Phase 5: 实体属性扩展功能

- 数据库层:
  - 新增 entity_attributes 表存储自定义属性
  - 新增 attribute_templates 表管理属性模板
  - 新增 attribute_history 表记录属性变更历史

- 后端 API:
  - GET/POST /api/v1/projects/{id}/attribute-templates - 属性模板管理
  - GET/POST/PUT/DELETE /api/v1/entities/{id}/attributes - 实体属性 CRUD
  - GET /api/v1/entities/{id}/attributes/history - 属性变更历史
  - GET /api/v1/projects/{id}/entities/search-by-attributes - 属性筛选搜索

- 前端 UI:
  - 实体详情面板添加属性展示
  - 属性编辑表单（支持文本、数字、日期、单选、多选）
  - 属性模板管理界面
  - 属性变更历史查看
  - 知识库实体卡片显示属性预览
  - 属性筛选搜索栏

backend/schema.sql

@@ -75,6 +75,94 @@ CREATE TABLE IF NOT EXISTS glossary (
     FOREIGN KEY (project_id) REFERENCES projects(id)
 );
 
+-- Phase 5: 属性模板表
+CREATE TABLE IF NOT EXISTS attribute_templates (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    name TEXT NOT NULL,
+    type TEXT NOT NULL,  -- text/number/date/select/multiselect
+    description TEXT,
+    options TEXT,  -- JSON 数组，用于 select/multiselect 类型
+    is_required INTEGER DEFAULT 0,
+    default_value TEXT,
+    sort_order INTEGER DEFAULT 0,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (project_id) REFERENCES projects(id)
+);
+
+-- Phase 5: 实体属性值表
+CREATE TABLE IF NOT EXISTS entity_attributes (
+    id TEXT PRIMARY KEY,
+    entity_id TEXT NOT NULL,
+    template_id TEXT,
+    name TEXT NOT NULL,
+    type TEXT NOT NULL,  -- text/number/date/select/multiselect
+    value TEXT,  -- 存储实际值
+    options TEXT,  -- JSON 数组，用于 select/multiselect
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (entity_id) REFERENCES entities(id) ON DELETE CASCADE,
+    FOREIGN KEY (template_id) REFERENCES attribute_templates(id) ON DELETE SET NULL,
+    UNIQUE(entity_id, name)
+);
+
+-- Phase 5: 属性变更历史表
+CREATE TABLE IF NOT EXISTS attribute_history (
+    id TEXT PRIMARY KEY,
+    entity_id TEXT NOT NULL,
+    attribute_name TEXT NOT NULL,
+    old_value TEXT,
+    new_value TEXT,
+    changed_by TEXT,  -- 用户ID或系统
+    changed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    change_reason TEXT,
+    FOREIGN KEY (entity_id) REFERENCES entities(id) ON DELETE CASCADE
+);
+
+-- Phase 5: 属性模板表（项目级自定义属性定义）
+CREATE TABLE IF NOT EXISTS attribute_templates (
+    id TEXT PRIMARY KEY,
+    project_id TEXT NOT NULL,
+    name TEXT NOT NULL,  -- 属性名称，如"年龄"、"职位"
+    type TEXT NOT NULL,  -- 属性类型: text, number, date, select, multiselect, boolean
+    options TEXT,  -- JSON 数组，用于 select/multiselect 类型
+    default_value TEXT,  -- 默认值
+    description TEXT,  -- 属性描述
+    is_required BOOLEAN DEFAULT 0,  -- 是否必填
+    display_order INTEGER DEFAULT 0,  -- 显示顺序
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (project_id) REFERENCES projects(id)
+);
+
+-- Phase 5: 实体属性值表
+CREATE TABLE IF NOT EXISTS entity_attributes (
+    id TEXT PRIMARY KEY,
+    entity_id TEXT NOT NULL,
+    template_id TEXT NOT NULL,
+    value TEXT,  -- 属性值（以JSON或字符串形式存储）
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (entity_id) REFERENCES entities(id) ON DELETE CASCADE,
+    FOREIGN KEY (template_id) REFERENCES attribute_templates(id) ON DELETE CASCADE,
+    UNIQUE(entity_id, template_id)  -- 每个实体每个属性只能有一个值
+);
+
+-- Phase 5: 属性变更历史表
+CREATE TABLE IF NOT EXISTS attribute_history (
+    id TEXT PRIMARY KEY,
+    entity_id TEXT NOT NULL,
+    template_id TEXT NOT NULL,
+    old_value TEXT,
+    new_value TEXT,
+    changed_by TEXT,  -- 用户ID或"system"
+    changed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    change_reason TEXT,  -- 变更原因
+    FOREIGN KEY (entity_id) REFERENCES entities(id) ON DELETE CASCADE,
+    FOREIGN KEY (template_id) REFERENCES attribute_templates(id) ON DELETE CASCADE
+);
+
 -- 创建索引以提高查询性能
 CREATE INDEX IF NOT EXISTS idx_entities_project ON entities(project_id);
 CREATE INDEX IF NOT EXISTS idx_entities_name ON entities(name);
@@ -83,3 +171,15 @@ CREATE INDEX IF NOT EXISTS idx_mentions_entity ON entity_mentions(entity_id);
 CREATE INDEX IF NOT EXISTS idx_mentions_transcript ON entity_mentions(transcript_id);
 CREATE INDEX IF NOT EXISTS idx_relations_project ON entity_relations(project_id);
 CREATE INDEX IF NOT EXISTS idx_glossary_project ON glossary(project_id);
+
+-- Phase 5: 属性相关索引
+CREATE INDEX IF NOT EXISTS idx_attr_templates_project ON attribute_templates(project_id);
+CREATE INDEX IF NOT EXISTS idx_entity_attributes_entity ON entity_attributes(entity_id);
+CREATE INDEX IF NOT EXISTS idx_entity_attributes_template ON entity_attributes(template_id);
+CREATE INDEX IF NOT EXISTS idx_attr_history_entity ON attribute_history(entity_id);
+
+-- Phase 5: 属性相关索引
+CREATE INDEX IF NOT EXISTS idx_attr_templates_project ON attribute_templates(project_id);
+CREATE INDEX IF NOT EXISTS idx_entity_attributes_entity ON entity_attributes(entity_id);
+CREATE INDEX IF NOT EXISTS idx_entity_attributes_template ON entity_attributes(template_id);
+CREATE INDEX IF NOT EXISTS idx_attr_history_entity ON attribute_history(entity_id);