diff --git a/packages/backend/migration/1745378064470-composite-note-index.js b/packages/backend/migration/1745378064470-composite-note-index.js
index 12108a6b3c..576bf7d19a 100644
--- a/packages/backend/migration/1745378064470-composite-note-index.js
+++ b/packages/backend/migration/1745378064470-composite-note-index.js
@@ -3,14 +3,14 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { isConcurrentIndexMigrationEnabled } from "./js/migration-config.js";
+const isConcurrentIndexMigrationEnabled = process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
 
 export class CompositeNoteIndex1745378064470 {
 	name = 'CompositeNoteIndex1745378064470';
-	transaction = isConcurrentIndexMigrationEnabled() ? false : undefined;
+	transaction = isConcurrentIndexMigrationEnabled ? false : undefined;
 
 	async up(queryRunner) {
-		const concurrently = isConcurrentIndexMigrationEnabled();
+		const concurrently = isConcurrentIndexMigrationEnabled;
 
 		if (concurrently) {
 			const hasValidIndex = await queryRunner.query(`SELECT indisvalid FROM pg_index INNER JOIN pg_class ON pg_index.indexrelid = pg_class.oid WHERE pg_class.relname = 'IDX_724b311e6f883751f261ebe378'`);
@@ -29,7 +29,7 @@ export class CompositeNoteIndex1745378064470 {
 	}
 
 	async down(queryRunner) {
-		const mayConcurrently = isConcurrentIndexMigrationEnabled() ? 'CONCURRENTLY' : '';
+		const mayConcurrently = isConcurrentIndexMigrationEnabled ? 'CONCURRENTLY' : '';
 		await queryRunner.query(`DROP INDEX IF EXISTS "IDX_724b311e6f883751f261ebe378"`);
 		await queryRunner.query(`CREATE INDEX ${mayConcurrently} "IDX_5b87d9d19127bd5d92026017a7" ON "note" ("userId")`);
 	}
diff --git a/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js b/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
index 3243f43b91..cb8bb33459 100644
--- a/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
+++ b/packages/backend/migration/1746949539915-migrateSomeConfigFileSettingsToMeta.js
@@ -3,17 +3,15 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import {loadConfig} from "./js/migration-config.js";
 
 export class MigrateSomeConfigFileSettingsToMeta1746949539915 {
     name = 'MigrateSomeConfigFileSettingsToMeta1746949539915'
 
     async up(queryRunner) {
-        const config = loadConfig();
         // $1 cannot be used in ALTER TABLE queries
-        await queryRunner.query(`ALTER TABLE "meta" ADD "proxyRemoteFiles" boolean NOT NULL DEFAULT ${config.proxyRemoteFiles}`);
-        await queryRunner.query(`ALTER TABLE "meta" ADD "signToActivityPubGet" boolean NOT NULL DEFAULT ${config.signToActivityPubGet}`);
-        await queryRunner.query(`ALTER TABLE "meta" ADD "allowExternalApRedirect" boolean NOT NULL DEFAULT ${!config.disallowExternalApRedirect}`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "proxyRemoteFiles" boolean NOT NULL DEFAULT TRUE`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "signToActivityPubGet" boolean NOT NULL DEFAULT TRUE`);
+        await queryRunner.query(`ALTER TABLE "meta" ADD "allowExternalApRedirect" boolean NOT NULL DEFAULT TRUE`);
     }
 
     async down(queryRunner) {
diff --git a/packages/backend/migration/js/migration-config.js b/packages/backend/migration/js/migration-config.js
deleted file mode 100644
index bc7bb1a140..0000000000
--- a/packages/backend/migration/js/migration-config.js
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import { compiledConfigFilePath } from '../../built/config.js';
-import fs from "node:fs";
-
-export function isConcurrentIndexMigrationEnabled() {
-	return process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
-}
-
-let loadedConfigCache = undefined;
-
-function loadConfigInternal() {
-	const config = JSON.parse(fs.readFileSync(compiledConfigFilePath, 'utf-8'));
-
-	return {
-		disallowExternalApRedirect: Boolean(config.disallowExternalApRedirect ?? false),
-		proxyRemoteFiles: Boolean(config.proxyRemoteFiles ?? false),
-		signToActivityPubGet: Boolean(config.signToActivityPubGet ?? true),
-	}
-}
-
-export function loadConfig() {
-	if (loadedConfigCache === undefined) {
-		loadedConfigCache = loadConfigInternal();
-	}
-	return loadedConfigCache;
-}
diff --git a/packages/backend/ormconfig.js b/packages/backend/ormconfig.js
index f979c36ad7..dabc0893f4 100644
--- a/packages/backend/ormconfig.js
+++ b/packages/backend/ormconfig.js
@@ -1,7 +1,8 @@
 import { DataSource } from 'typeorm';
 import { loadConfig } from './built/config.js';
 import { entities } from './built/postgres.js';
-import { isConcurrentIndexMigrationEnabled } from "./migration/js/migration-config.js";
+
+const isConcurrentIndexMigrationEnabled = process.env.MISSKEY_MIGRATION_CREATE_INDEX_CONCURRENTLY === '1';
 
 const config = loadConfig();
 
@@ -15,5 +16,5 @@ export default new DataSource({
 	extra: config.db.extra,
 	entities: entities,
 	migrations: ['migration/*.js'],
-	migrationsTransactionMode: isConcurrentIndexMigrationEnabled() ? 'each' : 'all',
+	migrationsTransactionMode: isConcurrentIndexMigrationEnabled ? 'each' : 'all',
 });