feat(technicals): add technical analysis microservice with indicator engines, pattern detectors, and strategies

FinlyticTechnicals/Entities/FtaMonitoredUniverseAssetEntity.cs

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+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; }
+}