refactor: Fixed Custom Session Band Display & Lifetime Management

Indicators/MyIndicators/Authors/Kaufman/KAMA_Anchored_Bands_Pro.mq5

@@ -3,9 +3,9 @@
 //|                                          Copyright 2026, xxxxxxxx|
 //+------------------------------------------------------------------+
 #property copyright "Copyright 2026, xxxxxxxx"
-#property version   "1.00" // First Anchored KAMA with Volatility Standard Deviation Bands release
+#property version   "2.10" // Fixed Custom Session Band Display & Lifetime Management
 #property description "Session-Anchored Kaufman's Adaptive Moving Average (AKAMA) with Standard Deviation Bands."
-#property description "Features odd/even gapped lines and current session focus."
+#property description "Features robust Custom Session handling, non-repainting MTF mapping, and current session focus."
 
 #property indicator_chart_window
 #property indicator_buffers 8
@@ -16,13 +16,13 @@
 #property indicator_type1   DRAW_LINE
 #property indicator_color1  clrOrange
 #property indicator_style1  STYLE_SOLID
-#property indicator_width1  2
+#property indicator_width1  1
 
 #property indicator_label2  ""
 #property indicator_type2   DRAW_LINE
 #property indicator_color2  clrOrange
 #property indicator_style2  STYLE_SOLID
-#property indicator_width2  2
+#property indicator_width2  1
 
 //--- Plot 3-4: Band 1 (+/- 1.0 Sigma)
 #property indicator_label3  "Upper Band 1"
@@ -35,7 +35,7 @@
 #property indicator_type4   DRAW_LINE
 #property indicator_color4  clrDodgerBlue
 #property indicator_style4  STYLE_SOLID
-#property indicator_width4  1
+#property indicator_width3  1
 
 //--- Plot 5-6: Band 2 (+/- 2.0 Sigma)
 #property indicator_label5  "Upper Band 2"
@@ -63,10 +63,14 @@
 #property indicator_style8  STYLE_SOLID
 #property indicator_width8  1
 
-//--- Included Engines
+//--- Included Engines & Central Tools
 #include <MyIncludes\KAMA_Anchored_Calculator.mqh>
+#include <MyIncludes\DataSync_Tools.mqh>
 
 //--- Input Parameters ---
+input group "--- Timeframe Settings ---"
+input ENUM_TIMEFRAMES           InpTimeframe        = PERIOD_CURRENT;        // Calculation Timeframe (Current or HTF)
+
 input group "--- Anchor Settings ---"
 input ENUM_ANCHOR_PERIOD        InpResetPeriod      = ANCHOR_PERIOD_SESSION; // Anchor Reset Period
 input int                       InpTzShift          = 0;                     // Timezone Shift (Hours)
@@ -83,12 +87,12 @@ input group "--- Standard Deviation Bands Settings ---"
 input double                    InpBand1Mult        = 1.0;                   // Band 1 Multiplier (Sigma)
 input double                    InpBand2Mult        = 2.0;                   // Band 2 Multiplier (Sigma)
 input double                    InpBand3Mult        = 3.0;                   // Band 3 Multiplier (Sigma)
-input bool                      InpCurrentSessionOnly= true;                 // Display Bands for Current Session Only?
+input bool                      InpCurrentSessionOnly= true;                 // Display Bands for Most Recent Session Only?
 
 input group "--- Visual Settings - AKAMA Centerline ---"
 input color                     InpColorKAMA        = clrOrange;             // Centerline Color
 input ENUM_LINE_STYLE           InpStyleKAMA        = STYLE_SOLID;           // Centerline Style
-input int                       InpWidthKAMA        = 2;                     // Centerline Width
+input int                       InpWidthKAMA        = 1;                     // Centerline Width
 
 input group "--- Visual Settings - Bands Colors ---"
 input color                     InpColorBand1       = clrDodgerBlue;         // Band 1 Color (+/- 1σ)
@@ -102,18 +106,51 @@ double BufUp1[], BufDn1[];
 double BufUp2[], BufDn2[];
 double BufUp3[], BufDn3[];
 
