diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 5c90718..af155e6 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -52,7 +52,7 @@ jobs:
         run: |
           sudo apt-get update && sudo apt-get install -y sqlite3
           sqlite3 test.db "CREATE TABLE item (id INTEGER PRIMARY KEY, barcode TEXT, name TEXT, price INTEGER);
-                           CREATE TABLE sale (id INTEGER PRIMARY KEY, storeId INTEGER, staffId INTEGER, quantity INTEGER, amount INTEGER, deposit INTEGER, createdAt TEXT);
+                           CREATE TABLE sale (id INTEGER PRIMARY KEY, storeId INTEGER, quantity INTEGER, amount INTEGER, deposit INTEGER, createdAt TEXT);
                            CREATE TABLE sale_detail (id INTEGER PRIMARY KEY, saleId INTEGER, itemId INTEGER, price INTEGER, quantity INTEGER);
                            INSERT INTO item VALUES (1, 'test-barcode', 'Test Item', 100);
                            INSERT INTO item VALUES (2, 'test-barcode-2', 'Test Item 2', 200);"
diff --git a/api.yaml b/api.yaml
index b1c63e7..b03ac49 100644
--- a/api.yaml
+++ b/api.yaml
@@ -18,14 +18,10 @@ tags:
     description: 商品管理
   - name: Sales
     description: 売上管理
-  - name: Staff
-    description: スタッフ管理
   - name: Stores
     description: 店舗管理
   - name: Settings
     description: 設定管理
-  - name: Users
-    description: ユーザー管理
 
 paths:
   # Items
@@ -269,9 +265,6 @@ paths:
                   change:
                     type: integer
                     description: おつり
-                  staffId:
-                    type: integer
-                    description: スタッフID
                   storeId:
                     type: integer
                     description: 店舗ID
@@ -335,113 +328,6 @@ paths:
                   isValid:
                     type: boolean
 
-  # Staff
-  /api/staff:
-    get:
-      tags:
-        - Staff
-      summary: スタッフ一覧取得
-      description: 全スタッフを取得します
-      operationId: getAllStaff
-      responses:
-        '200':
-          description: Success
-          content:
-            application/json:
-              schema:
-                type: array
-                items:
-                  $ref: '#/components/schemas/StaffEntity'
-
-    post:
-      tags:
-        - Staff
-      summary: スタッフ登録
-      description: 新しいスタッフを登録します
-      operationId: createStaff
-      requestBody:
-        required: true
-        content:
-          application/json:
-            schema:
-              $ref: '#/components/schemas/CreateStaffRequest'
-      responses:
-        '201':
-          description: Created
-          content:
-            application/json:
-              schema:
-                $ref: '#/components/schemas/StaffEntity'
-
-  /api/staff/{barcode}:
-    get:
-      tags:
-        - Staff
-      summary: スタッフ取得
-      description: バーコードからスタッフを取得します
-      operationId: getStaffByBarcode
-      parameters:
-        - name: barcode
-          in: path
-          required: true
-          schema:
-            type: string
-      responses:
-        '200':
-          description: Success
-          content:
-            application/json:
-              schema:
-                $ref: '#/components/schemas/StaffEntity'
-        '404':
-          description: Staff not found
-
-    put:
-      tags:
-        - Staff
-      summary: スタッフ更新
-      description: スタッフ情報を更新します
-      operationId: updateStaff
-      parameters:
-        - name: barcode
-          in: path
-          required: true
-          schema:
-            type: string
-      requestBody:
-        required: true
-        content:
-          application/json:
-            schema:
-              $ref: '#/components/schemas/UpdateStaffRequest'
-      responses:
-        '200':
-          description: Success
-          content:
-            application/json:
-              schema:
-                $ref: '#/components/schemas/StaffEntity'
-        '404':
-          description: Staff not found
-
-    delete:
-      tags:
-        - Staff
-      summary: スタッフ削除
-      description: スタッフを削除します
-      operationId: deleteStaff
-      parameters:
-        - name: barcode
-          in: path
-          required: true
-          schema:
-            type: string
-      responses:
-        '204':
-          description: No Content
-        '404':
-          description: Staff not found
-
   # Stores
   /api/stores:
     get:
@@ -797,46 +683,6 @@ paths:
                   message:
                     type: string
 
-  # Users
-  /api/users:
-    get:
-      tags:
-        - Users
-      summary: ユーザー一覧取得
-      description: 全ユーザーを取得します
-      operationId: getAllUsers
-      responses:
-        '200':
-          description: Success
-          content:
-            application/json:
-              schema:
-                type: array
-                items:
-                  $ref: '#/components/schemas/StaffEntity'
-
-  /api/users/{barcode}:
-    get:
-      tags:
-        - Users
-      summary: ユーザー取得
-      description: バーコードからユーザーを取得します
-      operationId: getUserByBarcode
-      parameters:
-        - name: barcode
-          in: path
-          required: true
-          schema:
-            type: string
-      responses:
-        '200':
-          description: Success
-          content:
-            application/json:
-              schema:
-                $ref: '#/components/schemas/StaffEntity'
-        '404':
-          description: User not found
 
 components:
   schemas:
@@ -896,12 +742,6 @@ components:
         storeName:
           type: string
           description: 店舗名
-        staffId:
-          type: string
-          description: スタッフID
-        staffName:
-          type: string
-          description: スタッフ名
         totalAmount:
           type: integer
           description: 合計金額（リバー）
@@ -924,8 +764,6 @@ components:
         - id
         - storeId
         - storeName
-        - staffId
-        - staffName
         - totalAmount
         - deposit
         - change
@@ -966,10 +804,6 @@ components:
         storeId:
           type: integer
           description: 店舗ID
-        staffBarcode:
-          type: string
-          nullable: true
-          description: スタッフバーコード（オプショナル）
         itemIds:
           type: string
           description: 商品IDのカンマ区切り文字列（例："1,2,3"）
@@ -983,43 +817,6 @@ components:
         - itemIds
         - deposit
 
-    StaffEntity:
-      type: object
-      properties:
-        barcode:
-          type: string
-          example: "STAFF001"
-        name:
-          type: string
-          example: "田中太郎"
-      required:
-        - barcode
-        - name
-
-    CreateStaffRequest:
-      type: object
-      properties:
-        barcode:
-          type: string
-          minLength: 1
-          maxLength: 50
-        name:
-          type: string
-          minLength: 1
-          maxLength: 100
-      required:
-        - barcode
-        - name
-
-    UpdateStaffRequest:
-      type: object
-      properties:
-        name:
-          type: string
-          minLength: 1
-          maxLength: 100
-      required:
-        - name
 
     StoreEntity:
       type: object
@@ -1093,4 +890,4 @@ components:
 
 # セキュリティは現在未実装のため、コメントアウト
 # security:
-#   - bearerAuth: []
\ No newline at end of file
+#   - bearerAuth: []
diff --git a/src/main/kotlin/info/nukoneko/kidspos/common/Constants.kt b/src/main/kotlin/info/nukoneko/kidspos/common/Constants.kt
index e3adef2..3d27692 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/common/Constants.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/common/Constants.kt
@@ -10,6 +10,17 @@ object Constants {
     object Barcode {
         const val SUFFIX_LENGTH = 3
         const val MIN_LENGTH = 4
+        const val TOTAL_LENGTH = 10
+        const val ID_LENGTH = 6
+
+        // バーコード種別コード
+        const val TYPE_STAFF = "00"
+        const val TYPE_ITEM = "01"
+        const val TYPE_SALE = "02"
+
+        // バーコードの開始・終了記号
+        const val PREFIX = "A"
+        const val SUFFIX = "A"
     }
 
     /**
@@ -25,7 +36,11 @@ object Constants {
      */
     object Validation {
         const val NAME_MAX_LENGTH = 255
-        const val BARCODE_PATTERN = "^[0-9]{4,}$"
+
+        // 独自バーコードフォーマット: A + 種別(2桁) + ID(6桁) + A
+        // 種別: 00(STAFF), 01(ITEM), 02(SALE)
+        // 例: A01000001A (商品ID:1)
+        const val BARCODE_PATTERN = "^A(00|01|02)\\d{6}A$"
         const val MAX_PRICE = 1000000
         const val MAX_QUANTITY = 9999
     }
diff --git a/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptDetail.kt b/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptDetail.kt
index c3efc5f..7755fb6 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptDetail.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptDetail.kt
@@ -6,7 +6,6 @@ import java.util.*
 data class ReceiptDetail(
     val items: List<ItemEntity>,
     val storeName: String?,
-    val staffName: String?,
     val deposit: Int,
     val transactionId: String?,
     val createdAt: Date,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptPrinter.kt b/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptPrinter.kt
index 321dc9a..1ba91b9 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptPrinter.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/receipt/ReceiptPrinter.kt
@@ -22,14 +22,11 @@ class ReceiptPrinter(
         command.writeTextLine(dateFormat.format(detail.createdAt))
         command.newLine()
 
-        // 店舗名・担当者
+        // 店舗名
         command.setGravity(PrintCommand.Direction.LEFT)
         if (!detail.storeName.isNullOrEmpty()) {
             command.writeTextLine("店舗名：${detail.storeName.toAllEm()}")
         }
-        if (!detail.staffName.isNullOrEmpty()) {
-            command.writeTextLine("担　当：${detail.staffName.toAllEm()}")
-        }
         command.drawLine()
 
         command.setGravity(PrintCommand.Direction.CENTER)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/ItemApiController.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/ItemApiController.kt
index 5b44768..d42b6e0 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/ItemApiController.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/ItemApiController.kt
@@ -230,7 +230,7 @@ class ItemApiController {
         val headers =
             HttpHeaders().apply {
                 contentType = MediaType.APPLICATION_PDF
-                setContentDispositionFormData("inline", "barcodes.pdf")
+                setContentDispositionFormData("attachment", "barcodes.pdf")
             }
 
         logger.info("Barcode PDF generated successfully with {} items", items.size)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiController.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiController.kt
index 8281ed2..a02dc14 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiController.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiController.kt
@@ -45,17 +45,15 @@ class SaleApiController(
             val saleBean =
                 SaleBean(
                     storeId = request.storeId,
-                    staffBarcode = request.staffBarcode,
                     itemIds = request.itemIds,
                     deposit = request.deposit,
                 )
             when (val result = saleProcessingService.processSaleWithValidation(saleBean, items)) {
                 is SaleResult.Success -> {
-                    // Print receipt (staffBarcode is now nullable)
+                    // Print receipt
                     receiptService.printReceipt(
                         request.storeId,
                         items,
-                        request.staffBarcode ?: "",
                         request.deposit,
                     )
 
@@ -67,7 +65,6 @@ class SaleApiController(
                             "quantity" to sale.quantity,
                             "deposit" to request.deposit,
                             "change" to (request.deposit - sale.amount),
-                            "staffId" to sale.staffId,
                             "storeId" to sale.storeId,
                         )
                     logger.info("Sale created successfully: ID={}", sale.id)
@@ -108,11 +105,10 @@ class SaleApiController(
             // Process the sale
             when (val result = saleProcessingService.processSaleWithValidation(saleBean, items)) {
                 is SaleResult.Success -> {
-                    // Print receipt (staffBarcode is now nullable)
+                    // Print receipt
                     receiptService.printReceipt(
                         saleBean.storeId,
                         items,
-                        saleBean.staffBarcode ?: "",
                         saleBean.deposit,
                     )
 
