fix(relational): bind @status param with casing matching SQL for SQLite (#155)

The GetQueueCount status-filtered path bound the parameter as "@Status"
while all three transport SQL texts use lowercase "@status". Npgsql and
Microsoft.Data.SqlClient match parameter names case-insensitively, so PG
and SQL Server worked, but System.Data.SQLite binds case-sensitively and
threw "Insufficient parameters supplied to the command".

This path was previously dead (the status-filtered admin Count was never
exercised), so the latent mismatch only surfaced once the new #155
regression test enabled status filtering on SQLite.

Align the parameter name to the SQL placeholder casing and harden the
unit test to assert the exact "@status" name (the FakeCommandStringCache
now mirrors the real lowercase SQL).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: blehnen

Source/DotNetWorkQueue.Transport.RelationalDatabase.Tests/Basic/QueryPrepareHandler/FakeCommandStringCache.cs

@@ -16,7 +16,7 @@ protected override void BuildCommands()
             CommandCache[CommandStringTypes.GetDashboardMessages] = "SELECT messages{0} ORDER BY QueuedDateTime DESC";
             CommandCache[CommandStringTypes.GetDashboardMessageCount] = "SELECT COUNT(*) FROM meta";
             CommandCache[CommandStringTypes.GetQueueCountAll] = "SELECT COUNT(*) FROM meta";
-            CommandCache[CommandStringTypes.GetQueueCountStatus] = "SELECT COUNT(*) FROM meta WHERE Status = @Status";
+            CommandCache[CommandStringTypes.GetQueueCountStatus] = "select count(*) from meta where status = @status";
             CommandCache[CommandStringTypes.GetDashboardMessageDetail] = "SELECT detail{0} WHERE QueueID = @QueueId";
             CommandCache[CommandStringTypes.GetDashboardStaleMessages] = "SELECT stale{0}";
             CommandCache[CommandStringTypes.GetDashboardErrorMessages] = "SELECT errors";

Source/DotNetWorkQueue.Transport.RelationalDatabase.Tests/Basic/QueryPrepareHandler/GetQueueCountQueryPrepareHandlerTests.cs

@@ -42,9 +42,14 @@ public void Handle_With_Status_And_StatusEnabled_Binds_Int_Not_Enum()
             handler.Handle(new GetQueueCountQuery("conn", QueueStatusAdmin.Waiting), command, CommandStringTypes.GetQueueCountStatus);
 
             var parameters = (DataParameterCollection)command.Parameters;
-            var status = parameters.First(p => p.ParameterName == "@Status");
+            // Parameter name must match the SQL placeholder casing exactly. System.Data.SQLite binds
+            // parameters case-sensitively, so "@Status" against a "@status" placeholder throws
+            // "Insufficient parameters supplied to the command" (issue #155 follow-up).
+            Assert.AreEqual(1, parameters.Count);
+            var status = parameters.First();
+            Assert.AreEqual("@status", status.ParameterName);
             Assert.AreEqual(DbType.Int32, status.DbType);
-            Assert.IsInstanceOfType(status.Value, typeof(int), "@Status must be bound as an int, not the QueueStatusAdmin enum");
+            Assert.IsInstanceOfType(status.Value, typeof(int), "@status must be bound as an int, not the QueueStatusAdmin enum");
             Assert.AreEqual((int)QueueStatusAdmin.Waiting, status.Value);
         }
 
@@ -56,7 +61,7 @@ public void Handle_With_Status_Uses_StatusFiltered_Command()
 
             handler.Handle(new GetQueueCountQuery("conn", QueueStatusAdmin.Processing), command, CommandStringTypes.GetQueueCountStatus);
 
-            StringAssert.Contains(command.CommandText, "@Status");
+            StringAssert.Contains(command.CommandText, "@status");
         }
 
         [TestMethod]

Source/DotNetWorkQueue.Transport.RelationalDatabase/Basic/QueryPrepareHandler/GetQueueCountQueryPrepareHandler.cs

@@ -48,7 +48,7 @@ public void Handle(GetQueueCountQuery query, IDbCommand dbCommand, CommandString
             {
                 dbCommand.CommandText = _commandCache.GetCommand(CommandStringTypes.GetQueueCountStatus);
                 var status = dbCommand.CreateParameter();
-                status.ParameterName = "@Status";
+                status.ParameterName = "@status";
                 status.DbType = DbType.Int32;
                 status.Value = (int)query.Status.Value;
                 dbCommand.Parameters.Add(status);