using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace FinlyticTechnicals.Entities;

/// <summary>
/// Persisted backing store for <c>TechnicalUniverseManager</c>'s continuously-scanned asset universe (one row
/// per monitored ISIN). Deliberately NOT meant to survive a service restart - <c>Program.cs</c> clears this
/// table on every startup, since the universe is fully rebuilt within minutes from
/// <c>RefreshFavoritesAsync</c>/<c>RefreshDiscoveryAsync</c> and fresh sentiment-spike events, and a stale row
/// that never got TTL-swept because the process was down is worse than starting from an empty universe.
/// </summary>
[Table("fta_monitored_universe_assets")]
public class FtaMonitoredUniverseAssetEntity
{
    [Key]
    [MaxLength(20)]
    public string Isin { get; set; } = string.Empty;

    [MaxLength(30)]
    public string? Symbol { get; set; }

    /// <summary>String form of <c>FinlyticCore.Dtos.TechnicalAnalysis.UniverseSource</c>.</summary>
    [Required]
    [MaxLength(20)]
    public string Source { get; set; } = string.Empty;

    /// <summary>Lower value = higher scan priority (SentimentSpike=1, UserFavorite=2, Discovery=3).</summary>
    public int Priority { get; set; }

    [Required]
    public DateTime AddedAtUtc { get; set; } = DateTime.UtcNow;

    /// <summary><see langword="null"/> for favorites/discovery entries, which never expire by TTL.</summary>
    public DateTime? ExpiresAtUtc { get; set; }
}