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiController.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiController.kt
deleted file mode 100644
index 5e32299..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiController.kt
+++ /dev/null
@@ -1,75 +0,0 @@
-package info.nukoneko.kidspos.server.controller.api
-
-import info.nukoneko.kidspos.server.controller.dto.request.CreateStaffRequest
-import info.nukoneko.kidspos.server.domain.exception.ResourceNotFoundException
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import info.nukoneko.kidspos.server.service.StaffService
-import jakarta.validation.Valid
-import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.http.HttpStatus
-import org.springframework.http.ResponseEntity
-import org.springframework.web.bind.annotation.*
-
-/**
- * スタッフAPIコントローラー
- *
- * スタッフ情報の取得と管理を行うREST APIエンドポイントを提供
- */
-@RestController
-@RequestMapping("/api/staff")
-class StaffApiController {
-    @Autowired
-    private lateinit var service: StaffService
-
-    @GetMapping("/{barcode}")
-    fun getStaff(
-        @PathVariable barcode: String,
-    ): ResponseEntity<StaffEntity> {
-        val staff =
-            service.findStaff(barcode)
-                ?: throw ResourceNotFoundException("Staff with barcode $barcode not found")
-        return ResponseEntity.ok(staff)
-    }
-
-    @GetMapping
-    fun getAllStaff(): ResponseEntity<List<StaffEntity>> = ResponseEntity.ok(service.findAll())
-
-    @PostMapping
-    fun createStaff(
-        @Valid @RequestBody request: CreateStaffRequest,
-    ): ResponseEntity<StaffEntity> {
-        val staff =
-            StaffEntity(
-                barcode = request.barcode,
-                name = request.name,
-            )
-        val savedStaff = service.save(staff)
-        return ResponseEntity.status(HttpStatus.CREATED).body(savedStaff)
-    }
-
-    @PutMapping("/{barcode}")
-    fun updateStaff(
-        @PathVariable barcode: String,
-        @Valid @RequestBody request: CreateStaffRequest,
-    ): ResponseEntity<StaffEntity> {
-        val existingStaff =
-            service.findStaff(barcode)
-                ?: throw ResourceNotFoundException("Staff with barcode $barcode not found")
-
-        val updatedStaff = existingStaff.copy(name = request.name)
-        val savedStaff = service.save(updatedStaff)
-        return ResponseEntity.ok(savedStaff)
-    }
-
-    @DeleteMapping("/{barcode}")
-    fun deleteStaff(
-        @PathVariable barcode: String,
-    ): ResponseEntity<Void> {
-        val existingStaff =
-            service.findStaff(barcode)
-                ?: throw ResourceNotFoundException("Staff with barcode $barcode not found")
-
-        service.delete(existingStaff)
-        return ResponseEntity.noContent().build()
-    }
-}
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/UserApiController.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/UserApiController.kt
deleted file mode 100644
index dc28417..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/UserApiController.kt
+++ /dev/null
@@ -1,87 +0,0 @@
-package info.nukoneko.kidspos.server.controller.api
-
-import info.nukoneko.kidspos.server.domain.exception.DuplicateResourceException
-import info.nukoneko.kidspos.server.domain.exception.ResourceNotFoundException
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import info.nukoneko.kidspos.server.service.StaffService
-import jakarta.validation.Valid
-import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.http.HttpStatus
-import org.springframework.http.ResponseEntity
-import org.springframework.web.bind.annotation.*
-
-/**
- * ユーザーAPIコントローラー
- *
- * ユーザー（スタッフ）情報の取得と管理を行うREST APIエンドポイントを提供
- */
-@RestController
-@RequestMapping("/api/users")
-class UserApiController {
-    @Autowired
-    private lateinit var staffService: StaffService
-
-    @GetMapping
-    fun getUsers(): ResponseEntity<List<StaffEntity>> = ResponseEntity.ok(staffService.findAll())
-
-    @GetMapping("/{barcode}")
-    fun getUser(
-        @PathVariable barcode: String,
-    ): ResponseEntity<StaffEntity> {
-        val user =
-            staffService.findStaff(barcode)
-                ?: throw ResourceNotFoundException("User with barcode $barcode not found")
-        return ResponseEntity.ok(user)
-    }
-
-    @PostMapping
-    fun createUser(
-        @Valid @RequestBody user: StaffEntity,
-    ): ResponseEntity<StaffEntity> {
-        // Validate required fields
-        if (user.barcode.isBlank()) {
-            throw IllegalArgumentException("Barcode is required")
-        }
-        if (user.name.isBlank()) {
-            throw IllegalArgumentException("Name is required")
-        }
-
-        // Check for duplicate barcode
-        if (staffService.findStaff(user.barcode) != null) {
-            throw DuplicateResourceException("User with barcode ${user.barcode} already exists")
-        }
-
-        val savedUser = staffService.save(user)
-        return ResponseEntity.status(HttpStatus.CREATED).body(savedUser)
-    }
-
-    @PutMapping("/{barcode}")
-    fun updateUser(
-        @PathVariable barcode: String,
-        @Valid @RequestBody user: StaffEntity,
-    ): ResponseEntity<StaffEntity> {
-        // Check if user exists
-        staffService.findStaff(barcode)
-            ?: throw ResourceNotFoundException("User with barcode $barcode not found")
-
-        // Validate required fields
-        if (user.name.isBlank()) {
-            throw IllegalArgumentException("Name is required")
-        }
-
-        val updatedUser = staffService.save(user.copy(barcode = barcode))
-        return ResponseEntity.ok(updatedUser)
-    }
-
-    @DeleteMapping("/{barcode}")
-    fun deleteUser(
-        @PathVariable barcode: String,
-    ): ResponseEntity<Void> {
-        // Check if user exists
-        staffService.findStaff(barcode)
-            ?: throw ResourceNotFoundException("User with barcode $barcode not found")
-
-        staffService.delete(barcode)
-        return ResponseEntity.noContent().build()
-    }
-}
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/SaleBean.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/SaleBean.kt
index edd1c0d..4af9f28 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/SaleBean.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/SaleBean.kt
@@ -2,7 +2,6 @@ package info.nukoneko.kidspos.server.controller.api.model
 
 data class SaleBean(
     val storeId: Int,
-    val staffBarcode: String,
     val deposit: Int,
     val itemIds: String,
 )
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/StaffBean.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/StaffBean.kt
deleted file mode 100644
index 4a9ce60..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/api/model/StaffBean.kt
+++ /dev/null
@@ -1,6 +0,0 @@
-package info.nukoneko.kidspos.server.controller.api.model
-
-data class StaffBean(
-    var barcode: String,
-    val name: String,
-)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateItemRequest.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateItemRequest.kt
index 81c1446..a5bba20 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateItemRequest.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateItemRequest.kt
@@ -15,9 +15,8 @@ data class CreateItemRequest(
     @field:NotBlank(message = "Item name is required")
     @field:Size(max = Constants.Validation.NAME_MAX_LENGTH)
     val name: String,
-    @field:NotBlank(message = "Barcode is required")
     @field:Pattern(regexp = Constants.Validation.BARCODE_PATTERN, message = "Invalid barcode format")
-    val barcode: String,
+    val barcode: String?,
     @field:Min(value = 0, message = "Price must be non-negative")
     val price: Int,
 )
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateSaleRequest.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateSaleRequest.kt
index 7ba393b..76f8595 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateSaleRequest.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateSaleRequest.kt
@@ -12,7 +12,6 @@ import jakarta.validation.constraints.NotNull
 data class CreateSaleRequest(
     @field:NotNull(message = "Store ID is required")
     val storeId: Int,
-    val staffBarcode: String? = null,
     @field:NotBlank(message = "Item IDs are required")
     val itemIds: String = "",
     @field:Min(value = 0, message = "Deposit must be non-negative")
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateStaffRequest.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateStaffRequest.kt
deleted file mode 100644
index 4f2a9d7..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/CreateStaffRequest.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-package info.nukoneko.kidspos.server.controller.dto.request
-
-import info.nukoneko.kidspos.common.Constants
-import jakarta.validation.constraints.*
-
-/**
- * スタッフ作成リクエストDTO
- *
- * 新規スタッフ作成時のリクエストデータを表現
- */
-data class CreateStaffRequest(
-    @field:NotBlank(message = "Staff name is required")
-    @field:Size(max = Constants.Validation.NAME_MAX_LENGTH, message = "Staff name is too long")
-    val name: String,
-    @field:NotBlank(message = "Barcode is required")
-    @field:Pattern(regexp = Constants.Validation.BARCODE_PATTERN, message = "Invalid barcode format")
-    val barcode: String,
-    @field:NotNull(message = "Store ID is required")
-    @field:Min(value = 1, message = "Store ID must be positive")
-    val storeId: Int,
-)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/ItemBean.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/ItemBean.kt
index 76789ea..2f4ebbe 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/ItemBean.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/ItemBean.kt
@@ -2,7 +2,7 @@ package info.nukoneko.kidspos.server.controller.dto.request
 
 data class ItemBean(
     val id: Int? = null,
-    val barcode: String,
+    val barcode: String?,
     val name: String,
     val price: Int,
 )
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/SaleBean.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/SaleBean.kt
index 5064b95..bb2d0ff 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/SaleBean.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/SaleBean.kt
@@ -2,7 +2,6 @@ package info.nukoneko.kidspos.server.controller.dto.request
 
 data class SaleBean(
     val storeId: Int,
-    val staffBarcode: String? = null,
     val deposit: Int,
     val itemIds: String,
 )
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/StaffBean.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/StaffBean.kt
deleted file mode 100644
index b310674..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/request/StaffBean.kt
+++ /dev/null
@@ -1,6 +0,0 @@
-package info.nukoneko.kidspos.server.controller.dto.request
-
-data class StaffBean(
-    var barcode: String,
-    val name: String,
-)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleReportData.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleReportData.kt
index 792b3f2..c529082 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleReportData.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleReportData.kt
@@ -6,8 +6,6 @@ data class SaleReportData(
     val saleId: Int,
     val storeId: Int,
     val storeName: String,
-    val staffId: Int,
-    val staffName: String,
     val quantity: Int,
     val amount: Int,
     val createdAt: Date,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleResponse.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleResponse.kt
index 55b4725..9809ea2 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleResponse.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/SaleResponse.kt
@@ -13,8 +13,6 @@ data class SaleResponse(
     val id: Int,
     val storeId: Int,
     val storeName: String,
-    val staffId: String,
-    val staffName: String,
     val totalAmount: Int,
     val deposit: Int,
     val change: Int,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/StaffResponse.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/StaffResponse.kt
deleted file mode 100644
index 61d52e1..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/dto/response/StaffResponse.kt
+++ /dev/null
@@ -1,21 +0,0 @@
-package info.nukoneko.kidspos.server.controller.dto.response
-
-import java.time.LocalDateTime
-
-/**
- * スタッフレスポンスDTO
- *
- * スタッフ情報のAPIレスポンスデータを表現
- */
-data class StaffResponse(
-    val id: String,
-    val name: String,
-    val barcode: String,
-    val storeId: Int,
-    val storeName: String? = null,
-    val createdAt: LocalDateTime? = null,
-    val updatedAt: LocalDateTime? = null,
-) {
-    val displayName: String
-        get() = "$name (ID: $id)"
-}
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/controller/front/StaffsController.kt b/src/main/kotlin/info/nukoneko/kidspos/server/controller/front/StaffsController.kt
deleted file mode 100644
index fca35b1..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/controller/front/StaffsController.kt
+++ /dev/null
@@ -1,22 +0,0 @@
-package info.nukoneko.kidspos.server.controller.front
-
-import info.nukoneko.kidspos.server.service.StaffService
-import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.stereotype.Controller
-import org.springframework.ui.Model
-import org.springframework.web.bind.annotation.GetMapping
-import org.springframework.web.bind.annotation.RequestMapping
-
-@Controller
-@RequestMapping("/staffs")
-class StaffsController {
-    @Autowired
-    private lateinit var staffService: StaffService
-
-    @GetMapping
-    fun index(model: Model): String {
-        model.addAttribute("title", javaClass.simpleName)
-        model.addAttribute("data", staffService.findAll())
-        return "staffs/index"
-    }
-}
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/entity/SaleEntity.kt b/src/main/kotlin/info/nukoneko/kidspos/server/entity/SaleEntity.kt
index 424f403..19cb4e7 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/entity/SaleEntity.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/entity/SaleEntity.kt
@@ -11,7 +11,6 @@ import java.util.*
  * 販売取引情報を表現するデータベースエンティティ
  * @property id 売上げID
  * @property storeId 店舗ID
- * @property staffId スタッフID
  * @property quantity 数量
  * @property amount 売上げ金額
  * @property deposit 預かり金
@@ -22,7 +21,6 @@ import java.util.*
 data class SaleEntity(
     @Id var id: Int = 0, // 売り上げID
     val storeId: Int, // 店舗ID
-    val staffId: Int, // スタッフID
     val quantity: Int, // 数量
     val amount: Int, // 売り上げ
     val deposit: Int,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/entity/StaffEntity.kt b/src/main/kotlin/info/nukoneko/kidspos/server/entity/StaffEntity.kt
deleted file mode 100644
index 874197b..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/entity/StaffEntity.kt
+++ /dev/null
@@ -1,23 +0,0 @@
-package info.nukoneko.kidspos.server.entity
-
-import jakarta.persistence.Entity
-import jakarta.persistence.Id
-import jakarta.persistence.Table
-import jakarta.validation.constraints.NotBlank
-
-/**
- * スタッフエンティティ
- *
- * 店舗スタッフ情報を表現するデータベースエンティティ
- * @property barcode スタッフのバーコードID
- * @property name スタッフ名
- */
-@Entity
-@Table(name = "staff")
-data class StaffEntity(
-    @Id
-    @field:NotBlank(message = "Barcode is required")
-    var barcode: String,
-    @field:NotBlank(message = "Name is required")
-    val name: String,
-)
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/repository/StaffRepository.kt b/src/main/kotlin/info/nukoneko/kidspos/server/repository/StaffRepository.kt
deleted file mode 100644
index 48d1472..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/repository/StaffRepository.kt
+++ /dev/null
@@ -1,13 +0,0 @@
-package info.nukoneko.kidspos.server.repository
-
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import org.springframework.data.jpa.repository.JpaRepository
-import org.springframework.stereotype.Repository
-
-/**
- * スタッフエンティティのリポジトリインターフェース
- *
- * スタッフ情報のCRUD操作を提供
- */
-@Repository
-interface StaffRepository : JpaRepository<StaffEntity, String>
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/ItemService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/ItemService.kt
index 627c6cd..24c61c1 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/ItemService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/ItemService.kt
@@ -1,5 +1,6 @@
 package info.nukoneko.kidspos.server.service
 
+import info.nukoneko.kidspos.common.Constants
 import info.nukoneko.kidspos.common.service.IdGenerationService
 import info.nukoneko.kidspos.server.config.CacheConfig
 import info.nukoneko.kidspos.server.controller.dto.request.ItemBean
@@ -81,9 +82,19 @@ class ItemService(
             } else {
                 idGenerationService.generateNextId(repository)
             }
-        val item = ItemEntity(generatedId, itemBean.barcode, itemBean.name, itemBean.price)
+
+        // バーコードが空の場合は自動生成（A + 種別コード01 + ID(6桁) + A）
+        val finalBarcode =
+            if (itemBean.barcode.isNullOrBlank()) {
+                val idPadded = generatedId.toString().padStart(Constants.Barcode.ID_LENGTH, '0')
+                "${Constants.Barcode.PREFIX}${Constants.Barcode.TYPE_ITEM}$idPadded${Constants.Barcode.SUFFIX}"
+            } else {
+                itemBean.barcode
+            }
+
+        val item = ItemEntity(generatedId, finalBarcode, itemBean.name, itemBean.price)
         val savedItem = repository.save(item)
-        logger.info("Item created successfully with ID: {}", savedItem.id)
+        logger.info("Item created successfully with ID: {}, barcode: {}", savedItem.id, savedItem.barcode)
         return savedItem
     }
 
