diff --git a/src/modules/content/repositories/category.repository.ts b/src/modules/content/repositories/category.repository.ts
new file mode 100644
index 0000000..55b1c1c
--- /dev/null
+++ b/src/modules/content/repositories/category.repository.ts
@@ -0,0 +1,114 @@
+import { pick, unset } from 'lodash';
+import { FindOptionsUtils, FindTreeOptions, TreeRepository, TreeRepositoryUtils } from 'typeorm';
+
+import { CategoryEntity } from '@/modules/content/entities/CategoryEntity';
+import { CustomRepository } from '@/modules/database/decorators/repository.decorator';
+
+@CustomRepository(CategoryEntity)
+export class CategoryRepository extends TreeRepository<CategoryEntity> {
+    buildBaseQB() {
+        return this.createQueryBuilder('category').leftJoinAndSelect('category.parent', 'parent');
+    }
+
+    async findTrees(options?: FindTreeOptions) {
+        const roots = await this.findRoots(options);
+        await Promise.all(roots.map((root) => this.findDescendantsTree(root, options)));
+        return roots;
+    }
+
+    findRoots(options?: FindTreeOptions): Promise<CategoryEntity[]> {
+        const escape = (val: string) => this.manager.connection.driver.escape(val);
+        const joinColumn = this.metadata.treeParentRelation!.joinColumns[0];
+        const parentPropertyName = joinColumn.givenDatabaseName || joinColumn.databaseName;
+        const qb = this.buildBaseQB().orderBy('category.customOrder', 'ASC');
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, options);
+        return qb.where(`${escape('category')}.${escape(parentPropertyName)} IS NULL`).getMany();
+    }
+
+    findDescendants(entity: CategoryEntity, options?: FindTreeOptions): Promise<CategoryEntity[]> {
+        const qb = this.createDescendantsQueryBuilder('category', 'treeClosure', entity);
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, options);
+        qb.orderBy('category.customOrder', 'ASC');
+        return qb.getMany();
+    }
+
+    findAncestors(entity: CategoryEntity, options?: FindTreeOptions): Promise<CategoryEntity[]> {
+        const qb = this.createAncestorsQueryBuilder('category', 'treeClosure', entity);
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, options);
+        qb.orderBy('category.customOrder', 'ASC');
+        return qb.getMany();
+    }
+
+    async findDescendantsTree(entity: CategoryEntity, options?: FindTreeOptions) {
+        const qb = this.createDescendantsQueryBuilder('category', 'treeClosure', entity)
+            .leftJoinAndSelect('category.parent', 'parent')
+            .orderBy('category.customOrder', 'ASC');
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, pick(options, ['relations', 'depth']));
+        const entities = await qb.getRawAndEntities();
+        const relationMaps = TreeRepositoryUtils.createRelationMaps(
+            this.manager,
+            this.metadata,
+            'category',
+            entities.raw,
+        );
+        TreeRepositoryUtils.buildChildrenEntityTree(
+            this.metadata,
+            entity,
+            entities.entities,
+            relationMaps,
+            { depth: -1, ...pick(options, ['relations']) },
+        );
+        return entity;
+    }
+
+    async findAncestorsTree(
+        entity: CategoryEntity,
+        options?: FindTreeOptions,
+    ): Promise<CategoryEntity> {
+        const qb = this.createAncestorsQueryBuilder('category', 'treeClosure', entity)
+            .leftJoinAndSelect('category.parent', 'parent')
+            .orderBy('category.customOrder', 'ASC');
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, options);
+        const entities = await qb.getRawAndEntities();
+        const relationMaps = TreeRepositoryUtils.createRelationMaps(
+            this.manager,
+            this.metadata,
+            'category',
+            entities.raw,
+        );
+        TreeRepositoryUtils.buildParentEntityTree(
+            this.metadata,
+            entity,
+            entities.entities,
+            relationMaps,
+        );
+        return entity;
+    }
+
+    async countDescendants(entity: CategoryEntity): Promise<number> {
+        const qb = this.createDescendantsQueryBuilder('category', 'treeClosure', entity);
+        return qb.getCount();
+    }
+
+    async countAncestors(entity: CategoryEntity) {
+        const qb = this.createAncestorsQueryBuilder('category', 'treeClosure', entity);
+        return qb.getCount();
+    }
+
+    async toFlatTrees(
+        trees: CategoryEntity[],
