chore(sonar): bulk-fix mechanical CA/IDE analyzer warnings

Applied via `dotnet format analyzers --diagnostics IDE0028 CA1825 CA1834
CA1845 CA1847 CA1860 CA1866 CA1853 CA1830 CA1846 CA1806 CA1869 CA2249
--severity info`. 19 files touched, all mechanical syntactic rewrites:

- CA1847: string.Contains("x") -> string.Contains('x')
- CA2249: s.IndexOf(c) == -1 -> !s.Contains(c)
- CA1830: sb.Append(sb.ToString()) -> sb.Append(sb)
- CA1834: StringBuilder.Append("x") -> Append('x')
- CA1825, CA1860, CA1866, CA1853, IDE0028, CA1845: corresponding fixers

Three rules in the batch had no batch fixer available (CA1846 ×4,
CA1806 ×1, CA1869 ×1) and stay open for separate manual handling.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Strata.SqlTools.LinqToSql/Breakdowns/LinqQueryBreakdown.cs

@@ -580,7 +580,7 @@ public class LinqQueryBreakdown : QueryBreakdown
     /// <returns>True if SELECT contains *; otherwise, false.</returns>
     public bool SelectsAllColumns()
     {
-        return SelectClause?.Clause?.Contains("*") ?? false;
+        return SelectClause?.Clause?.Contains('*') ?? false;
     }
 
     /// <summary>

src/Strata.SqlTools.LinqToSql/Visitors/LinqExpressionVisitor.cs

@@ -248,13 +248,13 @@ public class LinqExpressionVisitor : ExpressionVisitor
     {
         if (_isInWhereClause)
         {
-            _whereBuilder.Append("(");
+            _whereBuilder.Append('(');
             Visit(node.Left);
 
             _whereBuilder.Append($" {GetOperator(node.NodeType)} ");
 
             Visit(node.Right);
-            _whereBuilder.Append(")");
+            _whereBuilder.Append(')');
 
             return node;
         }

src/Strata.SqlTools.Markdown/Expressions/ExpressionGenerator.cs

@@ -366,7 +366,7 @@ public class ExpressionGenerator : IVisitor<string>
         {
             return text;
         }
-        return text.Substring(0, maxLength) + "...";
+        return string.Concat(text.AsSpan(0, maxLength), "...");
     }
 
     #region IVisitor Implementation
@@ -583,7 +583,7 @@ public class ExpressionGenerator : IVisitor<string>
     {
         var sb = new StringBuilder();
         sb.AppendLine($"{Indent()}Function: {function.FunctionName}");
-        if (function.Arguments.Any())
+        if (function.Arguments.Length != 0)
         {
             _indentLevel++;
             sb.AppendLine($"{Indent()}Arguments:");
@@ -602,7 +602,7 @@ public class ExpressionGenerator : IVisitor<string>
     {
         var sb = new StringBuilder();
         sb.AppendLine($"{Indent()}Aggregate Function: {aggregateFunction.FunctionName}");
-        if (aggregateFunction.Arguments.Any())
+        if (aggregateFunction.Arguments.Length != 0)
         {
             _indentLevel++;
             sb.AppendLine($"{Indent()}Arguments:");

src/Strata.SqlTools.Markdown/SqlServer/QueryBreakdownGenerator.cs

@@ -201,7 +201,7 @@ public class QueryBreakdownGenerator
             return text;
         }
 
-        return text.Substring(0, maxLength) + "...";
+        return string.Concat(text.AsSpan(0, maxLength), "...");
     }
 }
 

src/Strata.SqlTools.Markdown/SqlServer/SqlStatementGenerator.cs

@@ -122,7 +122,7 @@ public class SqlStatementGenerator
             return text;
         }
 
-        return text.Substring(0, maxLength) + "...";
+        return string.Concat(text.AsSpan(0, maxLength), "...");
     }
 
