diff --git a/Services/TvSyncService.cs b/Services/TvSyncService.cs
new file mode 100644
index 0000000..4d47aeb
--- /dev/null
+++ b/Services/TvSyncService.cs
@@ -0,0 +1,152 @@
+using System.Text.Json;
+using dbsync.Config;
+using Npgsql;
+using Serilog;
+
+namespace TvSyncApp.Services;
+
+public class TvSyncService
+{
+    private readonly string _connectionString;
+
+    public TvSyncService(string connectionString)
+    {
+        _connectionString = connectionString;
+    }
+
+    // -----------------------------------------
+    // 1. Download Updates
+    // -----------------------------------------
+    public async Task<Dictionary<int, long>> DownloadTvMazeUpdatesAsync(
+        string updatesUrl,
+        string tempDir)
+    {
+        using var http = new HttpClient();
+
+        var json = await http.GetStringAsync(updatesUrl);
+
+        // Deserialize first to validate and normalize
+        var parsed = JsonSerializer.Deserialize<Dictionary<string, long>>(json)
+                     ?? new Dictionary<string, long>();
+
+        // Convert to int-key dictionary (what your app uses)
+        var result = parsed
+            .Where(k => int.TryParse(k.Key, out _))
+            .ToDictionary(k => int.Parse(k.Key), v => v.Value);
+
+        // Pretty-print JSON before saving
+        var options = new JsonSerializerOptions
+        {
+            WriteIndented = true
+        };
+
+        var formattedJson = JsonSerializer.Serialize(result, options);
+
+        var filePath = Path.Combine(tempDir, "tvmaze_updates.json");
+        await File.WriteAllTextAsync(filePath, formattedJson);
+
+        return result;
+    }
+
+
+    // -----------------------------------------
+    // 2. Update DB
+    // -----------------------------------------
+    public void UpdateTvUpdatesTable(Dictionary<int, long> updates)
+    {
+        using var conn = new NpgsqlConnection(_connectionString);
+        conn.Open();
+
+        using var transaction = conn.BeginTransaction();
+
+        using var batch = new NpgsqlBatch(conn, transaction);
+
+        foreach (var kvp in updates)
+        {
+            var cmd = new NpgsqlBatchCommand(@"
+            INSERT INTO updates.tvupdates (seriesid, timestamp)
+            VALUES (@id, @ts)
+            ON CONFLICT (seriesid)
+            DO UPDATE SET timestamp = EXCLUDED.timestamp;");
+
+            cmd.Parameters.AddWithValue("id", kvp.Key);
+            cmd.Parameters.AddWithValue("ts", kvp.Value);
+
+            batch.BatchCommands.Add(cmd);
+        }
+
+        batch.ExecuteNonQuery();
+
+        transaction.Commit();
+
+        Log.Information("Batch updated tvupdates table with {Count} entries.", updates.Count);
+    }
+
+
+    // -----------------------------------------
+    // 3. Determine Files Needed
+    // -----------------------------------------
+    public List<(string Directory, string FileName)> DetermineFilesNeeded(
+        Dictionary<int, long> downloadedUpdates,
+        Dictionary<int, long> previousUpdates,
+        Dictionary<string, string> directories)
+    {
+        var filesNeeded = new List<(string, string)>();
+        var directoryList = directories.Values.ToList();
+
+        foreach (var kvp in downloadedUpdates)
+        {
+            var seriesId = kvp.Key;
+            var newTs = kvp.Value;
+
+            if (previousUpdates.TryGetValue(seriesId, out var oldTs))
+            {
+                if (newTs > oldTs)
+                    foreach (var dir in directoryList)
+                        filesNeeded.Add((dir, $"{seriesId}.json"));
+            }
+            else
+            {
+                foreach (var dir in directoryList)
+                    filesNeeded.Add((dir, $"{seriesId}.json"));
+            }
+        }
+
+        return filesNeeded;
+    }
+
+    // -----------------------------------------
+    // 4. Download Files
+    // -----------------------------------------
+    public async Task DownloadSeriesFilesAsync(
+        List<(string Directory, string FileName)> filesNeeded,
+        Dictionary<string, string> skipIds,
+        Settings settings)
+    {
+        using var http = new HttpClient();
+
+        foreach (var item in filesNeeded)
+        {
+            var seriesId = item.FileName.Replace(".json", "");
+            var url = settings.Json!.SeriesApi!
+                .Replace("<seriesid>", seriesId);
+
+            if (skipIds.ContainsKey(seriesId))
+            {
+                Log.Information("Skipping series {SeriesId}", seriesId);
+                continue;
+            }
+
+            try
+            {
+                var json = await http.GetStringAsync(url);
+                var savePath = Path.Combine(item.Directory, item.FileName);
+                await File.WriteAllTextAsync(savePath, json);
+            }
+            catch (Exception ex)
+            {
+                Log.Error(ex, "Failed downloading {SeriesId}", seriesId);
+            }
+        }
+    }
+}
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