diff --git a/packages/backend/migration/1697420555911-deleteCreatedAt.js b/packages/backend/migration/1697420555911-deleteCreatedAt.js
deleted file mode 100644
index 958d61a34..000000000
--- a/packages/backend/migration/1697420555911-deleteCreatedAt.js
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and other misskey contributors
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-export class DeleteCreatedAt1697420555911 {
-    name = 'DeleteCreatedAt1697420555911'
-
-    async up(queryRunner) {
-        await queryRunner.query(`DROP INDEX "public"."IDX_02878d441ceae15ce060b73daf"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_c8dfad3b72196dd1d6b5db168a"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_e11e649824a45d8ed01d597fd9"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_db2098070b2b5a523c58181f74"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_048a757923ed8b157e9895da53"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_1129c2ef687fc272df040bafaa"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_118ec703e596086fc4515acb39"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_b9a354f7941c1e779f3b33aea6"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_71cb7b435b7c0d4843317e7e16"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_11e71f2511589dcc8a4d3214f9"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_735a5544f9249d412255f47f95"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_582f8fab771a9040a12961f3e7"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_8f1a239bd077c8864a20c62c2c"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_f86d57fbca33c7a4e6897490cc"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_d1259a2c2b7bb413ff449e8711"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_fbb4297c927a9b85e9cefa2eb1"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_0fb627e1c2f753262a74f0562d"`);
-        await queryRunner.query(`DROP INDEX "public"."IDX_149d2e44785707548c82999b01"`);
-        await queryRunner.query(`ALTER TABLE "drive_folder" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "drive_file" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "abuse_user_report" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "app" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "access_token" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "ad" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "announcement" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "announcement_read" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user_list" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "antenna" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "auth_session" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "blocking" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "channel" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "channel_following" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "channel_favorite" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "clip" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "note" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "clip_favorite" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "following" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "follow_request" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "gallery_post" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "gallery_like" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "moderation_log" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "muting" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "renote_muting" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "note_favorite" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "note_reaction" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "note_thread_muting" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "page" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "page_like" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "password_reset_request" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "poll_vote" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "promo_read" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "registration_ticket" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "registry_item" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "signin" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "sw_subscription" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user_list_favorite" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user_list_membership" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user_note_pining" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "user_pending" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "webhook" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "role" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "role_assignment" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "flash" DROP COLUMN "createdAt"`);
-        await queryRunner.query(`ALTER TABLE "flash_like" DROP COLUMN "createdAt"`);
-    }
-
-    async down(queryRunner) {
-        await queryRunner.query(`ALTER TABLE "flash_like" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "flash" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "role_assignment" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "role" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "webhook" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user_pending" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user_note_pining" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user_list_membership" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user_list_favorite" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "sw_subscription" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "signin" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "registry_item" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "registration_ticket" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "promo_read" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "poll_vote" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "password_reset_request" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "page_like" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "page" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "note_thread_muting" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "note_reaction" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "note_favorite" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "renote_muting" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "muting" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "moderation_log" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "gallery_like" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "gallery_post" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "follow_request" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "following" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "clip_favorite" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "note" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "clip" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "channel_favorite" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "channel_following" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "channel" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "blocking" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "auth_session" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "antenna" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user_list" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "announcement_read" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "announcement" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "ad" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "access_token" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "app" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "abuse_user_report" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "user" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "drive_file" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`ALTER TABLE "drive_folder" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL`);
-        await queryRunner.query(`CREATE INDEX "IDX_149d2e44785707548c82999b01" ON "flash" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_0fb627e1c2f753262a74f0562d" ON "poll_vote" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_fbb4297c927a9b85e9cefa2eb1" ON "page" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_d1259a2c2b7bb413ff449e8711" ON "renote_muting" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_f86d57fbca33c7a4e6897490cc" ON "muting" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_8f1a239bd077c8864a20c62c2c" ON "gallery_post" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_582f8fab771a9040a12961f3e7" ON "following" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_735a5544f9249d412255f47f95" ON "channel_favorite" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_11e71f2511589dcc8a4d3214f9" ON "channel_following" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_71cb7b435b7c0d4843317e7e16" ON "channel" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_b9a354f7941c1e779f3b33aea6" ON "blocking" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_118ec703e596086fc4515acb39" ON "announcement" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_1129c2ef687fc272df040bafaa" ON "ad" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_048a757923ed8b157e9895da53" ON "app" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_db2098070b2b5a523c58181f74" ON "abuse_user_report" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_e11e649824a45d8ed01d597fd9" ON "user" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_c8dfad3b72196dd1d6b5db168a" ON "drive_file" ("createdAt") `);
-        await queryRunner.query(`CREATE INDEX "IDX_02878d441ceae15ce060b73daf" ON "drive_folder" ("createdAt") `);
-    }
-}
diff --git a/packages/backend/migration/1700415938358-createdAt-default.js b/packages/backend/migration/1700415938358-createdAt-default.js
new file mode 100644
index 000000000..deaa7927f
--- /dev/null
+++ b/packages/backend/migration/1700415938358-createdAt-default.js
@@ -0,0 +1,224 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class CreatedAtDefault1700415938358 {
+    name = 'CreatedAtDefault1700415938358'
+
+    async up(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "avatar_decoration" ADD "createdAt" TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "avatar_decoration"."createdAt" IS 'The created date of the AvatarDecoration.'`);
+        await queryRunner.query(`COMMENT ON COLUMN "abuse_report_resolver"."createdAt" IS 'The created date of the AbuseReportResolver.'`);
+        await queryRunner.query(`ALTER TABLE "abuse_report_resolver" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "drive_folder" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "drive_file" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "user" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "abuse_user_report" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "app" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "access_token" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "ad" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "announcement" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "announcement_read" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "user_list" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "antenna" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "auth_session" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "blocking" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "channel" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "channel_following" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "channel_favorite" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "clip" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "note" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "clip_favorite"."createdAt" IS 'The created date of the ClipFavorite.'`);
+        await queryRunner.query(`ALTER TABLE "clip_favorite" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "following" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "follow_request" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "gallery_post" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "gallery_like"."createdAt" IS 'The created date of the GalleryLike.'`);
+        await queryRunner.query(`ALTER TABLE "gallery_like" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "meta" ALTER COLUMN "preservedUsernames" SET DEFAULT '{ "admin", "administrator", "root", "system", "maintainer", "host", "mod", "moderator", "owner", "superuser", "staff", "auth", "i", "me", "everyone", "all", "mention", "mentions", "example", "user", "users", "account", "accounts", "official", "help", "helps", "support", "supports", "info", "information", "informations", "announce", "announces", "announcement", "announcements", "notice", "notification", "notifications", "dev", "developer", "developers", "tech", "misskey" }'`);
+        await queryRunner.query(`ALTER TABLE "moderation_log" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "muting" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "renote_muting"."createdAt" IS 'The created date of the RenoteMuting.'`);
+        await queryRunner.query(`ALTER TABLE "renote_muting" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "note_favorite" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "note_reaction" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "note_thread_muting"."createdAt" IS 'The created date of the NoteThreadMuting.'`);
+        await queryRunner.query(`ALTER TABLE "note_thread_muting" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "page" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "page_like"."createdAt" IS 'The created date of the PageLike.'`);
+        await queryRunner.query(`ALTER TABLE "page_like" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "password_reset_request"."createdAt" IS 'The created date of the PasswordResetRequest.'`);
+        await queryRunner.query(`ALTER TABLE "password_reset_request" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "poll_vote" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "promo_read" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "registration_ticket"."createdAt" IS 'The created date of the RegistrationTicket.'`);
