Add housekeeping task to unmonitor multiple monitored editions

src/NzbDrone.Core/Housekeeping/Housekeepers/FixMultipleMonitoredEditions.cs

@@ -0,0 +1,30 @@
+using Dapper;
+using NzbDrone.Core.Datastore;
+
+namespace NzbDrone.Core.Housekeeping.Housekeepers
+{
+    public class FixMultipleMonitoredEditions : IHousekeepingTask
+    {
+        private readonly IMainDatabase _database;
+
+        public FixMultipleMonitoredEditions(IMainDatabase database)
+        {
+            _database = database;
+        }
+
+        public void Clean()
+        {
+            using var mapper = _database.OpenConnection();
+
+            mapper.Execute(@"UPDATE ""Editions""
+                            SET ""Monitored"" = 0
+                            WHERE ""Id"" IN (
+                                SELECT MIN(""Id"")
+                                FROM ""Editions""
+                                WHERE ""Monitored"" = 1
+                                GROUP BY ""BookId""
+                                HAVING COUNT(""BookId"") > 1
+                            )");
+        }
+    }
+}