moved log to object db.

NzbDrone.Core/Instrumentation/LogRepository.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Linq;
+using NzbDrone.Core.Datastore;
+
+namespace NzbDrone.Core.Instrumentation
+{
+    public interface ILogRepository : IBasicRepository<Log>
+    {
+        void Trim();
+    }
+
+    public class LogRepository : BasicRepository<Log>, ILogRepository
+    {
+        public LogRepository(IObjectDatabase objectDatabase)
+            : base(objectDatabase)
+        {
+        }
+
+        public void Trim()
+        {
+            var oldIds = Queryable.Where(c => c.Time < DateTime.Now.AddDays(-30).Date).Select(c => c.OID);
+            DeleteMany(oldIds);
+        }
+    }
+}