From 67aa1bd0cf2b75f85fc771ffcccb308fd6a56a50 Mon Sep 17 00:00:00 2001
From: Sean <skessler1964@gmail.com>
Date: Thu, 26 Feb 2026 16:51:29 -0500
Subject: [PATCH] Merge MKDT_0003

---
 MarketDataLib/Cache/GLPriceCache.cs | 18 ++++++++++--------
 Program.cs                          |  1 +
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/MarketDataLib/Cache/GLPriceCache.cs b/MarketDataLib/Cache/GLPriceCache.cs
index 9e8269f..bbdcbd4 100644
--- a/MarketDataLib/Cache/GLPriceCache.cs
+++ b/MarketDataLib/Cache/GLPriceCache.cs
@@ -66,8 +66,12 @@ namespace MarketData.Cache
         List<string> symbols = portfolioTrades.Symbols;
         DateTime today = DateTime.Today;
 
-        Dictionary<string, DateTime> minTradeDates = symbols.ToDictionary(
-            sym => sym, sym => portfolioTrades.GetMinTradeDate(sym));
+        // Default: 3x logical cores, capped at 32 to avoid saturating the connection pool.
+        // I/O-bound DB calls benefit from more threads than CPU cores, but diminishing
+        // returns set in beyond ~32 concurrent connections for most DB workloads.
+        int defaultParallelism = Math.Min(Environment.ProcessorCount * 3, 32);
+
+        Dictionary<string, DateTime> minTradeDates = symbols.ToDictionary(symbol => symbol, symbol => portfolioTrades.GetMinTradeDate(symbol));
 
         // Symbols that need an intraday refresh:
         // - open positions (no close date), or
@@ -78,15 +82,13 @@ namespace MarketData.Cache
         Dictionary<string, DateTime> minCacheDates;
         lock (thisLock)
         {
-            minCacheDates = symbols.ToDictionary(
-                sym => sym,
-                sym => priceCache.ContainsKey(sym) ? priceCache[sym].MinDate : DateTime.MaxValue);
+            minCacheDates = symbols.ToDictionary(symbol => symbol,symbol => priceCache.ContainsKey(symbol) ? priceCache[symbol].MinDate : DateTime.MaxValue);
         }
 
         ConcurrentDictionary<string, Prices> fetchedPrices = new ConcurrentDictionary<string, Prices>();
         ConcurrentDictionary<string, Price> latestPrices = new ConcurrentDictionary<string, Price>();
 
-        Parallel.ForEach(symbols, new ParallelOptions { MaxDegreeOfParallelism = 8 }, symbol =>
+        Parallel.ForEach(symbols, new ParallelOptions { MaxDegreeOfParallelism = defaultParallelism }, symbol =>
         {
             DateTime minTradeDate = minTradeDates[symbol];
             DateTime minCacheDate = minCacheDates[symbol];
@@ -126,7 +128,7 @@ namespace MarketData.Cache
         lock (thisLock)
         {
             // Historical prices — idempotent, will not overwrite existing entries
-            foreach (var kvp in fetchedPrices)
+            foreach (KeyValuePair<string, Prices> kvp in fetchedPrices)
             {
                 foreach (var price in kvp.Value)
                 {
@@ -135,7 +137,7 @@ namespace MarketData.Cache
             }
 
             // Latest prices — unconditional overwrite to capture any intraday updates
-            foreach (var kvp in latestPrices)
+            foreach (KeyValuePair<string, Price> kvp in latestPrices)
             {
                 if (!priceCache.TryGetValue(kvp.Key, out var pricesByDate))
                 {
diff --git a/Program.cs b/Program.cs
index 5aeb1d4..b9501cf 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1857,6 +1857,7 @@ namespace MarketData
       {
         LocalPriceCache.GetInstance().Dispose();
         GBPriceCache.GetInstance().Dispose();
+        GLPriceCache.GetInstance().Dispose();
       }
     }     // main
 // *****************************************************************************************************************************************************************************