diff --git a/src/util/cache/EntityCache.ts b/src/util/cache/EntityCache.ts
new file mode 100644
index 00000000..9135fef3
--- /dev/null
+++ b/src/util/cache/EntityCache.ts
@@ -0,0 +1,160 @@
+/*
+ Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
+ Copyright (C) 2023 Fosscord and Fosscord Contributors
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+*/
+/* eslint-disable */
+import {
+ DataSource,
+ FindOneOptions,
+ EntityNotFoundError,
+ FindOptionsWhere,
+} from "typeorm";
+import { QueryDeepPartialEntity } from "typeorm/query-builder/QueryPartialEntity";
+import { BaseClassWithId } from "../entities/BaseClass";
+import { Config, getDatabase } from "../util";
+import { CacheManager } from "./Cache";
+
+function getObjectKeysAsArray(obj?: Record<string, any>) {
+ if (!obj) return [];
+ if (Array.isArray(obj)) return obj;
+ return Object.keys(obj);
+}
+
+export type ThisType<T> = {
+ new (): T;
+} & typeof BaseEntityCache;
+
+interface BaseEntityCache {
+ constructor: typeof BaseEntityCache;
+}
+
+// @ts-ignore
+class BaseEntityCache extends BaseClassWithId {
+ static cache: CacheManager;
+ static cacheEnabled: boolean;
+
+ public get metadata() {
+ return getDatabase()?.getMetadata(this.constructor)!;
+ }
+
+ static useDataSource(dataSource: DataSource | null) {
+ super.useDataSource(dataSource);
+ this.cacheEnabled = Config.get().cache.enabled ?? true;
+ if (Config.get().cache.redis) return; // TODO: Redis cache
+ if (!this.cacheEnabled) return;
+ this.cache = new CacheManager();
+ }
+
+ static async findOne<T extends BaseEntityCache>(
+ this: ThisType<T>,
+ options: FindOneOptions<T>,
+ ) {
+ // @ts-ignore
+ if (!this.cacheEnabled) return super.findOne(options);
+ let select = getObjectKeysAsArray(options.select);
+
+ if (!select.length) {
+ // get all columns that are marked as select
+ getDatabase()
+ ?.getMetadata(this)
+ .columns.forEach((x) => {
+ if (!x.isSelect) return;
+ select.push(x.propertyName);
+ });
+ }
+ if (options.relations) {
+ select.push(...getObjectKeysAsArray(options.relations));
+ }
+
+ const cacheResult = this.cache.find(options.where as never, select);
+ if (cacheResult) {
+ const hasAllProps = select.every((key) => {
+ if (key.includes(".")) return true; // @ts-ignore
+ return cacheResult[key] !== undefined;
+ });
+ // console.log(`[Cache] get ${cacheResult.id} from ${cacheResult.constructor.name}`,);
+ if (hasAllProps) return cacheResult;
+ }
+
+ // @ts-ignore
+ const result = await super.findOne<T>(options);
+ if (!result) return null;
+
+ this.cache.insert(result as any);
+
+ return result;
+ }
+
+ static async findOneOrFail<T extends BaseEntityCache>(
+ this: ThisType<T>,
+ options: FindOneOptions<T>,
+ ) {
+ const result = await this.findOne<T>(options);
+ if (!result) throw new EntityNotFoundError(this, options);
+ return result;
+ }
+
+ save() {
+ if (this.constructor.cacheEnabled) this.constructor.cache.insert(this);
+ return super.save();
+ }
+
+ remove() {
+ if (this.constructor.cacheEnabled)
+ this.constructor.cache.delete(this.id);
+ return super.remove();
+ }
+
+ static async update<T extends BaseEntityCache>(
+ this: ThisType<T>,
+ criteria: FindOptionsWhere<T>,
+ partialEntity: QueryDeepPartialEntity<T>,
+ ) {
+ // @ts-ignore
+ const result = super.update<T>(criteria, partialEntity);
+ if (!this.cacheEnabled) return result;
+
+ const entities = this.cache.filter(criteria as never);
+ for (const entity of entities) {
+ // @ts-ignore
+ partialEntity.id = entity.id;
+ this.cache.insert(partialEntity as never);
+ }
+
+ return result;
+ }
+
+ static async delete<T extends BaseEntityCache>(
+ this: ThisType<T>,
+ criteria: FindOptionsWhere<T>,
+ ) {
+ // @ts-ignore
+ const result = super.delete<T>(criteria);
+ if (!this.cacheEnabled) return result;
+
+ const entities = this.cache.filter(criteria as never);
+ for (const entity of entities) {
+ this.cache.delete(entity.id);
+ }
+
+ return result;
+ }
+}
+
+// needed, because typescript can't infer the type of the static methods with generics
+const EntityCache = BaseEntityCache as unknown as typeof BaseClassWithId;
+
+export { EntityCache };
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