Integrated news headline functions.

Backend.cs

@@ -15,6 +15,7 @@ builder.Services.AddSingleton<IUserInterestStore, PostgresUserInterestStore>();
 builder.Services.AddSingleton<FinBertScoringService>();
 builder.Services.AddSingleton<INewsSentimentStore, PostgresNewsSentimentStore>();
 builder.Services.AddSingleton<NewsSentimentService>();
+builder.Services.AddHostedService<NewsSentimentRefreshService>();
 
 builder.Services.AddCors(options =>
 {

Controller/NewsSentimentController.cs

@@ -1,3 +1,4 @@
+using Backend.Interface;
 using Backend.ServiceHander;
 using Microsoft.AspNetCore.Mvc;
 
@@ -7,11 +8,20 @@ namespace Backend.Controller
 	[Route("api/news-sentiment")]
 	public sealed class NewsSentimentController : ControllerBase
 	{
+		private static DateTime _lastRefresh = DateTime.MinValue;
+		private static readonly Lock _refreshLock = new();
 		private readonly NewsSentimentService _service;
+		private readonly IUserInterestStore _interests;
+		private readonly INewsSentimentStore _store;
 
-		public NewsSentimentController(NewsSentimentService service)
+		public NewsSentimentController(
+			NewsSentimentService service,
+			IUserInterestStore interests,
+			INewsSentimentStore store)
 		{
 			_service = service;
+			_interests = interests;
+			_store = store;
 		}
 
 		[HttpGet]
@@ -30,6 +40,7 @@ namespace Backend.Controller
 					title = r.Title,
 					score = r.Score,
 					sentimentLabel = r.SentimentLabel,
+					publisher = r.Publisher,
 					url = r.Url
 				}));
 			}
@@ -42,5 +53,91 @@ namespace Backend.Controller
 				return StatusCode(500, new { error = ex.ToString() });
 			}
 		}
+
+		[HttpGet("feed")]
+		public async Task<IActionResult> Feed(
+			[FromQuery] string user,
+			[FromQuery] string? keyword = null,
+			[FromQuery(Name = "request-amount")] int requestAmount = 20,
+			CancellationToken cancellationToken = default)
+		{
+			try
+			{
+				if (string.IsNullOrWhiteSpace(user))
+					return BadRequest("User cannot be empty.");
+
+				if (requestAmount < 1)
+					requestAmount = 1;
+
+				List<string> keywords;
+
+				if (!string.IsNullOrWhiteSpace(keyword))
+				{
+					keywords = [keyword.Trim()];
+				}
+				else
+				{
+					var symbols = await _interests.FetchAllAsync(user, "symbol");
+					var topics = await _interests.FetchAllAsync(user, "topic");
+					keywords = symbols.Concat(topics).Distinct().ToList();
+				}
+
+				if (keywords.Count == 0)
+					return Ok(Array.Empty<object>());
+
+				var results = await _store.GetFeedAsync(keywords, requestAmount, cancellationToken);
+
+				return Ok(results.Select(r => new
+				{
+					title = r.Title,
+					publisher = r.Publisher,
+					score = r.Score,
+					publishedAt = r.PublishedAt.UtcDateTime.ToString("yyyy-MM-ddTHH:mm:ssZ"),
+					url = r.Url
+				}));
+			}
+			catch (ArgumentException ex)
+			{
+				return BadRequest(ex.Message);
+			}
+			catch (Exception ex)
+			{
+				return StatusCode(500, new { error = ex.ToString() });
+			}
+		}
+		[HttpGet("refresh")]
+		public async Task<ActionResult<BoolResponse>> Refresh(
+			[FromQuery] string user,
+			CancellationToken cancellationToken = default)
+		{
+			try
+			{
+				if (string.IsNullOrWhiteSpace(user))
+					return BadRequest("User cannot be empty.");
+
+				// 5 second refresh cooldown - abuse protection 	
+				lock (_refreshLock)
+				{
+					if ((DateTime.UtcNow - _lastRefresh).TotalSeconds < 5)
+						return Ok(new BoolResponse { Success = false });
+					_lastRefresh = DateTime.UtcNow;
+				}
+
+				var symbols = await _interests.FetchAllAsync(user, "symbol");
+				var topics = await _interests.FetchAllAsync(user, "topic");
+				var keywords = symbols.Concat(topics).Distinct().ToList();
+
+				foreach (var keyword in keywords)
+				{
+					await _service.AnalyzeAsync(keyword, cancellationToken);
+				}
+
+				return Ok(new BoolResponse { Success = true });
+			}
+			catch (Exception)
+			{
+				return Ok(new BoolResponse { Success = false });
+			}
+		}
 	}
 }

