docs: move IMPLEMENTATION_PLAN.md to docs/plans directory

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

docs/plans/IMPLEMENTATION_PLAN.md

@@ -0,0 +1,130 @@
+# Implementation Plan: Auto-import Extracted Data to Database
+
+## Overview
+
+Implement automatic database import after ERP data extraction completes. The merged Excel file will be read and written to the `dbo_DiscreteMaterialPlanData` table.
+
+## Requirements
+
+- **Trigger**: Automatic after extraction completes
+- **Delete Strategy**: Batch delete by `SourceNumber` before insert
+- **Batch Insert**: 1000 records per batch
+- **Field Mapping**: 28 Excel fields → database columns (skip 打印人, 打印日期, BOMVersion)
+
+## Architecture
+
+```
+ExtractorService
+    │
+    ├── extract() → download + merge Excel
+    │
+    └── NEW: importToDatabase(mergedFile)
+            │
+            ▼
+        DataImportService
+            │
+            ├── readExcelFile() → records + sourceNumbers
+            ├── deleteExistingRecords(sourceNumbers)
+            └── batchInsert(records, batchSize=1000)
+                    │
+                    ▼
+                DiscreteMaterialPlanDAO
+                    ├── deleteBySourceNumbers()
+                    └── batchInsert()
+```
+
+## Field Mapping
+
+| Excel Header | Database Column          | Notes            |
+| ------------ | ------------------------ | ---------------- |
+| 工厂         | Factory                  |                  |
+| 备料状态     | MaterialStatus           |                  |
+| 备料计划单号 | PlanNumber               |                  |
+| 来源单号     | SourceNumber             | **Deletion key** |
+| 备料类型     | MaterialType             |                  |
+| 产品编码     | ProductCode              |                  |
+| 产品名称     | ProductName              |                  |
+| 产品计划数量 | ProductPlanQuantity      | decimal          |
+| 产品单位     | ProductUnit              |                  |
+| 用料部门     | UseDepartment            |                  |
+| 备注         | Remark                   |                  |
+| 制单人       | Creator                  |                  |
+| 制单日期     | CreateDate               | date             |
+| 审批人       | Approver                 |                  |
+| 审批日期     | ApproveDate              | date             |
+| 序号         | SequenceNumber           | int              |
+| 材料编码     | MaterialCode             |                  |
+| 材料名称     | MaterialName             |                  |
+| 规格         | Specification            |                  |
+| 型号         | Model                    |                  |
+| 图号         | DrawingNumber            |                  |
+| 物料材质     | MaterialQuality          |                  |
+| 计划数量     | PlanQuantity             | decimal          |
+| 单位         | Unit                     |                  |
+| 需用日期     | RequiredDate             | date             |
+| 发料仓库     | Warehouse                |                  |
+| 单位用量     | UnitUsage                | decimal          |
+| 累计出库数量 | CumulativeOutputQuantity | decimal          |
+| 打印人       | ❌ SKIP                  | Not in DB        |
+| 打印日期     | ❌ SKIP                  | Not in DB        |
+| -            | BOMVersion               | SKIP (no source) |
+
+## Files to Create/Modify
+
+### 1. NEW: `src/main/services/database/data-importer.ts`
+
+Main import service with:
+
+- `importFromExcel(filePath)` - Main entry point
+- `readExcelFile(filePath)` - Parse Excel using ExcelJS
+- Map Excel columns to database fields
+- Return records and unique SourceNumbers
+
+### 2. MODIFY: `src/main/services/database/discrete-material-plan-dao.ts`
+
+Add methods:
+
+- `deleteBySourceNumbers(sourceNumbers: string[])` - Batch delete
+- `batchInsert(records: MaterialPlanRecord[], batchSize: number)` - Batch insert
+
+### 3. MODIFY: `src/main/services/erp/extractor.ts`
+
+- After successful merge, call `importToDatabase(mergedFile)`
+- Add import results to `ExtractorResult`
+
+### 4. MODIFY: `src/main/types/extractor.types.ts`
+
+Add types:
+
+```typescript
+export interface ImportResult {
+  success: boolean
+  recordsImported: number
+  recordsDeleted: number
+  errors: string[]
+}
+
+export interface ExtractorResult {
+  // existing fields...
+  importResult?: ImportResult
+}
+```
+
+### 5. MODIFY: `src/renderer/src/pages/ExtractorPage.tsx`
+
+- Display import results
+- Show records deleted/imported counts
+
+## Implementation Order
+
+1. Extend `DiscreteMaterialPlanDAO` with insert/delete methods
+2. Create `DataImportService`
+3. Integrate into `ExtractorService`
+4. Update types
+5. Update UI
+
+## Testing Plan
+
+1. Unit test DAO methods
+2. Integration test with sample Excel file
+3. E2E test extraction → import flow