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src/DRS9.Dashboard.Infrastructure/Data/DashboardDbContext.cs

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+using DRS9.Dashboard.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace DRS9.Dashboard.Infrastructure.Data;
+
+public class DashboardDbContext : DbContext
+{
+    public DashboardDbContext(DbContextOptions<DashboardDbContext> options) : base(options)
+    {
+    }
+
+    public DbSet<Device> Devices { get; set; }
+    public DbSet<DeviceGroup> DeviceGroups { get; set; }
+    public DbSet<Application> Applications { get; set; }
+    public DbSet<DeviceAssignment> DeviceAssignments { get; set; }
+    public DbSet<User> Users { get; set; }
+    public DbSet<AuditLog> AuditLogs { get; set; }
+    public DbSet<Playlist> Playlists { get; set; }
+    public DbSet<PlaylistItem> PlaylistItems { get; set; }
+    public DbSet<AppVersion> AppVersions { get; set; }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        // DeviceGroup 配置
+        modelBuilder.Entity<DeviceGroup>(entity =>
+        {
+            entity.HasIndex(e => e.Name).IsUnique();
+        });
+
+        // Device 配置
+        modelBuilder.Entity<Device>(entity =>
+        {
+            entity.HasIndex(e => e.DeviceCode).IsUnique();
+            entity.HasOne(e => e.DeviceGroup)
+                .WithMany(g => g.Devices)
+                .HasForeignKey(e => e.DeviceGroupId)
+                .OnDelete(DeleteBehavior.SetNull);
+        });
+
+        // Application 配置
+        modelBuilder.Entity<Application>(entity =>
+        {
+            entity.HasIndex(e => e.Name);
+        });
+
+        // DeviceAssignment 配置（多对多关系的中间表）
+        modelBuilder.Entity<DeviceAssignment>(entity =>
+        {
+            entity.HasOne(e => e.Device)
+                .WithMany(d => d.Assignments)
+                .HasForeignKey(e => e.DeviceId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            entity.HasOne(e => e.Application)
+                .WithMany(a => a.Assignments)
+                .HasForeignKey(e => e.ApplicationId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            // 确保同一设备的同一应用只有一个分配
+            entity.HasIndex(e => new { e.DeviceId, e.ApplicationId }).IsUnique();
+        });
+
+        // User 配置
+        modelBuilder.Entity<User>(entity =>
+        {
+            entity.HasIndex(e => e.Username).IsUnique();
+            entity.HasIndex(e => e.Email).IsUnique();
+        });
+
+        // Playlist 配置
+        modelBuilder.Entity<Playlist>(entity =>
+        {
+            entity.HasIndex(e => e.Name);
+            entity.HasOne(e => e.DeviceGroup)
+                .WithMany()
+                .HasForeignKey(e => e.DeviceGroupId)
+                .OnDelete(DeleteBehavior.SetNull);
+        });
+
+        // PlaylistItem 配置
+        modelBuilder.Entity<PlaylistItem>(entity =>
+        {
+            entity.HasOne(e => e.Playlist)
+                .WithMany(p => p.Items)
+                .HasForeignKey(e => e.PlaylistId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            entity.HasOne(e => e.Application)
+                .WithMany()
+                .HasForeignKey(e => e.ApplicationId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            // 同一播放列表中的项目按 Order 排序
+            entity.HasIndex(e => new { e.PlaylistId, e.Order });
+        });
+
+        // AppVersion 配置
+        modelBuilder.Entity<AppVersion>(entity =>
+        {
+            entity.HasIndex(e => new { e.Platform, e.Version });
+        });
+    }
+}

src/DRS9.Dashboard.Infrastructure/Data/DataSeeder.cs

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+using DRS9.Dashboard.Domain.Entities;
+
+namespace DRS9.Dashboard.Infrastructure.Data;
+
+public static class DataSeeder
+{
+    public static async Task SeedAsync(DashboardDbContext context)
+    {
+        // 确保数据库已创建
+        await context.Database.EnsureCreatedAsync();
+
+        // 添加测试设备码
+        if (!context.Devices.Any())
+        {
+            var devices = new List<Device>
+            {
+                new() { DeviceCode = "TEST-001-DEV", DeviceName = "测试设备1", IsEnabled = true },
+                new() { DeviceCode = "TEST-002-DEV", DeviceName = "测试设备2", IsEnabled = true },
+                new() { DeviceCode = "TEST-003-DEV", DeviceName = "测试设备3", IsEnabled = true },
+                new() { DeviceCode = "SCHOOL-001-DS", DeviceName = "学校显示屏1", IsEnabled = true },
+                new() { DeviceCode = "MALL-001-DS", DeviceName = "商场广告屏1", IsEnabled = true }
+            };
+
+            await context.Devices.AddRangeAsync(devices);
+            await context.SaveChangesAsync();
+            Console.WriteLine("已添加 5 个测试设备码");
+        }
+
+        // 添加测试应用
+        if (!context.Applications.Any())
+        {
+            var apps = new List<Application>
+            {
+                new() { Name = "欢迎页面", Type = "Dashboard", ContentUrl = "/dashboard/welcome", IsEnabled = true, Priority = 1 },
+                new() { Name = "新闻轮转", Type = "WebRotator", ContentUrl = "/rotator/news", IsEnabled = true, Priority = 2 },
+                new() { Name = "图片轮播", Type = "ImageRotator", ContentUrl = "/gallery/promo", IsEnabled = true, Priority = 3 }
+            };
+
+            await context.Applications.AddRangeAsync(apps);
+            await context.SaveChangesAsync();
+            Console.WriteLine("已添加 3 个测试应用");
+        }
+    }
+}