diff --git a/Persistence.API/Controllers/TimeSeriesController.cs b/Persistence.API/Controllers/TimeSeriesController.cs
index e094cc4..154b96f 100644
--- a/Persistence.API/Controllers/TimeSeriesController.cs
+++ b/Persistence.API/Controllers/TimeSeriesController.cs
@@ -21,13 +21,16 @@ public class TimeSeriesController<TDto> : ControllerBase, ITimeSeriesDataApi<TDt
     {
         var result = await this.timeSeriesDataRepository.GetAsync(dateBegin, dateEnd, token);
         return Ok(result);
+
     }
 
     [HttpGet("datesRange")]
     public async Task<IActionResult> GetDatesRangeAsync(CancellationToken token)
     {
-        var result = await this.timeSeriesDataRepository.GetDatesRangeAsync(token);
-        return Ok(result);
+        //var result = await this.timeSeriesDataCashedRepository.GetDatesRangeAsync(token);
+        //return Ok(result);
+
+        return null;
     }
 
     [HttpPost]
diff --git a/Persistence.Repository/CyclicArray.cs b/Persistence.Repository/CyclicArray.cs
new file mode 100644
index 0000000..fa6d074
--- /dev/null
+++ b/Persistence.Repository/CyclicArray.cs
@@ -0,0 +1,199 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Persistence.Repository;
+/// <summary>
+/// Цикличный массив
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public class CyclicArray<T> : IEnumerable<T>
+{
+    readonly T[] array;
+    int used, current = -1;
+
+    /// <summary>
+    /// constructor
+    /// </summary>
+    /// <param name="capacity"></param>
+    public CyclicArray(int capacity)
+    {
+        array = new T[capacity];
+    }
+
+    /// <summary>
+    /// Количество элементов в массиве
+    /// </summary>
+    public int Count => used;
+
+    /// <summary>
+    /// Добавить новый элемент<br/>
+    /// Если capacity достигнуто, то вытеснит самый первый элемент
+    /// </summary>
+    /// <param name="item"></param>
+    public void Add(T item)
+    {
+        current = (++current) % array.Length;
+        array[current] = item;
+        if (used < array.Length)
+            used++;
+        UpdatedInvoke(current, item);
+    }
+
+    /// <summary>
+    /// Добавить новые элементы.<br/>
+    /// Если capacity достигнуто, то вытеснит самые первые элементы.<br/>
+    /// Не вызывает Updated!
+    /// </summary>
+    /// <param name="items"></param>
+    public void AddRange(IEnumerable<T> items)
+    {
+        var capacity = array.Length;
+        var newItems = items.TakeLast(capacity).ToArray();
+        if (newItems.Length == capacity)
+        {
+            Array.Copy(newItems, array, capacity);
+            current = capacity - 1;
+        }
+        else
+        {
+            current = (++current) % capacity;
+            var countToEndOfArray = capacity - current;
+            if (newItems.Length <= countToEndOfArray)
+            {
+                Array.Copy(newItems, 0, array, current, newItems.Length);
+                current += newItems.Length - 1;
+            }
+            else
+            {
+                var firstStepLength = countToEndOfArray;
+                Array.Copy(newItems, 0, array, current, firstStepLength);
+                var secondStepCount = newItems.Length - firstStepLength;
+                Array.Copy(newItems, firstStepLength, array, 0, secondStepCount);
+                current = secondStepCount - 1;
+            }
+        }
+
+        if (used < capacity)
+        {
+            used += newItems.Length;
+            used = used > capacity ? capacity : used;