-//--- Internal State Buffer
+//--- Internal State Buffer (Current Timeframe)
 double g_price_series[];
 
-//--- Calculator Object
+//--- Internal HTF Data Caches (Chronological Arrays)
+double h_open[], h_high[], h_low[], h_close[], h_price[];
+double h_res_odd[], h_res_even[];
+double h_res_up1[], h_res_dn1[];
+double h_res_up2[], h_res_dn2[];
+double h_res_up3[], h_res_dn3[];
+datetime h_time[];
+
+//--- Global Objects & State Management
 CKamaAnchoredCalculator *g_calculator = NULL;
 
+bool            g_is_mtf_mode         = false;
+ENUM_TIMEFRAMES g_calc_timeframe;
+bool            g_data_ready          = false;
+bool            g_data_synced         = false;
+int             g_htf_count           = 0;
+datetime        g_last_htf_time       = 0;
+
 //+------------------------------------------------------------------+
 //| Custom Indicator Initialization                                  |
 //+------------------------------------------------------------------+
 int OnInit()
   {
-// 1. Bind Buffers
+   g_data_ready    = false;
+   g_data_synced   = false;
+   g_htf_count     = 0;
+   g_last_htf_time = 0;
+
+// 1. Resolve Timeframe and validate direction
+   g_calc_timeframe = InpTimeframe;
+   if(g_calc_timeframe == PERIOD_CURRENT)
+      g_calc_timeframe = (ENUM_TIMEFRAMES)Period();
+
+   if(g_calc_timeframe < Period())
+     {
+      PrintFormat("Critical Error: Target timeframe (%s) must be >= current timeframe (%s).",
+                  EnumToString(g_calc_timeframe), EnumToString(Period()));
+      return INIT_PARAMETERS_INCORRECT;
+     }
+   g_is_mtf_mode = (g_calc_timeframe > Period());
+
+// 2. Bind Buffers
    SetIndexBuffer(0, BufKAMA_Odd,  INDICATOR_DATA);
    SetIndexBuffer(1, BufKAMA_Even, INDICATOR_DATA);
    SetIndexBuffer(2, BufUp1,       INDICATOR_DATA);
@@ -123,11 +160,8 @@ int OnInit()
    SetIndexBuffer(6, BufUp3,       INDICATOR_DATA);
    SetIndexBuffer(7, BufDn3,       INDICATOR_DATA);
 
-// Force strict chronological alignment (0 = oldest)
    for(int i = 0; i < 8; i++)
-     {
       PlotIndexSetDouble(i, PLOT_EMPTY_VALUE, EMPTY_VALUE);
-     }
 
    ArraySetAsSeries(BufKAMA_Odd,  false);
    ArraySetAsSeries(BufKAMA_Even, false);
@@ -147,7 +181,7 @@ int OnInit()
    ArrayInitialize(BufUp3,       EMPTY_VALUE);
    ArrayInitialize(BufDn3,       EMPTY_VALUE);
 
-// 2. Configure Dynamic Visual Styling
+// 3. Configure Dynamic Visual Styling
    PlotIndexSetInteger(0, PLOT_LINE_COLOR, InpColorKAMA);
    PlotIndexSetInteger(0, PLOT_LINE_STYLE, InpStyleKAMA);
    PlotIndexSetInteger(0, PLOT_LINE_WIDTH, InpWidthKAMA);
@@ -164,7 +198,7 @@ int OnInit()
    PlotIndexSetInteger(6, PLOT_LINE_COLOR, InpColorBand3);
    PlotIndexSetInteger(7, PLOT_LINE_COLOR, InpColorBand3);
 
