Created a buffer to store N folders based on timestamp. Each run is only tagged to 1 folder, to handle concurrent users on hF

app.py

@@ -67,6 +67,22 @@ def _kill_running_threads():
         # Clear list regardless of alive status
         _running_threads.clear()
 
+# ──────────── Run directory rotation ─────────────
+RUN_HISTORY_LIMIT = 20  # keep at most this many timestamped run directories per instance
+
+def _prune_old_run_dirs(base_dir: str, limit: int = RUN_HISTORY_LIMIT):
+    """Delete oldest timestamp-named run directories leaving only *limit* of the newest ones."""
+    try:
+        dirs = [d for d in os.listdir(base_dir) if os.path.isdir(os.path.join(base_dir, d))]
+        # Timestamp format YYYYmmdd_HHMMSS ensures lexicographic order == chronological order
+        dirs.sort()
+        if len(dirs) > limit:
+            for obsolete in dirs[:-limit]:
+                shutil.rmtree(os.path.join(base_dir, obsolete), ignore_errors=True)
+    except Exception:
+        # Best-effort; ignore cleanup errors
+        pass
+
 
 # CHANGE ME!
 POLL_INTERVAL = 1.0 # For visualization
@@ -223,14 +239,20 @@ def process_search_tta(
         planner.gifs_path = save_dir
         return planner
 
-    # Directory paths for generated frames
-    gifs_dir_tta = os.path.join(gifs_path, "with_tta")
-    gifs_dir_no  = os.path.join(gifs_path, "no_tta")
+    # ────────────── Per-run output directories ──────────────
+    # Ensure base directory exists
+    os.makedirs(gifs_path, exist_ok=True)
+
+    run_id = time.strftime("%Y%m%d_%H%M%S")  # unique timestamp
+    run_root = os.path.join(gifs_path, run_id)
+    gifs_dir_tta = os.path.join(run_root, "with_tta")
+    gifs_dir_no  = os.path.join(run_root, "no_tta")
+
+    os.makedirs(gifs_dir_tta, exist_ok=True)
+    os.makedirs(gifs_dir_no,  exist_ok=True)
 
-    # Clean previous run's PNG frames before launching new planners
-    for _dir in (gifs_dir_tta, gifs_dir_no):
-        shutil.rmtree(_dir, ignore_errors=True)
-        os.makedirs(_dir, exist_ok=True)
+    # House-keep old runs so we never keep more than RUN_HISTORY_LIMIT
+    _prune_old_run_dirs(gifs_path, RUN_HISTORY_LIMIT)
 
     # Shared dict to record if a thread hit an exception
     error_flags = {"tta": False, "no": False}