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/ReceiptService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/ReceiptService.kt
index 580b929..541ca40 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/ReceiptService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/ReceiptService.kt
@@ -17,7 +17,6 @@ import java.util.*
 @Service
 class ReceiptService(
     private val storeService: StoreService,
-    private val staffService: StaffService,
     private val appProperties: AppProperties,
 ) {
     private val logger = LoggerFactory.getLogger(ReceiptService::class.java)
@@ -28,13 +27,12 @@ class ReceiptService(
     fun printReceipt(
         storeId: Int,
         items: List<ItemBean>,
-        staffBarcode: String,
         deposit: Int,
     ): Boolean {
         logger.debug("Printing receipt for store: {}, items: {}", storeId, items.size)
 
         return try {
-            val receiptDetail = createReceiptDetail(storeId, items, staffBarcode, deposit)
+            val receiptDetail = createReceiptDetail(storeId, items, deposit)
             val printerIp = getPrinterIp(storeId) ?: return false
 
             sendToPrinter(printerIp, receiptDetail)
@@ -52,26 +50,23 @@ class ReceiptService(
     private fun createReceiptDetail(
         storeId: Int,
         items: List<ItemBean>,
-        staffBarcode: String,
         deposit: Int,
     ): ReceiptDetail {
         val itemEntities =
             items.map { itemBean ->
                 ItemEntity(
                     id = itemBean.id!!,
-                    barcode = itemBean.barcode,
+                    barcode = itemBean.barcode ?: "",
                     name = itemBean.name,
                     price = itemBean.price,
                 )
             }
 
         val storeName = storeService.findStore(storeId)?.name
-        val staffName = staffService.findStaff(staffBarcode)?.name
 
         return ReceiptDetail(
             items = itemEntities,
             storeName = storeName,
-            staffName = staffName,
             deposit = deposit,
             transactionId = UUID.randomUUID().toString(),
             createdAt = Date(),
@@ -126,18 +121,15 @@ class ReceiptService(
     fun generateReceiptContent(
         storeId: Int,
         items: List<ItemBean>,
-        staffBarcode: String,
         deposit: Int,
     ): String {
         val storeName = storeService.findStore(storeId)?.name ?: "Unknown Store"
-        val staffName = staffService.findStaff(staffBarcode)?.name ?: "Unknown Staff"
         val totalAmount = items.sumOf { it.price }
         val change = deposit - totalAmount
 
         return buildString {
             appendLine("========== RECEIPT ==========")
             appendLine("Store: $storeName")
-            appendLine("Staff: $staffName")
             appendLine("Date: ${Date()}")
             appendLine("-----------------------------")
             items.forEach { item ->
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleExcelReportService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleExcelReportService.kt
index 9f8f4e3..adff01b 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleExcelReportService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleExcelReportService.kt
@@ -24,7 +24,6 @@ class SaleExcelReportService(
     private val saleDetailRepository: SaleDetailRepository,
     private val itemRepository: ItemRepository,
     private val storeRepository: StoreRepository,
-    private val staffRepository: StaffRepository,
 ) {
     private val logger = LoggerFactory.getLogger(SaleExcelReportService::class.java)
     private val dateFormat = SimpleDateFormat("yyyy/MM/dd HH:mm")
@@ -63,12 +62,6 @@ class SaleExcelReportService(
     private fun prepareSalesReportData(sales: List<SaleEntity>): List<SaleReportData> =
         sales.map { sale ->
             val store = storeRepository.findById(sale.storeId).orElse(null)
-            val staff =
-                if (sale.staffId > 0) {
-                    staffRepository.findById(sale.staffId.toString()).orElse(null)
-                } else {
-                    null
-                }
             val details =
                 saleDetailRepository.findBySaleId(sale.id).map { detail ->
                     val item = itemRepository.findById(detail.itemId).orElse(null)
@@ -85,8 +78,6 @@ class SaleExcelReportService(
                 saleId = sale.id,
                 storeId = sale.storeId,
                 storeName = store?.name ?: "不明な店舗",
-                staffId = sale.staffId,
-                staffName = staff?.name ?: "不明なスタッフ",
                 quantity = sale.quantity,
                 amount = sale.amount,
                 createdAt = sale.createdAt,
@@ -224,7 +215,7 @@ class SaleExcelReportService(
 
         // ヘッダー行
         val headerRow = sheet.createRow(rowNum++)
-        val headers = listOf("売上ID", "日時", "店舗名", "スタッフ名", "商品数", "金額", "商品明細")
+        val headers = listOf("売上ID", "日時", "店舗名", "商品数", "金額", "商品明細")
         headers.forEachIndexed { index, header ->
             val cell = headerRow.createCell(index)
             cell.setCellValue(header)
@@ -241,10 +232,9 @@ class SaleExcelReportService(
             dateCell.cellStyle = dateStyle
 
             row.createCell(2).setCellValue(sale.storeName)
-            row.createCell(3).setCellValue(sale.staffName)
-            row.createCell(4).setCellValue(sale.quantity.toDouble())
+            row.createCell(3).setCellValue(sale.quantity.toDouble())
 
-            val amountCell = row.createCell(5)
+            val amountCell = row.createCell(4)
             amountCell.setCellValue(sale.amount.toDouble())
             amountCell.cellStyle = currencyStyle
 
@@ -256,18 +246,18 @@ class SaleExcelReportService(
                 } else {
                     "-"
                 }
-            row.createCell(6).setCellValue(detailText)
+            row.createCell(5).setCellValue(detailText)
         }
 
         // 合計行
         val totalRow = sheet.createRow(rowNum++)
-        totalRow.createCell(3).setCellValue("合計")
-        val totalCell = totalRow.createCell(5)
+        totalRow.createCell(2).setCellValue("合計")
+        val totalCell = totalRow.createCell(4)
         totalCell.setCellValue(reportData.sumOf { it.amount }.toDouble())
         totalCell.cellStyle = currencyStyle
 
         // 列幅の自動調整
-        for (i in 0..6) {
+        for (i in 0..5) {
             sheet.autoSizeColumn(i)
         }
     }
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/SalePersistenceService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/SalePersistenceService.kt
index 6285ae3..96adf97 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/SalePersistenceService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/SalePersistenceService.kt
@@ -34,7 +34,6 @@ class SalePersistenceService(
         items: List<ItemBean>,
     ): SaleEntity {
         val saleId = idGenerationService.generateNextId(saleRepository)
-        val staffId = extractStaffId(saleBean.staffBarcode)
         val totalAmount = saleCalculationService.calculateSaleAmount(items)
         val quantity = saleCalculationService.calculateQuantity(items)
 
@@ -42,7 +41,6 @@ class SalePersistenceService(
             SaleEntity(
                 id = saleId,
                 storeId = saleBean.storeId,
-                staffId = staffId,
                 quantity = quantity,
                 amount = totalAmount,
                 deposit = saleBean.deposit,
@@ -99,16 +97,6 @@ class SalePersistenceService(
         return savedDetails
     }
 
-    /**
-     * Extract staff ID from barcode
-     */
-    private fun extractStaffId(staffBarcode: String?): Int =
-        if (!staffBarcode.isNullOrEmpty() && staffBarcode.length > 4) {
-            staffBarcode.takeLast(3).toIntOrNull() ?: 0
-        } else {
-            0
-        }
-
     /**
      * Find sale by ID
      */
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleReportService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleReportService.kt
index 91246e0..f0624c2 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleReportService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleReportService.kt
@@ -31,7 +31,6 @@ class SaleReportService(
     private val saleDetailRepository: SaleDetailRepository,
     private val itemRepository: ItemRepository,
     private val storeRepository: StoreRepository,
-    private val staffRepository: StaffRepository,
 ) {
     private val logger = LoggerFactory.getLogger(SaleReportService::class.java)
     private val dateFormat = SimpleDateFormat("yyyy/MM/dd HH:mm")
@@ -70,12 +69,6 @@ class SaleReportService(
     private fun prepareSalesReportData(sales: List<SaleEntity>): List<SaleReportData> =
         sales.map { sale ->
             val store = storeRepository.findById(sale.storeId).orElse(null)
-            val staff =
-                if (sale.staffId > 0) {
-                    staffRepository.findById(sale.staffId.toString()).orElse(null)
-                } else {
-                    null
-                }
             val details =
                 saleDetailRepository.findBySaleId(sale.id).map { detail ->
                     val item = itemRepository.findById(detail.itemId).orElse(null)
@@ -92,8 +85,6 @@ class SaleReportService(
                 saleId = sale.id,
                 storeId = sale.storeId,
                 storeName = store?.name ?: "不明な店舗",
-                staffId = sale.staffId,
-                staffName = staff?.name ?: "不明なスタッフ",
                 quantity = sale.quantity,
                 amount = sale.amount,
                 createdAt = sale.createdAt,
@@ -209,14 +200,13 @@ class SaleReportService(
         document.add(tableTitle)
 
         val table =
-            Table(UnitValue.createPercentArray(floatArrayOf(10f, 20f, 15f, 15f, 15f, 15f, 10f)))
+            Table(UnitValue.createPercentArray(floatArrayOf(10f, 20f, 20f, 15f, 15f, 20f)))
                 .useAllAvailableWidth()
 
         // ヘッダー行
         table.addHeaderCell(createHeaderCell("売上ID"))
         table.addHeaderCell(createHeaderCell("日時"))
         table.addHeaderCell(createHeaderCell("店舗"))
-        table.addHeaderCell(createHeaderCell("スタッフ"))
         table.addHeaderCell(createHeaderCell("商品数"))
         table.addHeaderCell(createHeaderCell("金額"))
         table.addHeaderCell(createHeaderCell("詳細"))
@@ -226,7 +216,6 @@ class SaleReportService(
             table.addCell(createDataCell(sale.saleId.toString()))
             table.addCell(createDataCell(dateFormat.format(sale.createdAt)))
             table.addCell(createDataCell(sale.storeName))
-            table.addCell(createDataCell(sale.staffName))
             table.addCell(createDataCell(sale.quantity.toString()))
             table.addCell(createDataCell("¥${numberFormat.format(sale.amount)}"))
 
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleService.kt
index 775f0ca..00b837c 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleService.kt
@@ -39,9 +39,6 @@ class SaleService(
     @Autowired
     private lateinit var storeRepository: StoreRepository
 
-    @Autowired
-    private lateinit var staffRepository: StaffRepository
-
     fun findAllSale(): List<SaleEntity> = saleRepository.findAll()
 
     fun findAllSaleDetail(): List<SaleDetailEntity> = saleDetailRepository.findAll()
@@ -64,14 +61,6 @@ class SaleService(
         val id = idGenerationService.generateNextId(saleRepository)
 
         // 売り上げを保存
-        val staffId =
-            if (!saleBean.staffBarcode.isNullOrEmpty() && saleBean.staffBarcode.length > Constants.Barcode.MIN_LENGTH) {
-                saleBean.staffBarcode
-                    .substring(saleBean.staffBarcode.length - Constants.Barcode.SUFFIX_LENGTH)
-                    .toIntOrNull() ?: 0
-            } else {
-                0
-            }
         items.forEach {
             logger.debug("Item - ID: {}, Name: {}, Price: {}", it.id, it.name, it.price)
         }
@@ -79,7 +68,6 @@ class SaleService(
             SaleEntity(
                 id,
                 saleBean.storeId,
-                staffId,
                 items.size,
                 items.sumOf { it.price },
                 saleBean.deposit,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleValidationService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleValidationService.kt
index 1a17bfe..658b3c3 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleValidationService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/SaleValidationService.kt
@@ -33,8 +33,6 @@ class SaleValidationService {
         logger.debug("Validating sale request for store: {}", saleBean.storeId)
 
         validateStoreId(saleBean.storeId)
-        // staffBarcode is now optional, skip validation
-        // validateStaffBarcode(saleBean.staffBarcode)
         validateItems(items)
         validateDeposit(saleBean, items)
 
@@ -50,15 +48,6 @@ class SaleValidationService {
         }
     }
 
-    /**
-     * Validate staff barcode
-     */
-    private fun validateStaffBarcode(staffBarcode: String) {
-        if (staffBarcode.isBlank()) {
-            throw IllegalArgumentException("Staff barcode cannot be empty")
-        }
-    }
-
     /**
      * Validate items list
      */
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/StaffService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/StaffService.kt
deleted file mode 100644
index 8729c2c..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/StaffService.kt
+++ /dev/null
@@ -1,67 +0,0 @@
-package info.nukoneko.kidspos.server.service
-
-import info.nukoneko.kidspos.server.config.CacheConfig
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import info.nukoneko.kidspos.server.repository.StaffRepository
-import org.slf4j.LoggerFactory
-import org.springframework.cache.annotation.Cacheable
-import org.springframework.data.repository.findByIdOrNull
-import org.springframework.stereotype.Service
-import org.springframework.transaction.annotation.Transactional
-
-/**
- * Service for managing staff member operations
- *
- * Handles CRUD operations for staff data with caching support for improved
- * performance. Staff members are identified by barcode IDs and this service
- * provides efficient lookup capabilities for POS operations where staff
- * authentication is required.
- *
- * Key responsibilities:
- * - Managing staff member data retrieval
- * - Providing cached access to staff information
- * - Supporting barcode-based staff identification
- * - Maintaining data consistency through proper caching strategies
- *
- * Caching strategy:
- * - All staff data cached for bulk operations
- * - Individual staff lookup cached by barcode ID
- * - Cache warming through findAll() method
- *
- * @constructor Creates StaffService with required repository
- * @param repository Repository for staff data access
- */
-@Service
-@Transactional
-class StaffService(
-    private val repository: StaffRepository,
-) {
-    private val logger = LoggerFactory.getLogger(StaffService::class.java)
-
-    @Cacheable(value = [CacheConfig.STAFF_CACHE])
-    fun findAll(): List<StaffEntity> {
-        logger.debug("Fetching all staff from database")
-        return repository.findAll()
-    }
-
-    @Cacheable(value = [CacheConfig.STAFF_BY_ID_CACHE], key = "#barcode")
-    fun findStaff(barcode: String): StaffEntity? {
-        logger.debug("Fetching staff by barcode: {} from database", barcode)
-        return repository.findByIdOrNull(barcode)
-    }
-
-    fun save(staff: StaffEntity): StaffEntity {
-        logger.debug("Saving staff with barcode: {}", staff.barcode)
-        return repository.save(staff)
-    }
-
-    fun delete(barcode: String) {
-        logger.debug("Deleting staff with barcode: {}", barcode)
-        repository.deleteById(barcode)
-    }
-
-    fun delete(staff: StaffEntity) {
-        logger.debug("Deleting staff entity with barcode: {}", staff.barcode)
-        repository.delete(staff)
-    }
-}
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/ValidationService.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/ValidationService.kt
index f689c32..52ab049 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/ValidationService.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/ValidationService.kt
@@ -3,7 +3,6 @@ package info.nukoneko.kidspos.server.service
 import info.nukoneko.kidspos.common.Constants
 import info.nukoneko.kidspos.server.domain.exception.ValidationException
 import info.nukoneko.kidspos.server.repository.ItemRepository
-import info.nukoneko.kidspos.server.repository.StaffRepository
 import info.nukoneko.kidspos.server.repository.StoreRepository
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Service
@@ -24,21 +23,19 @@ import org.springframework.stereotype.Service
  * - Centralizing business rule logic for maintainability
  *
  * Validation categories:
- * - Entity existence validation (items, stores, staff)
- * - Uniqueness validation (barcodes, staff IDs)
+ * - Entity existence validation (items, stores)
+ * - Uniqueness validation (barcodes)
  * - Range validation (prices, quantities)
  * - Business rule enforcement
  *
  * @constructor Creates ValidationService with required repositories
  * @param itemRepository Repository for item data validation
  * @param storeRepository Repository for store data validation
- * @param staffRepository Repository for staff data validation
  */
 @Service
 class ValidationService(
     private val itemRepository: ItemRepository,
     private val storeRepository: StoreRepository,
-    private val staffRepository: StaffRepository,
 ) {
     private val logger = LoggerFactory.getLogger(ValidationService::class.java)
 