Controller/UserInterestController.cs

@@ -35,13 +35,15 @@ namespace Backend.Controllers
 			}
 		}
 
-		[HttpPost("add")]
+		[HttpGet("add")]
 		public async Task<ActionResult<BoolResponse>> Add(
-			[FromBody] UserInterestModifyRequest request)
+			[FromQuery] string user,
+			[FromQuery] string type,
+			[FromQuery] string value)
 		{
 			try
 			{
-				bool success = await _store.AddAsync(request.User, request.Type, request.Value);
+				bool success = await _store.AddAsync(user, type, value);
 				return Ok(new BoolResponse { Success = success });
 			}
 			catch (ArgumentException ex)
@@ -50,13 +52,15 @@ namespace Backend.Controllers
 			}
 		}
 
-		[HttpDelete("remove")]
+		[HttpGet("remove")]
 		public async Task<ActionResult<BoolResponse>> Remove(
-			[FromBody] UserInterestModifyRequest request)
+			[FromQuery] string user,
+			[FromQuery] string type,
+			[FromQuery] string value)
 		{
 			try
 			{
-				bool success = await _store.RemoveAsync(request.User, request.Type, request.Value);
+				bool success = await _store.RemoveAsync(user, type, value);
 				return Ok(new BoolResponse { Success = success });
 			}
 			catch (ArgumentException ex)

DatabaseHandler/HistoricalRequestParser.cs

@@ -94,11 +94,14 @@ Console.WriteLine(raw);
 			// Intraday fraction: (6.5h × 5 days) / (24h × 7 days) ≈ 0.194
 			// Daily/weekly fraction (weekdays only): 5 / 7 ≈ 0.714
 			// Monthly bars already map 1:1 to calendar months, no adjustment needed.
+			// NYSE has ~252 trading days per year (weekdays minus ~10 holidays).
+			// Using 252/365 instead of 5/7 avoids overestimating for 3+ month windows
+			// where accumulated holidays cause the cache check to fail.
 			double marketFraction = barSize switch
 			{
 				HistoricalBarSize.OneMonth => 1.0,
-				HistoricalBarSize.OneDay or HistoricalBarSize.FiveDays => 5.0 / 7.0,
+				HistoricalBarSize.OneDay or HistoricalBarSize.FiveDays => 252.0 / 365.0,
-				_ => (6.5 * 5.0) / (24.0 * 7.0)
+				_ => (6.5 * 252.0) / (24.0 * 365.0)
 			};
 
 			return Math.Max(1, (int)Math.Floor(duration.TotalSeconds * marketFraction / secondsPerBar));

DatabaseHandler/NewsSentimentRecord.cs

@@ -9,6 +9,7 @@ namespace Backend.DatabaseHandler
 		public double Score { get; init; }
 		public string SentimentLabel { get; init; } = string.Empty;
 		public string TitleHash { get; init; } = string.Empty;
+		public string Publisher { get; init; } = string.Empty;
 		public string Url { get; init; } = string.Empty;
 	}
 }

