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

FinlyticNews/Entities/NewsSettingsEntity.cs

@@ -0,0 +1,47 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace FinlyticNews.Entities;
+
+/// <summary>
+/// Entity representing global runtime settings for the FinlyticNews microservice.
+/// Persisted in PostgreSQL and updated dynamically via Admin Panel MQTT events.
+/// </summary>
+public class NewsSettingsEntity
+{
+    /// <summary>
+    /// Gets or sets the primary key for the settings row.
+    /// </summary>
+    [Key]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// Frequency in minutes for polling RSS feed sources.
+    /// </summary>
+    public int PollingFrequencyMinutes { get; set; } = 15;
+
+    /// <summary>
+    /// Article retention period in days before archival or cleanup.
+    /// </summary>
+    public int ArticleRetentionDays { get; set; } = 90;
+
+    /// <summary>
+    /// Default page size for historical news API pagination queries.
+    /// </summary>
+    public int DefaultPageSize { get; set; } = 20;
+
+    /// <summary>
+    /// Background scraper interval in minutes.
+    /// </summary>
+    public int ScrapingIntervalMinutes { get; set; } = 15;
+
+    /// <summary>
+    /// Webhook URL for n8n AI article analysis.
+    /// </summary>
+    public string N8nWebhookUrl { get; set; } = "http://localhost:5678/webhook/finlytic-news";
+
+    /// <summary>
+    /// Timestamp of last modification.
+    /// </summary>
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}