Increase regex timeout headroom for SQL refs

changelog.d/unreleased/2949.fixed.md

@@ -0,0 +1,16 @@
+---
+category: fixed
+issues:
+  - 2949
+affected:
+  - src/CodeIndex/Indexer/BoundedRegex.cs
+  - tests/CodeIndex.Tests/BoundedRegexTests.cs
+---
+
+## English
+
+- **SQL reference extraction is less likely to drop matches under full-suite CPU contention (#2949)** - bounded regex matching now keeps a larger but still finite default timeout, reducing intermittent missed SQL references during heavily loaded test and indexing runs.
+
+## 日本語
+
+- **full-suite の CPU 競合下で SQL reference 抽出が match を落としにくくなりました (#2949)** - bounded regex matching の既定 timeout を、有限のまま余裕を持たせた値に変更し、高負荷なテスト実行や index 実行中に SQL reference が断続的に欠ける問題を減らしました。

src/CodeIndex/Indexer/BoundedRegex.cs

@@ -6,7 +6,8 @@ namespace CodeIndex.Indexer;
 
 internal sealed class BoundedRegex : BclRegex
 {
-    internal static readonly TimeSpan DefaultMatchTimeout = TimeSpan.FromMilliseconds(250);
+    // Keep regex matches bounded, but leave enough scheduler headroom for full-suite CI contention.
+    internal static readonly TimeSpan DefaultMatchTimeout = TimeSpan.FromSeconds(1);
 
     public BoundedRegex(string pattern)
         : base(pattern, RegexOptions.None, DefaultMatchTimeout)

tests/CodeIndex.Tests/BoundedRegexTests.cs

@@ -0,0 +1,15 @@
+using CodeIndex.Indexer;
+
+namespace CodeIndex.Tests;
+
+public sealed class BoundedRegexTests
+{
+    [Fact]
+    public void DefaultMatchTimeout_KeepsBoundedMatchesFromTimingOutUnderNormalSchedulerContention()
+    {
+        Assert.InRange(
+            BoundedRegex.DefaultMatchTimeout,
+            TimeSpan.FromSeconds(1),
+            TimeSpan.FromSeconds(5));
+    }
+}