DatabaseHandler/PostgresNewsSentimentStore.cs

@@ -24,7 +24,7 @@ namespace Backend.DatabaseHandler
 
 			const string sql = """
 				SELECT source, keyword, published_at, title, score,
-                       sentiment_label, title_hash, url
+						sentiment_label, title_hash, publisher, url
 				FROM news_sentiment_cache
 				WHERE keyword = @keyword
 				ORDER BY published_at DESC;
@@ -45,7 +45,55 @@ namespace Backend.DatabaseHandler
 					Score = reader.GetDouble(4),
 					SentimentLabel = reader.GetString(5),
 					TitleHash = reader.GetString(6).TrimEnd(),
-					Url = reader.GetString(7)
+					Publisher = reader.GetString(7),
+					Url = reader.GetString(8)
+				});
+			}
+
+			return results;
+		}
+
+		public async Task<List<NewsSentimentRecord>> GetFeedAsync(
+			IEnumerable<string> keywords,
+			int limit,
+			CancellationToken cancellationToken = default)
+		{
+			var keywordList = keywords.ToList();
+			if (keywordList.Count == 0)
+				return [];
+
+			var results = new List<NewsSentimentRecord>();
+
+			await using var conn = new NpgsqlConnection(_connectionString);
+			await conn.OpenAsync(cancellationToken);
+
+			const string sql = """
+				SELECT source, keyword, published_at, title, score,
+						sentiment_label, title_hash, publisher, url
+				FROM news_sentiment_cache
+				WHERE keyword = ANY(@keywords)
+				ORDER BY published_at DESC
+				LIMIT @limit;
+				""";
+
+			await using var cmd = new NpgsqlCommand(sql, conn);
+			cmd.Parameters.AddWithValue("keywords", keywordList.ToArray());
+			cmd.Parameters.AddWithValue("limit", limit);
+
+			await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+			while (await reader.ReadAsync(cancellationToken))
+			{
+				results.Add(new NewsSentimentRecord
+				{
+					Source = reader.GetString(0),
+					Keyword = reader.GetString(1),
+					PublishedAt = reader.GetFieldValue<DateTimeOffset>(2),
+					Title = reader.GetString(3),
+					Score = reader.GetDouble(4),
+					SentimentLabel = reader.GetString(5),
+					TitleHash = reader.GetString(6).TrimEnd(),
+					Publisher = reader.GetString(7),
+					Url = reader.GetString(8)
 				});
 			}
 
@@ -68,10 +116,10 @@ namespace Backend.DatabaseHandler
 			const string sql = """
 				INSERT INTO news_sentiment_cache
 				(source, keyword, published_at, title, score,
-                 sentiment_label, title_hash, url)
+				 sentiment_label, title_hash, publisher, url)
 				VALUES
 				(@source, @keyword, @published_at, @title, @score,
-                 @sentiment_label, @title_hash, @url)
+				 @sentiment_label, @title_hash, @publisher, @url)
 				ON CONFLICT (title_hash) DO NOTHING;
 				""";
 
@@ -85,6 +133,7 @@ namespace Backend.DatabaseHandler
 				cmd.Parameters.AddWithValue("score", record.Score);
 				cmd.Parameters.AddWithValue("sentiment_label", record.SentimentLabel);
 				cmd.Parameters.AddWithValue("title_hash", record.TitleHash);
+				cmd.Parameters.AddWithValue("publisher", record.Publisher);
 				cmd.Parameters.AddWithValue("url", record.Url);
 
 				await cmd.ExecuteNonQueryAsync(cancellationToken);

DatabaseHandler/PostgresUserInterestStore.cs

@@ -49,6 +49,29 @@ public sealed class PostgresUserInterestStore : IUserInterestStore
 		return results;
 	}
 
+	public async Task<List<string>> FetchAllDistinctValuesAsync(CancellationToken cancellationToken = default)
+	{
+		const string sql = """
+			SELECT symbol AS value FROM user_interest_symbols
+			UNION
+			SELECT topic AS value FROM user_interest_topics;
+			""";
+
+		var results = new List<string>();
+
+		await using var conn = new NpgsqlConnection(_connectionString);
+		await conn.OpenAsync(cancellationToken);
+
+		await using var cmd = new NpgsqlCommand(sql, conn);
+		await using var reader = await cmd.ExecuteReaderAsync(cancellationToken);
+		while (await reader.ReadAsync(cancellationToken))
+		{
+			results.Add(reader.GetString(0));
+		}
+
+		return results;
+	}
+
 	public async Task<bool> AddAsync(string user, string type, string value)
 	{
 		ValidateUser(user);

Interface/INewsSentimentStore.cs

@@ -8,6 +8,11 @@ namespace Backend.Interface
 			string keyword,
 			CancellationToken cancellationToken = default);
 
+		Task<List<NewsSentimentRecord>> GetFeedAsync(
+			IEnumerable<string> keywords,
+			int limit,
+			CancellationToken cancellationToken = default);
+
 		Task InsertAsync(
 			IEnumerable<NewsSentimentRecord> records,
 			CancellationToken cancellationToken = default);

