Add Recently Added, bulk rename, time remaining, library stats, backup export

Five more usability features on top of the search/thumbnails batch:

- Recently Added: dashboard card of courses by folder mtime, separate from
  Recently Viewed (watched vs. just showed up on disk).
- Bulk find/replace rename across every course/folder name at once, with a
  mandatory preview step before anything touches disk. Refactored the
  single-item rename route to share the same validate/apply logic.
- Estimated time remaining on the loaded course's stats card, computed only
  from lessons that have actually reported a duration.
- Library-wide stats overview: total courses, lessons tracked, time
  watched, daily streak - read from each course's small progress file
  rather than re-scanning course contents.
- One-click backup/export zip of settings, hidden-paths, recently-viewed,
  and every course's progress/notes.

Also fixes a real performance bug found along the way: search was routing
through list_library_directory, which computes a full recursive file count
and thumbnail lookup for every course at every level regardless of match -
turning a search into an O(every file in the library) scan. Gave search its
own lightweight directory-only walk (iter_all_courses), now shared by
Recently Added and the stats overview too, so the expensive per-course work
only runs for courses that actually match.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

OfflineU-project-summary.md

@@ -163,6 +163,48 @@ Asked for after brainstorming what could make the app nicer to use — see
    avoid re-validating/re-scanning an untrusted path). Button lives in the
    course stats card, behind a confirm prompt.
 
+## Search perf fix + five more features (this session)
+
+Also caught: search on the real deployed library was taking 3+ seconds
+(scanning ~6000+ files across the real course tree). Root cause:
+`search_library_courses` walked via `list_library_directory`, which computes
+a full recursive file count (`rglob`) and thumbnail lookup for *every*
+course at *every* level, regardless of whether it matched. Rewrote it with
+its own directory-only walk (`iter_all_courses` - now shared by search,
+Recently Added, and library stats below) so the expensive per-course work
+only runs for courses that actually match. Verified with a synthetic
+6000-file library: effectively instant for narrow queries, same cost as
+before only in the pathological "everything matches" case (unavoidable -
+you need real data for every result you return).
+
+1. **Recently Added** — dashboard card showing courses by folder mtime
+   (`get_recently_added_courses`), separate from Recently Viewed (which
+   tracks what's been *watched*, not what showed up on disk).
+2. **Bulk find/replace rename** — `Settings → Manage Library → Bulk Rename`.
+   Preview (`GET /api/bulk-rename/preview`) before apply
+   (`POST /api/bulk-rename/apply`) is mandatory; apply takes the *exact*
+   list the client saw in preview (not a re-derived pattern match), and
+   continues past individual failures (e.g. a name collision) rather than
+   aborting the whole batch. Scans every directory in the library, course
+   and category/group folders alike (`_iter_all_directories`) - by user's
+   choice, since the naming problem isn't limited to course-level folders.
+   The single-item rename route (`/api/rename-path`) was refactored to
+   share the same validation/apply logic (`validate_new_name`,
+   `perform_rename`) - confirmed byte-for-byte identical error responses
+   after the refactor.
+3. **Estimated time remaining** — added to `_calculate_completion_stats`;
+   only ever computed over lessons that have actually reported a duration
+   (i.e. been played at least once) - no data, no estimate shown, rather
+   than a misleading "0 remaining."
+4. **Library stats overview** — total courses, lessons tracked, time
+   watched, daily streak. Reads each course's small progress JSON directly
+   rather than re-scanning course contents, so it stays cheap regardless of
+   how many files live inside each course.
+5. **Backup/export** — `GET /api/backup`, a `Settings → Backup & Export`
+   button. Zips settings/hidden-paths/recent-views plus every course's
+   progress+notes file (stdlib `zipfile`, no new dependency) - not the
+   course files themselves.
+
 ## Known limitations still open
 - App is unauthenticated by design (matches upstream) — settings and hidden-path
   curation apply app-wide, not per-browser/per-user.