+        await queryRunner.query(`ALTER TABLE "registration_ticket" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "registry_item" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "signin" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "sw_subscription"."createdAt" IS 'The created date of the SwSubscriptipnpon.'`);
+        await queryRunner.query(`ALTER TABLE "sw_subscription" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "used_username"."createdAt" IS 'The created date of the UsedUsername.'`);
+        await queryRunner.query(`ALTER TABLE "used_username" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_ip"."createdAt" IS 'The created date of the UserIp.'`);
+        await queryRunner.query(`ALTER TABLE "user_ip" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_list_favorite"."createdAt" IS 'The created date of the UserListFavorite.'`);
+        await queryRunner.query(`ALTER TABLE "user_list_favorite" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "user_list_membership" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_note_pining"."createdAt" IS 'The created date of the UserNotePining.'`);
+        await queryRunner.query(`ALTER TABLE "user_note_pining" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_pending"."createdAt" IS 'The created date of the UserPending.'`);
+        await queryRunner.query(`ALTER TABLE "user_pending" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "webhook"."createdAt" IS 'The created date of the Webhook.'`);
+        await queryRunner.query(`ALTER TABLE "webhook" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`COMMENT ON COLUMN "retention_aggregation"."createdAt" IS 'The created date of the GalleryPost.'`);
+        await queryRunner.query(`ALTER TABLE "retention_aggregation" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "role" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "role_assignment" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "flash" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`ALTER TABLE "flash" ALTER COLUMN "visibility" SET NOT NULL`);
+        await queryRunner.query(`COMMENT ON COLUMN "flash_like"."createdAt" IS 'The created date of the FlashLike.'`);
+        await queryRunner.query(`ALTER TABLE "flash_like" ALTER COLUMN "createdAt" SET DEFAULT now()`);
+        await queryRunner.query(`CREATE INDEX "IDX_f9b40730606162a441c7acb3e5" ON "access_token" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_cbca0122587e5a757ea0e584f0" ON "announcement_read" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_1383c050b99ba7deb995207afe" ON "user_list" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_9425d976c9cf6d47d2b9956344" ON "antenna" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_a3aca00bb7f8d79408edfefe67" ON "avatar_decoration" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_407e3e07747e5cebb916e77914" ON "auth_session" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_823073a0f1f5d44ef83917e0c4" ON "clip" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_e7c0567f5261063592f022e9b5" ON "note" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_94af6cc88a484caf0cd53bfec9" ON "clip_favorite" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_9a20428737dfc7c515fc31c9bc" ON "follow_request" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_3712d1129515e88dedc7c0ca9b" ON "gallery_like" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_1c32fad73f120e11702982f713" ON "moderation_log" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_b7a97c1435dfa03ab42ab7ec92" ON "note_favorite" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_01f4581f114e0ebd2bbb876f0b" ON "note_reaction" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_51fe96e68f335de120a5f8974b" ON "note_thread_muting" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_b72859eb6173fd2e176aad3fbc" ON "page_like" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_0123b5cc155383f3d380170774" ON "password_reset_request" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_65a0babf63cec88aaa804332a0" ON "promo_read" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_0bf1bd10114284dc984d900c8b" ON "registration_ticket" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_0ff7393a15d37079be4e1f2bd5" ON "registry_item" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_68e9b8637a5b186f242d81e41a" ON "signin" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_8781b31c9b1e5c6c0b1cf904c0" ON "sw_subscription" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_4ac8a879384f3fc210bbaa21bc" ON "used_username" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_e15e78ed889553e314336e4952" ON "user_ip" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_970ffee983708c114a0c289903" ON "user_list_favorite" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_d6d398ea7c0d187aa9a91c4ad0" ON "user_list_membership" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_61347f72791a48bfaa9244eb05" ON "user_note_pining" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_e9181436b1294069148b5ba491" ON "user_pending" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_7ad27f46c9449fe9d6fbb4c79c" ON "webhook" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_3c39bd046f5e69d37f0e4fe768" ON "role" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_fe3eb6be723a95c6b7ce539a4f" ON "role_assignment" ("createdAt") `);
+        await queryRunner.query(`CREATE INDEX "IDX_89523d5c47dc3fcc0bd6793f18" ON "flash_like" ("createdAt") `);
+        await queryRunner.query(`ALTER TABLE "announcement" ADD CONSTRAINT "FK_fd25dfe3da37df1715f11ba6ec8" FOREIGN KEY ("userId") REFERENCES "user"("id") ON DELETE CASCADE ON UPDATE NO ACTION`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`ALTER TABLE "announcement" DROP CONSTRAINT "FK_fd25dfe3da37df1715f11ba6ec8"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_89523d5c47dc3fcc0bd6793f18"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_fe3eb6be723a95c6b7ce539a4f"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_3c39bd046f5e69d37f0e4fe768"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_7ad27f46c9449fe9d6fbb4c79c"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_e9181436b1294069148b5ba491"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_61347f72791a48bfaa9244eb05"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_d6d398ea7c0d187aa9a91c4ad0"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_970ffee983708c114a0c289903"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_e15e78ed889553e314336e4952"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_4ac8a879384f3fc210bbaa21bc"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_8781b31c9b1e5c6c0b1cf904c0"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_68e9b8637a5b186f242d81e41a"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_0ff7393a15d37079be4e1f2bd5"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_0bf1bd10114284dc984d900c8b"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_65a0babf63cec88aaa804332a0"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_0123b5cc155383f3d380170774"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_b72859eb6173fd2e176aad3fbc"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_51fe96e68f335de120a5f8974b"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_01f4581f114e0ebd2bbb876f0b"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_b7a97c1435dfa03ab42ab7ec92"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_1c32fad73f120e11702982f713"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_3712d1129515e88dedc7c0ca9b"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_9a20428737dfc7c515fc31c9bc"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_94af6cc88a484caf0cd53bfec9"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_e7c0567f5261063592f022e9b5"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_823073a0f1f5d44ef83917e0c4"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_407e3e07747e5cebb916e77914"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_a3aca00bb7f8d79408edfefe67"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_9425d976c9cf6d47d2b9956344"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_1383c050b99ba7deb995207afe"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_cbca0122587e5a757ea0e584f0"`);
+        await queryRunner.query(`DROP INDEX "public"."IDX_f9b40730606162a441c7acb3e5"`);
+        await queryRunner.query(`ALTER TABLE "flash_like" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "flash_like"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "flash" ALTER COLUMN "visibility" DROP NOT NULL`);
+        await queryRunner.query(`ALTER TABLE "flash" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "role_assignment" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "role" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "retention_aggregation" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "retention_aggregation"."createdAt" IS 'The created date of the Note.'`);
+        await queryRunner.query(`ALTER TABLE "webhook" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "webhook"."createdAt" IS 'The created date of the Antenna.'`);
+        await queryRunner.query(`ALTER TABLE "user_pending" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_pending"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "user_note_pining" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_note_pining"."createdAt" IS 'The created date of the UserNotePinings.'`);
+        await queryRunner.query(`ALTER TABLE "user_list_membership" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "user_list_favorite" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_list_favorite"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "user_ip" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "user_ip"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "used_username" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "used_username"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "sw_subscription" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "sw_subscription"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "signin" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "registry_item" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "registration_ticket" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "registration_ticket"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "promo_read" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "poll_vote" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "password_reset_request" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "password_reset_request"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "page_like" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "page_like"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "page" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "note_thread_muting" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "note_thread_muting"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "note_reaction" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "note_favorite" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "renote_muting" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "renote_muting"."createdAt" IS 'The created date of the Muting.'`);
+        await queryRunner.query(`ALTER TABLE "muting" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "moderation_log" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "meta" ALTER COLUMN "preservedUsernames" SET DEFAULT '{admin,administrator,root,system,maintainer,host,mod,moderator,owner,superuser,staff,auth,i,me,everyone,all,mention,mentions,example,user,users,account,accounts,official,help,helps,support,supports,info,information,informations,announce,announces,announcement,announcements,notice,notification,notifications,dev,developer,developers,tech,misskey}'`);
+        await queryRunner.query(`ALTER TABLE "gallery_like" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "gallery_like"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "gallery_post" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "follow_request" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "following" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "clip_favorite" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "clip_favorite"."createdAt" IS NULL`);
+        await queryRunner.query(`ALTER TABLE "note" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "clip" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "channel_favorite" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "channel_following" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "channel" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "blocking" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "auth_session" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "antenna" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "user_list" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "announcement_read" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "announcement" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "ad" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "access_token" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "app" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "abuse_user_report" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "user" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "drive_file" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "drive_folder" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`ALTER TABLE "abuse_report_resolver" ALTER COLUMN "createdAt" DROP DEFAULT`);
+        await queryRunner.query(`COMMENT ON COLUMN "abuse_report_resolver"."createdAt" IS 'The created date of AbuseReportResolver'`);
+        await queryRunner.query(`COMMENT ON COLUMN "avatar_decoration"."createdAt" IS 'The created date of the AvatarDecoration.'`);
+        await queryRunner.query(`ALTER TABLE "avatar_decoration" DROP COLUMN "createdAt"`);
+    }
+}
diff --git a/packages/backend/src/core/AnnouncementService.ts b/packages/backend/src/core/AnnouncementService.ts
index c0e7111a7..58b07bef9 100644
--- a/packages/backend/src/core/AnnouncementService.ts
+++ b/packages/backend/src/core/AnnouncementService.ts
@@ -12,9 +12,10 @@ import { MiAnnouncementRead } from '@/models/_.js';
 import { bindThis } from '@/decorators.js';
 import { Packed } from '@/misc/json-schema.js';
 import { IdService } from '@/core/IdService.js';
+import { UserEntityService } from '@/core/entities/UserEntityService.js';
+import { AnnouncementEntityService } from '@/core/entities/AnnouncementEntityService.js';
 import { GlobalEventService } from '@/core/GlobalEventService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
-import { UserEntityService } from '@/core/entities/UserEntityService.js';
 
