fix: memory leak in periodic sync - clear futures and force GC

- Change futures dict to list (mapping not used)
- Explicitly del futures after as_completed() to release references
- Add gc.collect() after each periodic sync cycle to return arenas to OS
- Bump version to 0.4.1

Author: GeiserX

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "audio-transcode-watcher"
-version = "0.4.0"
+version = "0.4.1"
 description = "Watch a source folder and automatically transcode audio files to multiple formats"
 readme = "README.md"
 license = "GPL-3.0-or-later"

src/audio_transcode_watcher/main.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import gc
 import logging
 import os
 import sys
@@ -83,6 +84,7 @@ def main() -> int:
             if time.time() - last_sync >= sync_interval:
                 logger.info("Periodic sync check…")
                 initial_sync(config)
+                gc.collect()
                 last_sync = time.time()
     except KeyboardInterrupt:
         observer.stop()

src/audio_transcode_watcher/sync.py

@@ -385,10 +385,10 @@ def process_one(src_file: str) -> None:
             logger.error("Error processing %s: %s", src_file, e)
 
     with ThreadPoolExecutor(max_workers=workers) as executor:
-        futures = {executor.submit(process_one, f): f for f in source_files}
+        futures = [executor.submit(process_one, f) for f in source_files]
         for future in as_completed(futures):
-            # Just wait for completion, errors are logged in process_one
             pass
+        del futures
 
     # Remove orphans
     if safety_guard_active(config):