fix: address code review issues in indicators and core components

lib/core/ringbuffer/RingBuffer.cs

@@ -82,6 +82,22 @@ public sealed class RingBuffer : IEnumerable<double>
         get => _sum;
     }
 
+    /// <summary>
+    /// Recalculates the sum by iterating over all elements.
+    /// Useful for correcting floating-point drift after many updates.
+    /// </summary>
+    public double RecalculateSum()
+    {
+        double sum = 0;
+        var span = GetSpan();
+        for (int i = 0; i < span.Length; i++)
+        {
+            sum += span[i];
+        }
+        _sum = sum;
+        return sum;
+    }
+
     /// <summary>
     /// Average of all elements in the buffer.
     /// Returns 0 if buffer is empty.

lib/core/tbarseries/tbarseries.cs

@@ -129,12 +129,10 @@ public class TBarSeries : IReadOnlyList<TBar>
             throw new ArgumentException("All arrays must have the same length");
         }
 
-        _t.AddRange(tArr);
-        _o.AddRange(oArr);
-        _h.AddRange(hArr);
-        _l.AddRange(lArr);
-        _c.AddRange(cArr);
-        _v.AddRange(vArr);
+        for (int i = 0; i < tArr.Length; i++)
+        {
+            Add(tArr[i], oArr[i], hArr[i], lArr[i], cArr[i], vArr[i]);
+        }
     }
 
     public IEnumerator<TBar> GetEnumerator()

lib/core/tvalue/tvalue.cs

@@ -24,7 +24,7 @@ public readonly struct TValue : IEquatable<TValue>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public TValue(DateTime time, double value)
     {
-        Time = time.Ticks;
+        Time = time.Kind == DateTimeKind.Utc ? time.Ticks : time.ToUniversalTime().Ticks;
         Value = value;
     }
 
@@ -38,7 +38,7 @@ public readonly struct TValue : IEquatable<TValue>
     public override string ToString() => $"[{AsDateTime:yyyy-MM-dd HH:mm:ss}, {Value:F2}]";
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public bool Equals(TValue other) => Time == other.Time && Math.Abs(Value - other.Value) < 1e-9;
+    public bool Equals(TValue other) => Time == other.Time && Value == other.Value;
 
     public override bool Equals(object? obj) => obj is TValue other && Equals(other);
     public override int GetHashCode() => HashCode.Combine(Time, Value);