@@ -56,17 +53,15 @@ class ValidationService(
         }
     }
 
-    fun validateStaffExists(staffId: String) {
-        if (!staffRepository.existsById(staffId)) {
-            logger.warn("Validation failed: Staff with ID {} does not exist", staffId)
-            throw ValidationException("Staff with ID $staffId does not exist")
-        }
-    }
-
     fun validateBarcodeUnique(
-        barcode: String,
+        barcode: String?,
         excludeId: Int? = null,
     ) {
+        // nullの場合は自動生成されるためバリデーションスキップ
+        if (barcode.isNullOrBlank()) {
+            return
+        }
+
         val existingItem = itemRepository.findByBarcode(barcode)
         if (existingItem != null && existingItem.id != excludeId) {
             logger.warn("Validation failed: Barcode {} already exists", barcode)
@@ -74,20 +69,6 @@ class ValidationService(
         }
     }
 
-    fun validateStaffBarcodeUnique(
-        barcode: String,
-        excludeId: String? = null,
-    ) {
-        // Since StaffRepository doesn't have findByBarcode, we'll check by ID for now
-        // This would need to be enhanced with a proper query method
-        if (excludeId == null || excludeId != barcode) {
-            if (staffRepository.existsById(barcode)) {
-                logger.warn("Validation failed: Staff barcode {} already exists", barcode)
-                throw ValidationException("Staff barcode $barcode already exists")
-            }
-        }
-    }
-
     fun validateStoreBarcodeUnique(
         barcode: String,
         excludeId: Int? = null,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/ItemMapper.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/ItemMapper.kt
index 7604d4b..a2f48ff 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/ItemMapper.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/ItemMapper.kt
@@ -45,7 +45,7 @@ class ItemMapper {
     ): ItemEntity =
         ItemEntity(
             id = id,
-            barcode = request.barcode,
+            barcode = request.barcode ?: "",
             name = request.name,
             price = request.price,
         )
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/SaleMapper.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/SaleMapper.kt
index 2ffea3f..ee8e45e 100644
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/SaleMapper.kt
+++ b/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/SaleMapper.kt
@@ -5,7 +5,6 @@ import info.nukoneko.kidspos.server.controller.dto.response.SaleResponse
 import info.nukoneko.kidspos.server.entity.SaleEntity
 import info.nukoneko.kidspos.server.repository.ItemRepository
 import info.nukoneko.kidspos.server.repository.SaleDetailRepository
-import info.nukoneko.kidspos.server.repository.StaffRepository
 import info.nukoneko.kidspos.server.repository.StoreRepository
 import org.springframework.stereotype.Component
 import java.time.LocalDateTime
@@ -24,8 +23,7 @@ import java.time.ZoneId
  *   with full relationship resolution and calculated fields
  * - **Relationship Resolution**: Dynamically resolves and populates related data from:
  *   - Store information via StoreRepository
- *   - Staff details via StaffRepository
- *   - Item details via ItemRepository
+ * *   - Item details via ItemRepository
  *   - Sale line items via SaleDetailRepository
  * - **Financial Calculations**: Computes derived values like change amounts and subtotals
  * - **Temporal Conversion**: Handles timestamp conversions from database format to LocalDateTime
@@ -35,7 +33,6 @@ import java.time.ZoneId
  * ```
  * SaleEntity -> SaleResponse (with full relationship data)
  * ├─ Store lookup -> StoreName population
- * ├─ Staff lookup -> StaffName population
  * ├─ SaleDetail lookup -> Item list construction
  * └─ Item lookup per detail -> Complete item information
  *
@@ -46,7 +43,7 @@ import java.time.ZoneId
  * - **Multi-Repository Coordination**: Performs coordinated lookups across four repositories
  *   to build complete sale representations with all related data
  * - **Graceful Degradation**: Handles missing related entities by providing fallback values
- *   ("Unknown Store", "Unknown Staff", "Unknown" item names)
+ *   ("Unknown Store", "Unknown" item names)
  * - **Financial Integrity**: Calculates change amounts using deposit minus total logic
  * - **Timezone Handling**: Converts UTC timestamps to system timezone for display
  * - **Performance Considerations**: Each sale response requires multiple database queries,
@@ -61,12 +58,10 @@ import java.time.ZoneId
  * ## Repository Dependencies:
  * This mapper requires injected repositories for relationship resolution:
  * - StoreRepository: Store name and details
- * - StaffRepository: Staff member information
  * - ItemRepository: Product details and pricing
  * - SaleDetailRepository: Individual line items per sale
  *
  * @param storeRepository Repository for store data lookup
- * @param staffRepository Repository for staff data lookup
  * @param itemRepository Repository for item/product data lookup
  * @param saleDetailRepository Repository for sale line item lookup
  *
@@ -78,13 +73,11 @@ import java.time.ZoneId
 @Component
 class SaleMapper(
     private val storeRepository: StoreRepository,
-    private val staffRepository: StaffRepository,
     private val itemRepository: ItemRepository,
     private val saleDetailRepository: SaleDetailRepository,
 ) {
     fun toResponse(entity: SaleEntity): SaleResponse {
         val store = storeRepository.findById(entity.storeId).orElse(null)
-        val staff = staffRepository.findById(entity.staffId.toString()).orElse(null)
         val saleDetails = saleDetailRepository.findBySaleId(entity.id)
 
         val items =
@@ -104,8 +97,6 @@ class SaleMapper(
             id = entity.id,
             storeId = entity.storeId,
             storeName = store?.name ?: "Unknown Store",
-            staffId = entity.staffId.toString(),
-            staffName = staff?.name ?: "Unknown Staff",
             totalAmount = entity.amount,
             deposit = entity.deposit,
             change = entity.deposit - entity.amount,
diff --git a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/StaffMapper.kt b/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/StaffMapper.kt
deleted file mode 100644
index f3d4ca7..0000000
--- a/src/main/kotlin/info/nukoneko/kidspos/server/service/mapper/StaffMapper.kt
+++ /dev/null
@@ -1,63 +0,0 @@
-package info.nukoneko.kidspos.server.service.mapper
-
-import info.nukoneko.kidspos.server.controller.dto.response.StaffResponse
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import org.springframework.stereotype.Component
-
-/**
- * Data mapper for Staff entities and DTOs
- *
- * This mapper handles unidirectional data transformation from Staff domain objects
- * to their corresponding Data Transfer Objects for API responses. It manages
- * the conversion of staff information while handling data structure differences
- * and providing default values for missing attributes.
- *
- * ## Mapping Responsibilities:
- * - **Entity to Response**: Transforms StaffEntity objects into StaffResponse DTOs
- *   for API consumption and frontend display
- * - **ID Normalization**: Uses barcode as the primary identifier in both ID and
- *   barcode fields of the response to maintain consistency
- * - **Default Value Assignment**: Provides sensible defaults for missing data
- *   such as default store assignments and null timestamps
- * - **Batch Operations**: Supports efficient list transformations for staff collections
- *
- * ## Data Flow Patterns:
- * ```
- * StaffEntity -> StaffResponse (for API responses)
- * List<StaffEntity> -> List<StaffResponse> (for collection endpoints)
- * ```
- *
- * ## Implementation Specifics:
- * - **Barcode as ID**: The StaffEntity uses barcode as the primary identifier,
- *   which is mapped to both the ID and barcode fields in the response
- * - **Default Store Assignment**: Staff members are assigned to store ID 1 by default
- *   since store relationships are not maintained in the current entity structure
- * - **Missing Relationships**: Store name lookup is not performed, leaving storeName null
- * - **Timestamp Compatibility**: CreatedAt and updatedAt fields are set to null
- *   as they're not available in the current entity
- *
- * ## Business Context:
- * Staff members represent employees who can operate the Kids POS system.
- * This mapper ensures consistent staff data presentation while maintaining
- * compatibility with response contracts that expect store associations and
- * audit timestamps, even when this data is not currently tracked.
- *
- * @see StaffEntity
- * @see StaffResponse
- * @since 1.0.0
- */
-@Component
-class StaffMapper {
-    fun toResponse(entity: StaffEntity): StaffResponse =
-        StaffResponse(
-            id = entity.barcode, // barcode is the ID in StaffEntity
-            name = entity.name,
-            barcode = entity.barcode,
-            storeId = 1, // Default store ID since not available in entity
-            storeName = null, // Not available without additional lookup
-            createdAt = null, // Not available in current entity
-            updatedAt = null, // Not available in current entity
-        )
-
-    fun toResponseList(entities: List<StaffEntity>): List<StaffResponse> = entities.map { toResponse(it) }
-}
diff --git a/src/main/resources/db/migration/V000__create_tables.sql b/src/main/resources/db/migration/V000__create_tables.sql
index 07589d0..3d72c29 100644
--- a/src/main/resources/db/migration/V000__create_tables.sql
+++ b/src/main/resources/db/migration/V000__create_tables.sql
@@ -14,21 +14,6 @@ CREATE TABLE IF NOT EXISTS store
     printer_uri VARCHAR(255)
 );
 
--- Staff table
-CREATE TABLE IF NOT EXISTS staff
-(
-    id
-             INTEGER
-        PRIMARY
-            KEY
-        AUTOINCREMENT,
-    barcode
-             VARCHAR(255) NOT NULL UNIQUE,
-    name     VARCHAR(255) NOT NULL,
-    discount DECIMAL(5,
-                 2) DEFAULT 0,
-    password VARCHAR(255)
-);
 
 -- Item table
 CREATE TABLE IF NOT EXISTS item
@@ -55,8 +40,6 @@ CREATE TABLE IF NOT EXISTS sale
         AUTOINCREMENT,
     store_id
         INTEGER,
-    staff_id
-        INTEGER,
     amount
         INTEGER
         NOT
@@ -78,13 +61,6 @@ CREATE TABLE IF NOT EXISTS sale
         (
          store_id
             ) REFERENCES store
-        (
-         id
-            ),
-    FOREIGN KEY
-        (
-         staff_id
-            ) REFERENCES staff
         (
          id
             )
@@ -150,4 +126,4 @@ VALUES ('receipt.shop_name', 'KidsPOS Shop');
 INSERT
     OR IGNORE
 INTO setting (key, value)
-VALUES ('receipt.footer_message', 'Thank you for your purchase!');
\ No newline at end of file
+VALUES ('receipt.footer_message', 'Thank you for your purchase!');
diff --git a/src/main/resources/db/migration/V001__create_indexes.sql b/src/main/resources/db/migration/V001__create_indexes.sql
index 46a596d..73ebd9d 100644
--- a/src/main/resources/db/migration/V001__create_indexes.sql
+++ b/src/main/resources/db/migration/V001__create_indexes.sql
@@ -17,8 +17,6 @@ CREATE INDEX IF NOT EXISTS idx_sale_created_at ON sale (created_at);
 CREATE INDEX IF NOT EXISTS idx_sale_detail_sale_id ON sale_detail (sale_id);
 CREATE INDEX IF NOT EXISTS idx_sale_detail_item_id ON sale_detail (item_id);
 
--- Index on staff barcode for authentication
-CREATE INDEX IF NOT EXISTS idx_staff_barcode ON staff (barcode);
 
 -- Index on setting key for configuration lookups
-CREATE INDEX IF NOT EXISTS idx_setting_key ON setting (key);
\ No newline at end of file
+CREATE INDEX IF NOT EXISTS idx_setting_key ON setting (key);
diff --git a/src/main/resources/static/css/modern-style.css b/src/main/resources/static/css/modern-style.css
index fb2f46b..c756164 100644
--- a/src/main/resources/static/css/modern-style.css
+++ b/src/main/resources/static/css/modern-style.css
@@ -181,11 +181,6 @@ body {
     padding: 1.5rem 2rem;
 }
 
-/* Fix for duplicate elements */
-.card-modern .d-flex:nth-child(2) {
-    display: none !important;
-}
-
 /* Override old styles */
 body {
     background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
diff --git a/src/main/resources/tables.schema b/src/main/resources/tables.schema
index c0a53e9..2d02857 100644
--- a/src/main/resources/tables.schema
+++ b/src/main/resources/tables.schema
@@ -9,7 +9,6 @@ CREATE TABLE IF NOT EXISTS sale
 (
   id        INTEGER PRIMARY KEY,
   store_id  INTEGER,
-  staff_id  INTEGER,
   quantity  INTEGER,
   amount    INTEGER,
   createdAt DATETIME DEFAULT CURRENT_TIMESTAMP
@@ -30,12 +29,6 @@ CREATE TABLE IF NOT EXISTS store
   name varchar(255) NOT NULL
 );
 
-CREATE TABLE IF NOT EXISTS staff
-(
-  id   INTEGER PRIMARY KEY,
-  barcode varchar(255) NOT NULL UNIQUE,
-  name    varchar(255) NOT NULL
-);
 
 CREATE TABLE IF NOT EXISTS setting
 (
diff --git a/src/main/resources/templates/index-modern.html b/src/main/resources/templates/index-modern.html
index d412a27..f84d3ed 100644
--- a/src/main/resources/templates/index-modern.html
+++ b/src/main/resources/templates/index-modern.html
@@ -47,13 +47,6 @@ <h1 class="page-title">
                                     <i class="fas fa-store stats-icon"></i>
                                 </div>
                             </div>
-                            <div class="col-lg-3 col-md-6 mb-3">
-                                <div class="stats-card">
-                                    <div class="stats-value">0</div>
-                                    <div class="stats-label">スタッフ数</div>
-                                    <i class="fas fa-users stats-icon"></i>
-                                </div>
-                            </div>
                         </div>
                         
                         <!-- Quick Actions -->
@@ -160,4 +153,4 @@ <h1 class="page-title">
         });
     </script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/main/resources/templates/index.html b/src/main/resources/templates/index.html
index 19572a9..2648a25 100644
--- a/src/main/resources/templates/index.html
+++ b/src/main/resources/templates/index.html
@@ -81,17 +81,6 @@ <h3 class="h4">店舗管理</h3>
                             </a>
                         </div>
                         
-                        <div class="col-lg-4 col-md-6">
-                            <a href="/staffs" class="text-decoration-none">
-                                <div class="card-modern h-100">
-                                    <div class="card-body text-center p-4">
-                                        <i class="fas fa-users fa-3x text-info mb-3"></i>
-                                        <h3 class="h4">スタッフ管理</h3>
-                                        <p class="text-muted">スタッフの登録・管理</p>
-                                    </div>
-                                </div>
-                            </a>
-                        </div>
                         
                         <div class="col-lg-4 col-md-6">
                             <a href="/sales" class="text-decoration-none">
@@ -146,4 +135,4 @@ <h3 class="h4">システム設定</h3>
         </div>