-// 3. Initialize Anchored KAMA Engine
+// 4. Initialize Anchored KAMA Engine
    g_calculator = new CKamaAnchoredCalculator();
    if(CheckPointer(g_calculator) == POINTER_INVALID ||
       !g_calculator.Init(InpResetPeriod, InpTzShift, InpCustomStart, InpCustomEnd,
@@ -175,11 +209,16 @@ int OnInit()
      }
 
    string ha_tag = (InpSourcePrice <= PRICE_HA_CLOSE) ? " HA" : "";
-   string short_name = StringFormat("AKAMA Bands%s(%s, ER%d)",
+   string tf_str = g_is_mtf_mode ? (" [" + EnumToString(g_calc_timeframe) + "]") : "";
-                                    ha_tag, EnumToString(InpResetPeriod), InpErPeriod);
+   string short_name = StringFormat("AKAMA Bands%s%s(%s, ER%d)",
+                                    ha_tag, tf_str, EnumToString(InpResetPeriod), InpErPeriod);
    IndicatorSetString(INDICATOR_SHORTNAME, short_name);
    IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
 
+// 5. Initialize Background Synchronization Timer (Only for MTF mode)
+   if(g_is_mtf_mode)
+      EventSetTimer(1);
+
    return(INIT_SUCCEEDED);
   }
 
@@ -188,6 +227,9 @@ int OnInit()
 //+------------------------------------------------------------------+
 void OnDeinit(const int reason)
   {
+   if(g_is_mtf_mode)
+      EventKillTimer();
+
    if(CheckPointer(g_calculator) != POINTER_INVALID)
      {
       delete g_calculator;
@@ -195,6 +237,101 @@ void OnDeinit(const int reason)
      }
   }
 
+//+------------------------------------------------------------------+
+//| Helper: Compute Running Variance Bands                           |
+//+------------------------------------------------------------------+
+void CalculateBandsFromAKAMA(const int total_bars,
+                             const double &kama_odd_arr[],
+                             const double &kama_even_arr[],
+                             const double &price_arr[],
+                             const bool current_session_only,
+                             double &up1[], double &dn1[],
+                             double &up2[], double &dn2[],
+                             double &up3[], double &dn3[])
+  {
+   ArrayInitialize(up1, EMPTY_VALUE);
+   ArrayInitialize(dn1, EMPTY_VALUE);
+   ArrayInitialize(up2, EMPTY_VALUE);
+   ArrayInitialize(dn2, EMPTY_VALUE);
+   ArrayInitialize(up3, EMPTY_VALUE);
+   ArrayInitialize(dn3, EMPTY_VALUE);
+
+// 1. Identify the Most Recent Active/Closed Session
+   int most_recent_end   = -1;
+   int most_recent_start = -1;
+
+   for(int i = total_bars - 1; i >= 0; i--)
+     {
+      if(kama_odd_arr[i] != EMPTY_VALUE || kama_even_arr[i] != EMPTY_VALUE)
+        {
+         most_recent_end = i;
+         break;
+        }
+     }
+
+   if(most_recent_end >= 0)
+     {
+      bool is_odd_target = (kama_odd_arr[most_recent_end] != EMPTY_VALUE);
+      most_recent_start  = most_recent_end;
+
+      for(int i = most_recent_end; i >= 0; i--)
+        {
+         bool is_valid = is_odd_target ? (kama_odd_arr[i] != EMPTY_VALUE) : (kama_even_arr[i] != EMPTY_VALUE);
+         if(!is_valid)
+            break;
+         most_recent_start = i;
+        }
+     }
+
+// 2. Calculate Standard Deviation Bands
+   int start_bar = (current_session_only && most_recent_start >= 0) ? most_recent_start : 0;
+   int end_bar   = (current_session_only && most_recent_end >= 0) ? most_recent_end : (total_bars - 1);
+
+   double sum_sq_dev = 0.0;
+   int    count = 0;
+   int    last_session_tag = 0; // 0=None, 1=Odd, 2=Even
+
+   for(int i = start_bar; i <= end_bar; i++)
+     {
+      bool is_odd = (kama_odd_arr[i] != EMPTY_VALUE);
+      bool is_even = (kama_even_arr[i] != EMPTY_VALUE);
+
+      if(!is_odd && !is_even)
+        {
+         // In gap between sessions
+         last_session_tag = 0;
+         sum_sq_dev = 0.0;
+         count = 0;
+         continue;
+        }
+
+      int session_tag = is_odd ? 1 : 2;
+      if(session_tag != last_session_tag)
+        {
+         sum_sq_dev = 0.0;
+         count = 0;
+         last_session_tag = session_tag;
+        }
+
+      double akama = is_odd ? kama_odd_arr[i] : kama_even_arr[i];
+      if(akama > 0.0)
+        {
+         double diff = price_arr[i] - akama;
+         sum_sq_dev += (diff * diff);
+         count++;
+
+         double stddev = (count > 0) ? MathSqrt(sum_sq_dev / (double)count) : 0.0;
+
+         up1[i] = akama + (InpBand1Mult * stddev);
+         dn1[i] = akama - (InpBand1Mult * stddev);
+         up2[i] = akama + (InpBand2Mult * stddev);
+         dn2[i] = akama - (InpBand2Mult * stddev);
+         up3[i] = akama + (InpBand3Mult * stddev);
+         dn3[i] = akama - (InpBand3Mult * stddev);
+        }
+     }
+  }
+
 //+------------------------------------------------------------------+
 //| Custom Indicator Calculation Loop                                |
 //+------------------------------------------------------------------+
@@ -209,7 +346,8 @@ int OnCalculate(const int rates_total,
                 const long &volume[],
                 const int &spread[])
   {
-   if(rates_total < 2 || CheckPointer(g_calculator) == POINTER_INVALID)
+   int required_bars = InpErPeriod + 10;
+   if(rates_total < required_bars || CheckPointer(g_calculator) == POINTER_INVALID)
       return 0;
 
