test.go

@@ -45,3 +45,31 @@ func TestEnforceTelegramBindingOneToOneCleansDuplicatesAndAddsIndex(t *testing.T
 		t.Fatal("expected unique index to reject another active binding for the same user")
 	}
 }
+
+func TestEnsurePerformanceIndexesCreatesHotPathIndexes(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.Media{}, &model.Favorite{}, &model.PlaybackHistory{}, &model.PlayProfile{}); err != nil {
+		t.Fatal(err)
+	}
+	if err := ensurePerformanceIndexes(db); err != nil {
+		t.Fatal(err)
+	}
+	for _, name := range []string{
+		"idx_media_library_created_active",
+		"idx_media_library_episode_active",
+		"idx_favorites_user_media_active",
+		"idx_playback_histories_user_media_active",
+		"idx_play_profiles_user_created_active",
+	} {
+		var count int
+		if err := db.Raw(`SELECT COUNT(1) FROM sqlite_master WHERE type = 'index' AND name = ?`, name).Scan(&count).Error; err != nil {
+			t.Fatal(err)
+		}
+		if count != 1 {
+			t.Fatalf("index %s count = %d, want 1", name, count)
+		}
+	}
+}