+        }
+    }
+
+    /// <summary>
+    /// Индекс
+    /// </summary>
+    /// <param name="index"></param>
+    /// <returns></returns>
+    public T this[int index]
+    {
+        get
+        {
+            if (used == 0)
+                throw new IndexOutOfRangeException();
+
+            var i = (current + 1 + index) % used;
+            return array[i];
+        }
+        set
+        {
+            var devider = used > 0 ? used : array.Length;
+            var i = (current + 1 + index) % devider;
+            array[i] = value;
+            UpdatedInvoke(current, value);
+        }
+    }
+
+    /// <summary>
+    /// событие на изменение элемента в массиве
+    /// </summary>
+    public event EventHandler<(int index, T value)>? Updated;
+    private void UpdatedInvoke(int index, T value)
+    {
+        Updated?.Invoke(this, (index, value));
+    }
+
+    /// <summary>
+    /// Агрегирование значения по всему массиву
+    /// </summary>
+    /// <typeparam name="Tout"></typeparam>
+    /// <param name="func"></param>
+    /// <param name="startValue"></param>
+    /// <returns></returns>
+    public Tout Aggregate<Tout>(Func<T, Tout, Tout> func, Tout startValue)
+    {
+        Tout result = startValue;
+        for (int i = 0; i < used; i++)
+            result = func(this[i], result);
+        return result;
+    }
+
+    /// <inheritdoc/>
+    public IEnumerator<T> GetEnumerator()
+        => new CyclycListEnumerator<T>(array, current, used);
+
+    /// <inheritdoc/>
+    IEnumerator IEnumerable.GetEnumerator()
+    => GetEnumerator();
+
+    class CyclycListEnumerator<Te> : IEnumerator<Te>
+    {
+        private readonly Te[] array;
+        private readonly int used;
+        private readonly int first;
+        private int current = -1;
+
+        public CyclycListEnumerator(Te[] array, int first, int used)
+        {
+            this.array = new Te[array.Length];
+            array.CopyTo(this.array, 0);
+            this.used = used;
+            this.first = first;
+        }
+
+        public Te Current
+        {
+            get
+            {
+                if (IsCurrentOk())
+                {
+                    var i = (current + first + 1) % used;
+                    return array[i];
+                }
+                else
+                    return default!;
+            }
+        }
+
+        object? IEnumerator.Current => Current;
+
+        public void Dispose() {; }
+
+        private bool IsCurrentOk() => current >= 0 && current < used;
+
+        public bool MoveNext()
+        {
+            if (current < used)
+                current++;
+            return IsCurrentOk();
+        }
+
+        public void Reset()
+        {
+            current = -1;
+        }
+    }
+
+    /// <summary>
+    /// Очистить весь массив
+    /// </summary>
+    public void Clear()
+    {
+        used = 0;
+        current = -1;
+    }
+}
diff --git a/Persistence.Repository/DependencyInjection.cs b/Persistence.Repository/DependencyInjection.cs
index 21aa538..8e2f759 100644
--- a/Persistence.Repository/DependencyInjection.cs
+++ b/Persistence.Repository/DependencyInjection.cs
@@ -1,11 +1,8 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Persistence.Repositories;
+using Microsoft.Extensions.DependencyInjection;
 using Persistence.Database.Model;
+using Persistence.Repositories;
 using Persistence.Repository.Data;
 using Persistence.Repository.Repositories;
-using Persistence.Database;
 
