Rule 9: Raise memory grant warning floor to 1GB, Critical to 4GB

No memory grant warnings should fire below 1GB on modern hardware.
Excessive grant (9a) and large grant (9c) both now require >= 1GB.
Critical severity raised from 512MB to 4GB.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: erikdarlingdata

Dashboard/Services/PlanAnalyzer.cs

@@ -75,7 +75,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
             if (grant.GrantedMemoryKB > 0 && grant.MaxUsedMemoryKB > 0)
             {
                 var wasteRatio = (double)grant.GrantedMemoryKB / grant.MaxUsedMemoryKB;
-                if (wasteRatio >= 10 && grant.GrantedMemoryKB > 1024)
+                if (wasteRatio >= 10 && grant.GrantedMemoryKB >= 1048576)
                 {
                     stmt.PlanWarnings.Add(new PlanWarning
                     {
@@ -98,7 +98,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
             }
 
             // Large memory grant with sort/hash guidance
-            if (grant.GrantedMemoryKB > 102400 && stmt.RootNode != null)
+            if (grant.GrantedMemoryKB >= 1048576 && stmt.RootNode != null)
             {
                 var consumers = new List<string>();
                 FindMemoryConsumers(stmt.RootNode, consumers);
@@ -112,7 +112,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
                 {
                     WarningType = "Large Memory Grant",
                     Message = $"Query granted {grantMB:F0} MB of memory.{guidance}",
-                    Severity = grantMB >= 512 ? PlanWarningSeverity.Critical : PlanWarningSeverity.Warning
+                    Severity = grantMB >= 4096 ? PlanWarningSeverity.Critical : PlanWarningSeverity.Warning
                 });
             }
         }

Lite/Services/PlanAnalyzer.cs

@@ -75,7 +75,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
             if (grant.GrantedMemoryKB > 0 && grant.MaxUsedMemoryKB > 0)
             {
                 var wasteRatio = (double)grant.GrantedMemoryKB / grant.MaxUsedMemoryKB;
-                if (wasteRatio >= 10 && grant.GrantedMemoryKB > 1024)
+                if (wasteRatio >= 10 && grant.GrantedMemoryKB >= 1048576)
                 {
                     stmt.PlanWarnings.Add(new PlanWarning
                     {
@@ -98,7 +98,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
             }
 
             // Large memory grant with sort/hash guidance
-            if (grant.GrantedMemoryKB > 102400 && stmt.RootNode != null)
+            if (grant.GrantedMemoryKB >= 1048576 && stmt.RootNode != null)
             {
                 var consumers = new List<string>();
                 FindMemoryConsumers(stmt.RootNode, consumers);
@@ -112,7 +112,7 @@ private static void AnalyzeStatement(PlanStatement stmt)
                 {
                     WarningType = "Large Memory Grant",
                     Message = $"Query granted {grantMB:F0} MB of memory.{guidance}",
-                    Severity = grantMB >= 512 ? PlanWarningSeverity.Critical : PlanWarningSeverity.Warning
+                    Severity = grantMB >= 4096 ? PlanWarningSeverity.Critical : PlanWarningSeverity.Warning
                 });
             }
         }