+        depth = 0,
+        parent: CategoryEntity | null = null,
+    ): Promise<CategoryEntity[]> {
+        const data: Omit<CategoryEntity, 'children'>[] = [];
+        for (const item of trees) {
+            item.depth = depth;
+            item.parent = parent;
+            const { children } = item;
+            unset(item, 'children');
+            data.push(item);
+            data.push(...(await this.toFlatTrees(children, depth + 1, item)));
+        }
+        return data as CategoryEntity[];
+    }
+}
diff --git a/src/modules/content/repositories/comment.repository.ts b/src/modules/content/repositories/comment.repository.ts
new file mode 100644
index 0000000..4e1acac
--- /dev/null
+++ b/src/modules/content/repositories/comment.repository.ts
@@ -0,0 +1,95 @@
+import { pick, unset } from 'lodash';
+import {
+    FindOptionsUtils,
+    FindTreeOptions,
+    SelectQueryBuilder,
+    TreeRepository,
+    TreeRepositoryUtils,
+} from 'typeorm';
+
+import { CommentEntity } from '@/modules/content/entities/comment.entity';
+import { CustomRepository } from '@/modules/database/decorators/repository.decorator';
+
+type FindCommentTreeOptions = FindTreeOptions & {
+    addQuery?: (query: SelectQueryBuilder<CommentEntity>) => SelectQueryBuilder<CommentEntity>;
+};
+@CustomRepository(CommentEntity)
+export class CommentRepository extends TreeRepository<CommentEntity> {
+    buildBaseQB(qb: SelectQueryBuilder<CommentEntity>): SelectQueryBuilder<CommentEntity> {
+        return qb
+            .leftJoinAndSelect(`comment.parent`, 'parent')
+            .leftJoinAndSelect(`comment.post`, `post`)
+            .orderBy('comment.createdAt', 'DESC');
+    }
+
+    async findTrees(options: FindCommentTreeOptions): Promise<CommentEntity[]> {
+        options.relations = ['parent', 'children'];
+        const roots = await this.findRoots(options);
+        await Promise.all(roots.map((root) => this.findDescendantsTree(root, options)));
+        return roots;
+    }
+
+    findRoots(options?: FindCommentTreeOptions): Promise<CommentEntity[]> {
+        const { addQuery, ...rest } = options;
+        const escape = (val: string) => this.manager.connection.driver.escape(val);
+        const joinColumn = this.metadata.treeParentRelation!.joinColumns[0];
+        const parentPropertyName = joinColumn.givenDatabaseName || joinColumn.databaseName;
+
+        let qb = this.buildBaseQB(this.createQueryBuilder('comment'));
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, rest);
+        qb.where(`${escape('comment')}.${escape(parentPropertyName)} IS NULL`);
+        qb = addQuery ? addQuery(qb) : qb;
+        return qb.getMany();
+    }
+
+    createDtsQueryBuilder(
+        closureTable: string,
+        entity: CommentEntity,
+        options: FindCommentTreeOptions = {},
+    ): SelectQueryBuilder<CommentEntity> {
+        const { addQuery } = options;
+        const qb = this.buildBaseQB(
+            super.createDescendantsQueryBuilder('comment', closureTable, entity),
+        );
+        return addQuery ? addQuery(qb) : qb;
+    }
+
+    async findDescendantsTree(
+        entity: CommentEntity,
+        options: FindCommentTreeOptions = {},
+    ): Promise<CommentEntity> {
+        const qb: SelectQueryBuilder<CommentEntity> = this.createDtsQueryBuilder(
+            'treeClosure',
+            entity,
+            options,
+        );
+        FindOptionsUtils.applyOptionsToTreeQueryBuilder(qb, pick(options, ['relations', 'depth']));
+        const entities = await qb.getRawAndEntities();
+        const relationMaps = TreeRepositoryUtils.createRelationMaps(
+            this.manager,
+            this.metadata,
+            'comment',
+            entities.raw,
+        );
+        TreeRepositoryUtils.buildChildrenEntityTree(
+            this.metadata,
+            entity,
+            entities.entities,
+            relationMaps,
+            { depth: -1, ...pick(options, ['relations']) },
+        );
+        return entity;
+    }
+
+    async toFlatTrees(trees: CommentEntity[], depth = 0): Promise<CommentEntity[]> {
+        const data: Omit<CommentEntity, 'children'>[] = [];
+        for (const item of trees) {
+            item.depth = depth;
+            const { children } = item;
+            unset(item, 'children');
+            data.push(item);
+            data.push(...(await this.toFlatTrees(children, depth + 1)));
+        }
+        return data as CommentEntity[];
+    }
+}