upsert reactions to avoid error+retry overhead

packages/backend/src/core/ReactionService.ts

@@ -176,27 +176,10 @@ export class ReactionService {
 			reaction,
 		};
 
-		try {
-			await this.noteReactionsRepository.insert(record);
-		} catch (e) {
-			if (isDuplicateKeyValueError(e)) {
-				const exists = await this.noteReactionsRepository.findOneByOrFail({
-					noteId: note.id,
-					userId: user.id,
-				});
-
-				if (exists.reaction !== reaction) {
-					// 別のリアクションがすでにされていたら置き換える
-					await this.delete(user, note);
-					await this.noteReactionsRepository.insert(record);
-				} else {
-					// 同じリアクションがすでにされていたらエラー
-					throw new IdentifiableError('51c42bb4-931a-456b-bff7-e5a8a70dd298');
-				}
-			} else {
-				throw e;
-			}
-		}
+		await this.noteReactionsRepository.upsert(record, {
+			skipUpdateIfNoValuesChanged: true,
+			conflictPaths: ['noteId', 'userId'],
+		});
 
 		// Increment reactions count
 		if (this.meta.enableReactionsBuffering) {