diff --git a/src/api.rs b/src/api.rs
index 3b4c7c1..30a8fda 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -1142,8 +1142,8 @@ mod tests {
         let months: HashSet<_> = body.iter().map(|r| r.month.as_str()).collect();
         let species: HashSet<_> = body.iter().map(|r| r.species_code.as_str()).collect();
 
-        assert!(months.len() >= 1);
-        assert!(species.len() >= 1);
+        assert!(!months.is_empty());
+        assert!(!species.is_empty());
 
         for row in &body {
             assert!(!row.species_code.is_empty());
diff --git a/src/main.rs b/src/main.rs
index 2c736c4..3ad87ee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -60,16 +60,15 @@ fn cleanup_stale_parquet_files() {
     match std::fs::read_dir(&tmp_dir) {
         Ok(entries) => {
             for entry in entries.filter_map(|e| e.ok()) {
-                if let Some(name) = entry.file_name().to_str() {
-                    if name.starts_with("hagfish-") && name.ends_with(".parquet") {
-                        if let Ok(metadata) = entry.metadata() {
-                            if let Ok(modified) = metadata.modified() {
-                                let age = std::time::SystemTime::now().duration_since(modified);
-                                if age.map(|d| d.as_secs() > 3600).unwrap_or(false) {
-                                    let _ = std::fs::remove_file(entry.path());
-                                }
-                            }
-                        }
+                if let Some(name) = entry.file_name().to_str()
+                    && name.starts_with("hagfish-")
+                    && name.ends_with(".parquet")
+                    && let Ok(metadata) = entry.metadata()
+                    && let Ok(modified) = metadata.modified()
+                {
+                    let age = std::time::SystemTime::now().duration_since(modified);
+                    if age.map(|d| d.as_secs() > 3600).unwrap_or(false) {
+                        let _ = std::fs::remove_file(entry.path());
                     }
                 }
             }