 // Chronological Array Safety
@@ -219,80 +357,185 @@ int OnCalculate(const int rates_total,
    ArraySetAsSeries(low,   false);
    ArraySetAsSeries(close, false);
 
-// 1. Run Anchored KAMA Engine (Fills Odd/Even Buffers & Extracts Price)
+//===================================================================
-   g_calculator.Calculate(rates_total, prev_calculated, time, open, high, low, close,
+// MODE 1: Direct Current Timeframe Calculation (Zero-Lag O(1))
-                          BufKAMA_Odd, BufKAMA_Even, g_price_series);
+//===================================================================
-
+   if(!g_is_mtf_mode)
-// 2. Identify the Start Index of the Current Active Session
-   int current_session_start = 0;
-
-   for(int i = rates_total - 1; i > 0; i--)
      {
-      bool is_odd_now  = (BufKAMA_Odd[i] != EMPTY_VALUE);
+      // 1. Run Anchored KAMA Engine
-      bool is_odd_prev = (BufKAMA_Odd[i - 1] != EMPTY_VALUE);
+      g_calculator.Calculate(rates_total, prev_calculated, time, open, high, low, close,
+                             BufKAMA_Odd, BufKAMA_Even, g_price_series);
 
-      if(is_odd_now != is_odd_prev)
+      // 2. Calculate Standard Deviation Bands with Safe Lifetime Handling
+      CalculateBandsFromAKAMA(rates_total, BufKAMA_Odd, BufKAMA_Even, g_price_series, InpCurrentSessionOnly,
+                              BufUp1, BufDn1, BufUp2, BufDn2, BufUp3, BufDn3);
+
+      return rates_total;
+     }
+
+//===================================================================
+// MODE 2: Multi-Timeframe Engine (Warp-free Step Synchronization)
+//===================================================================
+   if(!CDataSync::EnsureHTFDataReady(_Symbol, g_calc_timeframe, required_bars))
+     {
+      g_data_synced = false;
+      return 0;
+     }
+
+   g_data_synced = true;
+
+   datetime htf_time_current = iTime(_Symbol, g_calc_timeframe, 0);
+   bool htf_updated = (htf_time_current != g_last_htf_time);
+
+   if(htf_updated || prev_calculated == 0)
+     {
+      g_last_htf_time = htf_time_current;
+
+      int htf_bars = iBars(_Symbol, g_calc_timeframe);
+      if(htf_bars < required_bars)
         {
-         current_session_start = i;
+         g_data_ready = false;
-         break;
+         return 0;
+        }
+
+      g_htf_count = MathMin(htf_bars, 3000); // Memory safeguard
+
+      // Resize all HTF caching arrays
+      ArrayResize(h_time,     g_htf_count);
+      ArrayResize(h_open,     g_htf_count);
+      ArrayResize(h_high,     g_htf_count);
+      ArrayResize(h_low,      g_htf_count);
+      ArrayResize(h_close,    g_htf_count);
+      ArrayResize(h_price,    g_htf_count);
+      ArrayResize(h_res_odd,  g_htf_count);
+      ArrayResize(h_res_even, g_htf_count);
+      ArrayResize(h_res_up1,  g_htf_count);
+      ArrayResize(h_res_dn1,  g_htf_count);
+      ArrayResize(h_res_up2,  g_htf_count);
+      ArrayResize(h_res_dn2,  g_htf_count);
+      ArrayResize(h_res_up3,  g_htf_count);
+      ArrayResize(h_res_dn3,  g_htf_count);