     </div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/main/resources/templates/items/edit.html b/src/main/resources/templates/items/edit.html
index 53430b9..d393352 100644
--- a/src/main/resources/templates/items/edit.html
+++ b/src/main/resources/templates/items/edit.html
@@ -35,12 +35,18 @@ <h4 class="mb-4 text-center">
                                 </h4>
                                 <form th:action="@{/items/{id}/update(id=${item.id})}" method="post">
                                     <div class="mb-3">
-                                        <label for="barcode" class="form-label">バーコード <span class="text-danger">*</span></label>
-                                        <input type="text" id="barcode" name="barcode" class="form-control" th:value="${item.barcode}" required
-                                               placeholder="8〜13桁の数字で入力"
-                                               pattern="^\d{8,13}$"
-                                               title="バーコードは8〜13桁の数字で入力してください">
-                                        <div class="form-text">バーコードは8〜13桁の数字で入力してください</div>
+                                        <label for="barcodeId" class="form-label">バーコードID <span class="text-danger">*</span></label>
+                                        <div class="input-group">
+                                            <span class="input-group-text">A01</span>
+                                            <input type="text" id="barcodeId" class="form-control" required
+                                                   placeholder="6桁の数字"
+                                                   pattern="^\d{6}$"
+                                                   maxlength="6"
+                                                   title="6桁の数字を入力してください"/>
+                                            <span class="input-group-text">A</span>
+                                        </div>
+                                        <input type="hidden" id="barcode" name="barcode" th:value="${item.barcode}"/>
+                                        <div class="form-text">6桁の数字を入力（例: 000001 → A01000001A）</div>
                                     </div>
                                     <div class="mb-3">
                                         <label for="name" class="form-label">商品名 <span class="text-danger">*</span></label>
@@ -84,5 +90,37 @@ <h4 class="mb-4 text-center">
         </div>
     </div>
 </div>
+<script>
+    // ページ読み込み時に既存のバーコードから6桁のIDを抽出
+    window.addEventListener('DOMContentLoaded', function() {
+        const barcodeField = document.getElementById('barcode');
+        const barcodeIdField = document.getElementById('barcodeId');
+
+        if (barcodeField.value) {
+            // A01XXXXXXA から XXXXXX を抽出（3文字目から6文字）
+            const match = barcodeField.value.match(/^A\d{2}(\d{6})A$/);
+            if (match) {
+                barcodeIdField.value = match[1];
+            }
+        }
+    });
+
+    // バーコードIDの入力を監視してフォーマット
+    document.getElementById('barcodeId').addEventListener('input', function(e) {
+        // 数字のみ許可
+        this.value = this.value.replace(/[^0-9]/g, '');
+    });
+
+    // フォーム送信時にバーコードを生成
+    document.querySelector('form').addEventListener('submit', function(e) {
+        const barcodeId = document.getElementById('barcodeId').value;
+        const barcodeField = document.getElementById('barcode');
+
+        if (barcodeId && barcodeId.length === 6) {
+            // 6桁の場合、A01 + ID + A のフォーマットで設定
+            barcodeField.value = 'A01' + barcodeId + 'A';
+        }
+    });
+</script>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/items/index.html b/src/main/resources/templates/items/index.html
index a8bd508..f2d2afc 100644
--- a/src/main/resources/templates/items/index.html
+++ b/src/main/resources/templates/items/index.html
@@ -26,10 +26,10 @@
                         <div class="card-modern">
                             <div class="card-body">
                                 <div class="d-flex justify-content-between align-items-center mb-4">
-                                    <h4 class="mb-0">
+                                    <h1 class="mb-0">
                                         <i class="fas fa-box text-primary me-2"></i>
                                         商品管理
-                                    </h4>
+                                    </h1>
                                     <a href="/items/new" class="btn btn-primary">
                                         <i class="fas fa-plus"></i> 新規作成
                                     </a>
@@ -41,9 +41,9 @@ <h4 class="mb-0">
                                         <button id="printSelected" class="btn btn-success btn-sm" disabled>
                                             <i class="fas fa-print"></i> 選択印刷
                                         </button>
-                                        <a href="/api/item/barcode-pdf" class="btn btn-info btn-sm" target="_blank">
+                                        <button id="downloadPdf" class="btn btn-info btn-sm">
                                             <i class="fas fa-file-pdf"></i> PDF出力
-                                        </a>
+                                        </button>
                                     </div>
                                     <div class="d-flex align-items-center gap-3">
                                         <div class="form-check mb-0">
@@ -161,6 +161,36 @@ <h4 class="mb-0">
                 printButton.disabled = !anyChecked;
             }
 
+            // PDF出力ボタン
+            const downloadPdfButton = document.getElementById('downloadPdf');
+            downloadPdfButton.addEventListener('click', function () {
+                fetch('/api/item/barcode-pdf')
+                    .then(response => {
+                        if (!response.ok) {
+                            throw new Error('PDF生成に失敗しました');
+                        }
+                        return response.blob();
+                    })
+                    .then(blob => {
+                        // PDFをダウンロード
+                        const url = window.URL.createObjectURL(blob);
+                        const a = document.createElement('a');
+                        a.href = url;
+                        a.download = 'barcodes.pdf';
+                        document.body.appendChild(a);
+                        a.click();
+                        window.URL.revokeObjectURL(url);
+                        document.body.removeChild(a);
+                    })
+                    .catch(error => {
+                        if (window.Swal) {
+                            Swal.fire('エラー', error.message, 'error');
+                        } else {
+                            alert('エラー: ' + error.message);
+                        }
+                    });
+            });
+
             // 選択した商品を印刷
             printButton.addEventListener('click', function () {
                 const selectedIds = [];
diff --git a/src/main/resources/templates/items/new.html b/src/main/resources/templates/items/new.html
index d4c10bd..9ce0d28 100644
--- a/src/main/resources/templates/items/new.html
+++ b/src/main/resources/templates/items/new.html
@@ -40,12 +40,18 @@ <h4 class="mb-4 text-center">
                                         <input id="name" name="name" type="text" class="form-control" required placeholder="商品名を入力してください"/>
                                     </div>
                                     <div class="mb-3">
-                                        <label for="barcode" class="form-label">バーコード</label>
-                                        <input id="barcode" name="barcode" type="text" class="form-control"
-                                               placeholder="8〜13桁の数字で入力"
-                                               pattern="^\d{8,13}$"
-                                               title="バーコードは8〜13桁の数字で入力してください"/>
-                                        <div class="form-text">バーコードは8〜13桁の数字で入力してください（任意）</div>
+                                        <label for="barcodeId" class="form-label">バーコードID</label>
+                                        <div class="input-group">
+                                            <span class="input-group-text">A01</span>
+                                            <input id="barcodeId" type="text" class="form-control"
+                                                   placeholder="6桁の数字（空欄で自動生成）"
+                                                   pattern="^\d{6}$"
+                                                   maxlength="6"
+                                                   title="6桁の数字を入力してください"/>
+                                            <span class="input-group-text">A</span>
+                                        </div>
+                                        <input type="hidden" id="barcode" name="barcode"/>
+                                        <div class="form-text">6桁の数字を入力（空欄で自動生成、例: 000001 → A01000001A）</div>
                                     </div>
                                     <div class="mb-4">
                                         <label for="price" class="form-label">価格 <span class="text-danger">*</span></label>
@@ -73,5 +79,26 @@ <h4 class="mb-4 text-center">
     </div>
 </div>
 <script src="/validation.js"></script>
+<script>
+    // バーコードIDの入力を監視してフォーマット
+    document.getElementById('barcodeId').addEventListener('input', function(e) {
+        // 数字のみ許可
+        this.value = this.value.replace(/[^0-9]/g, '');
+    });
+
+    // フォーム送信時にバーコードを生成
+    document.querySelector('form').addEventListener('submit', function(e) {
+        const barcodeId = document.getElementById('barcodeId').value;
+        const barcodeField = document.getElementById('barcode');
+
+        if (barcodeId && barcodeId.length === 6) {
+            // 6桁の場合、A01 + ID + A のフォーマットで設定
+            barcodeField.value = 'A01' + barcodeId + 'A';
+        } else {
+            // 空欄の場合は空のまま（サーバー側で自動生成）
+            barcodeField.value = '';
+        }
+    });
+</script>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/layout-modern.html b/src/main/resources/templates/layout-modern.html
index 9bb05ff..7e2436a 100644
--- a/src/main/resources/templates/layout-modern.html
+++ b/src/main/resources/templates/layout-modern.html
@@ -92,12 +92,6 @@
                     <span>店舗管理</span>
                 </a>
             </li>
-            <li>
-                <a href="/staffs" th:classappend="${#strings.contains(#request.requestURI, '/staffs')} ? 'active' : ''">
-                    <i class="fas fa-users"></i>
-                    <span>スタッフ管理</span>
-                </a>
-            </li>
             <li>
                 <a href="/sales" th:classappend="${#strings.contains(#request.requestURI, '/sales')} ? 'active' : ''">
                     <i class="fas fa-chart-line"></i>
@@ -125,4 +119,4 @@
         </ul>
     </aside>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/main/resources/templates/reports/sales.html b/src/main/resources/templates/reports/sales.html
index 4f00480..30e95df 100644
--- a/src/main/resources/templates/reports/sales.html
+++ b/src/main/resources/templates/reports/sales.html
@@ -25,10 +25,10 @@
                     <div class="col-12">
                         <div class="card-modern">
                             <div class="card-body">
-                                <h4 class="mb-4">
+                                <h1 class="mb-4">
                                     <i class="fas fa-file-pdf text-danger me-2"></i>
                                     売上レポート
-                                </h4>
+                                </h1>
 
                                 <!-- 期間指定レポート -->
                                 <div class="card mb-4">
@@ -255,4 +255,4 @@ <h5 class="mb-0"><i class="fas fa-calendar"></i> 月次レポート</h5>
 /*]]>*/
 </script>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/main/resources/templates/sales/index.html b/src/main/resources/templates/sales/index.html
index 2ca0d4c..07d80a9 100644
--- a/src/main/resources/templates/sales/index.html
+++ b/src/main/resources/templates/sales/index.html
@@ -26,10 +26,10 @@
                         <div class="card-modern">
                             <div class="card-body">
                                 <div class="d-flex justify-content-between align-items-center mb-4">
-                                    <h4 class="mb-0">
+                                    <h1 class="mb-0">
                                         <i class="fas fa-chart-line text-warning me-2"></i>
                                         売上管理
-                                    </h4>
+                                    </h1>
                                     <div class="d-flex gap-2">
                                         <button class="btn btn-info btn-sm">
                                             <i class="fas fa-download"></i> エクスポート
@@ -80,7 +80,6 @@ <h5 class="mb-0 text-success">+0%</h5>
                                             <tr>
                                                 <th>取引ID</th>
                                                 <th>店舗</th>
-                                                <th>スタッフ</th>
                                                 <th>数量</th>
                                                 <th>合計金額</th>
                                                 <th>受取金額</th>
@@ -96,9 +95,6 @@ <h5 class="mb-0 text-success">+0%</h5>
                                                 <td>
                                                     <span class="badge bg-primary" th:text="${'店舗' + sale.storeId}"></span>
                                                 </td>
-                                                <td>
-                                                    <span class="badge bg-info" th:text="${'スタッフ' + sale.staffId}"></span>
-                                                </td>
                                                 <td style="text-align: center;">
                                                     <strong th:text="${sale.quantity}"></strong>
                                                 </td>
@@ -139,4 +135,4 @@ <h5 class="mb-0 text-success">+0%</h5>
     </div>
 </div>
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/main/resources/templates/staffs/index.html b/src/main/resources/templates/staffs/index.html
deleted file mode 100644
index 942cdf8..0000000
--- a/src/main/resources/templates/staffs/index.html
+++ /dev/null
@@ -1,75 +0,0 @@
-<!DOCTYPE html>
-<html lang="ja" xmlns:th="http://www.thymeleaf.org">
-<head th:replace="~{layout::base_header(${title})}"></head>
-<body>
-<!-- ナビゲーションバー -->
-<nav class="navbar navbar-expand-lg navbar-light bg-light">
-    <div class="container">
-        <a class="navbar-brand" href="/">
-            <i class="fas fa-store"></i> KidsPOS
-        </a>
-        <div class="navbar-nav ms-auto">
-            <a class="nav-link" href="/">
-                <i class="fas fa-home"></i> ダッシュボード
-            </a>
-        </div>
-    </div>
-</nav>
-
-<div class="main-container">
-    <!-- Main Content -->
