diff --git a/src-tauri/src/generations/mod.rs b/src-tauri/src/generations/mod.rs
index 031b022..7de413c 100644
--- a/src-tauri/src/generations/mod.rs
+++ b/src-tauri/src/generations/mod.rs
@@ -159,15 +159,17 @@ impl GenerationStore {
 mod tests {
     use super::*;
 
-    fn tmp() -> std::path::PathBuf {
-        let dir = std::env::temp_dir().join(format!("dm-pal-test-{}", std::process::id()));
+    // ponytail: unique dir per test — both tests previously shared one
+    // pid-keyed dir and raced on the same SQLite file (flaky "disk I/O error").
+    fn tmp(name: &str) -> std::path::PathBuf {
+        let dir = std::env::temp_dir().join(format!("dm-pal-test-{name}-{}", std::process::id()));
         let _ = std::fs::remove_dir_all(&dir);
         dir
     }
 
     #[test]
     fn round_trip() {
-        let dir = tmp();
+        let dir = tmp("round-trip");
         let store = GenerationStore::open(&dir).unwrap();
         let id = store
             .add("npc", "Thorin Stonefist", r#"{"name":"Thorin"}"#, Some("Dwarf Fighter"))
@@ -196,7 +198,7 @@ mod tests {
 
     #[test]
     fn clear_all() {
-        let dir = tmp();
+        let dir = tmp("clear-all");
         let store = GenerationStore::open(&dir).unwrap();
         store.add("a", "x", "{}", None).unwrap();
         store.add("b", "y", "{}", None).unwrap();