fix(site-event-logging): resolve SiteEventLogging-012..014 — fault dropped-event tasks, escape LIKE wildcards, re-triage startup-purge finding (Won't Fix)

tests/ScadaLink.SiteEventLogging.Tests/EventLogQueryServiceTests.cs

@@ -254,6 +254,50 @@ public class EventLogQueryServiceTests : IDisposable
         Assert.Equal("{\"stack\":\"trace\"}", entry.Details);
     }
 
+    [Fact]
+    public async Task Query_KeywordSearch_TreatsUnderscoreAsLiteral_NotWildcard()
+    {
+        // SiteEventLogging-013: a SQL LIKE '_' matches any single character. A
+        // keyword search for a literal underscore (common in identifiers such as
+        // "store_and_forward") must NOT match strings that merely have any
+        // character in that position.
+        await _eventLogger.LogEventAsync("script", "Info", null, "store_and_forward", "Buffer queued");
+        await _eventLogger.LogEventAsync("script", "Info", null, "storeXandYforward", "Other event");
+
+        var response = _queryService.ExecuteQuery(MakeRequest(keyword: "store_and_forward"));
+
+        Assert.True(response.Success);
+        Assert.Single(response.Entries);
+        Assert.Equal("store_and_forward", response.Entries[0].Source);
+    }
+
+    [Fact]
+    public async Task Query_KeywordSearch_TreatsPercentAsLiteral_NotWildcard()
+    {
+        // SiteEventLogging-013: a SQL LIKE '%' matches any run of characters. A
+        // keyword search containing a literal '%' must match only the literal.
+        await _eventLogger.LogEventAsync("script", "Warning", null, "ScriptActor:Run", "CPU at 90% utilisation");
+        await _eventLogger.LogEventAsync("script", "Warning", null, "ScriptActor:Run", "CPU at 90 then 0 utilisation");
+
+        var response = _queryService.ExecuteQuery(MakeRequest(keyword: "90% utilisation"));
+
+        Assert.True(response.Success);
+        Assert.Single(response.Entries);
+        Assert.Contains("90% utilisation", response.Entries[0].Message);
+    }
+
+    [Fact]
+    public async Task Query_KeywordSearch_StillMatchesPlainSubstring()
+    {
+        // Escaping wildcards must not break ordinary substring search.
+        await SeedEvents();
+
+        var response = _queryService.ExecuteQuery(MakeRequest(keyword: "timeout"));
+
+        Assert.True(response.Success);
+        Assert.Single(response.Entries);
+    }
+
     private void InsertEventAt(DateTimeOffset timestamp, string eventType, string severity, string? instanceId, string source, string message)
     {
         _eventLogger.WithConnection(connection =>