offlineu_core.py

@@ -10,10 +10,12 @@ import mimetypes
 import re
 import sys
 import argparse
+import io
+import zipfile
 from pathlib import Path
-from datetime import datetime
+from datetime import datetime, timedelta
 from dataclasses import dataclass, asdict
-from typing import List, Dict, Optional, Any, Tuple
+from typing import List, Dict, Optional, Any, Tuple, Iterator
 from flask import Flask, render_template, request, jsonify, send_file, redirect, url_for
 
 app = Flask(__name__)
@@ -453,15 +455,26 @@ class DynamicCourseParser:
         """Calculate completion statistics for a directory node"""
         total_lessons = 0
         completed_lessons = 0
+        # Only lessons that have actually been played report a duration, so
+        # "remaining time" is only ever an estimate over what's known so far
+        # - there's no way to know the length of a lesson nobody's opened yet.
+        total_duration_seconds = 0
+        watched_seconds = 0
 
         def count_lessons_recursive(n: DirectoryNode):
-            nonlocal total_lessons, completed_lessons
+            nonlocal total_lessons, completed_lessons, total_duration_seconds, watched_seconds
 
             # Count lessons in this node
             for lesson in n.lessons:
                 total_lessons += 1
                 if lesson.completed:
                     completed_lessons += 1
+                if lesson.duration_seconds:
+                    total_duration_seconds += lesson.duration_seconds
+                    watched_seconds += (
+                        lesson.duration_seconds if lesson.completed
+                        else min(lesson.progress_seconds, lesson.duration_seconds)
+                    )
 
             # Recursively count in children
             for child in n.children.values():
@@ -474,7 +487,9 @@ class DynamicCourseParser:
         return {
             'total_lessons': total_lessons,
             'completed_lessons': completed_lessons,
-            'completion_percentage': round(completion_percentage, 1)
+            'completion_percentage': round(completion_percentage, 1),
+            'total_duration_seconds': total_duration_seconds,
+            'remaining_seconds': max(0, total_duration_seconds - watched_seconds)
         }
 
 
@@ -732,29 +747,160 @@ def get_library_root() -> str:
     return LIBRARY_PATH
 
 
+def iter_all_courses(dir_path: str) -> Iterator[Path]:
+    """
+    Recursively yield every course directory under dir_path, respecting
+    hidden paths exactly like normal browsing - without touching file
+    contents/counts. This is the cheap directory-only walk (iterdir +
+    _looks_like_course) that search, "Recently Added," and library stats
+    all need; the expensive per-course work (media_count via rglob,
+    thumbnail lookup, progress-file reads) is left to each caller to do
+    only for the courses it actually ends up using.
+    """
+    hidden_set = set(get_hidden_paths())
+
+    def walk(directory: Path) -> Iterator[Path]:
+        try:
+            entries = sorted(
+                (p for p in directory.iterdir() if p.is_dir() and not p.name.startswith('.')),
+                key=lambda p: p.name.lower()
+            )
+        except (PermissionError, OSError):
+            return
+
+        for entry in entries:
+            if os.path.abspath(str(entry)) in hidden_set:
+                continue
+            if _looks_like_course(entry):
+                yield entry
+            else:
+                yield from walk(entry)
+
+    yield from walk(Path(dir_path))
+
+
+def _course_summary(course_dir: Path) -> Dict[str, Any]:
+    """Build the {type, name, path, media_files, hidden, has_thumbnail} shape
+    shared by the Library browser, search results, and Recently Added."""
+    media_count = len([
+        f for f in course_dir.rglob('*')
+        if f.is_file() and f.suffix.lower() in VIDEO_EXTENSIONS | AUDIO_EXTENSIONS
+    ])
+    return {
+        'type': 'course',
+        'name': course_dir.name,
+        'path': str(course_dir),
+        'media_files': media_count,
+        'hidden': False,
+        'has_thumbnail': find_course_thumbnail(str(course_dir)) is not None
+    }
+
+
 def search_library_courses(dir_path: str, query: str) -> List[Dict[str, Any]]:
     """
-    Recursively search the library for courses whose name contains `query`
-    (case-insensitive). Walks via list_library_directory, so it reuses the
-    exact same course/directory detection and hidden-path filtering as
-    normal browsing - a hidden course or folder never shows up in results.
+    Search the library for courses whose name contains `query`
+    (case-insensitive). The expensive per-course lookups (media_count,
+    thumbnail) only run for courses whose name actually matches - see
+    iter_all_courses.
     """
     query_lower = query.lower()
-    results: List[Dict[str, Any]] = []
+    return [
+        _course_summary(course)
+        for course in iter_all_courses(dir_path)
+        if query_lower in course.name.lower()
+    ]
 
