diff --git a/AsbCloudDb/EFExtentions.cs b/AsbCloudDb/EFExtentions.cs
index 3cbf3509..a00f2899 100644
--- a/AsbCloudDb/EFExtentions.cs
+++ b/AsbCloudDb/EFExtentions.cs
@@ -69,6 +69,14 @@ namespace AsbCloudDb
             return database.ExecuteSqlRawAsync(query, token);
         }
 
+        public static Task<int> ExecInsertOrIgnoreAsync<T>(this Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade database, DbSet<T> dbSet, IEnumerable<T> items, CancellationToken token)
+            where T : class
+        {
+            var factory = GetQueryStringFactory(dbSet);
+            var query = factory.MakeInsertOrIgnoreSql(items);
+            return database.ExecuteSqlRawAsync(query, token);
+        }
+
         public static Task<int> ExecInsertAsync<T>(this Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade database, DbSet<T> dbSet, IEnumerable<T> items, CancellationToken token)
             where T : class
         {
@@ -162,6 +170,14 @@ namespace AsbCloudDb
             conflictBody = $" ON CONFLICT {pk} DO UPDATE SET {excludedUpdateSet};";
         }
 
+        public string MakeInsertOrIgnoreSql(IEnumerable<T> items)
+        {
+            var builder = new StringBuilder(insertHeader, 7);
+            BuildRows(builder, items);
+            builder.Append(" ON CONFLICT DO NOTHING;");
+            return builder.ToString();
+        }
+
         public string MakeInsertOrUpdateSql(IEnumerable<T> items)
         {
             var builder = new StringBuilder(insertHeader, 7);
diff --git a/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs b/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
index 0c750c6b..cc53d92e 100644
--- a/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
+++ b/AsbCloudInfrastructure/Repository/WitsRecordRepository.cs
@@ -12,9 +12,10 @@ using System.Threading.Tasks;
 namespace AsbCloudInfrastructure.Repository
 {
     public class WitsRecordRepository<TDto, TEntity> : IWitsRecordRepository<TDto>
-        where TEntity : class, ITelemetryData
+        where TEntity : AsbCloudDb.Model.WITS.RecordBase, ITelemetryData
         where TDto : AsbCloudApp.Data.ITelemetryData
     {
+        private static Random random = new Random((int)(DateTime.Now.Ticks % 0xFFFFFFFF));
         private readonly DbSet<TEntity> dbset;
         private readonly IAsbCloudDbContext db;
         private readonly ITelemetryService telemetryService;
@@ -78,31 +79,62 @@ namespace AsbCloudInfrastructure.Repository
 
             var dateMin = entities.Min(e => e.DateTime);
             var dateMax = entities.Max(e => e.DateTime);
-            var existingEntities = await dbset
+            var existingEntities = await db.Set<AsbCloudDb.Model.WITS.RecordBase>()
                 .Where(e => e.IdTelemetry == idTelemetry)
                 .Where(e => e.DateTime >= dateMin && e.DateTime <= dateMax)
-                .Select(e => new { e.DateTime, e.IdTelemetry})
+                .Select(e => e.DateTime)
+                .OrderBy(d => d)
                 .ToArrayAsync(token);
-
+            
             foreach (var entity in entities)
             {
-                if (existingEntities.Any(e=>e.IdTelemetry == entity.IdTelemetry && e.DateTime == entity.DateTime))                
-                    dbset.Update(entity);                
-                else
+                if (!existingEntities.Any(e => e.DateTime == entity.DateTime))
+                {
                     dbset.Add(entity);
+                }
+                else
+                {
+                    var dt = entity.DateTime;
+                    entity.DateTime = new DateTimeOffset(
+                        dt.Year,
+                        dt.Month,
+                        dt.Day,
+                        dt.Hour,
+                        dt.Minute,
+                        dt.Second,
+                        (dt.Millisecond + random.Next(1, 283)) % 1000,
+                        dt.Offset);
+                    dbset.Add(entity);
+                }                    
             }
             
             await db.SaveChangesAsync(token);
         }
 
+        private static short GetRecId(TDto dto)
+        {
+            var recid = dto switch
+            {
+                AsbCloudApp.Data.WITS.Record1Dto _ => 1,
+                AsbCloudApp.Data.WITS.Record7Dto _ => 7,
+                AsbCloudApp.Data.WITS.Record8Dto _ => 8,
+                AsbCloudApp.Data.WITS.Record50Dto _ => 50,
+                AsbCloudApp.Data.WITS.Record60Dto _ => 60,
+                AsbCloudApp.Data.WITS.Record61Dto _ => 61,
+                _ => 0,
+            };
+            return (short)recid;
+        }
+
         private static TEntity Convert(TDto dto, int idTelemetry, double timezoneHours)
         {
             if (dto is null)
                 return null;
 
             var entity = dto.Adapt<TEntity>();
-            entity.IdTelemetry = idTelemetry;
-            entity.DateTime = dto.DateTime.ToUtcDateTimeOffset(timezoneHours);
+            entity.Recid = GetRecId(dto);
+            entity.IdTelemetry = idTelemetry;            
+            entity.DateTime = dto.DateTime.ToUtcDateTimeOffset(timezoneHours);            
             return entity;
         }