refactor: migrate to typeorm 3.0 (#8443)

* wip

* wip

* wip

* Update following.ts

* wip

* wip

* wip

* Update resolve-user.ts

* maxQueryExecutionTime

* wip

* wip

packages/backend/src/misc/fetch-meta.ts

@@ -1,12 +1,12 @@
+import { db } from '@/db/postgre.js';
 import { Meta } from '@/models/entities/meta.js';
-import { getConnection } from 'typeorm';
 
 let cache: Meta;
 
 export async function fetchMeta(noCache = false): Promise<Meta> {
 	if (!noCache && cache) return cache;
 
-	return await getConnection().transaction(async transactionalEntityManager => {
+	return await db.transaction(async transactionalEntityManager => {
 		// 過去のバグでレコードが複数出来てしまっている可能性があるので新しいIDを優先する
 		const meta = await transactionalEntityManager.findOne(Meta, {
 			order: {