-    def walk(path: str):
-        level = list_library_directory(path)
-        for item in level['items']:
-            if item['type'] == 'course':
-                if query_lower in item['name'].lower():
-                    results.append(item)
-            else:
-                walk(item['path'])
 
-    walk(dir_path)
+def _humanize_days_ago(dt: datetime) -> str:
+    """'Today' / 'Yesterday' / 'N days ago' / a plain date once it's old enough to matter less."""
+    days = (datetime.now().date() - dt.date()).days
+    if days <= 0:
+        return 'Today'
+    if days == 1:
+        return 'Yesterday'
+    if days < 14:
+        return f'{days} days ago'
+    return dt.strftime('%b %d')
+
+
+def get_recently_added_courses(limit: int = 5) -> List[Dict[str, Any]]:
+    """
+    Courses whose folder was most recently created/modified on disk, for
+    the dashboard's "Recently Added" card - separate from Recently Viewed
+    (which tracks what you've *watched*, not what showed up in the library).
+    """
+    library_root = get_library_root()
+    dated = []
+    for course_dir in iter_all_courses(library_root):
+        try:
+            mtime = course_dir.stat().st_mtime
+        except OSError:
+            continue
+        dated.append((mtime, course_dir))
+    dated.sort(key=lambda pair: pair[0], reverse=True)
+
+    results = []
+    for mtime, course_dir in dated[:limit]:
+        item = _course_summary(course_dir)
+        item['added_display'] = _humanize_days_ago(datetime.fromtimestamp(mtime))
+        results.append(item)
     return results
 
 
+def get_library_stats() -> Dict[str, Any]:
+    """
+    Library-wide overview for the dashboard: total courses, lessons with
+    any progress record, completed lessons, total time watched, and the
+    current daily streak. Reads each course's small progress JSON file
+    directly rather than re-scanning course directory contents, so this
+    stays cheap regardless of how many files are inside each course.
+    """
+    total_courses = 0
+    lessons_tracked = 0
+    completed_lessons = 0
+    watched_seconds = 0
+    active_dates = set()
+
+    for course_dir in iter_all_courses(get_library_root()):
+        total_courses += 1
+        try:
+            with open(course_dir / '.offlineu_progress.json', 'r') as f:
+                progress = json.load(f)
+        except (FileNotFoundError, json.JSONDecodeError, OSError):
+            continue
+
+        for key, entry in progress.items():
+            if key == 'last_accessed_path' or not isinstance(entry, dict):
+                continue
+            lessons_tracked += 1
+            if entry.get('completed'):
+                completed_lessons += 1
+                watched_seconds += entry.get('duration_seconds') or 0
+            else:
+                watched_seconds += entry.get('progress_seconds') or 0
+
+            last_accessed = entry.get('last_accessed')
+            if last_accessed:
+                try:
+                    active_dates.add(datetime.fromisoformat(last_accessed).date())
+                except ValueError:
+                    pass
+
+    streak_days = 0
+    day = datetime.now().date()
+    while day in active_dates:
+        streak_days += 1
+        day -= timedelta(days=1)
+
+    return {
+        'total_courses': total_courses,
+        'lessons_tracked': lessons_tracked,
+        'completed_lessons': completed_lessons,
+        'watched_display': format_duration(watched_seconds),
+        'streak_days': streak_days
+    }
+
+
 RECENT_VIEWS_FILE = os.path.join(DATA_DIR, 'recent_views.json')
 MAX_RECENT_VIEWS = 20
 
@@ -992,6 +1138,13 @@ def _split_continue_watching(all_views: List[Dict[str, Any]]) -> Tuple[List[Dict
     return continue_watching, recent_views
 
