feat(sentiment): add persistent sentiment entities, summaries, SentimentDbService and MQTT RPC refactoring

FinlyticSentiment/Entities/ArticleSentimentEntity.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace FinlyticSentiment.Entities;
+
+/// <summary>
+/// Entity representing a single sentiment evaluation of an asset mentioned in a news article.
+/// </summary>
+[Table("article_sentiments")]
+public class ArticleSentimentEntity
+{
+    [Key]
+    public Guid Id { get; set; } = Guid.NewGuid();
+
+    [Required]
+    public Guid ArticleId { get; set; }
+
+    [Required]
+    [MaxLength(12)]
+    public string Isin { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(256)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(128)]
+    public string? Sector { get; set; }
+
+    [Required]
+    [MaxLength(32)]
+    public string Label { get; set; } = "NEUTRAL";
+
+    public double CompoundScore { get; set; }
+
+    public double Confidence { get; set; }
+
+    [MaxLength(32)]
+    public string? Impact { get; set; }
+
+    public double PositiveProbability { get; set; }
+
+    public double NegativeProbability { get; set; }
+
+    public double NeutralProbability { get; set; }
+
+    [MaxLength(1024)]
+    public string? KeyHighlight { get; set; }
+
+    public DateTime PublishedAtUtc { get; set; }
+
+    public DateTime AnalyzedAtUtc { get; set; } = DateTime.UtcNow;
+}