 @Injectable()
 export class AnnouncementService {
@@ -30,6 +31,7 @@ export class AnnouncementService {
 
 		private idService: IdService,
 		private userEntityService: UserEntityService,
+		private announcementEntityService: AnnouncementEntityService,
 		private globalEventService: GlobalEventService,
 		private moderationLogService: ModerationLogService,
 	) {
@@ -45,7 +47,7 @@ export class AnnouncementService {
 	@bindThis
 	public async getUnreadAnnouncements(user: MiUser): Promise<Packed<'Announcement'>[]> {
 		const q = this.announcementsRepository.createQueryBuilder('announcement');
-		q.leftJoin(
+		q.leftJoinAndSelect(
 			MiAnnouncementRead,
 			'read',
 			'read."announcementId" = announcement.id AND read."userId" = :userId',
@@ -53,7 +55,8 @@ export class AnnouncementService {
 		);
 
 		q
-			.where('announcement.isActive = true')
+			.where('read.id IS NULL')
+			.andWhere('announcement.isActive = true')
 			.andWhere('announcement.silence = false')
 			.andWhere(new Brackets(qb => {
 				qb.orWhere('announcement.userId = :userId', { userId: user.id });
@@ -62,15 +65,14 @@ export class AnnouncementService {
 			.andWhere(new Brackets(qb => {
 				qb.orWhere('announcement.forExistingUsers = false');
 				qb.orWhere('announcement.id > :userId', { userId: user.id });
-			}))
-			.andWhere('read.id IS NULL');
+			}));
 
 		q.orderBy({
 			'announcement."displayOrder"': 'DESC',
 			'announcement.id': 'DESC',
 		});
 
-		return this.packMany(
+		return this.announcementEntityService.packMany(
 			await q.getMany(),
 			user,
 		);
@@ -94,7 +96,7 @@ export class AnnouncementService {
 			userId: values.userId,
 		}).then(x => this.announcementsRepository.findOneByOrFail(x.identifiers[0]));
 
-		const packed = (await this.packMany([announcement], null))[0];
+		const packed = (await this.announcementEntityService.packMany([announcement], null))[0];
 
 		if (values.userId) {
 			this.globalEventService.publishMainStream(values.userId, 'announcementCreated', {
@@ -136,7 +138,7 @@ export class AnnouncementService {
 		limit: number,
 		offset: number,
 		moderator: MiUser,
-	): Promise<(MiAnnouncement & { userInfo: Packed<'UserLite'> | null, readCount: number })[]> {
+	): Promise<(MiAnnouncement & { userInfo: Packed<'UserLite'> | null, reads: number })[]> {
 		const query = this.announcementsRepository.createQueryBuilder('announcement');
 		if (userId) {
 			query.andWhere('announcement."userId" = :userId', { userId: userId });
@@ -173,7 +175,7 @@ export class AnnouncementService {
 		return announcements.map(announcement => ({
 			...announcement,
 			userInfo: packedUsers.find(u => u.id === announcement.userId) ?? null,
-			readCount: reads.get(announcement) ?? 0,
+			reads: reads.get(announcement) ?? 0,
 		}));
 	}
 
@@ -188,6 +190,7 @@ export class AnnouncementService {
 
 		await this.announcementsRepository.update(announcement.id, {
 			updatedAt: new Date(),
+			isActive: values.isActive,
 			title: values.title,
 			text: values.text,
 			/* eslint-disable-next-line @typescript-eslint/prefer-nullish-coalescing -- 空の文字列の場合、nullを渡すようにするため */
@@ -195,11 +198,10 @@ export class AnnouncementService {
 			display: values.display,
 			icon: values.icon,
 			forExistingUsers: values.forExistingUsers,
-			silence: values.silence,
 			needConfirmationToRead: values.needConfirmationToRead,
 			closeDuration: values.closeDuration,
 			displayOrder: values.displayOrder,
-			isActive: values.isActive,
+			silence: values.silence,
 			userId: values.userId,
 		});
 
@@ -305,7 +307,7 @@ export class AnnouncementService {
 			'announcement.id': 'DESC',
 		});
 
-		return this.packMany(
+		return this.announcementEntityService.packMany(
 			await query
 				.limit(limit)
 				.offset(offset)
@@ -315,32 +317,29 @@ export class AnnouncementService {
 	}
 
 	@bindThis
-	public async countUnreadAnnouncements(me: MiUser): Promise<number> {
-		const query = this.announcementsRepository.createQueryBuilder('announcement');
-		query.leftJoinAndSelect(
+	public async countUnreadAnnouncements(user: MiUser): Promise<number> {
+		const q = this.announcementsRepository.createQueryBuilder('announcement');
+		q.leftJoinAndSelect(
 			MiAnnouncementRead,
 			'read',
 			'read."announcementId" = announcement.id AND read."userId" = :userId',
-			{ userId: me.id },
+			{ userId: user.id },
 		);
-		query.andWhere('read.id IS NULL');
-		query.andWhere('announcement."isActive" = true');
 
-		query
-			.andWhere(
-				new Brackets((qb) => {
-					qb.orWhere('announcement."userId" = :userId', { userId: me.id });
-					qb.orWhere('announcement."userId" IS NULL');
-				}),
-			)
-			.andWhere(
-				new Brackets((qb) => {
-					qb.orWhere('announcement."forExistingUsers" = false');
-					qb.orWhere('announcement.id > :userId', { userId: me.id });
-				}),
-			);
+		q
+			.where('read.id IS NULL')
+			.andWhere('announcement.isActive = true')
+			.andWhere('announcement.silence = false')
+			.andWhere(new Brackets(qb => {
+				qb.orWhere('announcement.userId = :userId', { userId: user.id });
+				qb.orWhere('announcement.userId IS NULL');
+			}))
+			.andWhere(new Brackets(qb => {
+				qb.orWhere('announcement.forExistingUsers = false');
+				qb.orWhere('announcement.id > :userId', { userId: user.id });
+			}));
 
