# 领域模型与数据字典 (Domain Model & Data Dictionary)

## 1. 核心实体 (Core Entities)
- **Project**：项目主实体，贯穿全生命周期
- **Notice**：公告类数据（招标/采购/结果/更正）
- **Tender**：招标标段或包件
- **Award**：中标结果
- **Contract**：合同与履约记录
- **Organization**：采购方/供应商/代理机构
- **Person/Expert**：评标专家（若可获取）
- **Source**：数据源
- **User/Role**：用户与权限
- **Subscription**：订阅与推送策略
- **Attachment**：公告附件与标书

## 2. 关系概览 (Relations)
- Project 1..N Notice
- Project 1..N Tender
- Tender 0..1 Award
- Award 0..1 Contract
- Organization 与 Project/Tender/Award 多对多
- User 1..N Subscription

## 3. 数据字典 (Key Fields)
### 3.1 Project
- `project_id` (UUID)
- `project_name`
- `project_code` (招标编号)
- `project_stage` (intent/notice/prequal/award/contract/fulfillment)
- `budget_amount`、`currency`
- `region_code`、`industry_code`
- `buyer_org_id`
- `start_date`、`end_date`

### 3.2 Notice
- `notice_id`
- `notice_type` (tender/award/correction/intent)
- `publish_time`
- `title`
- `content_raw`
- `attachments` (list)
- `source_id`、`source_url`

### 3.3 Tender
- `tender_id`
- `tender_name`
- `package_no`
- `qualification_requirements`
- `bid_open_time`
- `bid_deadline`

### 3.4 Award
- `award_id`
- `winner_org_id`
- `award_amount`
- `award_time`
- `evaluation_method`

### 3.5 Contract
- `contract_id`
- `contract_amount`
- `sign_date`
- `delivery_deadline`
- `performance_status`

### 3.6 Organization
- `org_id`
- `org_name`
- `org_type` (buyer/supplier/agency)
- `credit_code` (统一社会信用代码)
- `region_code`
- `contact_phone` (脱敏)

### 3.7 Subscription
- `subscription_id`
- `user_id`
- `keywords`、`regions`、`industries`
- `channels` (email/sms/wecom)
- `schedule` (realtime/daily/weekly)

### 3.8 Source
- `source_id`
- `source_name`
- `source_type`
- `access_method`
- `update_frequency`

## 4. 统一分类体系
- 行业分类：支持 2~4 级，兼容国家标准行业分类
- 地区分类：省/市/区三级行政区划
- 采购方式：公开招标/邀请招标/竞争性谈判/询价等