 namespace Persistence.Repository;
 public static class DependencyInjection
@@ -18,7 +15,7 @@ public static class DependencyInjection
     {
         MapsterSetup();
 
-        services.AddTransient<ITimeSeriesDataRepository<DataSaubDto>, TimeSeriesDataRepository<DataSaub, DataSaubDto>>();
+        services.AddTransient<ITimeSeriesDataRepository<DataSaubDto>, TimeSeriesDataCachedRepository<DataSaub, DataSaubDto>>();
 
         return services;
     }
diff --git a/Persistence.Repository/Repositories/TimeSeriesDataCachedRepository.cs b/Persistence.Repository/Repositories/TimeSeriesDataCachedRepository.cs
new file mode 100644
index 0000000..765c3ce
--- /dev/null
+++ b/Persistence.Repository/Repositories/TimeSeriesDataCachedRepository.cs
@@ -0,0 +1,66 @@
+using Mapster;
+using Microsoft.EntityFrameworkCore;
+using Newtonsoft.Json.Linq;
+using Persistence.Database.Model;
+using Persistence.Models;
+
+namespace Persistence.Repository.Repositories;
+
+public class Test {
+
+}
+
+public class TimeSeriesDataCachedRepository<TEntity, TDto> : TimeSeriesDataRepository<TEntity, TDto>
+    where TEntity : class, ITimestampedData, new()
+    where TDto : class, ITimeSeriesAbstractDto, new()
+{
+    public static TDto FirstByDate { get; set; } = null!;
+    public static CyclicArray<TDto> LastData { get; set; } = null!;
+
+    public TimeSeriesDataCachedRepository(DbContext db) : base(db)
+    {
+        //Task.Run(async () => {
+        //    //FirstByDate = await base.GetFirstAsync(1, CancellationToken.None);
+        //    //LastData = await base.GetLastAsync(3600, CancellationToken.None);
+
+        //}).wait();
+    }
+
+    public override async Task<IEnumerable<TDto>> GetAsync(DateTimeOffset dateBegin, DateTimeOffset dateEnd, CancellationToken token)
+    {
+        var cacheLastData = LastData;
+
+        if (cacheLastData[0].Date > dateBegin)
+        {
+            var dtos = await base.GetAsync(dateBegin, dateEnd, token);
+
+            dtos = dtos.OrderBy(x => x.Date);
+
+            FirstByDate = dtos.ElementAt(0);
+            LastData.AddRange(dtos);
+
+            return dtos;
+        }
+
+        var items = cacheLastData
+            .Where(i => i.Date >= dateBegin && i.Date <= dateEnd);
+
+        return items;
+    }
+
+    public override async Task<int> InsertRange(IEnumerable<TDto> dtos, CancellationToken token)
+    {
+        var result = await base.InsertRange(dtos, token);
+        if (result > 0)
+        {
+            
+            dtos = dtos.OrderBy(x => x.Date);
+
+            FirstByDate = dtos.ElementAt(0);
+            LastData.AddRange(dtos);
+        }
+
+        return result;
+    }
+}
+
diff --git a/Persistence.Repository/Repositories/TimeSeriesDataRepository.cs b/Persistence.Repository/Repositories/TimeSeriesDataRepository.cs
index df8c520..6ad643c 100644
--- a/Persistence.Repository/Repositories/TimeSeriesDataRepository.cs
+++ b/Persistence.Repository/Repositories/TimeSeriesDataRepository.cs
@@ -18,7 +18,7 @@ public class TimeSeriesDataRepository<TEntity, TDto> : ITimeSeriesDataRepository
 
     protected virtual IQueryable<TEntity> GetQueryReadOnly() => this.db.Set<TEntity>();
 
-    public async Task<IEnumerable<TDto>> GetAsync(DateTimeOffset dateBegin, DateTimeOffset dateEnd, CancellationToken token)
+    public virtual async Task<IEnumerable<TDto>> GetAsync(DateTimeOffset dateBegin, DateTimeOffset dateEnd, CancellationToken token)
     {
         var query = GetQueryReadOnly();
         var entities = await query.ToArrayAsync(token);
@@ -27,7 +27,7 @@ public class TimeSeriesDataRepository<TEntity, TDto> : ITimeSeriesDataRepository
         return dtos;
     }
 
-    public async Task<DatesRangeDto> GetDatesRangeAsync(CancellationToken token)
+    public virtual async Task<DatesRangeDto> GetDatesRangeAsync(CancellationToken token)
     {
         var query = GetQueryReadOnly();
         var minDate = await query.MinAsync(o => o.Date, token);
@@ -40,7 +40,7 @@ public class TimeSeriesDataRepository<TEntity, TDto> : ITimeSeriesDataRepository
         };
     }
 
-    public async Task<IEnumerable<TDto>> GetGtDate(DateTimeOffset date, CancellationToken token)
+    public virtual async Task<IEnumerable<TDto>> GetGtDate(DateTimeOffset date, CancellationToken token)
     {
         var query = this.db.Set<TEntity>().Where(e => e.Date > date);
         var entities = await query.ToArrayAsync(token);
@@ -50,7 +50,7 @@ public class TimeSeriesDataRepository<TEntity, TDto> : ITimeSeriesDataRepository
         return dtos;
     }
 
-    public async Task<int> InsertRange(IEnumerable<TDto> dtos, CancellationToken token)
+    public virtual async Task<int> InsertRange(IEnumerable<TDto> dtos, CancellationToken token)
     {
         var entities = dtos.Select(d => d.Adapt<TEntity>());