Add opt-in setting to replace lower quality files on import

New toggle in Settings > Library: "Replace lower quality files on
import". When enabled, if a track already exists in the library at
a lower quality tier (e.g. MP3) and a higher quality version (e.g.
FLAC) is imported from staging, the existing file is replaced.
Comparison uses the existing QUALITY_TIERS system (lossless > opus/
ogg > m4a > mp3). When disabled (default), existing behavior is
unchanged — existing tracks are always kept. Also applies to regular
downloads that land on an existing file.

config/settings.py

@@ -461,7 +461,8 @@ class ConfigManager:
                 "poll_interval": 30
             },
             "import": {
-                "staging_path": "./Staging"
+                "staging_path": "./Staging",
+                "replace_lower_quality": False
             },
             "m3u_export": {
                 "enabled": False

web_server.py

@@ -20076,15 +20076,37 @@ def _post_process_matched_download(context_key, context, file_path):
                 has_metadata = existing_file is not None and len(existing_file.tags or {}) > 2  # More than basic tags
 
                 if has_metadata and not is_enhance_download:
-                    print(f"⚠️ [Protection] Existing file already has metadata enhancement - skipping overwrite: {os.path.basename(final_path)}")
-                    print(f"🗑️ [Protection] Removing redundant download file: {os.path.basename(file_path)}")
-                    try:
-                        os.remove(file_path)  # Remove the redundant file
-                    except FileNotFoundError:
-                        print(f"⚠️ [Protection] Could not remove redundant file (already gone): {file_path}")
-                    except Exception as e:
-                        print(f"⚠️ [Protection] Error removing redundant file: {e}")
-                    return  # Don't overwrite the good file
+                    # Check if incoming file is higher quality and setting is enabled
+                    _replace_lower = config_manager.get('import.replace_lower_quality', False)
+                    if _replace_lower:
+                        _existing_tier = _get_quality_tier_from_extension(final_path)
+                        _incoming_tier = _get_quality_tier_from_extension(file_path)
+                        if _incoming_tier[1] < _existing_tier[1]:
+                            # Incoming is higher quality (lower tier number) — replace
+                            print(f"🔄 [Quality Replace] Replacing {_existing_tier[0]} with {_incoming_tier[0]}: {os.path.basename(final_path)}")
+                            try:
+                                os.remove(final_path)
+                            except Exception as e:
+                                print(f"⚠️ [Quality Replace] Could not remove existing file: {e}")
+                        else:
+                            print(f"⚠️ [Protection] Existing file is same or better quality ({_existing_tier[0]} vs {_incoming_tier[0]}) - skipping: {os.path.basename(final_path)}")
+                            try:
+                                os.remove(file_path)
+                            except FileNotFoundError:
+                                pass
+                            except Exception as e:
+                                print(f"⚠️ [Protection] Error removing redundant file: {e}")
+                            return
+                    else:
+                        print(f"⚠️ [Protection] Existing file already has metadata enhancement - skipping overwrite: {os.path.basename(final_path)}")
+                        print(f"🗑️ [Protection] Removing redundant download file: {os.path.basename(file_path)}")
+                        try:
+                            os.remove(file_path)
+                        except FileNotFoundError:
+                            print(f"⚠️ [Protection] Could not remove redundant file (already gone): {file_path}")
+                        except Exception as e:
+                            print(f"⚠️ [Protection] Error removing redundant file: {e}")
+                        return  # Don't overwrite the good file
                 elif is_enhance_download:
                     # ENHANCE BYPASS: Allow overwrite — backup original, then remove to allow move
                     print(f"🔄 [Enhance] Quality enhance mode — replacing existing file: {os.path.basename(final_path)}")

webui/index.html

@@ -5710,6 +5710,24 @@
                             </div>
 
 
+                            <!-- Import Quality Settings -->
+                            <div class="settings-group" data-stg="library">
+                                <h3>📥 Import Settings</h3>
+
+                                <div class="form-group">
+                                    <label class="checkbox-label">
+                                        <input type="checkbox" id="import-replace-lower-quality">
+                                        Replace lower quality files on import
+                                    </label>
+                                </div>
+                                <div class="help-text">
+                                    When importing from Staging, if a track already exists in your library at a lower quality
+                                    (e.g. MP3), it will be replaced with the higher quality version (e.g. FLAC).
+                                    If disabled, existing tracks are always kept and the import file is skipped.
+                                </div>
+                            </div>
+
+
                             <!-- M3U Export Settings -->
                             <div class="settings-group" data-stg="library">
                                 <h3>📋 M3U Playlist Export</h3>

webui/static/script.js

@@ -5972,6 +5972,9 @@ async function loadSettingsData() {
         // Populate Content Filter settings
         document.getElementById('allow-explicit').checked = settings.content_filter?.allow_explicit !== false;
 
+        // Populate Import settings
+        document.getElementById('import-replace-lower-quality').checked = settings.import?.replace_lower_quality === true;
+
         // Populate M3U Export settings
         document.getElementById('m3u-export-enabled').checked = settings.m3u_export?.enabled === true;
 
@@ -7076,6 +7079,9 @@ async function saveSettings(quiet = false) {
         content_filter: {
             allow_explicit: document.getElementById('allow-explicit').checked
         },
+        import: {
+            replace_lower_quality: document.getElementById('import-replace-lower-quality').checked
+        },
         lossy_copy: {
             enabled: document.getElementById('lossy-copy-enabled').checked,
             codec: document.getElementById('lossy-copy-codec').value,