Interface/IUserInterestCache.cs

@@ -3,6 +3,7 @@ namespace Backend.Interface
 	public interface IUserInterestStore
 	{
 		Task<List<string>> FetchAllAsync(string user, string type);
+		Task<List<string>> FetchAllDistinctValuesAsync(CancellationToken cancellationToken = default);
 		Task<bool> AddAsync(string user, string type, string value);
 		Task<bool> RemoveAsync(string user, string type, string value);
 	}

ServiceHandler/NewsSentimentRefreshService.cs

@@ -0,0 +1,78 @@
+using Backend.Interface;
+
+namespace Backend.ServiceHander
+{
+	public sealed class NewsSentimentRefreshService : BackgroundService
+	{
+		private static readonly TimeSpan PollInterval = TimeSpan.FromMinutes(15);
+		private static readonly TimeZoneInfo Pacific = TimeZoneInfo.FindSystemTimeZoneById("America/Los_Angeles");
+
+		private readonly IServiceProvider _services;
+		private readonly ILogger<NewsSentimentRefreshService> _logger;
+
+		public NewsSentimentRefreshService(
+			IServiceProvider services,
+			ILogger<NewsSentimentRefreshService> logger)
+		{
+			_services = services;
+			_logger = logger;
+		}
+
+		protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+		{
+			while (!stoppingToken.IsCancellationRequested)
+			{
+				if (IsWithinActiveWindow())
+				{
+					await RefreshAsync(stoppingToken);
+				}
+				else
+				{
+					_logger.LogDebug("Outside active window (weekdays 07:00-20:00 PST), skipping refresh.");
+				}
+
+				await Task.Delay(PollInterval, stoppingToken);
+			}
+		}
+
+		private static bool IsWithinActiveWindow()
+		{
+			var pacificNow = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, Pacific);
+
+			if (pacificNow.DayOfWeek is DayOfWeek.Saturday or DayOfWeek.Sunday)
+				return false;
+
+			var hour = pacificNow.Hour;
+			return hour >= 7 && hour < 20;
+		}
+
+		private async Task RefreshAsync(CancellationToken cancellationToken)
+		{
+			try
+			{
+				var interests = _services.GetRequiredService<IUserInterestStore>();
+				var sentiment = _services.GetRequiredService<NewsSentimentService>();
+
+				var keywords = await interests.FetchAllDistinctValuesAsync(cancellationToken);
+
+				_logger.LogInformation("Refreshing news for {Count} keywords.", keywords.Count);
+
+				foreach (var keyword in keywords)
+				{
+					try
+					{
+						await sentiment.AnalyzeAsync(keyword, cancellationToken);
+					}
+					catch (Exception ex)
+					{
+						_logger.LogWarning(ex, "Failed to refresh news for keyword '{Keyword}'.", keyword);
+					}
+				}
+			}
+			catch (Exception ex)
+			{
+				_logger.LogError(ex, "News sentiment refresh cycle failed.");
+			}
+		}
+	}
+}

ServiceHandler/NewsSentimentService.cs

@@ -40,17 +40,19 @@ namespace Backend.ServiceHander
 				if (existingHashes.Contains(titleHash))
 					continue;
 
-				var (score, label) = _scorer.Score(title);
+				var (headline, publisher) = ParsePublisher(title);
+				var (score, label) = _scorer.Score(headline);
 
 				newRecords.Add(new NewsSentimentRecord
 				{
 					Source = "google_rss",
 					Keyword = keyword,
 					PublishedAt = publishedAt,
-					Title = title,
+					Title = headline,
 					Score = score,
 					SentimentLabel = label,
 					TitleHash = titleHash,
+					Publisher = publisher,
 					Url = url
 				});
 			}
@@ -92,6 +94,14 @@ namespace Backend.ServiceHander
 			return items;
 		}
 
+		private static (string Headline, string Publisher) ParsePublisher(string title)
+		{
+			int idx = title.LastIndexOf(" - ");
+			if (idx < 0)
+				return (title, "Unknown");
+			return (title[..idx].Trim(), title[(idx + 3)..].Trim());
+		}
+
 		private static string ComputeHash(string text)
 		{
 			byte[] bytes = SHA256.HashData(Encoding.UTF8.GetBytes(text));