diff --git a/.gitignore b/.gitignore
index badc133..d84ca9d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,7 +8,7 @@
 /bin/
 
 # runtime data
-data/events.jsonl
+data/
 config.autosave.yaml
 
 # local prompts
diff --git a/tools/build-gpudemod-kernel.ps1 b/tools/build-gpudemod-kernel.ps1
index d021574..f09276f 100644
--- a/tools/build-gpudemod-kernel.ps1
+++ b/tools/build-gpudemod-kernel.ps1
@@ -16,6 +16,8 @@ if (!(Test-Path $nvcc)) {
 New-Item -ItemType Directory -Force -Path $OutDir | Out-Null
 $outObj = Join-Path $OutDir 'kernels.obj'
 $outLib = Join-Path $OutDir 'gpudemod_kernels.lib'
+if (Test-Path $outObj) { Remove-Item $outObj -Force }
+if (Test-Path $outLib) { Remove-Item $outLib -Force }
 
 Write-Host "Using nvcc: $nvcc"
 Write-Host "Building $Source -> $outObj"