-		return query.getCount();
+		return q.getCount();
 	}
 
 	@bindThis
@@ -359,27 +358,4 @@ export class AnnouncementService {
 			this.globalEventService.publishMainStream(user.id, 'readAllAnnouncements');
 		}
 	}
-
-	@bindThis
-	public async packMany(
-		announcements: (MiAnnouncement & { isRead?: boolean | null })[],
-		me: { id: MiUser['id'] } | null | undefined,
-	): Promise<Packed<'Announcement'>[]> {
-		return announcements.map(announcement => ({
-			id: announcement.id,
-			createdAt: this.idService.parse(announcement.id).date.toISOString(),
-			updatedAt: announcement.updatedAt?.toISOString() ?? null,
-			text: announcement.text,
-			title: announcement.title,
-			imageUrl: announcement.imageUrl,
-			icon: announcement.icon,
-			display: announcement.display,
-			needConfirmationToRead: announcement.needConfirmationToRead,
-			closeDuration: announcement.closeDuration,
-			displayOrder: announcement.displayOrder,
-			silence: announcement.silence,
-			forYou: announcement.userId === me?.id,
-			isRead: announcement.isRead ?? undefined,
-		}));
-	}
 }
diff --git a/packages/backend/src/core/AntennaService.ts b/packages/backend/src/core/AntennaService.ts
index 65be27554..cd1f32cc0 100644
--- a/packages/backend/src/core/AntennaService.ts
+++ b/packages/backend/src/core/AntennaService.ts
@@ -57,12 +57,14 @@ export class AntennaService implements OnApplicationShutdown {
 				case 'antennaCreated':
 					this.antennas.push({
 						...body,
+						createdAt: new Date(body.createdAt),
 						lastUsedAt: new Date(body.lastUsedAt),
 					});
 					break;
 				case 'antennaUpdated':
 					this.antennas[this.antennas.findIndex(a => a.id === body.id)] = {
 						...body,
+						createdAt: new Date(body.createdAt),
 						lastUsedAt: new Date(body.lastUsedAt),
 					};
 					break;
diff --git a/packages/backend/src/core/CoreModule.ts b/packages/backend/src/core/CoreModule.ts
index 9fb29e0e6..ef224abcc 100644
--- a/packages/backend/src/core/CoreModule.ts
+++ b/packages/backend/src/core/CoreModule.ts
@@ -80,6 +80,7 @@ import PerUserDriveChart from './chart/charts/per-user-drive.js';
 import ApRequestChart from './chart/charts/ap-request.js';
 import { ChartManagementService } from './chart/ChartManagementService.js';
 import { AbuseUserReportEntityService } from './entities/AbuseUserReportEntityService.js';
+import { AnnouncementEntityService } from './entities/AnnouncementEntityService.js';
 import { AntennaEntityService } from './entities/AntennaEntityService.js';
 import { AppEntityService } from './entities/AppEntityService.js';
 import { AuthSessionEntityService } from './entities/AuthSessionEntityService.js';
@@ -214,6 +215,7 @@ const $ApRequestChart: Provider = { provide: 'ApRequestChart', useExisting: ApRe
 const $ChartManagementService: Provider = { provide: 'ChartManagementService', useExisting: ChartManagementService };
 
 const $AbuseUserReportEntityService: Provider = { provide: 'AbuseUserReportEntityService', useExisting: AbuseUserReportEntityService };
+const $AnnouncementEntityService: Provider = { provide: 'AnnouncementEntityService', useExisting: AnnouncementEntityService };
 const $AntennaEntityService: Provider = { provide: 'AntennaEntityService', useExisting: AntennaEntityService };
 const $AppEntityService: Provider = { provide: 'AppEntityService', useExisting: AppEntityService };
 const $AuthSessionEntityService: Provider = { provide: 'AuthSessionEntityService', useExisting: AuthSessionEntityService };
@@ -348,6 +350,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		ApRequestChart,
 		ChartManagementService,
 		AbuseUserReportEntityService,
+		AnnouncementEntityService,
 		AntennaEntityService,
 		AppEntityService,
 		AuthSessionEntityService,
@@ -477,6 +480,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$ApRequestChart,
 		$ChartManagementService,
 		$AbuseUserReportEntityService,
+		$AnnouncementEntityService,
 		$AntennaEntityService,
 		$AppEntityService,
 		$AuthSessionEntityService,
@@ -606,6 +610,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		ApRequestChart,
 		ChartManagementService,
 		AbuseUserReportEntityService,
+		AnnouncementEntityService,
 		AntennaEntityService,
 		AppEntityService,
 		AuthSessionEntityService,
@@ -734,6 +739,7 @@ const $ApQuestionService: Provider = { provide: 'ApQuestionService', useExisting
 		$ApRequestChart,
 		$ChartManagementService,
 		$AbuseUserReportEntityService,
+		$AnnouncementEntityService,
 		$AntennaEntityService,
 		$AppEntityService,
 		$AuthSessionEntityService,
diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 86f220abd..b6f7ee745 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -382,6 +382,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	private async insertNote(user: { id: MiUser['id']; host: MiUser['host']; }, data: Option, tags: string[], emojis: string[], mentionedUsers: MinimumUser[]) {
 		const insert = new MiNote({
 			id: this.idService.gen(data.createdAt?.getTime()),
+			createdAt: data.createdAt!,
 			fileIds: data.files ? data.files.map(file => file.id) : [],
 			replyId: data.reply ? data.reply.id : null,
 			renoteId: data.renote ? data.renote.id : null,
diff --git a/packages/backend/src/core/ReactionService.ts b/packages/backend/src/core/ReactionService.ts
index 7ce42a3e5..d1560d2fb 100644
--- a/packages/backend/src/core/ReactionService.ts
+++ b/packages/backend/src/core/ReactionService.ts
@@ -158,6 +158,7 @@ export class ReactionService {
 
 		const record: MiNoteReaction = {
 			id: this.idService.gen(),
+			createdAt: new Date(),
 			noteId: note.id,
 			userId: user.id,
 			reaction,
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 671e23a98..5f6e8f606 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -131,6 +131,7 @@ export class RoleService implements OnApplicationShutdown {
 					if (cached) {
 						cached.push({
 							...body,
+							createdAt: new Date(body.createdAt),
 							updatedAt: new Date(body.updatedAt),
 							lastUsedAt: new Date(body.lastUsedAt),
 						});
@@ -144,6 +145,7 @@ export class RoleService implements OnApplicationShutdown {
 						if (i > -1) {
 							cached[i] = {
 								...body,
+								createdAt: new Date(body.createdAt),
 								updatedAt: new Date(body.updatedAt),
 								lastUsedAt: new Date(body.lastUsedAt),
 							};
@@ -163,6 +165,7 @@ export class RoleService implements OnApplicationShutdown {
 					if (cached) {
 						cached.push({
 							...body,
+							createdAt: new Date(body.createdAt),
 							expiresAt: body.expiresAt ? new Date(body.expiresAt) : null,
 						});
 					}
diff --git a/packages/backend/src/core/WebhookService.ts b/packages/backend/src/core/WebhookService.ts
index 930e6ef64..ff70f7bc0 100644
--- a/packages/backend/src/core/WebhookService.ts
+++ b/packages/backend/src/core/WebhookService.ts
@@ -51,6 +51,7 @@ export class WebhookService implements OnApplicationShutdown {
 					if (body.active) {
 						this.webhooks.push({
 							...body,
+							createdAt: new Date(body.createdAt),
 							latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 						});
 					}
@@ -61,11 +62,13 @@ export class WebhookService implements OnApplicationShutdown {
 						if (i > -1) {
 							this.webhooks[i] = {
 								...body,
+								createdAt: new Date(body.createdAt),
 								latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 							};
 						} else {
 							this.webhooks.push({
 								...body,
+								createdAt: new Date(body.createdAt),
 								latestSentAt: body.latestSentAt ? new Date(body.latestSentAt) : null,
 							});
 						}
diff --git a/packages/backend/src/core/entities/AnnouncementEntityService.ts b/packages/backend/src/core/entities/AnnouncementEntityService.ts
new file mode 100644
index 000000000..2dc2c2cc3
--- /dev/null
+++ b/packages/backend/src/core/entities/AnnouncementEntityService.ts
@@ -0,0 +1,73 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import type { AnnouncementsRepository, AnnouncementReadsRepository, MiAnnouncement, MiUser } from "@/models/_.js";
+import type { Packed } from '@/misc/json-schema.js';
+import { bindThis } from '@/decorators.js';
+import { IdService } from '@/core/IdService.js';
+
+@Injectable()
+export class AnnouncementEntityService {
+	constructor(
+		@Inject(DI.announcementsRepository)
+		private announcementsRepository: AnnouncementsRepository,
+
+		@Inject(DI.announcementReadsRepository)
+		private announcementReadsRepository: AnnouncementReadsRepository,
+
+		private idService: IdService,
+	) {
+	}
+
+	@bindThis
+	public async pack(
+		src: MiAnnouncement['id'] | MiAnnouncement & { isRead?: boolean | null },
+		me: { id: MiUser['id'] } | null | undefined,
+	): Promise<Packed<'Announcement'>> {
+		const announcement = typeof src === 'object'
+			? src
+			: await this.announcementsRepository.findOneByOrFail({
+				id: src,
+			}) as MiAnnouncement & { isRead?: boolean | null };
+
+		if (me && announcement.isRead === undefined) {
+			announcement.isRead = await this.announcementReadsRepository
+				.countBy({
+					announcementId: announcement.id,
+					userId: me.id,
+				})
+				.then((count: number) => count > 0);
+		}
+
+		return {
+			id: announcement.id,
+			createdAt: this.idService.parse(announcement.id).date.toISOString(),
+			updatedAt: announcement.updatedAt?.toISOString() ?? null,
+			title: announcement.title,
+			text: announcement.text,
+			imageUrl: announcement.imageUrl,
+			icon: announcement.icon,
+			display: announcement.display,
+			forYou: announcement.userId === me?.id,
+			needConfirmationToRead: announcement.needConfirmationToRead,
+			closeDuration: announcement.closeDuration,
+			displayOrder: announcement.displayOrder,
+			silence: announcement.silence,
+			isRead: announcement.isRead !== null ? announcement.isRead : undefined,
+		};
+	}
+
+	@bindThis
+	public async packMany(
+		announcements: (MiAnnouncement['id'] | MiAnnouncement & { isRead?: boolean | null } | MiAnnouncement)[],
+		me: { id: MiUser['id'] } | null | undefined,
+	) : Promise<Packed<'Announcement'>[]> {
+		return (await Promise.allSettled(announcements.map(x => this.pack(x, me))))
+			.filter(result => result.status === 'fulfilled')
+			.map(result => (result as PromiseFulfilledResult<Packed<'Announcement'>>).value);
+	}
+}
diff --git a/packages/backend/src/models/AbuseReportResolver.ts b/packages/backend/src/models/AbuseReportResolver.ts
index 47dc4f1e5..e3174068f 100644
--- a/packages/backend/src/models/AbuseReportResolver.ts
+++ b/packages/backend/src/models/AbuseReportResolver.ts
@@ -13,7 +13,8 @@ export class MiAbuseReportResolver {
 
