novelly/src/Novelly.Api/Agent/AgentConversation.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Builders;
using Novelly.Api.Projects;

namespace Novelly.Api.Agent;

public class AgentConversation
{
    public Guid Id { get; init; } = Guid.NewGuid();
    public Guid ProjectId { get; init; }
    public Project? Project { get; init; }

    public string Title { get; init; } = "New conversation";

    public DateTimeOffset CreatedAt { get; init; } = DateTimeOffset.UtcNow;
    public DateTimeOffset UpdatedAt { get; set; } = DateTimeOffset.UtcNow;

    public List<AgentMessage> Messages { get; init; } = [];
}

public class AgentMessage
{
    public Guid Id { get; init; } = Guid.NewGuid();
    public Guid ConversationId { get; init; }
    public AgentConversation? Conversation { get; init; }

    public AgentRole Role { get; init; }

    public int Sequence { get; init; }

    public string Content { get; init; } = string.Empty;

    public string? ToolCallsJson { get; init; }

    public DateTimeOffset CreatedAt { get; init; } = DateTimeOffset.UtcNow;
}

public class AgentConversationEntityTypeConfiguration : IEntityTypeConfiguration<AgentConversation>
{
    public void Configure(EntityTypeBuilder<AgentConversation> entity)
    {
        entity.Property(c => c.Title).IsRequired().HasMaxLength(200);
        entity.HasMany(c => c.Messages).WithOne(m => m.Conversation!)
            .HasForeignKey(m => m.ConversationId).OnDelete(DeleteBehavior.Cascade);
    }
}

public class AgentMessageEntityTypeConfiguration : IEntityTypeConfiguration<AgentMessage>
{
    public void Configure(EntityTypeBuilder<AgentMessage> entity)
    {
        entity.Property(m => m.Role).HasConversion<string>().HasMaxLength(16);
        entity.HasIndex(m => new { m.ConversationId, m.Sequence }).IsUnique();
    }
}