feat(simulation): add quant simulation microservice with virtual backtest broker and replay engine

FinlyticSimulation/Database/Entities/SimulationStrategyParameterEntity.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticSimulation.Database.Entities;
+
+/// <summary>
+/// A saved, named-by-(Isin, StrategyKey) set of tunable indicator parameter overrides (see
+/// <c>TechnicalContext.ParameterOverrides</c>), so a parameter set found useful via repeated backtest
+/// experimentation can be reused without retyping it every time. Purely a backtesting-side convenience - never
+/// read by live scanning (<c>FinlyticTechnicals.Services.TechnicalScoringEngine</c> never queries this table).
+/// </summary>
+[Table("simulation_strategy_parameters")]
+public class SimulationStrategyParameterEntity
+{
+    [Required]
+    [MaxLength(20)]
+    public string Isin { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(50)]
+    public string StrategyKey { get; set; } = string.Empty;
+
+    /// <summary>Keyed by <c>"{StrategyKey}.{ParameterName}"</c>, matching <c>TechnicalContext.ParameterOverrides</c> 1:1.</summary>
+    public Dictionary<string, decimal> Parameters { get; set; } = new();
+
+    public DateTime UpdatedAtUtc { get; set; } = DateTime.UtcNow;
+}