 
+def format_duration(seconds: int) -> str:
+    """Render a duration in seconds as e.g. '3h 24m' or '45m' (under an hour)."""
+    total_minutes = max(0, int(seconds)) // 60
+    hours, minutes = divmod(total_minutes, 60)
+    return f"{hours}h {minutes}m" if hours else f"{minutes}m"
+
+
 @app.route('/')
 def index():
     """Main dashboard"""
@@ -1005,11 +1158,15 @@ def index():
                                course=None,
                                stats={'total_lessons': 0, 'completed_lessons': 0, 'completion_percentage': 0},
                                continue_watching=continue_watching,
-                               recent_views=recent_views)
+                               recent_views=recent_views,
+                               recently_added=get_recently_added_courses(),
+                               library_stats=get_library_stats())
 
     # Apply progress data to tree
     ProgressTracker.apply_progress_to_tree(current_course)
     stats = ProgressTracker.get_completion_stats(current_course)
+    if stats.get('total_duration_seconds'):
+        stats['remaining_display'] = format_duration(stats['remaining_seconds'])
 
     return render_template('course_dashboard.html',
                            course=current_course,
@@ -1212,41 +1369,48 @@ def set_hidden_path_api():
     return jsonify({'success': True, 'hidden_paths': updated})
 
 
-@app.route('/api/rename-path', methods=['POST'])
-def rename_path_api():
-    """Rename a course/folder directory in the library, in place on disk."""
+def validate_new_name(new_name: str) -> Optional[str]:
+    """Validate a proposed directory name; returns an error message, or None if valid."""
+    if not new_name:
+        return 'New name cannot be empty'
+    if '/' in new_name or '\\' in new_name or '\x00' in new_name or new_name in ('.', '..'):
+        return 'New name cannot contain path separators'
+    if new_name.startswith('.'):
+        return 'New name cannot start with a dot'
+    return None
+
+
+def perform_rename(old_path: str, new_name: str) -> Dict[str, Any]:
+    """
+    Validate and apply a single directory rename within the library root:
+    rebases any hidden-path/recent-view references that pointed inside it,
+    and resets the active course if it (or an ancestor) was the thing
+    renamed. Shared by the single-item and bulk rename routes, always
+    returning a dict with a 'status' key for the caller to respond with.
+    """
     global current_course
 
-    data = request.json or {}
-    path = data.get('path', '')
-    new_name = (data.get('new_name') or '').strip()
-
-    if not path:
-        return jsonify({'error': 'path is required'}), 400
-    if not new_name:
-        return jsonify({'error': 'New name cannot be empty'}), 400
-    if '/' in new_name or '\\' in new_name or '\x00' in new_name or new_name in ('.', '..'):
-        return jsonify({'error': 'New name cannot contain path separators'}), 400
-    if new_name.startswith('.'):
-        return jsonify({'error': 'New name cannot start with a dot'}), 400
+    error = validate_new_name(new_name)
+    if error:
+        return {'success': False, 'error': error, 'status': 400}
 
     library_root = os.path.abspath(get_library_root())
-    old_abs = os.path.abspath(path)
+    old_abs = os.path.abspath(old_path)
     if not (old_abs == library_root or old_abs.startswith(library_root + os.sep)):
-        return jsonify({'error': 'Path outside library root'}), 403
+        return {'success': False, 'error': 'Path outside library root', 'status': 403}
     if old_abs == library_root:
-        return jsonify({'error': 'Cannot rename the library root itself'}), 400
+        return {'success': False, 'error': 'Cannot rename the library root itself', 'status': 400}
     if not os.path.isdir(old_abs):
-        return jsonify({'error': 'Directory not found'}), 404
+        return {'success': False, 'error': 'Directory not found', 'status': 404}
 
     new_abs = os.path.join(os.path.dirname(old_abs), new_name)
     if os.path.exists(new_abs):
-        return jsonify({'error': f'"{new_name}" already exists here'}), 409
+        return {'success': False, 'error': f'"{new_name}" already exists here', 'status': 409}
 
     try:
         os.rename(old_abs, new_abs)
     except OSError as e:
-        return jsonify({'error': f'Rename failed: {e}'}), 500
+        return {'success': False, 'error': f'Rename failed: {e}', 'status': 500}
 
     rebase_library_path(old_abs, new_abs)
 