     /// <summary>

src/Strata.SqlTools.PostgreSql/Statements/StatementExpressionParser.cs

@@ -129,7 +129,7 @@ public class StatementExpressionParser : SqlServerStatementExpressionParser
 
                 if (reader.TokenType == TokenType.String || reader.TokenType == TokenType.ColumnIdentifier)
                 {
-                    columnBuilder.Append(".").Append(reader.TokenValue);
+                    columnBuilder.Append('.').Append(reader.TokenValue);
                     reader.Read();
                 }
                 else
@@ -191,7 +191,7 @@ public class StatementExpressionParser : SqlServerStatementExpressionParser
 
             if (reader.TokenType == TokenType.ColumnIdentifier || reader.TokenType == TokenType.String)
             {
-                columnBuilder.Append(".").Append(reader.TokenValue);
+                columnBuilder.Append('.').Append(reader.TokenValue);
                 reader.Read();
             }
             else

src/Strata.SqlTools.Query/Value.cs

@@ -11,7 +11,7 @@ public class Value
 
     public IEnumerable<CalculationFilterGroup> FilterGroups { get; }
 
-    public Value() : this(string.Empty, string.Empty, new int[0], new string[0], new CalculationFilterGroup[0])
+    public Value() : this(string.Empty, string.Empty, Array.Empty<int>(), Array.Empty<string>(), Array.Empty<CalculationFilterGroup>())
     {
     }
 

src/Strata.SqlTools.Snowflake/Breakdowns/ProcedureBreakdown.cs

@@ -55,7 +55,7 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
 
         sb.Append("CALL ");
         sb.Append(ProcedureName.Clause);
-        sb.Append("(");
+        sb.Append('(');
 
         if (IsUsingParameters)
         {
@@ -68,7 +68,7 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
             sb.Append(string.Join(", ", paramList));
         }
 
-        sb.Append(")");
+        sb.Append(')');
 
         return sb.ToString();
     }

src/Strata.SqlTools.Snowflake/Breakdowns/QueryBreakdown.cs

@@ -141,7 +141,7 @@ public class QueryBreakdown : SqlServerQueryBreakdown
 
         if (parameterName.StartsWith('@'))
         {
-            return ":" + parameterName.Substring(1);
+            return string.Concat(":", parameterName.AsSpan(1));
         }
 
         // Add : prefix
@@ -159,7 +159,7 @@ public class QueryBreakdown : SqlServerQueryBreakdown
             if (paramName.StartsWith(':'))
             {
                 // Add @param version
-                var atParam = "@" + paramName.Substring(1);
+                var atParam = string.Concat("@", paramName.AsSpan(1));
                 if (!Parameters.ContainsKey(atParam))
                 {
                     Parameters[atParam] = Parameters[paramName];
@@ -168,7 +168,7 @@ public class QueryBreakdown : SqlServerQueryBreakdown
             else if (paramName.StartsWith('@'))
             {
                 // Add :param version
-                var colonParam = ":" + paramName.Substring(1);
+                var colonParam = string.Concat(":", paramName.AsSpan(1));
                 if (!Parameters.ContainsKey(colonParam))
                 {
                     Parameters[colonParam] = Parameters[paramName];
@@ -539,7 +539,7 @@ public class QueryBreakdown : SqlServerQueryBreakdown
 
                 if (i > 0)
                 {
-                    sb.Append(",");
+                    sb.Append(',');
                     sb.AppendLine();
                 }
 

src/Strata.SqlTools.Snowflake/Breakdowns/QueryBreakdownCollection.cs

@@ -67,7 +67,7 @@ public class QueryBreakdownCollection : SqlServer.QueryBreakdownCollectionBase<Q
 
                 if (!trimmed.EndsWith(';'))
                 {
-                    sb.Append(";");
+                    sb.Append(';');
                 }
 
                 // Add spacing between statements
@@ -111,7 +111,7 @@ public class QueryBreakdownCollection : SqlServer.QueryBreakdownCollectionBase<Q
                 return true;
             }
 
-            var specificPattern = stageName.Contains("~")
+            var specificPattern = stageName.Contains('~')
                 ? $@"@~/{System.Text.RegularExpressions.Regex.Escape(stageName.TrimStart('@', '~', '/'))}/"
                 : $@"@{System.Text.RegularExpressions.Regex.Escape(stageName.TrimStart('@'))}/";
 
