Fixed: Loading old commands from database

Fixes #926

(cherry picked from commit 0f87cb72e559a19bddc6c9d4387ec7d9428291f8)

src/NzbDrone.Core/Datastore/Converters/TimeSpanConverter.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Data;
+using Dapper;
+
+namespace NzbDrone.Core.Datastore.Converters
+{
+    public class DapperTimeSpanConverter : SqlMapper.TypeHandler<TimeSpan>
+    {
+        public override void SetValue(IDbDataParameter parameter, TimeSpan value)
+        {
+            parameter.Value = value.ToString();
+        }
+
+        public override TimeSpan Parse(object value)
+        {
+            return TimeSpan.Parse((string)value);
+        }
+    }
+}

src/NzbDrone.Core/Datastore/TableMapping.cs

@@ -105,6 +105,7 @@ namespace NzbDrone.Core.Datastore
 
             SqlMapper.RemoveTypeMap(typeof(DateTime));
             SqlMapper.AddTypeHandler(new DapperUtcConverter());
+            SqlMapper.AddTypeHandler(new DapperTimeSpanConverter());
             SqlMapper.AddTypeHandler(new EmbeddedDocumentConverter<Dictionary<string, string>>());
             SqlMapper.AddTypeHandler(new CookieConverter());
             SqlMapper.AddTypeHandler(new EmbeddedDocumentConverter<List<int>>());