@@ -1257,7 +1421,107 @@ def rename_path_api():
             current_course = None
             active_course_reset = True
 
-    return jsonify({'success': True, 'new_path': new_abs, 'active_course_reset': active_course_reset})
+    return {
+        'success': True,
+        'new_path': new_abs,
+        'active_course_reset': active_course_reset,
+        'status': 200
+    }
+
+
+@app.route('/api/rename-path', methods=['POST'])
+def rename_path_api():
+    """Rename a course/folder directory in the library, in place on disk."""
+    data = request.json or {}
+    path = data.get('path', '')
+    new_name = (data.get('new_name') or '').strip()
+
+    if not path:
+        return jsonify({'error': 'path is required'}), 400
+
+    result = perform_rename(path, new_name)
+    status = result.pop('status')
+    return jsonify(result), status
+
+
+def _iter_all_directories(directory: Path, hidden_set: set) -> Iterator[Path]:
+    """
+    Yield every directory in the library tree - both course folders and the
+    category/group folders above them - skipping hidden ones and not
+    descending into a course's own internal sections (Section 1, etc. -
+    those aren't independently manageable library items anywhere else in
+    the app either, so bulk rename shouldn't touch them).
+    """
+    try:
+        entries = sorted(
+            (p for p in directory.iterdir() if p.is_dir() and not p.name.startswith('.')),
+            key=lambda p: p.name.lower()
+        )
+    except (PermissionError, OSError):
+        return
+
+    for entry in entries:
+        if os.path.abspath(str(entry)) in hidden_set:
+            continue
+        yield entry
+        if not _looks_like_course(entry):
+            yield from _iter_all_directories(entry, hidden_set)
+
+
+def find_bulk_rename_matches(library_root: str, pattern: str, replacement: str) -> List[Dict[str, str]]:
+    """Every directory (course or folder) in the library whose name contains `pattern`."""
+    hidden_set = set(get_hidden_paths())
+    return [
+        {
+            'path': str(directory),
+            'old_name': directory.name,
+            'new_name': directory.name.replace(pattern, replacement)
+        }
+        for directory in _iter_all_directories(Path(library_root), hidden_set)
+        if pattern in directory.name
+    ]
+
+
+@app.route('/api/bulk-rename/preview')
+def bulk_rename_preview_api():
+    """Preview a find/replace rename across the whole library, without touching disk."""
+    pattern = request.args.get('pattern', '')
+    replacement = request.args.get('replacement', '')
+    if not pattern:
+        return jsonify({'error': 'pattern is required'}), 400
+
+    library_root = os.path.abspath(get_library_root())
+    matches = find_bulk_rename_matches(library_root, pattern, replacement)
+    return jsonify({'matches': matches})
+
+
+@app.route('/api/bulk-rename/apply', methods=['POST'])
+def bulk_rename_apply_api():
+    """
+    Apply a bulk rename. Takes the *exact* {path, new_name} list the client
+    got back from /api/bulk-rename/preview, rather than re-deriving matches
+    from the pattern again - what gets renamed is provably what the user
+    saw and approved, and can't drift if the library changed in between.
+    Continues past individual failures (e.g. a collision) instead of
+    aborting the whole batch, reporting a per-item result.
+    """
+    data = request.json or {}
+    items = data.get('items') or []
+    if not isinstance(items, list) or not items:
+        return jsonify({'error': 'items is required'}), 400
+
+    results = []
+    for item in items:
+        path = item.get('path', '')
+        new_name = item.get('new_name', '')
+        outcome = perform_rename(path, new_name)
+        outcome.pop('status', None)
+        outcome['path'] = path
+        outcome['old_name'] = item.get('old_name', '')
+        outcome['new_name'] = new_name
+        results.append(outcome)
+
+    return jsonify({'results': results})
 
 
 @app.route('/settings')
@@ -1321,6 +1585,36 @@ def reset_settings_api():
     })
 
