diff --git a/Marechai.Database/Models/Extent.cs b/Marechai.Database/Models/Extent.cs
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+++ b/Marechai.Database/Models/Extent.cs
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+/******************************************************************************
+// MARECHAI: Master repository of computing history artifacts information
+// ----------------------------------------------------------------------------
+//
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as
+//     published by the Free Software Foundation, either version 3 of the
+//     License, or (at your option) any later version.
+//
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2003-2020 Natalia Portillo
+*******************************************************************************/
+
+namespace Marechai.Database.Models
+{
+    // Not for table
+    public class Extent
+    {
+        public long Start { get; set; }
+        public long End   { get; set; }
+        public bool Error { get; set; }
+    }
+}
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