feat(News): refactor news service and add sentiment tracking

FinlyticNews/Entities/NewsArticleEntity.cs

@@ -0,0 +1,69 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Represents a news article record stored in the database, tracking its lifecycle status and classification details.
+/// </summary>
+public class NewsArticleEntity
+{
+    /// <summary>
+    /// Gets or sets the unique primary key identifier.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// Gets or sets the title of the article.
+    /// </summary>
+    [Required]
+    public string Title { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the author of the article.
+    /// </summary>
+    public string? Author { get; set; }
+
+    /// <summary>
+    /// Gets or sets a brief summary of the article content.
+    /// </summary>
+    public string? Summary { get; set; }
+
+    /// <summary>
+    /// Gets or sets the raw extracted text content.
+    /// </summary>
+    [Required]
+    public string ContentRaw { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the language of the article.
+    /// </summary>
+    public string? Language { get; set; }
+
+    /// <summary>
+    /// Gets or sets the unique source URL of the article. Used for duplicate checking (idempotency).
+    /// </summary>
+    [Required]
+    public string SourceUrl { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the local timestamp when the scraper processed this article.
+    /// </summary>
+    public DateTime ScrapedAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the original publication date of the article.
+    /// </summary>
+    public DateTime PublishedAt { get; set; }
+
+    /// <summary>
+    /// Gets or sets the processing lifecycle state (e.g., "Pending", "Processing", "Completed", "Analyzed", "Failed").
+    /// </summary>
+    [Required]
+    public string Status { get; set; } = "Pending";
+
+    /// <summary>
+    /// Gets or sets the list of financial assets matched and associated with this news article.
+    /// </summary>
+    public List<MatchedAssetEntity> MatchedAssets { get; set; } = [];
+}