First unchecked draft for tags

src/repositories/TagRepository.ts

@@ -0,0 +1,24 @@
+import { AbstractRepository } from "./AbstractRepository.js";
+import { TagEntity } from "../entities/TagEntity.js";
+
+/**
+ * Repository for TagEntity.
+ * The AbstractRepository already provides findById, findAll, create, update,
+ * and delete. Tag-specific queries can be added here as needed.
+ */
+export class TagRepository extends AbstractRepository<TagEntity> {
+    constructor() {
+        super(TagEntity);
+    }
+
+    /**
+     * Looks up a tag by its description (case-insensitive).
+     * Useful for detecting duplicates before creating a new tag.
+     */
+    async findByDescription(description: string): Promise<TagEntity | null> {
+        return this.repo
+            .createQueryBuilder("tag")
+            .where("LOWER(tag.description) = LOWER(:description)", { description })
+            .getOne();
+    }
+}