@@ -289,7 +289,7 @@ public class QueryBreakdownCollection : SqlServer.QueryBreakdownCollectionBase<Q
     /// </summary>
     private static bool UsesStageReference(QueryBreakdown query)
     {
-        return query.GetSql().Contains("@") &&
+        return query.GetSql().Contains('@') &&
                (query.GetSql().Contains("FROM @") || query.GetSql().Contains(" @"));
     }
 

src/Strata.SqlTools.SqlBreakdown/Utilities/GuidUtils.cs

@@ -41,7 +41,7 @@ public static class GuidUtils
             return Guid.Empty;
         }
 
-        if (value.Contains("-"))
+        if (value.Contains('-'))
         {
             // This function was called on an already valid guid
             return new Guid(value);
@@ -92,7 +92,7 @@ public static class GuidUtils
         var sb = new System.Text.StringBuilder(newguid);
         while (sb.Length < Guid.Empty.ToString().Length)
         {
-            sb.Append(sb.ToString());
+            sb.Append(sb);
         }
         newguid = sb.ToString();
 
@@ -114,7 +114,7 @@ public static class GuidUtils
         for (int i = 0; i < guidChars.Length; i++)
         {
             char chr = guidChars[i];
-            if (valid.IndexOf(chr) == -1 && !((chr == '-') && (i == 8 || i == 13 || i == 18 || i == 23)))
+            if (!valid.Contains(chr) && !((chr == '-') && (i == 8 || i == 13 || i == 18 || i == 23)))
             {
                 guidChars[i] = valid[Math.Abs(StringUtils.GetHashCode32Bit(chr)) % valid.Length];
             }

src/Strata.SqlTools.SqlBreakdown/Utilities/SqlColumnHelpers.cs

@@ -16,7 +16,7 @@ public static partial class SqlUtils
     public static void AppendAliasColumnWithComma(StringBuilder stringBuilder, string alias, string columnName)
     {
         stringBuilder.Append(alias);
-        stringBuilder.Append(".");
+        stringBuilder.Append('.');
         stringBuilder.Append(columnName);
         stringBuilder.AppendLine(",");
     }
@@ -58,7 +58,7 @@ public static partial class SqlUtils
     {
         stringBuilder.Append("CAST(");
         stringBuilder.Append(alias);
-        stringBuilder.Append(".");
+        stringBuilder.Append('.');
         stringBuilder.Append(columnName);
         stringBuilder.Append(" AS ");
         stringBuilder.Append(dataType);
@@ -94,7 +94,7 @@ public static partial class SqlUtils
         {
             if (i > 0)
             {
-                sb.Append(",");
+                sb.Append(',');
             }
 
             string trimmed = columnNames[i].Trim();

src/Strata.SqlTools.SqlBreakdown/Utilities/SqlGuidHelpers.cs

@@ -42,10 +42,10 @@ public static partial class SqlUtils
 
         foreach (Guid g in guidList)
         {
-            sb.Append("'");
+            sb.Append('\'');
             sb.Append(g.ToString());
-            sb.Append("'");
+            sb.Append('\'');
-            sb.Append(",");
+            sb.Append(',');
         }
 
         return sb.ToString().Trim().TrimEnd(',');

src/Strata.SqlTools.SqlBreakdown/Utilities/SqlUtils.Filters.cs

@@ -27,7 +27,7 @@ public static partial class SqlUtils
         double.TryParse(value, out double dblValue);
 
         // Optimize IN if only one value
-        if (operation == FilterOperation.In && !value.Contains(","))
+        if (operation == FilterOperation.In && !value.Contains(','))
         {
             operation = FilterOperation.Equal;
         }
@@ -144,7 +144,7 @@ public static partial class SqlUtils
                 }
 
                 int lastCloseParen = sb.ToString().LastIndexOf(')');
-                filter.SqlExpression = sb.ToString().Substring(0, lastCloseParen + 1) + ")";
+                filter.SqlExpression = string.Concat(sb.ToString().AsSpan(0, lastCloseParen + 1), ")");
                 break;
 
             case FilterOperation.NotBetween:

