chore: remove unused code

packages/backend/src/services/chart/charts/instance.ts

@@ -67,16 +67,6 @@ export default class InstanceChart extends Chart<typeof schema> {
 
 	@autobind
 	public async updateNote(host: string, note: Note, isAdditional: boolean): Promise<void> {
-		const diffs = {} as Record<string, unknown>;
-
-		if (note.replyId != null) {
-			diffs.reply = isAdditional ? 1 : -1;
-		} else if (note.renoteId != null) {
-			diffs.renote = isAdditional ? 1 : -1;
-		} else {
-			diffs.normal = isAdditional ? 1 : -1;
-		}
-
 		await this.commit({
 			'notes.total': isAdditional ? 1 : -1,
 			'notes.inc': isAdditional ? 1 : 0,