 	@Index()
 	@Column('timestamp with time zone', {
-		comment: 'The created date of AbuseReportResolver',
+		comment: 'The created date of the AbuseReportResolver.',
+		default: () => 'CURRENT_TIMESTAMP',
 	})
 	public createdAt: Date;
 
diff --git a/packages/backend/src/models/AbuseUserReport.ts b/packages/backend/src/models/AbuseUserReport.ts
index 593c44f66..17491595c 100644
--- a/packages/backend/src/models/AbuseUserReport.ts
+++ b/packages/backend/src/models/AbuseUserReport.ts
@@ -12,6 +12,13 @@ export class MiAbuseUserReport {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the AbuseUserReport.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public targetUserId: MiUser['id'];
diff --git a/packages/backend/src/models/AccessToken.ts b/packages/backend/src/models/AccessToken.ts
index 452711eb8..66bf626ac 100644
--- a/packages/backend/src/models/AccessToken.ts
+++ b/packages/backend/src/models/AccessToken.ts
@@ -13,6 +13,13 @@ export class MiAccessToken {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the AccessToken.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('timestamp with time zone', {
 		nullable: true,
 	})
diff --git a/packages/backend/src/models/Ad.ts b/packages/backend/src/models/Ad.ts
index b1d7d7d79..95afe9ade 100644
--- a/packages/backend/src/models/Ad.ts
+++ b/packages/backend/src/models/Ad.ts
@@ -11,6 +11,13 @@ export class MiAd {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Ad.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		comment: 'The expired date of the Ad.',
diff --git a/packages/backend/src/models/Announcement.ts b/packages/backend/src/models/Announcement.ts
index 54f23ee8b..140a9fe18 100644
--- a/packages/backend/src/models/Announcement.ts
+++ b/packages/backend/src/models/Announcement.ts
@@ -12,6 +12,13 @@ export class MiAnnouncement {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Announcement.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the Announcement.',
 		nullable: true,
diff --git a/packages/backend/src/models/AnnouncementRead.ts b/packages/backend/src/models/AnnouncementRead.ts
index db09e65f5..a2a696c3d 100644
--- a/packages/backend/src/models/AnnouncementRead.ts
+++ b/packages/backend/src/models/AnnouncementRead.ts
@@ -14,6 +14,13 @@ export class MiAnnouncementRead {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the AnnouncementRead.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/Antenna.ts b/packages/backend/src/models/Antenna.ts
index b74c61b72..2e58e1ee6 100644
--- a/packages/backend/src/models/Antenna.ts
+++ b/packages/backend/src/models/Antenna.ts
@@ -13,6 +13,13 @@ export class MiAntenna {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Antenna.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone')
 	public lastUsedAt: Date;
diff --git a/packages/backend/src/models/App.ts b/packages/backend/src/models/App.ts
index 5c56a224a..1f6f419b2 100644
--- a/packages/backend/src/models/App.ts
+++ b/packages/backend/src/models/App.ts
@@ -12,6 +12,13 @@ export class MiApp {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the App.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/AuthSession.ts b/packages/backend/src/models/AuthSession.ts
index 81bed2121..5b1ab4097 100644
--- a/packages/backend/src/models/AuthSession.ts
+++ b/packages/backend/src/models/AuthSession.ts
@@ -13,6 +13,13 @@ export class MiAuthSession {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the AuthSession.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('varchar', {
 		length: 128,
diff --git a/packages/backend/src/models/AvatarDecoration.ts b/packages/backend/src/models/AvatarDecoration.ts
index 08ebbdeac..5a723edff 100644
--- a/packages/backend/src/models/AvatarDecoration.ts
+++ b/packages/backend/src/models/AvatarDecoration.ts
@@ -11,6 +11,13 @@ export class MiAvatarDecoration {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the AvatarDecoration.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('timestamp with time zone', {
 		nullable: true,
 	})
diff --git a/packages/backend/src/models/Blocking.ts b/packages/backend/src/models/Blocking.ts
index 9bf7a63b6..3c812c8f3 100644
--- a/packages/backend/src/models/Blocking.ts
+++ b/packages/backend/src/models/Blocking.ts
@@ -13,6 +13,13 @@ export class MiBlocking {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Blocking.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/Channel.ts b/packages/backend/src/models/Channel.ts
index a7f9e262b..a45f34013 100644
--- a/packages/backend/src/models/Channel.ts
+++ b/packages/backend/src/models/Channel.ts
@@ -13,6 +13,13 @@ export class MiChannel {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Channel.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		nullable: true,
diff --git a/packages/backend/src/models/ChannelFavorite.ts b/packages/backend/src/models/ChannelFavorite.ts
index fc25ffe26..33bdeb862 100644
--- a/packages/backend/src/models/ChannelFavorite.ts
+++ b/packages/backend/src/models/ChannelFavorite.ts
@@ -14,6 +14,13 @@ export class MiChannelFavorite {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the ChannelFavorite.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/ChannelFollowing.ts b/packages/backend/src/models/ChannelFollowing.ts
index 4dd391a08..02aae0ab4 100644
--- a/packages/backend/src/models/ChannelFollowing.ts
+++ b/packages/backend/src/models/ChannelFollowing.ts
@@ -14,6 +14,13 @@ export class MiChannelFollowing {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the ChannelFollowing.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/Clip.ts b/packages/backend/src/models/Clip.ts
index 2483b0925..27b7cde4f 100644
--- a/packages/backend/src/models/Clip.ts
+++ b/packages/backend/src/models/Clip.ts
@@ -12,6 +12,13 @@ export class MiClip {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Clip.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		nullable: true,
diff --git a/packages/backend/src/models/ClipFavorite.ts b/packages/backend/src/models/ClipFavorite.ts
index aa949b3ea..4c9dd7321 100644
--- a/packages/backend/src/models/ClipFavorite.ts
+++ b/packages/backend/src/models/ClipFavorite.ts
@@ -14,6 +14,13 @@ export class MiClipFavorite {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the ClipFavorite.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/DriveFile.ts b/packages/backend/src/models/DriveFile.ts
index 24e6be9c9..84cc003a4 100644
--- a/packages/backend/src/models/DriveFile.ts
+++ b/packages/backend/src/models/DriveFile.ts
@@ -14,6 +14,13 @@ export class MiDriveFile {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the DriveFile.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/DriveFolder.ts b/packages/backend/src/models/DriveFolder.ts
index 18f6d1770..73347c7b2 100644
--- a/packages/backend/src/models/DriveFolder.ts
+++ b/packages/backend/src/models/DriveFolder.ts
@@ -12,6 +12,13 @@ export class MiDriveFolder {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the DriveFolder.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('varchar', {
 		length: 128,
 		comment: 'The name of the DriveFolder.',
diff --git a/packages/backend/src/models/Flash.ts b/packages/backend/src/models/Flash.ts
index ac880843b..b89065f64 100644
--- a/packages/backend/src/models/Flash.ts
+++ b/packages/backend/src/models/Flash.ts
@@ -12,6 +12,13 @@ export class MiFlash {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Flash.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the Flash.',
diff --git a/packages/backend/src/models/FlashLike.ts b/packages/backend/src/models/FlashLike.ts