src/Strata.SqlTools.SqlServer/Breakdowns/QueryBreakdown.cs

@@ -578,7 +578,7 @@ public class QueryBreakdown : SqlBreakdownBase, IQueryBreakdown
 
                 if (i > 0)
                 {
-                    sb.Append(",");
+                    sb.Append(',');
                     sb.AppendLine();
                 }
 

tests/Strata.SqlTools.PostgreSql.Tests/PostgreSql/QueryBreakdownTests.cs

@@ -513,7 +513,7 @@ public class QueryBreakdownTests
 
         // Assert
         // Find the UserId parameter value
-        var userIdKey = merged.Keys.FirstOrDefault(k => k.Contains("UserId") && !k.Contains("$"));
+        var userIdKey = merged.Keys.FirstOrDefault(k => k.Contains("UserId") && !k.Contains('$'));
         Assert.That(userIdKey, Is.Not.Null);
         Assert.That(merged[userIdKey], Is.EqualTo(123)); // Main query value, not CTE value
     }
@@ -559,9 +559,9 @@ public class QueryBreakdownTests
         var merged = mainQuery.GetMergedParameters();
 
         // Assert
-        var dateKey = merged.Keys.FirstOrDefault(k => k.Contains("CreatedDate") && !k.Contains("$"));
+        var dateKey = merged.Keys.FirstOrDefault(k => k.Contains("CreatedDate") && !k.Contains('$'));
-        var boolKey = merged.Keys.FirstOrDefault(k => k.Contains("IsActive") && !k.Contains("$"));
+        var boolKey = merged.Keys.FirstOrDefault(k => k.Contains("IsActive") && !k.Contains('$'));
-        var doubleKey = merged.Keys.FirstOrDefault(k => k.Contains("Threshold") && !k.Contains("$"));
+        var doubleKey = merged.Keys.FirstOrDefault(k => k.Contains("Threshold") && !k.Contains('$'));
 
         Assert.That(dateKey, Is.Not.Null);
         Assert.That(merged[dateKey], Is.TypeOf<DateTime>());

tests/Strata.SqlTools.Rules.Tests/RuleVisitorTests.cs

@@ -133,7 +133,7 @@ public class TestRuleInput
 
     public string? ImGoingToMakeThisNull { get; set; } = null;
 
-    public TestRuleDetail[] Details { get; set; } = { };
+    public TestRuleDetail[] Details { get; set; } = Array.Empty<TestRuleDetail>();
 }
 
 public class TestRuleDetail

tests/Strata.SqlTools.SqlBreakdown.Tests/ExpressionTests/ExpressionFactoryFilterTests.cs

@@ -31,7 +31,7 @@ public class ExpressionFactoryFilterTests : ExpressionTestsBase
         ).SetName("CalendarFilter_{m}");
 
         yield return new TestCaseData(
-            new Filter(4, FilterType.Timeframe, new object[] { }, Array.Empty<FilterCondition>(), DatePart.Month, false, 1, 3),
+            new Filter(4, FilterType.Timeframe, Array.Empty<object>(), Array.Empty<FilterCondition>(), DatePart.Month, false, 1, 3),
             $"DEPT.DISCHARGE_DATE >= '{startOfCurrentMonth:yyyy-MM-dd}' AND DEPT.DISCHARGE_DATE < '{startOfEndMonth:yyyy-MM-dd}'"
         ).SetName("TimeframeFilter_{m}");
     }

tests/Strata.SqlTools.SqlServer.Tests/SqlServer/RecursiveCTETests.cs

@@ -174,7 +174,7 @@ public class RecursiveCTETests
         var merged = mainQuery.GetMergedParameters();
 
         // Assert
-        var statusKey = merged.Keys.FirstOrDefault(k => k.Contains("Status") && !k.Contains("@") && !k.Contains("$"));
+        var statusKey = merged.Keys.FirstOrDefault(k => k.Contains("Status") && !k.Contains('@') && !k.Contains('$'));
         Assert.That(statusKey, Is.Not.Null);
         Assert.That(merged[statusKey], Is.EqualTo("active"), "Main query parameter should take precedence");
     }