-    <div class="container-wrapper">
-        <div class="content-area">
-            <div class="container-fluid mt-3">
-                <div class="row">
-                    <div class="col-12">
-                        <div class="card-modern">
-                            <div class="card-body">
-                                <div class="d-flex justify-content-between align-items-center mb-4">
-                                    <h4 class="mb-0">
-                                        <i class="fas fa-users text-info me-2"></i>
-                                        スタッフ管理
-                                    </h4>
-                                </div>
-
-                                <div class="table-responsive">
-                                    <table id="content" class="table table-striped table-hover">
-                                        <thead>
-                                            <tr>
-                                                <th>バーコード</th>
-                                                <th>スタッフ名</th>
-                                                <th>登録日時</th>
-                                            </tr>
-                                        </thead>
-                                        <tbody>
-                                            <tr th:each="staff: ${data}">
-                                                <td>
-                                                    <code style="font-size: 0.9rem; background: #f3f4f6; color: #000; padding: 0.25rem 0.5rem; border-radius: 4px;" th:text="${staff.barcode}"></code>
-                                                </td>
-                                                <td style="font-size: 1rem;">
-                                                    <i class="fas fa-user-circle text-primary me-2"></i>
-                                                    <strong th:text="${staff.name}"></strong>
-                                                </td>
-                                                <td>
-                                                    <span class="text-muted">-</span>
-                                                </td>
-                                            </tr>
-                                        </tbody>
-                                    </table>
-                                </div>
-
-                                <div class="mt-3">
-                                    <a class="btn btn-secondary" href="/">
-                                        <i class="fas fa-arrow-left"></i> 戻る
-                                    </a>
-                                </div>
-                            </div>
-                        </div>
-                    </div>
-                </div>
-            </div>
-        </div>
-    </div>
-</div>
-</body>
-</html>
\ No newline at end of file
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/TestConfiguration.kt b/src/test/kotlin/info/nukoneko/kidspos/server/TestConfiguration.kt
index b0f3012..2b424f8 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/TestConfiguration.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/TestConfiguration.kt
@@ -3,7 +3,6 @@ package info.nukoneko.kidspos.server
 import info.nukoneko.kidspos.server.repository.*
 import info.nukoneko.kidspos.server.service.SaleService
 import info.nukoneko.kidspos.server.service.SettingService
-import info.nukoneko.kidspos.server.service.StaffService
 import info.nukoneko.kidspos.server.service.StoreService
 import org.mockito.Mockito.mock
 import org.springframework.boot.test.context.TestConfiguration
@@ -34,10 +33,6 @@ class TestConfiguration {
     @Primary
     fun mockStoreRepository(): StoreRepository = mock(StoreRepository::class.java)
 
-    @Bean
-    @Primary
-    fun mockStaffRepository(): StaffRepository = mock(StaffRepository::class.java)
-
     @Bean
     @Primary
     fun mockSettingRepository(): SettingRepository = mock(SettingRepository::class.java)
@@ -51,10 +46,6 @@ class TestConfiguration {
     @Primary
     fun mockStoreService(): StoreService = mock(StoreService::class.java)
 
-    @Bean
-    @Primary
-    fun mockStaffService(): StaffService = mock(StaffService::class.java)
-
     @Bean
     @Primary
     fun mockSettingService(): SettingService = mock(SettingService::class.java)
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/config/OpenApiTestConfiguration.kt b/src/test/kotlin/info/nukoneko/kidspos/server/config/OpenApiTestConfiguration.kt
index 3662b5e..17322d9 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/config/OpenApiTestConfiguration.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/config/OpenApiTestConfiguration.kt
@@ -4,7 +4,6 @@ import info.nukoneko.kidspos.common.service.IdGenerationService
 import info.nukoneko.kidspos.server.service.*
 import info.nukoneko.kidspos.server.service.mapper.ItemMapper
 import info.nukoneko.kidspos.server.service.mapper.SaleMapper
-import info.nukoneko.kidspos.server.service.mapper.StaffMapper
 import info.nukoneko.kidspos.server.service.mapper.StoreMapper
 import org.mockito.Mockito.mock
 import org.springframework.boot.test.context.TestConfiguration
@@ -35,10 +34,6 @@ class OpenApiTestConfiguration {
     @Primary
     fun saleService(): SaleService = mock(SaleService::class.java)
 
-    @Bean
-    @Primary
-    fun staffService(): StaffService = mock(StaffService::class.java)
-
     @Bean
     @Primary
     fun itemMapper(): ItemMapper = mock(ItemMapper::class.java)
@@ -47,10 +42,6 @@ class OpenApiTestConfiguration {
     @Primary
     fun storeMapper(): StoreMapper = mock(StoreMapper::class.java)
 
-    @Bean
-    @Primary
-    fun staffMapper(): StaffMapper = mock(StaffMapper::class.java)
-
     @Bean
     @Primary
     fun saleMapper(): SaleMapper = mock(SaleMapper::class.java)
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerTest.kt
index 74f0aca..05f3f6b 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerTest.kt
@@ -61,7 +61,6 @@ class SaleApiControllerTest {
             SaleEntity(
                 id = 1,
                 storeId = 1,
-                staffId = 1,
                 quantity = 2,
                 amount = 300,
                 deposit = 400,
@@ -81,7 +80,6 @@ class SaleApiControllerTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -99,7 +97,7 @@ class SaleApiControllerTest {
         `when`(itemParsingService.parseItemsFromIds("1,2")).thenReturn(testItems)
         `when`(saleProcessingService.processSaleWithValidation(any(), any()))
             .thenReturn(SaleResult.Success(testSale, summary))
-        `when`(receiptService.printReceipt(any(), any(), any(), any())).thenReturn(true)
+        `when`(receiptService.printReceipt(any(), any(), any())).thenReturn(true)
 
         // When & Then
         mockMvc
@@ -120,7 +118,6 @@ class SaleApiControllerTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 100,
             )
@@ -139,7 +136,7 @@ class SaleApiControllerTest {
 
         verify(itemParsingService).parseItemsFromIds("1,2")
         verify(saleProcessingService).processSaleWithValidation(any(), any())
-        verify(receiptService, never()).printReceipt(any(), any(), any(), any())
+        verify(receiptService, never()).printReceipt(any(), any(), any())
     }
 
     @Test
@@ -148,7 +145,6 @@ class SaleApiControllerTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -175,7 +171,6 @@ class SaleApiControllerTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -204,8 +199,6 @@ class SaleApiControllerTest {
                 id = 1,
                 storeId = 1,
                 storeName = "Store 1",
-                staffId = "STAFF001",
-                staffName = "Test Staff",
                 totalAmount = 300,
                 deposit = 400,
                 change = 100,
@@ -236,8 +229,6 @@ class SaleApiControllerTest {
                 id = 1,
                 storeId = 1,
                 storeName = "Store 1",
-                staffId = "STAFF001",
-                staffName = "Test Staff",
                 totalAmount = 300,
                 deposit = 400,
                 change = 100,
@@ -302,7 +293,6 @@ class SaleApiControllerTest {
             """
             {
                 "storeId": null,
-                "staffBarcode": "",
                 "itemIds": "",
                 "deposit": -100
             }
@@ -323,7 +313,6 @@ class SaleApiControllerTest {
         val invalidRequest =
             CreateSaleRequest(
                 storeId = -1,
-                staffBarcode = "",
                 itemIds = "",
                 deposit = -100,
             )
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerUnitTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerUnitTest.kt
index 7802e43..92c657d 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerUnitTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/SaleApiControllerUnitTest.kt
@@ -44,7 +44,6 @@ class SaleApiControllerUnitTest {
             SaleEntity(
                 id = 1,
                 storeId = 1,
-                staffId = 1,
                 quantity = 2,
                 amount = 300,
                 deposit = 400,
@@ -64,7 +63,6 @@ class SaleApiControllerUnitTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -82,7 +80,6 @@ class SaleApiControllerUnitTest {
         val expectedSaleBean =
             SaleBean(
                 storeId = request.storeId,
-                staffBarcode = request.staffBarcode,
                 itemIds = request.itemIds,
                 deposit = request.deposit,
             )
@@ -90,7 +87,7 @@ class SaleApiControllerUnitTest {
         `when`(itemParsingService.parseItemsFromIds("1,2")).thenReturn(testItems)
         `when`(saleProcessingService.processSaleWithValidation(expectedSaleBean, testItems))
             .thenReturn(SaleResult.Success(testSale, summary))
-        `when`(receiptService.printReceipt(1, testItems, "STAFF001", 400)).thenReturn(true)
+        `when`(receiptService.printReceipt(1, testItems, 400)).thenReturn(true)
 
         // When
         val result = controller.createSale(request)
@@ -108,7 +105,7 @@ class SaleApiControllerUnitTest {
 
         verify(itemParsingService).parseItemsFromIds("1,2")
         verify(saleProcessingService).processSaleWithValidation(expectedSaleBean, testItems)
-        verify(receiptService).printReceipt(1, testItems, "STAFF001", 400)
+        verify(receiptService).printReceipt(1, testItems, 400)
     }
 
     @Test
@@ -117,7 +114,6 @@ class SaleApiControllerUnitTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 100,
             )
@@ -125,7 +121,6 @@ class SaleApiControllerUnitTest {
         val expectedSaleBean =
             SaleBean(
                 storeId = request.storeId,
-                staffBarcode = request.staffBarcode,
                 itemIds = request.itemIds,
                 deposit = request.deposit,
             )
@@ -155,7 +150,6 @@ class SaleApiControllerUnitTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -163,7 +157,6 @@ class SaleApiControllerUnitTest {
         val expectedSaleBean =
             SaleBean(
                 storeId = request.storeId,
-                staffBarcode = request.staffBarcode,
                 itemIds = request.itemIds,
                 deposit = request.deposit,
             )
@@ -193,7 +186,6 @@ class SaleApiControllerUnitTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -222,7 +214,6 @@ class SaleApiControllerUnitTest {
         val request =
             CreateSaleRequest(
                 storeId = 1,
-                staffBarcode = "STAFF001",
                 itemIds = "1,2",
                 deposit = 400,
             )
@@ -230,7 +221,6 @@ class SaleApiControllerUnitTest {
         val expectedSaleBean =
             SaleBean(
                 storeId = request.storeId,
-                staffBarcode = request.staffBarcode,
                 itemIds = request.itemIds,
                 deposit = request.deposit,
             )
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiControllerUnitTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiControllerUnitTest.kt
deleted file mode 100644
index 2ced3c8..0000000
--- a/src/test/kotlin/info/nukoneko/kidspos/server/controller/api/StaffApiControllerUnitTest.kt
+++ /dev/null
@@ -1,78 +0,0 @@
-package info.nukoneko.kidspos.server.controller.api
-
-import info.nukoneko.kidspos.server.domain.exception.ResourceNotFoundException
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import info.nukoneko.kidspos.server.service.StaffService
-import org.junit.jupiter.api.Assertions.assertEquals
-import org.junit.jupiter.api.Assertions.assertNotNull
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.assertThrows
-import org.junit.jupiter.api.extension.ExtendWith
-import org.mockito.InjectMocks
-import org.mockito.Mock
-import org.mockito.Mockito.verify
-import org.mockito.Mockito.`when`
-import org.mockito.junit.jupiter.MockitoExtension
-
-@ExtendWith(MockitoExtension::class)
-class StaffApiControllerUnitTest {
-    @Mock
-    private lateinit var staffService: StaffService
-
-    @InjectMocks
-    private lateinit var controller: StaffApiController
-
-    @Test
-    fun `getStaff should return staff when found`() {
-        // Arrange
-        val barcode = "ST123456"
-        val expectedStaff =
-            StaffEntity(
-                barcode = barcode,
-                name = "Test Staff",
-            )
-        `when`(staffService.findStaff(barcode)).thenReturn(expectedStaff)
-
-        // Act
-        val result = controller.getStaff(barcode)
-
-        // Assert
-        assertNotNull(result)
-        assertEquals(200, result.statusCodeValue)
-        val body = result.body
-        assertNotNull(body)
-        assertEquals(barcode, body?.barcode)
-        assertEquals("Test Staff", body?.name)
-        verify(staffService).findStaff(barcode)
-    }
-
-    @Test
-    fun `getStaff should throw ResourceNotFoundException when staff not found`() {
-        // Arrange
-        val barcode = "NONEXISTENT"
-        `when`(staffService.findStaff(barcode)).thenReturn(null)
-
-        // Act & Assert
-        val exception =
-            assertThrows<ResourceNotFoundException> {
-                controller.getStaff(barcode)
-            }
-        assertEquals("Staff with barcode $barcode not found", exception.message)
-        verify(staffService).findStaff(barcode)
-    }
-
-    @Test
-    fun `getStaff should throw ResourceNotFoundException for empty barcode`() {
-        // Arrange
-        val barcode = ""
-        `when`(staffService.findStaff(barcode)).thenReturn(null)
-
-        // Act & Assert
-        val exception =
-            assertThrows<ResourceNotFoundException> {
-                controller.getStaff(barcode)
-            }
-        assertEquals("Staff with barcode  not found", exception.message)
-        verify(staffService).findStaff(barcode)
-    }
-}
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/repository/QueryOptimizationTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/repository/QueryOptimizationTest.kt
index a1c630c..d08aecd 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/repository/QueryOptimizationTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/repository/QueryOptimizationTest.kt
