Greatly improved server code base

src/repositories/characterHairRepository.ts

@@ -6,37 +6,37 @@ class CharacterHairRepository extends BaseRepository {
   async getFirst() {
     try {
       const repository = this.em.getRepository(CharacterHair)
-      return await repository.findOne({ id: { $exists: true } }, { populate: ['*'] })
+      return await repository.findOne({ id: { $exists: true } })
     } catch (error: any) {
       appLogger.error(`Failed to get first character hair: ${error instanceof Error ? error.message : String(error)}`)
       return null
     }
   }
 
-  async getAll() {
+  async getAll(): Promise<CharacterHair[]> {
     try {
       const repository = this.em.getRepository(CharacterHair)
-      return await repository.findAll({ populate: ['*'] })
+      return await repository.findAll()
     } catch (error: any) {
       appLogger.error(`Failed to get all character hair: ${error instanceof Error ? error.message : String(error)}`)
-      return null
+      return []
     }
   }
 
-  async getAllSelectable() {
+  async getAllSelectable(): Promise<CharacterHair[]> {
     try {
       const repository = this.em.getRepository(CharacterHair)
-      return await repository.find({ isSelectable: true }, { populate: ['*'] })
+      return await repository.find({ isSelectable: true })
     } catch (error: any) {
       appLogger.error(`Failed to get selectable character hair: ${error instanceof Error ? error.message : String(error)}`)
-      return null
+      return []
     }
   }
 
-  async getById(id: number) {
+  async getById(id: number): Promise<CharacterHair | null> {
     try {
       const repository = this.em.getRepository(CharacterHair)
-      return await repository.findOne({ id }, { populate: ['*'] })
+      return await repository.findOne({ id })
     } catch (error: any) {
       appLogger.error(`Failed to get character hair by ID: ${error instanceof Error ? error.message : String(error)}`)
       return null