diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 33125a9765..f2e48ec61d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -529,7 +529,8 @@ enumの列挙の内容の削除は、その値をもつレコードを全て削
 ### Migration作成方法
 packages/backendで:
 ```sh
-pnpm dlx typeorm migration:generate -d ormconfig.js -o <migration name>
+pnpm run build
+pnpm dlx typeorm migration:generate -d ormconfig.js -o migration/<migration name>
 ```
 
 - 生成後、ファイルをmigration下に移してください
diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index 7aeeb78178..7ec565557c 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -12,6 +12,8 @@ import { IdService } from '@/core/IdService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { bindThis } from '@/decorators.js';
+import { QueryFailedError } from 'typeorm';
+import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
 
 @Injectable()
 export class FederatedInstanceService implements OnApplicationShutdown {
@@ -56,11 +58,24 @@ export class FederatedInstanceService implements OnApplicationShutdown {
 		const index = await this.instancesRepository.findOneBy({ host });
 
 		if (index == null) {
-			const i = await this.instancesRepository.insertOne({
-				id: this.idService.gen(),
-				host,
-				firstRetrievedAt: new Date(),
-			});
+			let i;
+			try {
+				i = await this.instancesRepository.insertOne({
+					id: this.idService.gen(),
+					host,
+					firstRetrievedAt: new Date(),
+				});
+			} catch (e: unknown) {
+				if (e instanceof QueryFailedError) {
+					if (isDuplicateKeyValueError(e)) {
+						i = await this.instancesRepository.findOneBy({ host });
+					}
+				}
+
+				if (i == null) {
+					throw e;
+				}
+			}
 
 			this.federatedInstanceCache.set(host, i);
 			return i;
diff --git a/packages/backend/src/core/entities/InstanceEntityService.ts b/packages/backend/src/core/entities/InstanceEntityService.ts
index 721cff53bc..63e5923255 100644
--- a/packages/backend/src/core/entities/InstanceEntityService.ts
+++ b/packages/backend/src/core/entities/InstanceEntityService.ts
@@ -59,6 +59,7 @@ export class InstanceEntityService {
 			infoUpdatedAt: instance.infoUpdatedAt ? instance.infoUpdatedAt.toISOString() : null,
 			latestRequestReceivedAt: instance.latestRequestReceivedAt ? instance.latestRequestReceivedAt.toISOString() : null,
 			isNSFW: instance.isNSFW,
+			rejectReports: instance.rejectReports,
 			moderationNote: iAmModerator ? instance.moderationNote : null,
 		};
 	}
diff --git a/packages/backend/src/models/json-schema/federation-instance.ts b/packages/backend/src/models/json-schema/federation-instance.ts
index 062dba9bad..7960e748e9 100644
--- a/packages/backend/src/models/json-schema/federation-instance.ts
+++ b/packages/backend/src/models/json-schema/federation-instance.ts
@@ -121,6 +121,11 @@ export const packedFederationInstanceSchema = {
 			optional: false,
 			nullable: false,
 		},
+		rejectReports: {
+			type: 'boolean',
+			optional: false,
+			nullable: false,
+		},
 		moderationNote: {
 			type: 'string',
 			optional: true, nullable: true,
diff --git a/packages/frontend/src/components/MkReactionsViewer.details.vue b/packages/frontend/src/components/MkReactionsViewer.details.vue
index 8038ec7429..6fdeb3a3ab 100644
--- a/packages/frontend/src/components/MkReactionsViewer.details.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.details.vue
@@ -13,7 +13,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<div :class="$style.users">
 			<div v-for="u in users" :key="u.id" :class="$style.user">
 				<MkAvatar :class="$style.avatar" :user="u"/>
-				<MkUserName :user="u" :nowrap="true"/>
+				<MkUserName :user="u" :nowrap="true" :class="$style.username"/>
 			</div>
 			<div v-if="count > 10" :class="$style.more">+{{ count - 10 }}</div>
 		</div>
@@ -99,4 +99,11 @@ function getReactionName(reaction: string): string {
 .more {
 	padding-top: 4px;
 }
+
+.username {
+	text-overflow: ellipsis;
+	white-space: nowrap;
+	min-width: 0;
+	overflow: hidden;
+}
 </style>
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index e92224480f..4ea0f72bce 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -4808,6 +4808,7 @@ export type components = {
       /** Format: date-time */
       latestRequestReceivedAt: string | null;
       isNSFW: boolean;
+      rejectReports: boolean;
       moderationNote?: string | null;
     };
     GalleryPost: {