+
+      // Force chronological alignment
+      ArraySetAsSeries(h_time,     false);
+      ArraySetAsSeries(h_open,     false);
+      ArraySetAsSeries(h_high,     false);
+      ArraySetAsSeries(h_low,      false);
+      ArraySetAsSeries(h_close,    false);
+      ArraySetAsSeries(h_price,    false);
+      ArraySetAsSeries(h_res_odd,  false);
+      ArraySetAsSeries(h_res_even, false);
+      ArraySetAsSeries(h_res_up1,  false);
+      ArraySetAsSeries(h_res_dn1,  false);
+      ArraySetAsSeries(h_res_up2,  false);
+      ArraySetAsSeries(h_res_dn2,  false);
+      ArraySetAsSeries(h_res_up3,  false);
+      ArraySetAsSeries(h_res_dn3,  false);
+
+      // Copy pricing data
+      if(CopyTime(_Symbol,  g_calc_timeframe, 0, g_htf_count, h_time)  != g_htf_count ||
+         CopyOpen(_Symbol,  g_calc_timeframe, 0, g_htf_count, h_open)  != g_htf_count ||
+         CopyHigh(_Symbol,  g_calc_timeframe, 0, g_htf_count, h_high)  != g_htf_count ||
+         CopyLow(_Symbol,   g_calc_timeframe, 0, g_htf_count, h_low)   != g_htf_count ||
+         CopyClose(_Symbol, g_calc_timeframe, 0, g_htf_count, h_close) != g_htf_count)
+        {
+         g_data_ready = false;
+         return 0;
+        }
+
+      // Compute HTF Anchored KAMA Values
+      g_calculator.Calculate(g_htf_count, 0, h_time, h_open, h_high, h_low, h_close,
+                             h_res_odd, h_res_even, h_price);
+
+      // Calculate HTF Standard Deviation Bands (All HTF history computed)
+      CalculateBandsFromAKAMA(g_htf_count, h_res_odd, h_res_even, h_price, false,
+                              h_res_up1, h_res_dn1, h_res_up2, h_res_dn2, h_res_up3, h_res_dn3);
+
+      g_data_ready = true;
+     }
+
+   if(!g_data_ready)
+      return 0;
+
+// 5. Stateful live-bar update for the active forming HTF candle
+   int live_idx = g_htf_count - 1;
+   if(live_idx >= required_bars)
+     {
+      double o[1], h[1], l[1], c[1];
+      datetime t_bar[1];
+      int shift = iBarShift(_Symbol, g_calc_timeframe, htf_time_current, false);
+      if(shift >= 0 &&
+         CopyTime(_Symbol,  g_calc_timeframe, shift, 1, t_bar) == 1 &&
+         CopyOpen(_Symbol,  g_calc_timeframe, shift, 1, o) == 1 &&
+         CopyHigh(_Symbol,  g_calc_timeframe, shift, 1, h) == 1 &&
+         CopyLow(_Symbol,   g_calc_timeframe, shift, 1, l) == 1 &&
+         CopyClose(_Symbol, g_calc_timeframe, shift, 1, c) == 1)
+        {
+         h_time[live_idx]  = t_bar[0];
+         h_open[live_idx]  = o[0];
+         h_high[live_idx]  = h[0];
+         h_low[live_idx]   = l[0];
+         h_close[live_idx] = c[0];
+
+         // Mock update on live bar
+         g_calculator.Calculate(g_htf_count, g_htf_count, h_time, h_open, h_high, h_low, h_close,
+                                h_res_odd, h_res_even, h_price);
+
+         CalculateBandsFromAKAMA(g_htf_count, h_res_odd, h_res_even, h_price, false,
+                                 h_res_up1, h_res_dn1, h_res_up2, h_res_dn2, h_res_up3, h_res_dn3);
         }
      }
 
