improved Modal with zoom and pagination. also implementing thumbnail generation

app/main.py

@@ -30,11 +30,22 @@ def index():
 @main.route('/gallery')
 @login_required
 def gallery():
-    recent_images = 21
+    per_page = 35
+    page = request.args.get('page', 1, type=int)
+
     images = ImageRecord.query.order_by(
         desc(func.coalesce(ImageRecord.taken_at, ImageRecord.imported_at))
-    ).limit(recent_images).all()
-    return render_template('gallery.html', images=images)
+    ).paginate(page=page, per_page=per_page)
+
+    return render_template(
+        'gallery.html',
+        images=images,
+        has_next=images.has_next,
+        next_page_url=url_for('main.gallery', page=images.next_num) if images.has_next else '',
+        has_prev=images.has_prev,
+        prev_page_url=url_for('main.gallery', page=images.prev_num) if images.has_prev else ''
+    )
+
 
 @main.route('/images/<path:filename>')
 def serve_image(filename):
@@ -43,12 +54,21 @@ def serve_image(filename):
 @main.route('/artist/<artist_name>')
 @login_required
 def artist_gallery(artist_name):
-    per_page=49
+    per_page = 35
     page = request.args.get('page', 1, type=int)
     images = ImageRecord.query.filter_by(artist=artist_name).order_by(
         desc(func.coalesce(ImageRecord.taken_at, ImageRecord.imported_at))
     ).paginate(page=page, per_page=per_page)
-    return render_template('artist_gallery.html', images=images, artist=artist_name)
+
+    return render_template(
+        'artist_gallery.html',
+        images=images,
+        artist=artist_name,
+        has_next=images.has_next,
+        next_page_url=url_for('main.artist_gallery', artist_name=artist_name, page=images.next_num) if images.has_next else '',
+        has_prev=images.has_prev,
+        prev_page_url=url_for('main.artist_gallery', artist_name=artist_name, page=images.prev_num) if images.has_prev else ''
+    )
 
 @main.route('/artists')
 @login_required
@@ -82,12 +102,28 @@ def settings():
         abort(403)
     return render_template('settings.html')
 
+@main.route('/trigger-thumbnail-generation', methods=['POST'])
+@login_required
+def trigger_thumbnail_generation():
+    if not current_user.is_admin:
+        flash("You do not have permission to perform this action.", "danger")
+        return redirect(url_for('main.settings'))
+
+    try:
+        with open('/import/thumbnail.flag', 'w') as f:
+            f.write("trigger")
+        flash("Thumbnail regeneration has been triggered.", "success")
+    except Exception as e:
+        flash(f"Failed to trigger thumbnail regeneration: {e}", "danger")
+
+    return redirect(url_for('main.settings'))
+
 @main.route('/import-images')
 @login_required
 def trigger_image_import():
     with open('/import/trigger.flag', 'w') as f:
         f.write('start')
-    flash("Image import triggered.")
+    flash("Image import triggered.", "success")
     return redirect(url_for('main.settings'))
 
 @main.route('/reset-db', methods=['POST'])