Fix unused limit handling for non-SQL scopes

changelog.d/unreleased/2811.fixed.md

@@ -0,0 +1,17 @@
+---
+category: fixed
+issues:
+  - 2811
+affected:
+  - src/CodeIndex/Database/DbSymbolReader.cs
+  - src/CodeIndex/Database/DbContext.cs
+  - tests/CodeIndex.Tests/DbReaderTests.cs
+---
+
+## English
+
+- **`unused` now avoids long silent scans for non-SQL scopes (#2811)** — `unused --path ... --exclude-tests --json --limit ...` now uses a bounded non-SQL fast path instead of repeatedly running expensive correlated reference scans, so small limits return promptly on large C# scopes.
+
+## 日本語
+
+- **非 SQL スコープで `unused` が長時間無音で走り続けないようになりました (#2811)** — `unused --path ... --exclude-tests --json --limit ...` は高コストな相関参照スキャンを繰り返さず、非 SQL 用の bounded fast path を使うようになったため、大きな C# スコープでも小さな limit がすばやく返ります。

src/CodeIndex/Database/DbContext.cs

@@ -853,7 +853,7 @@ internal static void RegisterConnectionFunctions(SqliteConnection connection)
                 SqlNameResolver.AllowLeafFallbackAtColumn(symbolName, context, containerName, ToNullableInt(columnNumber)) ? 1 : 0);
     }
 
-    private static int CountCSharpIdentifierOccurrences(string? text, string? identifier)
+    internal static int CountCSharpIdentifierOccurrences(string? text, string? identifier)
     {
         if (string.IsNullOrEmpty(text) || string.IsNullOrEmpty(identifier))
             return 0;