 
+@app.route('/api/backup')
+def download_backup():
+    """
+    Bundle everything that isn't recoverable from the course files
+    themselves - settings, hidden-path curation, recently-viewed history,
+    and every course's progress/notes file - into a single downloadable
+    zip. Cheap insurance before a NAS migration or a docker volume mistake.
+    """
+    buffer = io.BytesIO()
+    with zipfile.ZipFile(buffer, 'w', zipfile.ZIP_DEFLATED) as zf:
+        for name, path in (
+            ('settings.json', SETTINGS_FILE),
+            ('hidden_paths.json', HIDDEN_PATHS_FILE),
+            ('recent_views.json', RECENT_VIEWS_FILE),
+        ):
+            if os.path.exists(path):
+                zf.write(path, name)
+
+        library_root = get_library_root()
+        for course_dir in iter_all_courses(library_root):
+            progress_file = course_dir / '.offlineu_progress.json'
+            if progress_file.exists():
+                relative = os.path.relpath(str(course_dir), library_root)
+                zf.write(progress_file, os.path.join('progress', relative, '.offlineu_progress.json'))
+
+    buffer.seek(0)
+    filename = f"offlineu-backup-{datetime.now().strftime('%Y-%m-%d')}.zip"
+    return send_file(buffer, mimetype='application/zip', as_attachment=True, download_name=filename)
+
+
 @app.route('/load_course', methods=['POST'])
 def load_course():
     """Load course from selected directory"""

templates/course_dashboard.html

@@ -251,6 +251,32 @@
             border-radius: 10px;
         }
 
+        .stats-grid {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
+            gap: 12px;
+            margin-top: 12px;
+        }
+
+        .stats-tile {
+            background: var(--bg-tertiary);
+            border-radius: var(--radius);
+            padding: 14px 10px;
+            text-align: center;
+        }
+
+        .stats-tile-value {
+            font-size: 1.5em;
+            font-weight: 700;
+            color: var(--accent);
+        }
+
+        .stats-tile-label {
+            font-size: 0.8em;
+            color: var(--text-muted);
+            margin-top: 2px;
+        }
+
         .library-breadcrumb {
             color: var(--text-muted);
             font-size: 13px;
@@ -635,8 +661,15 @@
                     <div>
                         <strong>{{ stats.completed_lessons }}/{{ stats.total_lessons }}</strong> lessons completed
                     </div>
-                    <div style="color: #007acc; font-size: 1.2em;">
-                        {{ "%.1f"|format(stats.completion_percentage) }}%
+                    <div style="text-align: right;">
+                        <div style="color: #007acc; font-size: 1.2em;">
+                            {{ "%.1f"|format(stats.completion_percentage) }}%
+                        </div>
+                        {% if stats.remaining_display %}
+                        <div style="color: var(--text-muted); font-size: 0.85em;">
+                            ~{{ stats.remaining_display }} remaining
+                        </div>
+                        {% endif %}
                     </div>
                 </div>
                 <div class="progress-bar">
@@ -746,6 +779,58 @@
         </div>
         {% endmacro %}
 