@@ -81,7 +81,6 @@ class QueryOptimizationTest {
             SaleEntity(
                 id = 1,
                 storeId = 1,
-                staffId = 1,
                 quantity = 3,
                 amount = 300,
                 deposit = 500,
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/repository/SaleRepositoryTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/repository/SaleRepositoryTest.kt
index 57f2584..0581944 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/repository/SaleRepositoryTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/repository/SaleRepositoryTest.kt
@@ -34,7 +34,6 @@ class SaleRepositoryTest {
             SaleEntity(
                 id = 0,
                 storeId = 1,
-                staffId = 1,
                 quantity = 2,
                 amount = 300,
                 deposit = 400,
@@ -44,7 +43,6 @@ class SaleRepositoryTest {
             SaleEntity(
                 id = 0,
                 storeId = 1,
-                staffId = 2,
                 quantity = 3,
                 amount = 500,
                 deposit = 500,
@@ -54,7 +52,6 @@ class SaleRepositoryTest {
             SaleEntity(
                 id = 0,
                 storeId = 2,
-                staffId = 1,
                 quantity = 1,
                 amount = 200,
                 deposit = 300,
@@ -84,7 +81,6 @@ class SaleRepositoryTest {
             SaleEntity(
                 id = 0,
                 storeId = 3,
-                staffId = 3,
                 quantity = 4,
                 amount = 600,
                 deposit = 700,
@@ -233,7 +229,6 @@ class SaleRepositoryTest {
             SaleEntity(
                 id = testSale1.id,
                 storeId = testSale1.storeId,
-                staffId = testSale1.staffId,
                 quantity = testSale1.quantity,
                 amount = 350,
                 deposit = testSale1.deposit,
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/repository/StaffRepositoryTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/repository/StaffRepositoryTest.kt
deleted file mode 100644
index 479f67e..0000000
--- a/src/test/kotlin/info/nukoneko/kidspos/server/repository/StaffRepositoryTest.kt
+++ /dev/null
@@ -1,387 +0,0 @@
-package info.nukoneko.kidspos.server.repository
-
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import org.assertj.core.api.Assertions.assertThat
-import org.junit.jupiter.api.*
-import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase
-import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
-import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager
-import org.springframework.test.context.ActiveProfiles
-
-/**
- * Integration tests for StaffRepository
- *
- * Tests data access layer operations for staff entities using
- * @DataJpaTest annotation for lightweight database testing with
- * automatic rollback after each test.
- *
- * Part of Task 7.2: Repository layer integration tests
- */
-@DataJpaTest
-@ActiveProfiles("test")
-@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
-@DisplayName("StaffRepository Integration Tests")
-@Disabled("Spring context not configured")
-class StaffRepositoryTest {
-    @Autowired
-    private lateinit var staffRepository: StaffRepository
-
-    @Autowired
-    private lateinit var entityManager: TestEntityManager
-
-    @BeforeEach
-    fun setUp() {
-        // Clean up before each test
-        staffRepository.deleteAll()
-        entityManager.flush()
-        entityManager.clear()
-    }
-
-    @Nested
-    @DisplayName("Save Operations")
-    inner class SaveOperations {
-        @Test
-        @DisplayName("Should save new staff member")
-        fun shouldSaveNewStaffMember() {
-            // Given
-            val staff =
-                StaffEntity(
-                    barcode = "STAFF001",
-                    name = "Test Staff",
-                )
-
-            // When
-            val savedStaff = staffRepository.save(staff)
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(savedStaff).isNotNull
-            assertThat(savedStaff.barcode).isEqualTo("STAFF001")
-            assertThat(savedStaff.name).isEqualTo("Test Staff")
-
-            val foundStaff = staffRepository.findById("STAFF001").orElse(null)
-            assertThat(foundStaff).isNotNull
-            assertThat(foundStaff.name).isEqualTo("Test Staff")
-        }
-
-        @Test
-        @DisplayName("Should update existing staff member")
-        fun shouldUpdateExistingStaffMember() {
-            // Given
-            val staff =
-                StaffEntity(
-                    barcode = "STAFF002",
-                    name = "Original Name",
-                )
-            staffRepository.save(staff)
-            entityManager.flush()
-            entityManager.clear()
-
-            // When
-            val updatedStaff =
-                StaffEntity(
-                    barcode = "STAFF002",
-                    name = "Updated Name",
-                )
-            val result = staffRepository.save(updatedStaff)
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(result.name).isEqualTo("Updated Name")
-
-            val foundStaff = staffRepository.findById("STAFF002").orElse(null)
-            assertThat(foundStaff).isNotNull
-            assertThat(foundStaff.name).isEqualTo("Updated Name")
-        }
-
-        @Test
-        @DisplayName("Should save multiple staff members")
-        fun shouldSaveMultipleStaffMembers() {
-            // Given
-            val staffList =
-                listOf(
-                    StaffEntity("STAFF003", "Staff One"),
-                    StaffEntity("STAFF004", "Staff Two"),
-                    StaffEntity("STAFF005", "Staff Three"),
-                )
-
-            // When
-            val savedStaff = staffRepository.saveAll(staffList)
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(savedStaff).hasSize(3)
-            assertThat(staffRepository.count()).isEqualTo(3)
-
-            val allStaff = staffRepository.findAll()
-            assertThat(allStaff).hasSize(3)
-            assertThat(allStaff.map { it.barcode }).containsExactlyInAnyOrder(
-                "STAFF003",
-                "STAFF004",
-                "STAFF005",
-            )
-        }
-    }
-
-    @Nested
-    @DisplayName("Find Operations")
-    inner class FindOperations {
-        @BeforeEach
-        fun setUpTestData() {
-            val staffList =
-                listOf(
-                    StaffEntity("FIND001", "Alice"),
-                    StaffEntity("FIND002", "Bob"),
-                    StaffEntity("FIND003", "Charlie"),
-                )
-            staffRepository.saveAll(staffList)
-            entityManager.flush()
-            entityManager.clear()
-        }
-
-        @Test
-        @DisplayName("Should find staff by barcode")
-        fun shouldFindStaffByBarcode() {
-            // When
-            val staff = staffRepository.findById("FIND002").orElse(null)
-
-            // Then
-            assertThat(staff).isNotNull
-            assertThat(staff.barcode).isEqualTo("FIND002")
-            assertThat(staff.name).isEqualTo("Bob")
-        }
-
-        @Test
-        @DisplayName("Should return empty when staff not found")
-        fun shouldReturnEmptyWhenStaffNotFound() {
-            // When
-            val staff = staffRepository.findById("NONEXISTENT")
-
-            // Then
-            assertThat(staff.isPresent).isFalse
-        }
-
-        @Test
-        @DisplayName("Should find all staff members")
-        fun shouldFindAllStaffMembers() {
-            // When
-            val allStaff = staffRepository.findAll()
-
-            // Then
-            assertThat(allStaff).hasSize(3)
-            assertThat(allStaff.map { it.name }).containsExactlyInAnyOrder(
-                "Alice",
-                "Bob",
-                "Charlie",
-            )
-        }
-
-        @Test
-        @DisplayName("Should check if staff exists by barcode")
-        fun shouldCheckIfStaffExistsByBarcode() {
-            // When & Then
-            assertThat(staffRepository.existsById("FIND001")).isTrue
-            assertThat(staffRepository.existsById("FIND002")).isTrue
-            assertThat(staffRepository.existsById("NONEXISTENT")).isFalse
-        }
-    }
-
-    @Nested
-    @DisplayName("Delete Operations")
-    inner class DeleteOperations {
-        @BeforeEach
-        fun setUpTestData() {
-            val staffList =
-                listOf(
-                    StaffEntity("DEL001", "Staff to Delete 1"),
-                    StaffEntity("DEL002", "Staff to Delete 2"),
-                    StaffEntity("DEL003", "Staff to Keep"),
-                )
-            staffRepository.saveAll(staffList)
-            entityManager.flush()
-            entityManager.clear()
-        }
-
-        @Test
-        @DisplayName("Should delete staff by barcode")
-        fun shouldDeleteStaffByBarcode() {
-            // Given
-            assertThat(staffRepository.existsById("DEL001")).isTrue
-
-            // When
-            staffRepository.deleteById("DEL001")
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(staffRepository.existsById("DEL001")).isFalse
-            assertThat(staffRepository.count()).isEqualTo(2)
-        }
-
-        @Test
-        @DisplayName("Should delete staff entity")
-        fun shouldDeleteStaffEntity() {
-            // Given
-            val staffToDelete = staffRepository.findById("DEL002").orElseThrow()
-
-            // When
-            staffRepository.delete(staffToDelete)
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(staffRepository.existsById("DEL002")).isFalse
-            assertThat(staffRepository.count()).isEqualTo(2)
-        }
-
-        @Test
-        @DisplayName("Should delete all staff")
-        fun shouldDeleteAllStaff() {
-            // Given
-            assertThat(staffRepository.count()).isEqualTo(3)
-
-            // When
-            staffRepository.deleteAll()
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(staffRepository.count()).isEqualTo(0)
-            assertThat(staffRepository.findAll()).isEmpty()
-        }
-
-        @Test
-        @DisplayName("Should handle delete non-existent staff gracefully")
-        fun shouldHandleDeleteNonExistentStaffGracefully() {
-            // When - delete non-existent entity (JPA throws EmptyResultDataAccessException)
-            try {
-                staffRepository.deleteById("NONEXISTENT")
-                entityManager.flush()
-            } catch (e: Exception) {
-                // Expected - JPA throws exception for non-existent entities
-                // This is standard JPA behavior
-            }
-
-            // Then - Verify other data is intact
-            assertThat(staffRepository.count()).isEqualTo(3)
-        }
-    }
-
-    @Nested
-    @DisplayName("Batch Operations")
-    inner class BatchOperations {
-        @Test
-        @DisplayName("Should count staff correctly")
-        fun shouldCountStaffCorrectly() {
-            // Given
-            assertThat(staffRepository.count()).isEqualTo(0)
-
-            // When
-            staffRepository.saveAll(
-                listOf(
-                    StaffEntity("COUNT001", "Staff 1"),
-                    StaffEntity("COUNT002", "Staff 2"),
-                    StaffEntity("COUNT003", "Staff 3"),
-                ),
-            )
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(staffRepository.count()).isEqualTo(3)
-        }
-
-        @Test
-        @DisplayName("Should delete batch by IDs")
-        fun shouldDeleteBatchByIds() {
-            // Given
-            staffRepository.saveAll(
-                listOf(
-                    StaffEntity("BATCH001", "Staff 1"),
-                    StaffEntity("BATCH002", "Staff 2"),
-                    StaffEntity("BATCH003", "Staff 3"),
-                    StaffEntity("BATCH004", "Staff 4"),
-                ),
-            )
-            entityManager.flush()
-            entityManager.clear()
-
-            // When
-            val toDelete =
-                listOf(
-                    StaffEntity("BATCH001", "Staff 1"),
-                    StaffEntity("BATCH003", "Staff 3"),
-                )
-            staffRepository.deleteAll(toDelete)
-            entityManager.flush()
-            entityManager.clear()
-
-            // Then
-            assertThat(staffRepository.count()).isEqualTo(2)
-            assertThat(staffRepository.existsById("BATCH002")).isTrue
-            assertThat(staffRepository.existsById("BATCH004")).isTrue
-        }
-
-        @Test
-        @DisplayName("Should find all by IDs")
-        fun shouldFindAllByIds() {
-            // Given
-            staffRepository.saveAll(
-                listOf(
-                    StaffEntity("FINDALL001", "Staff A"),
-                    StaffEntity("FINDALL002", "Staff B"),
-                    StaffEntity("FINDALL003", "Staff C"),
-                    StaffEntity("FINDALL004", "Staff D"),
-                ),
-            )
-            entityManager.flush()
-            entityManager.clear()
-
-            // When
-            val idsToFind = listOf("FINDALL001", "FINDALL003", "FINDALL004", "NONEXISTENT")
-            val foundStaff = staffRepository.findAllById(idsToFind)
-
-            // Then
-            assertThat(foundStaff).hasSize(3)
-            assertThat(foundStaff.map { it.barcode }).containsExactlyInAnyOrder(
-                "FINDALL001",
-                "FINDALL003",
-                "FINDALL004",
-            )
-        }
-    }
-
-    @Nested
-    @DisplayName("Transaction and Rollback")
-    inner class TransactionTests {
-        @Test
-        @DisplayName("Should rollback transaction on failure")
-        fun shouldRollbackTransactionOnFailure() {
-            // Given
-            val initialCount = staffRepository.count()
-
-            // When - Simulate a transaction that fails
-            try {
-                staffRepository.save(StaffEntity("TRANS001", "Transaction Test"))
-                entityManager.flush()
-
-                // Force a constraint violation or exception
-                // This would normally be done in a @Transactional method
-                staffRepository.save(StaffEntity("TRANS001", "Duplicate")) // Same ID
-                entityManager.flush()
-            } catch (e: Exception) {
-                // Expected exception
-                entityManager.clear()
-            }
-
-            // Then - Verify rollback (in real scenario with proper transaction management)
-            // Note: @DataJpaTest automatically rolls back each test
-            val finalCount = staffRepository.count()
-            assertThat(finalCount).isEqualTo(initialCount + 1) // Only first save persisted
-        }
-    }
-}
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/service/ReceiptServiceTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/service/ReceiptServiceTest.kt
index 1270860..c258c3d 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/service/ReceiptServiceTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/service/ReceiptServiceTest.kt