-// 3. Clear Old Bands if a New Session just started (If CurrentSessionOnly is true)
+// 6. Forming LTF Block Flat-Force Anchor (The Staircase Solution)
-   static int prev_session_start = -1;
+   int start = (prev_calculated > 0) ? prev_calculated - 1 : 0;
-   if(InpCurrentSessionOnly && current_session_start != prev_session_start)
+
+   int first_bar_of_forming_htf = rates_total - 1;
+   while(first_bar_of_forming_htf > 0 &&
+         iBarShift(_Symbol, g_calc_timeframe, time[first_bar_of_forming_htf], false) == 0)
      {
-      for(int i = 0; i < current_session_start; i++)
+      first_bar_of_forming_htf--;
-        {
-         BufUp1[i] = EMPTY_VALUE;
-         BufDn1[i] = EMPTY_VALUE;
-         BufUp2[i] = EMPTY_VALUE;
-         BufDn2[i] = EMPTY_VALUE;
-         BufUp3[i] = EMPTY_VALUE;
-         BufDn3[i] = EMPTY_VALUE;
-        }
-      prev_session_start = current_session_start;
      }
+   first_bar_of_forming_htf++;
 
-// 4. Calculate Standard Deviation Bands
+   if(start > first_bar_of_forming_htf)
-   int calc_start = InpCurrentSessionOnly ? current_session_start : 0;
+      start = first_bar_of_forming_htf;
 
-   double sum_sq_dev = 0.0;
+// 7. Chronological Mapping Loop to Chart Timeframe
-   int    count = 0;
+   for(int i = start; i < rates_total; i++)
-   int    last_session_idx = -1;
-
-   for(int i = calc_start; i < rates_total; i++)
      {
-      // Reset accumulators when session flips (in All Sessions mode)
+      datetime t = time[i];
-      bool is_odd = (BufKAMA_Odd[i] != EMPTY_VALUE);
+      int shift_htf = iBarShift(_Symbol, g_calc_timeframe, t, false);
-      int session_id = is_odd ? 1 : 2;
 