+        {% macro render_course_row(item, meta_text) %}
+        <div class="lesson-item" onclick="loadCoursePath('{{ item.path|replace("'", "\\'") }}')">
+            <div class="lesson-title">
+                {% if item.has_thumbnail %}
+                <img class="lesson-thumb" src="/library/thumbnail?path={{ item.path | urlencode }}" alt=""
+                     onerror="this.replaceWith(courseFallbackIcon('🎓'))">
+                {% else %}
+                <span class="lesson-icon">🎓</span>
+                {% endif %}
+                <span class="lesson-name">{{ item.name }}</span>
+            </div>
+            <span class="lesson-meta">{{ meta_text }}</span>
+        </div>
+        {% endmacro %}
+
+        {% if library_stats and library_stats.total_courses %}
+        <div class="container">
+            <div class="card">
+                <h2>📊 Library Stats</h2>
+                <div class="stats-grid">
+                    <div class="stats-tile">
+                        <div class="stats-tile-value">{{ library_stats.total_courses }}</div>
+                        <div class="stats-tile-label">Courses</div>
+                    </div>
+                    <div class="stats-tile">
+                        <div class="stats-tile-value">{{ library_stats.completed_lessons }}/{{ library_stats.lessons_tracked }}</div>
+                        <div class="stats-tile-label">Lessons completed</div>
+                    </div>
+                    <div class="stats-tile">
+                        <div class="stats-tile-value">{{ library_stats.watched_display }}</div>
+                        <div class="stats-tile-label">Watched</div>
+                    </div>
+                    <div class="stats-tile">
+                        <div class="stats-tile-value">{{ library_stats.streak_days }}</div>
+                        <div class="stats-tile-label">Day streak</div>
+                    </div>
+                </div>
+            </div>
+        </div>
+        {% endif %}
+        {% if recently_added %}
+        <div class="container">
+            <div class="card">
+                <h2>🆕 Recently Added</h2>
+                <div style="margin-top: 12px;">
+                    {% for item in recently_added %}
+                    {{ render_course_row(item, item.added_display) }}
+                    {% endfor %}
+                </div>
+            </div>
+        </div>
+        {% endif %}
         {% if continue_watching %}
         <div class="container">
             <div class="card">

templates/settings.html

@@ -281,6 +281,30 @@
             font-size: 0.8em;
             color: #ff6b6b;
         }
+        .bulk-rename-row {
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            gap: 10px;
+            padding: 8px 10px;
+            border-radius: var(--radius);
+            background: var(--bg-tertiary);
+            margin-bottom: 5px;
+        }
+        .bulk-rename-row-names {
+            flex: 1;
+            min-width: 0;
+            overflow-wrap: break-word;
+            word-break: break-word;
+        }
+        .bulk-rename-old {
+            color: var(--text-muted);
+            font-size: 0.9em;
+            text-decoration: line-through;
+        }
+        .bulk-rename-new {
+            color: var(--text-primary);
+        }
         #save-status {
             font-size: 0.9em;
             color: #28a745;
@@ -427,6 +451,25 @@
             <div id="curate-tree"></div>
         </div>
 
+        <div class="card">
+            <h2>Bulk Rename</h2>
+            <p class="setting-desc" style="margin-bottom: 12px;">
+                Find and replace text across every course/folder name in the library at once - handy for
+                stripping a release-group suffix off a batch of downloads. Nothing changes until you apply.
+            </p>
+            <div style="display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px;">
+                <input type="text" id="bulk-rename-find" class="hex-input"
+                       style="flex: 1; min-width: 140px; width: auto; font-family: var(--font-family);"
+                       placeholder="Find (e.g. .BOOKWARE-LERNSTUF)">
+                <input type="text" id="bulk-rename-replace" class="hex-input"
+                       style="flex: 1; min-width: 140px; width: auto; font-family: var(--font-family);"
+                       placeholder="Replace with (blank to remove)">
+                <button class="btn" onclick="previewBulkRename()">Preview</button>
+            </div>
+            <div id="bulk-rename-status" style="font-size: 0.85em; min-height: 1.2em; margin-bottom: 8px;"></div>
+            <div id="bulk-rename-preview"></div>
+        </div>
+
         <div class="card">
             <h2>Load a Course Manually</h2>
             <div class="setting-row" style="flex-direction: column; align-items: stretch; gap: 8px;">
@@ -468,6 +511,16 @@
             </div>
         </div>
 
+        <div class="card">
+            <h2>Backup &amp; Export</h2>
+            <div class="setting-row">
+                <label>Download a backup
+                    <span class="setting-desc">Settings, hidden-path curation, recently-viewed history, and every course's progress/notes - not the course files themselves.</span>
+                </label>
+                <a class="btn" href="/api/backup">Download Backup</a>
+            </div>
+        </div>
+
         <div class="actions">
             <button class="btn btn-secondary" onclick="resetSettings()">Reset to Defaults</button>
             <span id="save-status">✓ Saved</span>
@@ -740,6 +793,106 @@
         loadHiddenList();
         loadCurateLevel(null, document.getElementById('curate-tree'), true);
 
