Updated code to save results from query reading updates table to file while saving file from previous 5 runs.

TvSyncApp.cs

@@ -1,9 +1,10 @@
-using System;
-using System.IO;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Npgsql;
+using Npgsql;
 using Serilog;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+using System.Threading.Tasks;
 
 namespace TvSyncApp
 {
@@ -43,7 +44,12 @@ namespace TvSyncApp
 
             // --- Fetch series IDs from PostgreSQL ---
             string connectionString = $"Host={settings.DbSettings.Hostname};Port={settings.DbSettings.PgsqlPort};Username={settings.DbSettings.PgsqlUsername};Password={settings.DbSettings.PgsqlPassword};Database={settings.DbSettings.DbName}";
-            List<int> seriesIds = GetSeriesIdsFromDb(connectionString);
+            List<SeriesUpdate> seriesUpdates = GetSeriesIdsFromDb(connectionString);
+
+            List<string> seriesIds = seriesUpdates
+            .Select(x => x.SeriesId.ToString())
+            .ToList();
+
 
             Log.Information("Fetched {Count} series IDs from tvupdates table.", seriesIds.Count);
 
@@ -62,35 +68,84 @@ namespace TvSyncApp
 
             return 0;
         }
-
-        private static List<int> GetSeriesIdsFromDb(string connectionString)
+        private static List<SeriesUpdate> GetSeriesIdsFromDb(string connectionString)
         {
-            var seriesIds = new List<int>();
+            var results = new List<SeriesUpdate>();
 
             try
             {
                 using var conn = new NpgsqlConnection(connectionString);
                 conn.Open();
 
-                string query = "SELECT seriesid FROM updates.tvupdates ORDER BY seriesid";
+                const string query = @"
+            SELECT seriesid, timestamp 
+            FROM updates.tvupdates 
+            ORDER BY seriesid";
 
                 using var cmd = new NpgsqlCommand(query, conn);
                 using var reader = cmd.ExecuteReader();
 
                 while (reader.Read())
                 {
-                    if (!reader.IsDBNull(0))
-                        seriesIds.Add(reader.GetInt32(0));
+                    if (!reader.IsDBNull(0) && !reader.IsDBNull(1))
+                    {
+                        results.Add(new SeriesUpdate
+                        {
+                            SeriesId = reader.GetInt32(0),
+                            Timestamp = long.Parse(reader.GetString(1))
+                        });
+                    }
                 }
+
+                SaveSeriesUpdatesToFile(results);
             }
             catch (Exception ex)
             {
-                Log.Error(ex, "Failed to fetch series IDs from PostgreSQL.");
+                Log.Error(ex, "Failed to fetch series updates or manage JSON output.");
             }
 
-            return seriesIds;
+            return results;
         }
 
+        private static void SaveSeriesUpdatesToFile(List<SeriesUpdate> data)
+        {
+            string configDir = Path.Combine(AppContext.BaseDirectory, "config");
+            Directory.CreateDirectory(configDir);
+
+            string fileName = "previous_tvmaze_updates.json";
+            string filePath = Path.Combine(configDir, fileName);
+
+            if (File.Exists(filePath))
+            {
+                string timestamp = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
+                string archiveName = $"previous_tvmaze_updates_{timestamp}.json";
+                string archivePath = Path.Combine(configDir, archiveName);
+
+                File.Move(filePath, archivePath);
+            }
+
+            var options = new JsonSerializerOptions
+            {
+                WriteIndented = true
+            };
+
+            string json = JsonSerializer.Serialize(data, options);
+            File.WriteAllText(filePath, json);
+
+            var archives = Directory.GetFiles(configDir, "previous_tvmaze_updates_*.json")
+                .Select(f => new FileInfo(f))
+                .OrderByDescending(f => f.CreationTimeUtc)
+                .ToList();
+
+            foreach (var oldFile in archives.Skip(5))
+            {
+                oldFile.Delete();
+            }
+
+            Log.Information("Saved {Count} series updates to {FilePath}", data.Count, filePath);
+        }
+
+
         private static void CreateDirectories(string rootDir)
         {
             Directory.CreateDirectory(Path.Combine(rootDir, "log"));
@@ -102,4 +157,11 @@ namespace TvSyncApp
             Directory.CreateDirectory(Path.Combine(rootDir, "cache", "crew"));
         }
     }
+
+    public class SeriesUpdate
+    {
+        public int SeriesId { get; set; }
+        public long Timestamp { get; set; }
+    }
+
 }