fix: 添加 PortfolioNavHistory 到 CodeFirst 初始化，删除手动迁移脚本

- DatabaseService.InitializeDatabase() 添加 PortfolioNavHistory
- 删除 migrations/ 目录，使用 CodeFirst 自动建表

AssetManager.Data/DatabaseService.cs

@@ -21,7 +21,8 @@ public class DatabaseService
             typeof(Transaction),
             typeof(TiingoTicker),
             typeof(MarketPriceCache),
-            typeof(MarketKlineCache)
+            typeof(MarketKlineCache),
+            typeof(PortfolioNavHistory)
         );
     }
 

AssetManager.Data/Strategy.cs

@@ -53,7 +53,7 @@ public class Strategy
     /// <summary>
     /// 策略配置项(周期,阈值,资产配比)
     /// </summary>
-    [SugarColumn(ColumnName = "config", IsJson = true)]
+    [SugarColumn(ColumnName = "config", ColumnDataType = "text")]
     public string? Config { get; set; }
     
     /// <summary>

AssetManager.Services/StrategyService.cs

@@ -1,6 +1,7 @@
 using AssetManager.Data;
 using AssetManager.Models.DTOs;
 using SqlSugar;
+using System.Text.Json;
 
 namespace AssetManager.Services;
 
@@ -24,7 +25,7 @@ public class StrategyService : IStrategyService
             Description = request.description,
             Tags = request.tags != null ? string.Join(",", request.tags) : null,
             RiskLevel = request.riskLevel,
-            Config = request.parameters != null ? System.Text.Json.JsonSerializer.Serialize(request.parameters) : null,
+            Config = request.parameters != null ? JsonSerializer.Serialize(request.parameters) : null,
             CreatedAt = DateTime.Now,
             UpdatedAt = DateTime.Now
         };
@@ -63,7 +64,7 @@ public class StrategyService : IStrategyService
         strategy.Description = request.description;
         strategy.Tags = request.tags != null ? string.Join(",", request.tags) : null;
         strategy.RiskLevel = request.riskLevel;
-        strategy.Config = request.parameters != null ? System.Text.Json.JsonSerializer.Serialize(request.parameters) : null;
+        strategy.Config = request.parameters != null ? JsonSerializer.Serialize(request.parameters) : null;
         strategy.UpdatedAt = DateTime.Now;
 
         _db.Updateable(strategy).ExecuteCommand();

migrations/001_create_nav_history_table.sql

@@ -1,34 +0,0 @@
--- =============================================
--- 净值历史表迁移脚本
--- 创建时间: 2026-03-13
--- 说明: 用于记录组合每日净值和收益数据
--- =============================================
-
--- 创建净值历史表
-CREATE TABLE IF NOT EXISTS portfolio_nav_history (
-    id VARCHAR(50) PRIMARY KEY COMMENT '主键ID',
-    portfolio_id VARCHAR(50) NOT NULL COMMENT '组合ID',
-    nav_date DATE NOT NULL COMMENT '净值日期',
-    total_value DECIMAL(18,4) DEFAULT 0 COMMENT '总资产价值（本位币）',
-    total_cost DECIMAL(18,4) DEFAULT 0 COMMENT '累计投入成本（本位币）',
-    nav DECIMAL(18,8) DEFAULT 1.0 COMMENT '单位净值',
-    daily_return DECIMAL(10,4) DEFAULT 0 COMMENT '日收益率（%）',
-    cumulative_return DECIMAL(10,4) DEFAULT 0 COMMENT '累计收益率（%）',
-    currency VARCHAR(10) DEFAULT 'CNY' COMMENT '本位币',
-    position_count INT DEFAULT 0 COMMENT '持仓数量',
-    source VARCHAR(20) DEFAULT 'calculated' COMMENT '数据来源',
-    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='组合净值历史表';
-
--- 创建组合日期联合索引
-CREATE INDEX idx_portfolio_date ON portfolio_nav_history(portfolio_id, nav_date);
-
--- 创建唯一约束（同一组合同一天只能有一条记录）
-ALTER TABLE portfolio_nav_history ADD CONSTRAINT uk_portfolio_date UNIQUE(portfolio_id, nav_date);
-
--- 为portfolio表的total_value字段添加注释
-ALTER TABLE portfolios MODIFY COLUMN total_value DECIMAL(18,4) DEFAULT 0 COMMENT '当前总市值（冗余字段，实时计算）';
-
--- 为portfolio表添加净值相关字段
-ALTER TABLE portfolios ADD COLUMN IF NOT EXISTS initial_cost DECIMAL(18,4) DEFAULT 0 COMMENT '初始投入成本';
-ALTER TABLE portfolios ADD COLUMN IF NOT EXISTS last_nav_date DATE COMMENT '最后净值计算日期';