+        // ---- Bulk rename: find/replace across every course/folder name ----
+        let bulkRenameMatches = [];
+
+        function previewBulkRename() {
+            const pattern = document.getElementById('bulk-rename-find').value;
+            const replacement = document.getElementById('bulk-rename-replace').value;
+            const status = document.getElementById('bulk-rename-status');
+            const preview = document.getElementById('bulk-rename-preview');
+            preview.innerHTML = '';
+            if (!pattern) {
+                status.style.color = '#ff6b6b';
+                status.textContent = 'Enter text to find first.';
+                return;
+            }
+            status.style.color = 'var(--text-muted)';
+            status.textContent = 'Searching...';
+            fetch(`/api/bulk-rename/preview?pattern=${encodeURIComponent(pattern)}&replacement=${encodeURIComponent(replacement)}`)
+                .then(r => r.json())
+                .then(data => {
+                    bulkRenameMatches = data.matches || [];
+                    renderBulkRenamePreview();
+                })
+                .catch(() => {
+                    status.style.color = '#ff6b6b';
+                    status.textContent = 'Could not reach the server.';
+                });
+        }
+
+        function renderBulkRenamePreview() {
+            const status = document.getElementById('bulk-rename-status');
+            const preview = document.getElementById('bulk-rename-preview');
+            if (bulkRenameMatches.length === 0) {
+                status.style.color = 'var(--text-muted)';
+                status.textContent = 'No matches.';
+                preview.innerHTML = '';
+                return;
+            }
+            status.textContent = '';
+            const rows = bulkRenameMatches.map((m, i) => `
+                <div class="bulk-rename-row">
+                    <div class="bulk-rename-row-names">
+                        <div class="bulk-rename-old">${m.old_name}</div>
+                        <div class="bulk-rename-new">→ ${m.new_name}</div>
+                    </div>
+                    <button class="btn btn-secondary btn-sm" onclick="removeBulkRenameMatch(${i})">Remove</button>
+                </div>
+            `).join('');
+            const count = bulkRenameMatches.length;
+            preview.innerHTML = rows +
+                `<button class="btn" style="margin-top: 10px;" onclick="applyBulkRename()">Apply ${count} Rename${count === 1 ? '' : 's'}</button>`;
+        }
+
+        function removeBulkRenameMatch(index) {
+            bulkRenameMatches.splice(index, 1);
+            renderBulkRenamePreview();
+        }
+
+        function applyBulkRename() {
+            if (!confirm(`Rename ${bulkRenameMatches.length} item(s)? This changes real folders on disk.`)) return;
+            const status = document.getElementById('bulk-rename-status');
+            status.style.color = 'var(--text-muted)';
+            status.textContent = 'Applying...';
+            fetch('/api/bulk-rename/apply', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ items: bulkRenameMatches })
+            })
+            .then(r => r.json())
+            .then(data => {
+                const results = data.results || [];
+                const succeeded = results.filter(r => r.success).length;
+                const failed = results.filter(r => !r.success);
+                const activeCourseReset = results.some(r => r.active_course_reset);
+
+                status.style.color = failed.length ? '#ff6b6b' : '#28a745';
+                let message = `${succeeded} renamed`;
+                if (failed.length) {
+                    message += `, ${failed.length} failed: ` +
+                        failed.map(f => `${f.old_name} (${f.error})`).join('; ');
+                } else {
+                    message += '.';
+                }
+                if (activeCourseReset) {
+                    message += ' Your active course was renamed - reload the main page to pick it up under its new name.';
+                }
+                status.textContent = message;
+
+                bulkRenameMatches = [];
+                document.getElementById('bulk-rename-preview').innerHTML = '';
+                document.getElementById('bulk-rename-find').value = '';
+                document.getElementById('bulk-rename-replace').value = '';
+                loadHiddenList();
+                loadCurateLevel(null, document.getElementById('curate-tree'), true);
+            })
+            .catch(() => {
+                status.style.color = '#ff6b6b';
+                status.textContent = 'Could not reach the server.';
+            });
+        }
+
         function saveLibraryPath() {
             const input = document.getElementById('library_path');
             const status = document.getElementById('library-path-status');