index ad7f4966b..9b3a52e42 100644
--- a/packages/backend/src/models/FlashLike.ts
+++ b/packages/backend/src/models/FlashLike.ts
@@ -14,6 +14,13 @@ export class MiFlashLike {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the FlashLike.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/FollowRequest.ts b/packages/backend/src/models/FollowRequest.ts
index 9899694dd..39ba50450 100644
--- a/packages/backend/src/models/FollowRequest.ts
+++ b/packages/backend/src/models/FollowRequest.ts
@@ -13,6 +13,13 @@ export class MiFollowRequest {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the FollowRequest.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/Following.ts b/packages/backend/src/models/Following.ts
index e320911a1..8ce333df2 100644
--- a/packages/backend/src/models/Following.ts
+++ b/packages/backend/src/models/Following.ts
@@ -14,6 +14,13 @@ export class MiFollowing {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Following.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/GalleryLike.ts b/packages/backend/src/models/GalleryLike.ts
index 84d4ce9c3..ab9b2a32a 100644
--- a/packages/backend/src/models/GalleryLike.ts
+++ b/packages/backend/src/models/GalleryLike.ts
@@ -14,6 +14,13 @@ export class MiGalleryLike {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the GalleryLike.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/GalleryPost.ts b/packages/backend/src/models/GalleryPost.ts
index b72220caf..ea7d4320b 100644
--- a/packages/backend/src/models/GalleryPost.ts
+++ b/packages/backend/src/models/GalleryPost.ts
@@ -13,6 +13,13 @@ export class MiGalleryPost {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the GalleryPost.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the GalleryPost.',
diff --git a/packages/backend/src/models/ModerationLog.ts b/packages/backend/src/models/ModerationLog.ts
index 71b33c3e4..b1ca16291 100644
--- a/packages/backend/src/models/ModerationLog.ts
+++ b/packages/backend/src/models/ModerationLog.ts
@@ -12,6 +12,13 @@ export class MiModerationLog {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the ModerationLog.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/Muting.ts b/packages/backend/src/models/Muting.ts
index a528e1e7d..76655f55d 100644
--- a/packages/backend/src/models/Muting.ts
+++ b/packages/backend/src/models/Muting.ts
@@ -13,6 +13,13 @@ export class MiMuting {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Muting.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		nullable: true,
diff --git a/packages/backend/src/models/Note.ts b/packages/backend/src/models/Note.ts
index a4358b9ba..8bb794d46 100644
--- a/packages/backend/src/models/Note.ts
+++ b/packages/backend/src/models/Note.ts
@@ -18,6 +18,13 @@ export class MiNote {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Note.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/NoteFavorite.ts b/packages/backend/src/models/NoteFavorite.ts
index 364eaabd9..0790b26fc 100644
--- a/packages/backend/src/models/NoteFavorite.ts
+++ b/packages/backend/src/models/NoteFavorite.ts
@@ -14,6 +14,13 @@ export class MiNoteFavorite {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the NoteFavorite.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/NoteReaction.ts b/packages/backend/src/models/NoteReaction.ts
index ee3a44746..f71574bb5 100644
--- a/packages/backend/src/models/NoteReaction.ts
+++ b/packages/backend/src/models/NoteReaction.ts
@@ -14,6 +14,13 @@ export class MiNoteReaction {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the NoteReaction.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/NoteThreadMuting.ts b/packages/backend/src/models/NoteThreadMuting.ts
index 00311aa57..e2e1d95eb 100644
--- a/packages/backend/src/models/NoteThreadMuting.ts
+++ b/packages/backend/src/models/NoteThreadMuting.ts
@@ -13,6 +13,13 @@ export class MiNoteThreadMuting {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the NoteThreadMuting.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/Page.ts b/packages/backend/src/models/Page.ts
index 9cab87549..7b5248464 100644
--- a/packages/backend/src/models/Page.ts
+++ b/packages/backend/src/models/Page.ts
@@ -14,6 +14,13 @@ export class MiPage {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Page.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the Page.',
diff --git a/packages/backend/src/models/PageLike.ts b/packages/backend/src/models/PageLike.ts
index b845f58b7..8e866284e 100644
--- a/packages/backend/src/models/PageLike.ts
+++ b/packages/backend/src/models/PageLike.ts
@@ -14,6 +14,13 @@ export class MiPageLike {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the PageLike.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/PasswordResetRequest.ts b/packages/backend/src/models/PasswordResetRequest.ts
index 5be439511..ec856b14f 100644
--- a/packages/backend/src/models/PasswordResetRequest.ts
+++ b/packages/backend/src/models/PasswordResetRequest.ts
@@ -12,6 +12,13 @@ export class MiPasswordResetRequest {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the PasswordResetRequest.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index({ unique: true })
 	@Column('varchar', {
 		length: 256,
diff --git a/packages/backend/src/models/PollVote.ts b/packages/backend/src/models/PollVote.ts
index 751be8a32..777bc3c7b 100644
--- a/packages/backend/src/models/PollVote.ts
+++ b/packages/backend/src/models/PollVote.ts
@@ -14,6 +14,13 @@ export class MiPollVote {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the PollVote.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/PromoRead.ts b/packages/backend/src/models/PromoRead.ts
index d9f307541..4b617b569 100644
--- a/packages/backend/src/models/PromoRead.ts
+++ b/packages/backend/src/models/PromoRead.ts
@@ -14,6 +14,13 @@ export class MiPromoRead {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the PromoRead.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/RegistrationTicket.ts b/packages/backend/src/models/RegistrationTicket.ts
index 730cedffb..d19d280da 100644
--- a/packages/backend/src/models/RegistrationTicket.ts
+++ b/packages/backend/src/models/RegistrationTicket.ts
@@ -12,6 +12,13 @@ export class MiRegistrationTicket {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the RegistrationTicket.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index({ unique: true })
 	@Column('varchar', {
 		length: 64,
diff --git a/packages/backend/src/models/RegistryItem.ts b/packages/backend/src/models/RegistryItem.ts
index 60bdced95..5388a166c 100644
--- a/packages/backend/src/models/RegistryItem.ts
+++ b/packages/backend/src/models/RegistryItem.ts
@@ -13,6 +13,13 @@ export class MiRegistryItem {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the RegistryItem.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the RegistryItem.',
 	})
diff --git a/packages/backend/src/models/RenoteMuting.ts b/packages/backend/src/models/RenoteMuting.ts
index 17df43ea3..1f86255b9 100644
--- a/packages/backend/src/models/RenoteMuting.ts
+++ b/packages/backend/src/models/RenoteMuting.ts
@@ -13,6 +13,13 @@ export class MiRenoteMuting {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the RenoteMuting.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/RetentionAggregation.ts b/packages/backend/src/models/RetentionAggregation.ts
index 9da401597..85811baec 100644
--- a/packages/backend/src/models/RetentionAggregation.ts
+++ b/packages/backend/src/models/RetentionAggregation.ts
@@ -14,7 +14,8 @@ export class MiRetentionAggregation {
 