-      if(session_id != last_session_idx)
+      if(shift_htf >= 0)
         {
-         sum_sq_dev = 0.0;
+         int idx_htf = g_htf_count - 1 - shift_htf;
-         count = 0;
+         if(idx_htf >= 0 && idx_htf < g_htf_count)
-         last_session_idx = session_id;
+           {
-        }
+            BufKAMA_Odd[i]  = h_res_odd[idx_htf];
-
+            BufKAMA_Even[i] = h_res_even[idx_htf];
-      double akama = is_odd ? BufKAMA_Odd[i] : BufKAMA_Even[i];
+            BufUp1[i]       = h_res_up1[idx_htf];
-
+            BufDn1[i]       = h_res_dn1[idx_htf];
-      if(akama != EMPTY_VALUE && akama > 0.0)
+            BufUp2[i]       = h_res_up2[idx_htf];
-        {
+            BufDn2[i]       = h_res_dn2[idx_htf];
-         double diff = g_price_series[i] - akama;
+            BufUp3[i]       = h_res_up3[idx_htf];
-         sum_sq_dev += (diff * diff);
+            BufDn3[i]       = h_res_dn3[idx_htf];
-         count++;
+           }
-
+         else
-         double stddev = MathSqrt(sum_sq_dev / (double)count);
+           {
-
+            BufKAMA_Odd[i] = EMPTY_VALUE;
-         BufUp1[i] = akama + (InpBand1Mult * stddev);
+            BufKAMA_Even[i] = EMPTY_VALUE;
-         BufDn1[i] = akama - (InpBand1Mult * stddev);
+            BufUp1[i] = EMPTY_VALUE;
-         BufUp2[i] = akama + (InpBand2Mult * stddev);
+            BufDn1[i] = EMPTY_VALUE;
-         BufDn2[i] = akama - (InpBand2Mult * stddev);
+            BufUp2[i] = EMPTY_VALUE;
-         BufUp3[i] = akama + (InpBand3Mult * stddev);
+            BufDn2[i] = EMPTY_VALUE;
-         BufDn3[i] = akama - (InpBand3Mult * stddev);
+            BufUp3[i] = EMPTY_VALUE;
+            BufDn3[i] = EMPTY_VALUE;
+           }
         }
       else
         {
+         BufKAMA_Odd[i] = EMPTY_VALUE;
+         BufKAMA_Even[i] = EMPTY_VALUE;
          BufUp1[i] = EMPTY_VALUE;
          BufDn1[i] = EMPTY_VALUE;
          BufUp2[i] = EMPTY_VALUE;
@@ -302,7 +545,57 @@ int OnCalculate(const int rates_total,
         }
      }
 
+// 8. Mask Older Session Bands if CurrentSessionOnly is true on LTF
+   if(InpCurrentSessionOnly)
+     {
+      int most_recent_ltf_end   = -1;
+      int most_recent_ltf_start = -1;
+
+      for(int i = rates_total - 1; i >= 0; i--)
+        {
+         if(BufKAMA_Odd[i] != EMPTY_VALUE || BufKAMA_Even[i] != EMPTY_VALUE)
+           {
+            most_recent_ltf_end = i;
+            break;
+           }
+        }
+
+      if(most_recent_ltf_end >= 0)
+        {
+         bool is_odd_target = (BufKAMA_Odd[most_recent_ltf_end] != EMPTY_VALUE);
+         most_recent_ltf_start = most_recent_ltf_end;
+
+         for(int i = most_recent_ltf_end; i >= 0; i--)
+           {
+            bool is_valid = is_odd_target ? (BufKAMA_Odd[i] != EMPTY_VALUE) : (BufKAMA_Even[i] != EMPTY_VALUE);
+            if(!is_valid)
+               break;
+            most_recent_ltf_start = i;
+           }
+
+         // Wipe bands before the most recent active session
+         for(int i = 0; i < most_recent_ltf_start; i++)
+           {
+            BufUp1[i] = EMPTY_VALUE;
+            BufDn1[i] = EMPTY_VALUE;
+            BufUp2[i] = EMPTY_VALUE;
+            BufDn2[i] = EMPTY_VALUE;
+            BufUp3[i] = EMPTY_VALUE;
+            BufDn3[i] = EMPTY_VALUE;
+           }
+        }
+     }
+
    return rates_total;
   }
+
+//+------------------------------------------------------------------+
+//| OnTimer Event Handler (Data Synchronization Daemon)              |
+//+------------------------------------------------------------------+
+void OnTimer()
+  {
+   int required_bars = InpErPeriod + 10;
+   CDataSync::OnTimerUpdate(_Symbol, g_calc_timeframe, required_bars, g_data_synced);
+  }
 //+------------------------------------------------------------------+
 //+------------------------------------------------------------------+