@@ -2,7 +2,6 @@ package info.nukoneko.kidspos.server.service
 
 import info.nukoneko.kidspos.server.config.AppProperties
 import info.nukoneko.kidspos.server.controller.dto.request.ItemBean
-import info.nukoneko.kidspos.server.entity.StaffEntity
 import info.nukoneko.kidspos.server.entity.StoreEntity
 import org.junit.jupiter.api.Assertions.*
 import org.junit.jupiter.api.BeforeEach
@@ -19,9 +18,6 @@ class ReceiptServiceTest {
     @MockBean
     private lateinit var storeService: StoreService
 
-    @MockBean
-    private lateinit var staffService: StaffService
-
     @MockBean
     private lateinit var appProperties: AppProperties
 
@@ -29,7 +25,7 @@ class ReceiptServiceTest {
 
     @BeforeEach
     fun setup() {
-        receiptService = ReceiptService(storeService, staffService, appProperties)
+        receiptService = ReceiptService(storeService, appProperties)
 
         // Mock AppProperties - skip for now due to complexity
     }
@@ -92,7 +88,6 @@ class ReceiptServiceTest {
     fun `should generate receipt content with proper formatting`() {
         // Given
         val storeId = 1
-        val staffBarcode = "STAFF001"
         val deposit = 1000
         val items =
             listOf(
@@ -101,32 +96,27 @@ class ReceiptServiceTest {
             )
 
         val store = StoreEntity(storeId, "Test Store", "192.168.1.100")
-        val staff = StaffEntity(staffBarcode, "Test Staff")
 
         `when`(storeService.findStore(storeId)).thenReturn(store)
-        `when`(staffService.findStaff(staffBarcode)).thenReturn(staff)
 
         // When
-        val result = receiptService.generateReceiptContent(storeId, items, staffBarcode, deposit)
+        val result = receiptService.generateReceiptContent(storeId, items, deposit)
 
         // Then
         assertNotNull(result)
         assertTrue(result.contains("Test Store"))
-        assertTrue(result.contains("Test Staff"))
         assertTrue(result.contains("Item 1 - 300リバー"))
         assertTrue(result.contains("Item 2 - 400リバー"))
         assertTrue(result.contains("Total: 700リバー"))
         assertTrue(result.contains("Deposit: 1000リバー"))
         assertTrue(result.contains("Change: 300リバー"))
         verify(storeService).findStore(storeId)
-        verify(staffService).findStaff(staffBarcode)
     }
 
     @Test
     fun `should generate receipt content with unknown store and staff`() {
         // Given
         val storeId = 999
-        val staffBarcode = "UNKNOWN"
         val deposit = 500
         val items =
             listOf(
@@ -134,39 +124,33 @@ class ReceiptServiceTest {
             )
 
         `when`(storeService.findStore(storeId)).thenReturn(null)
-        `when`(staffService.findStaff(staffBarcode)).thenReturn(null)
 
         // When
-        val result = receiptService.generateReceiptContent(storeId, items, staffBarcode, deposit)
+        val result = receiptService.generateReceiptContent(storeId, items, deposit)
 
         // Then
         assertNotNull(result)
         assertTrue(result.contains("Unknown Store"))
-        assertTrue(result.contains("Unknown Staff"))
         assertTrue(result.contains("Test Item - 200リバー"))
         assertTrue(result.contains("Total: 200リバー"))
         assertTrue(result.contains("Deposit: 500リバー"))
         assertTrue(result.contains("Change: 300リバー"))
         verify(storeService).findStore(storeId)
-        verify(staffService).findStaff(staffBarcode)
     }
 
     @Test
     fun `should handle empty items list in receipt generation`() {
         // Given
         val storeId = 1
-        val staffBarcode = "STAFF001"
         val deposit = 100
         val items = emptyList<ItemBean>()
 
         val store = StoreEntity(storeId, "Test Store", "192.168.1.100")
-        val staff = StaffEntity(staffBarcode, "Test Staff")
 
         `when`(storeService.findStore(storeId)).thenReturn(store)
-        `when`(staffService.findStaff(staffBarcode)).thenReturn(staff)
 
         // When
-        val result = receiptService.generateReceiptContent(storeId, items, staffBarcode, deposit)
+        val result = receiptService.generateReceiptContent(storeId, items, deposit)
 
         // Then
         assertNotNull(result)
@@ -174,6 +158,5 @@ class ReceiptServiceTest {
         assertTrue(result.contains("Deposit: 100リバー"))
         assertTrue(result.contains("Change: 100リバー"))
         verify(storeService).findStore(storeId)
-        verify(staffService).findStaff(staffBarcode)
     }
 }
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/service/SaleProcessingServiceTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/service/SaleProcessingServiceTest.kt
index 2d857ce..adcd150 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/service/SaleProcessingServiceTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/service/SaleProcessingServiceTest.kt
@@ -40,7 +40,7 @@ class SaleProcessingServiceTest {
     @Test
     fun `should process sale with multiple items correctly`() {
         // Given
-        val saleBean = SaleBean(storeId = 1, staffBarcode = "1001", itemIds = "1,2,3", deposit = 1000)
+        val saleBean = SaleBean(storeId = 1, itemIds = "1,2,3", deposit = 1000)
         val items =
             listOf(
                 ItemBean(1, "001", "Item 1", 300),
@@ -52,7 +52,6 @@ class SaleProcessingServiceTest {
             SaleEntity(
                 id = 1,
                 storeId = 1,
-                staffId = 1,
                 quantity = 3,
                 amount = 900,
                 deposit = 1000,
@@ -90,7 +89,7 @@ class SaleProcessingServiceTest {
     @Test
     fun `should handle duplicate items correctly`() {
         // Given
-        val saleBean = SaleBean(storeId = 1, staffBarcode = "1001", itemIds = "1,1,2", deposit = 800)
+        val saleBean = SaleBean(storeId = 1, itemIds = "1,1,2", deposit = 800)
         val items =
             listOf(
                 ItemBean(1, "001", "Item 1", 300),
@@ -204,7 +203,7 @@ class SaleValidationServiceTest {
     @Test
     fun `should validate valid sale request`() {
         // Given
-        val saleBean = SaleBean(storeId = 1, staffBarcode = "1001", itemIds = "1,2", deposit = 500)
+        val saleBean = SaleBean(storeId = 1, itemIds = "1,2", deposit = 500)
         val items =
             listOf(
                 ItemBean(1, "001", "Item 1", 200),
@@ -220,7 +219,7 @@ class SaleValidationServiceTest {
     @Test
     fun `should throw exception for insufficient deposit`() {
         // Given
-        val saleBean = SaleBean(storeId = 1, staffBarcode = "1001", itemIds = "1,2", deposit = 300)
+        val saleBean = SaleBean(storeId = 1, itemIds = "1,2", deposit = 300)
         val items =
             listOf(
                 ItemBean(1, "001", "Item 1", 200),
@@ -236,7 +235,7 @@ class SaleValidationServiceTest {
     @Test
     fun `should throw exception for empty items`() {
         // Given
-        val saleBean = SaleBean(storeId = 1, staffBarcode = "1001", itemIds = "", deposit = 1000)
+        val saleBean = SaleBean(storeId = 1, itemIds = "", deposit = 1000)
         val items = emptyList<ItemBean>()
 
         // When & Then
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/service/StaffServiceTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/service/StaffServiceTest.kt
deleted file mode 100644
index 48b2dad..0000000
--- a/src/test/kotlin/info/nukoneko/kidspos/server/service/StaffServiceTest.kt
+++ /dev/null
@@ -1,118 +0,0 @@
-package info.nukoneko.kidspos.server.service
-
-import info.nukoneko.kidspos.server.entity.StaffEntity
-import info.nukoneko.kidspos.server.repository.StaffRepository
-import org.junit.jupiter.api.Assertions.*
-import org.junit.jupiter.api.BeforeEach
-import org.junit.jupiter.api.Disabled
-import org.junit.jupiter.api.Test
-import org.mockito.Mockito.verify
-import org.mockito.Mockito.`when`
-import org.springframework.boot.test.context.SpringBootTest
-import org.springframework.boot.test.mock.mockito.MockBean
-import java.util.*
-
-@SpringBootTest
-@Disabled("Spring context not configured")
-class StaffServiceTest {
-    @MockBean
-    private lateinit var staffRepository: StaffRepository
-
-    private lateinit var staffService: StaffService
-
-    @BeforeEach
-    fun setup() {
-        staffService = StaffService(staffRepository)
-    }
-
-    @Test
-    fun `should find staff by barcode when staff exists`() {
-        // Given
-        val barcode = "STAFF001"
-        val expectedStaff =
-            StaffEntity(
-                barcode = barcode,
-                name = "Test Staff",
-            )
-        `when`(staffRepository.findById(barcode)).thenReturn(Optional.of(expectedStaff))
-
-        // When
-        val result = staffService.findStaff(barcode)
-
-        // Then
-        assertNotNull(result)
-        assertEquals(barcode, result?.barcode)
-        assertEquals("Test Staff", result?.name)
-        verify(staffRepository).findById(barcode)
-    }
-
-    @Test
-    fun `should return null when staff does not exist by barcode`() {
-        // Given
-        val barcode = "NONEXISTENT"
-        `when`(staffRepository.findById(barcode)).thenReturn(Optional.empty())
-
-        // When
-        val result = staffService.findStaff(barcode)
-
-        // Then
-        assertNull(result)
-        verify(staffRepository).findById(barcode)
-    }
-
-    @Test
-    fun `should find all staff`() {
-        // Given
-        val expectedStaff =
-            listOf(
-                StaffEntity(barcode = "STAFF001", name = "Staff Member 1"),
-                StaffEntity(barcode = "STAFF002", name = "Staff Member 2"),
-            )
-        `when`(staffRepository.findAll()).thenReturn(expectedStaff)
-
-        // When
-        val result = staffService.findAll()
-
-        // Then
-        assertNotNull(result)
-        assertEquals(2, result.size)
-        assertEquals("Staff Member 1", result[0].name)
-        assertEquals("Staff Member 2", result[1].name)
-        verify(staffRepository).findAll()
-    }
-
-    @Test
-    fun `should handle empty staff list`() {
-        // Given
-        `when`(staffRepository.findAll()).thenReturn(emptyList())
-
-        // When
-        val result = staffService.findAll()
-
-        // Then
-        assertNotNull(result)
-        assertTrue(result.isEmpty())
-        verify(staffRepository).findAll()
-    }
-
-    @Test
-    fun `should handle special characters in barcode`() {
-        // Given
-        val barcodeWithSpecialChars = "STAFF-001_TEST"
-        val expectedStaff =
-            StaffEntity(
-                barcode = barcodeWithSpecialChars,
-                name = "Special Staff",
-            )
-        `when`(staffRepository.findById(barcodeWithSpecialChars)).thenReturn(Optional.of(expectedStaff))
-
-        // When
-        val result = staffService.findStaff(barcodeWithSpecialChars)
-
-        // Then
-        assertNotNull(result)
-        assertEquals(barcodeWithSpecialChars, result?.barcode)
-        assertEquals("Special Staff", result?.name)
-        verify(staffRepository).findById(barcodeWithSpecialChars)
-    }
-}
diff --git a/src/test/kotlin/info/nukoneko/kidspos/server/service/ValidationServiceUnitTest.kt b/src/test/kotlin/info/nukoneko/kidspos/server/service/ValidationServiceUnitTest.kt
index 7b0b715..a067b35 100644
--- a/src/test/kotlin/info/nukoneko/kidspos/server/service/ValidationServiceUnitTest.kt
+++ b/src/test/kotlin/info/nukoneko/kidspos/server/service/ValidationServiceUnitTest.kt
@@ -2,7 +2,6 @@ package info.nukoneko.kidspos.server.service
 
 import info.nukoneko.kidspos.server.domain.exception.ValidationException
 import info.nukoneko.kidspos.server.repository.ItemRepository
-import info.nukoneko.kidspos.server.repository.StaffRepository
 import info.nukoneko.kidspos.server.repository.StoreRepository
 import org.junit.jupiter.api.Assertions.assertDoesNotThrow
 import org.junit.jupiter.api.Assertions.assertEquals
@@ -23,9 +22,6 @@ class ValidationServiceUnitTest {
     @Mock
     private lateinit var storeRepository: StoreRepository
 
-    @Mock
-    private lateinit var staffRepository: StaffRepository
-
     @InjectMocks
     private lateinit var validationService: ValidationService
 
diff --git a/tests/vrt/pages.spec.ts b/tests/vrt/pages.spec.ts
index 1e3fc74..7ec3433 100644
--- a/tests/vrt/pages.spec.ts
+++ b/tests/vrt/pages.spec.ts
@@ -36,15 +36,6 @@ test.describe('Visual Regression Tests', () => {
     });
   });
 
-  test('Staff Management Page', async ({ page }) => {
-    await page.goto('/staffs');
-    await page.waitForSelector('h1');
-
-    await expect(page).toHaveScreenshot('staff-page.png', {
-      fullPage: true,
-      animations: 'disabled',
-    });
-  });
 
   test('Sales Report Page', async ({ page }) => {
     await page.goto('/reports/sales');
@@ -119,4 +110,4 @@ test.describe('Interactive Elements', () => {
       animations: 'disabled',
     });
   });
-});
\ No newline at end of file
+});
diff --git a/tests/vrt/pages.spec.ts-snapshots/homepage-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/homepage-chromium-linux.png
index db4bd81..eba8083 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/homepage-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/homepage-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/items-page-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/items-page-chromium-linux.png
index dabfffc..abb75b4 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/items-page-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/items-page-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/mobile-homepage-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/mobile-homepage-chromium-linux.png
index 156dbee..b738954 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/mobile-homepage-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/mobile-homepage-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/mobile-sales-report-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/mobile-sales-report-chromium-linux.png
index 49da595..950c90f 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/mobile-sales-report-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/mobile-sales-report-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/sales-page-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/sales-page-chromium-linux.png
index aa041ea..a79f94c 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/sales-page-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/sales-page-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/sales-report-page-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/sales-report-page-chromium-linux.png
index 7dc68ba..92aae18 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/sales-report-page-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/sales-report-page-chromium-linux.png differ
diff --git a/tests/vrt/pages.spec.ts-snapshots/stores-page-chromium-linux.png b/tests/vrt/pages.spec.ts-snapshots/stores-page-chromium-linux.png
index 1304a51..26477e4 100644
Binary files a/tests/vrt/pages.spec.ts-snapshots/stores-page-chromium-linux.png and b/tests/vrt/pages.spec.ts-snapshots/stores-page-chromium-linux.png differ