 	@Index()
 	@Column('timestamp with time zone', {
-		comment: 'The created date of the Note.',
+		comment: 'The created date of the GalleryPost.',
+		default: () => 'CURRENT_TIMESTAMP',
 	})
 	public createdAt: Date;
 
diff --git a/packages/backend/src/models/Role.ts b/packages/backend/src/models/Role.ts
index 6976956e1..0839dd85f 100644
--- a/packages/backend/src/models/Role.ts
+++ b/packages/backend/src/models/Role.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { Entity, Column, PrimaryColumn } from 'typeorm';
+import { Entity, Column, PrimaryColumn, Index } from 'typeorm';
 import { id } from './util/id.js';
 
 type CondFormulaValueAnd = {
@@ -89,6 +89,13 @@ export class MiRole {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Role.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Column('timestamp with time zone', {
 		comment: 'The updated date of the Role.',
 	})
diff --git a/packages/backend/src/models/RoleAssignment.ts b/packages/backend/src/models/RoleAssignment.ts
index 30c7e19f2..5139ef84e 100644
--- a/packages/backend/src/models/RoleAssignment.ts
+++ b/packages/backend/src/models/RoleAssignment.ts
@@ -14,6 +14,13 @@ export class MiRoleAssignment {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the RoleAssignment.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/Signin.ts b/packages/backend/src/models/Signin.ts
index 656b44dfe..6472c4aaf 100644
--- a/packages/backend/src/models/Signin.ts
+++ b/packages/backend/src/models/Signin.ts
@@ -12,6 +12,13 @@ export class MiSignin {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Signin.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/SwSubscription.ts b/packages/backend/src/models/SwSubscription.ts
index f685a8ff3..13ad937d7 100644
--- a/packages/backend/src/models/SwSubscription.ts
+++ b/packages/backend/src/models/SwSubscription.ts
@@ -12,6 +12,13 @@ export class MiSwSubscription {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the SwSubscriptipnpon.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/UsedUsername.ts b/packages/backend/src/models/UsedUsername.ts
index c75bf424c..3f5a96162 100644
--- a/packages/backend/src/models/UsedUsername.ts
+++ b/packages/backend/src/models/UsedUsername.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { PrimaryColumn, Entity, Column } from 'typeorm';
+import { PrimaryColumn, Entity, Column, Index } from 'typeorm';
 
 @Entity('used_username')
 export class MiUsedUsername {
@@ -12,7 +12,11 @@ export class MiUsedUsername {
 	})
 	public username: string;
 
-	@Column('timestamp with time zone')
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UsedUsername.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
 	public createdAt: Date;
 
 	constructor(data: Partial<MiUsedUsername>) {
diff --git a/packages/backend/src/models/User.ts b/packages/backend/src/models/User.ts
index c3762fcd3..1d69bbda6 100644
--- a/packages/backend/src/models/User.ts
+++ b/packages/backend/src/models/User.ts
@@ -13,6 +13,13 @@ export class MiUser {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the User.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column('timestamp with time zone', {
 		nullable: true,
diff --git a/packages/backend/src/models/UserIp.ts b/packages/backend/src/models/UserIp.ts
index 60a7bc8b0..f838e1ad1 100644
--- a/packages/backend/src/models/UserIp.ts
+++ b/packages/backend/src/models/UserIp.ts
@@ -13,7 +13,10 @@ export class MiUserIp {
 	@PrimaryGeneratedColumn()
 	public id: string;
 
+	@Index()
 	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserIp.',
+		default: () => 'CURRENT_TIMESTAMP',
 	})
 	public createdAt: Date;
 
diff --git a/packages/backend/src/models/UserList.ts b/packages/backend/src/models/UserList.ts
index 7ad15419d..2fce93e74 100644
--- a/packages/backend/src/models/UserList.ts
+++ b/packages/backend/src/models/UserList.ts
@@ -12,6 +12,13 @@ export class MiUserList {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserList.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/UserListFavorite.ts b/packages/backend/src/models/UserListFavorite.ts
index a18ed9253..e095ebc53 100644
--- a/packages/backend/src/models/UserListFavorite.ts
+++ b/packages/backend/src/models/UserListFavorite.ts
@@ -14,6 +14,13 @@ export class MiUserListFavorite {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserListFavorite.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/UserListMembership.ts b/packages/backend/src/models/UserListMembership.ts
index fa8287f17..a779b6355 100644
--- a/packages/backend/src/models/UserListMembership.ts
+++ b/packages/backend/src/models/UserListMembership.ts
@@ -14,6 +14,13 @@ export class MiUserListMembership {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserListMembership.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/UserNotePining.ts b/packages/backend/src/models/UserNotePining.ts
index ae5977aa5..630eeedf8 100644
--- a/packages/backend/src/models/UserNotePining.ts
+++ b/packages/backend/src/models/UserNotePining.ts
@@ -14,6 +14,13 @@ export class MiUserNotePining {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserNotePining.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column(id())
 	public userId: MiUser['id'];
diff --git a/packages/backend/src/models/UserPending.ts b/packages/backend/src/models/UserPending.ts
index 8b1f8f617..b4cd0e24c 100644
--- a/packages/backend/src/models/UserPending.ts
+++ b/packages/backend/src/models/UserPending.ts
@@ -11,6 +11,13 @@ export class MiUserPending {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the UserPending.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index({ unique: true })
 	@Column('varchar', {
 		length: 128,
diff --git a/packages/backend/src/models/Webhook.ts b/packages/backend/src/models/Webhook.ts
index ec4e13cc7..6bf4a3407 100644
--- a/packages/backend/src/models/Webhook.ts
+++ b/packages/backend/src/models/Webhook.ts
@@ -14,6 +14,13 @@ export class MiWebhook {
 	@PrimaryColumn(id())
 	public id: string;
 
+	@Index()
+	@Column('timestamp with time zone', {
+		comment: 'The created date of the Webhook.',
+		default: () => 'CURRENT_TIMESTAMP',
+	})
+	public createdAt: Date;
+
 	@Index()
 	@Column({
 		...id(),
diff --git a/packages/backend/src/models/json-schema/announcement.ts b/packages/backend/src/models/json-schema/announcement.ts
index e23620e99..fdeea862e 100644
--- a/packages/backend/src/models/json-schema/announcement.ts
+++ b/packages/backend/src/models/json-schema/announcement.ts
@@ -58,6 +58,10 @@ export const packedAnnouncementSchema = {
 			type: 'number',
 			optional: false, nullable: false,
 		},
+		silence: {
+			type: 'boolean',
+			optional: false, nullable: false,
+		},
 		isRead: {
 			type: 'boolean',
 			optional: true, nullable: false,
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
index 1bb02b476..c790a826a 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/create.ts
@@ -69,6 +69,10 @@ export const meta = {
 				type: 'number',
 				optional: false, nullable: false,
 			},
+			silence: {
+				type: 'boolean',
+				optional: false, nullable: false,
+			},
 			isRead: {
 				type: 'boolean',
 				optional: true, nullable: false,
@@ -86,10 +90,10 @@ export const paramDef = {
 		icon: { type: 'string', enum: ['info', 'warning', 'error', 'success'], default: 'info' },
 		display: { type: 'string', enum: ['normal', 'banner', 'dialog'], default: 'normal' },
 		forExistingUsers: { type: 'boolean', default: false },
-		silence: { type: 'boolean', default: false },
 		needConfirmationToRead: { type: 'boolean', default: false },
 		closeDuration: { type: 'number', default: 0 },
 		displayOrder: { type: 'number', default: 0 },
+		silence: { type: 'boolean', default: false },
 		userId: { type: 'string', format: 'misskey:id', nullable: true, default: null },
 	},
 	required: ['title', 'text', 'imageUrl'],
@@ -109,10 +113,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				icon: ps.icon,
 				display: ps.display,
 				forExistingUsers: ps.forExistingUsers,
-				silence: ps.silence,
 				needConfirmationToRead: ps.needConfirmationToRead,
 				closeDuration: ps.closeDuration,
 				displayOrder: ps.displayOrder,
+				silence: ps.silence,
 				userId: ps.userId,
 			}, me);
 
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/list.ts b/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
index 6b16efa30..869308f61 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/list.ts
@@ -79,6 +79,10 @@ export const meta = {
 					type: 'number',
 					optional: false, nullable: false,
 				},
+				silence: {
+					type: 'boolean',
+					optional: false, nullable: false,
+				},
 				userId: {
 					type: 'string',
 					optional: false, nullable: true,
@@ -128,13 +132,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				display: announcement.display,
 				isActive: announcement.isActive,
 				forExistingUsers: announcement.forExistingUsers,
-				silence: announcement.silence,
 				needConfirmationToRead: announcement.needConfirmationToRead,
 				closeDuration: announcement.closeDuration,
 				displayOrder: announcement.displayOrder,
+				silence: announcement.silence,
 				userId: announcement.userId,
 				user: announcement.userInfo,
-				reads: announcement.readCount,
+				reads: announcement.reads,
 			}));
 		});
 	}
diff --git a/packages/backend/src/server/api/endpoints/admin/announcements/update.ts b/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
index 04d6836fd..93176d751 100644
--- a/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/announcements/update.ts
@@ -35,10 +35,10 @@ export const paramDef = {
 		icon: { type: 'string', enum: ['info', 'warning', 'error', 'success'] },
 		display: { type: 'string', enum: ['normal', 'banner', 'dialog'] },
 		forExistingUsers: { type: 'boolean' },
-		silence: { type: 'boolean' },
 		needConfirmationToRead: { type: 'boolean' },
 		closeDuration: { type: 'number', default: 0 },
 		displayOrder: { type: 'number', default: 0 },
+		silence: { type: 'boolean' },
 		isActive: { type: 'boolean' },
 	},
 	required: ['id'],
@@ -66,10 +66,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				display: ps.display,
 				icon: ps.icon,
 				forExistingUsers: ps.forExistingUsers,
-				silence: ps.silence,
 				needConfirmationToRead: ps.needConfirmationToRead,
 				closeDuration: ps.closeDuration,
 				displayOrder: ps.displayOrder,
+				silence: ps.silence,
 				isActive: ps.isActive,
 			}, me);
 		});
diff --git a/packages/backend/test/unit/AnnouncementService.ts b/packages/backend/test/unit/AnnouncementService.ts
index f2aa5d35e..d001dc8e8 100644
--- a/packages/backend/test/unit/AnnouncementService.ts
+++ b/packages/backend/test/unit/AnnouncementService.ts
@@ -10,6 +10,7 @@ import { ModuleMocker } from 'jest-mock';
 import { Test } from '@nestjs/testing';
 import { GlobalModule } from '@/GlobalModule.js';
 import { AnnouncementService } from '@/core/AnnouncementService.js';
+import { AnnouncementEntityService } from "@/core/entities/AnnouncementEntityService.js";
 import type { MiAnnouncement, AnnouncementsRepository, AnnouncementReadsRepository, UsersRepository, MiUser } from '@/models/_.js';
 import { DI } from '@/di-symbols.js';
 import { genAidx } from '@/misc/id/aidx.js';
@@ -61,6 +62,7 @@ describe('AnnouncementService', () => {
 			],
 			providers: [
 				AnnouncementService,
+				AnnouncementEntityService,
 				CacheService,
 				IdService,
 			],
diff --git a/packages/frontend/src/components/MkUserAnnouncementEditDialog.vue b/packages/frontend/src/components/MkUserAnnouncementEditDialog.vue
index 3d0700cb8..fc58dac07 100644
--- a/packages/frontend/src/components/MkUserAnnouncementEditDialog.vue
+++ b/packages/frontend/src/components/MkUserAnnouncementEditDialog.vue
@@ -49,7 +49,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkInput v-model="displayOrder" type="number">
 					<template #label>{{ i18n.ts.displayOrder }}</template>
 				</MkInput>
-				<p v-if="readCount">{{ i18n.t('nUsersRead', { n: readCount }) }}</p>
+				<MkSwitch v-model="silence">
+					{{ i18n.ts._announcement.silence }}
+					<template #caption>{{ i18n.ts._announcement.silenceDescription }}</template>
+				</MkSwitch>
+				<p v-if="reads">{{ i18n.t('nUsersRead', { n: reads }) }}</p>
 				<MkUserCardMini v-if="props.user.id" :user="props.user"></MkUserCardMini>
 				<MkButton v-if="announcement" danger @click="del()"><i class="ti ti-trash"></i> {{ i18n.ts.delete }}</MkButton>
 			</div>
@@ -62,7 +66,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { } from 'vue';
 import * as Misskey from 'misskey-js';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import MkButton from '@/components/MkButton.vue';
@@ -87,7 +90,8 @@ let display: string = $ref(props.announcement ? props.announcement.display : 'di
 let needConfirmationToRead: boolean = $ref(props.announcement ? props.announcement.needConfirmationToRead : false);
 let closeDuration: number = $ref(props.announcement ? props.announcement.closeDuration : 0);
 let displayOrder: number = $ref(props.announcement ? props.announcement.displayOrder : 0);
-let readCount: number = $ref(props.announcement ? props.announcement.readCount : 0);
+let silence: boolean = $ref(props.announcement ? props.announcement.silence : false);
+let reads: number = $ref(props.announcement ? props.announcement.reads : 0);
 
 const emit = defineEmits<{
 	(ev: 'done', v: { deleted?: boolean; updated?: any; created?: any }): void,
@@ -110,7 +114,8 @@ async function done(): Promise<void> {
 		needConfirmationToRead: needConfirmationToRead,
 		closeDuration: closeDuration,
 		displayOrder: displayOrder,
-		readCount: readCount,
+		silence: silence,
+		reads: reads,
 		userId: props.user.id,
 	};
 
diff --git a/packages/frontend/src/pages/admin/announcements.vue b/packages/frontend/src/pages/admin/announcements.vue
index 68d42fec5..0fd52c72d 100644
--- a/packages/frontend/src/pages/admin/announcements.vue
+++ b/packages/frontend/src/pages/admin/announcements.vue
@@ -63,9 +63,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkSwitch v-model="announcement.forExistingUsers" :helpText="i18n.ts._announcement.forExistingUsersDescription">
 						{{ i18n.ts._announcement.forExistingUsers }}
 					</MkSwitch>
-					<MkSwitch v-model="announcement.silence" :helpText="i18n.ts._announcement.silenceDescription">
-						{{ i18n.ts._announcement.silence }}
-					</MkSwitch>
 					<MkSwitch v-model="announcement.needConfirmationToRead" :helpText="i18n.ts._announcement.needConfirmationToReadDescription">
 						{{ i18n.ts._announcement.needConfirmationToRead }}
 					</MkSwitch>
@@ -76,6 +73,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<MkInput v-model="announcement.displayOrder" type="number">
 						<template #label>{{ i18n.ts.displayOrder }}</template>
 					</MkInput>
+					<MkSwitch v-model="announcement.silence" :helpText="i18n.ts._announcement.silenceDescription">
+						{{ i18n.ts._announcement.silence }}
+					</MkSwitch>
 					<p v-if="announcement.reads">{{ i18n.t('nUsersRead', { n: announcement.reads }) }}</p>
 					<MkUserCardMini v-if="announcement.userId" :user="announcement.user" @click="editUser(announcement)"></MkUserCardMini>
 					<MkButton v-else class="button" inline primary @click="editUser(announcement)">{{ i18n.ts.specifyUser }}</MkButton>
@@ -144,10 +144,10 @@ function add() {
 		icon: 'info',
 		display: 'normal',
 		forExistingUsers: false,
-		silence: false,
 		needConfirmationToRead: false,
 		closeDuration: 0,
 		displayOrder: 0,
+		silence: false,
 	});
 }
 
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index 7ceacccff..b22e1d0c4 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -49,6 +49,7 @@ type Announcement = {
     needConfirmationToRead: boolean;
     closeDuration: number;
     displayOrder: number;
+    silence: boolean;
     forYou: boolean;
     isRead?: boolean;
 };
@@ -3073,7 +3074,7 @@ type UserSorting = '+follower' | '-follower' | '+createdAt' | '-createdAt' | '+u
 // src/api.types.ts:20:25 - (ae-forgotten-export) The symbol "NoParams" needs to be exported by the entry point index.d.ts
 // src/api.types.ts:638:18 - (ae-forgotten-export) The symbol "ShowUserReq" needs to be exported by the entry point index.d.ts
 // src/entities.ts:119:2 - (ae-forgotten-export) The symbol "notificationTypes_2" needs to be exported by the entry point index.d.ts
-// src/entities.ts:636:2 - (ae-forgotten-export) The symbol "ModerationLogPayloads" needs to be exported by the entry point index.d.ts
+// src/entities.ts:637:2 - (ae-forgotten-export) The symbol "ModerationLogPayloads" needs to be exported by the entry point index.d.ts
 // src/streaming.types.ts:33:4 - (ae-forgotten-export) The symbol "FIXME" needs to be exported by the entry point index.d.ts
 
 // (No @packageDocumentation comment for this package)
diff --git a/packages/misskey-js/src/entities.ts b/packages/misskey-js/src/entities.ts
index 7f142439f..cc512989b 100644
--- a/packages/misskey-js/src/entities.ts
+++ b/packages/misskey-js/src/entities.ts
@@ -476,6 +476,7 @@ export type Announcement = {
 	needConfirmationToRead: boolean;
 	closeDuration: number;
 	displayOrder: number;
+	silence: boolean;
 	forYou: boolean;
 	isRead?: boolean;
 };