diff --git a/cps/db.py b/cps/db.py
index 9c48cfbb..a8a33601 100755
--- a/cps/db.py
+++ b/cps/db.py
@@ -11,10 +11,8 @@ from ub import config
 import ub
 
 session = None
-cc_exceptions = None
+cc_exceptions = ['datetime', 'int', 'comments', 'float', 'composite', 'series']
 cc_classes = None
-cc_ids = None
-books_custom_column_links = None
 engine = None
 
 
@@ -283,12 +281,9 @@ class Custom_Columns(Base):
 
 
 def setup_db():
-    global session
-    global cc_exceptions
-    global cc_classes
-    global cc_ids
-    global books_custom_column_links
     global engine
+    global session
+    global cc_classes
 
     if config.config_calibre_dir is None or config.config_calibre_dir ==  u'':
         return False
@@ -297,7 +292,6 @@ def setup_db():
     engine = create_engine('sqlite:///{0}'.format(dbpath.encode('utf-8')), echo=False, isolation_level="SERIALIZABLE")
     try:
         conn = engine.connect()
-
     except:
         content = ub.session.query(ub.Settings).first()
         content.config_calibre_dir = None
@@ -311,43 +305,43 @@ def setup_db():
     config.loadSettings()
     conn.connection.create_function('title_sort', 1, title_sort)
 
-    cc = conn.execute("SELECT id, datatype FROM custom_columns")
+    if not cc_classes:
+        cc = conn.execute("SELECT id, datatype FROM custom_columns")
 
-    cc_ids = []
-    cc_exceptions = ['datetime', 'int', 'comments', 'float', 'composite', 'series']
-    books_custom_column_links = {}
-    cc_classes = {}
-    for row in cc:
-        if row.datatype not in cc_exceptions:
-            books_custom_column_links[row.id] = Table('books_custom_column_' + str(row.id) + '_link', Base.metadata,
-                                                      Column('book', Integer, ForeignKey('books.id'),
-                                                             primary_key=True),
-                                                      Column('value', Integer,
-                                                             ForeignKey('custom_column_' + str(row.id) + '.id'),
-                                                             primary_key=True)
-                                                      )
-            cc_ids.append([row.id, row.datatype])
-            if row.datatype == 'bool':
-                ccdict = {'__tablename__': 'custom_column_' + str(row.id),
-                          'id': Column(Integer, primary_key=True),
-                          'book': Column(Integer, ForeignKey('books.id')),
-                          'value': Column(Boolean)}
+        cc_ids = []
+        books_custom_column_links = {}
+        cc_classes = {}
+        for row in cc:
+            if row.datatype not in cc_exceptions:
+                books_custom_column_links[row.id] = Table('books_custom_column_' + str(row.id) + '_link', Base.metadata,
+                                                          Column('book', Integer, ForeignKey('books.id'),
+                                                                 primary_key=True),
+                                                          Column('value', Integer,
+                                                                 ForeignKey('custom_column_' + str(row.id) + '.id'),
+                                                                 primary_key=True)
+                                                          )
+                cc_ids.append([row.id, row.datatype])
+                if row.datatype == 'bool':
+                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
+                              'id': Column(Integer, primary_key=True),
+                              'book': Column(Integer, ForeignKey('books.id')),
+                              'value': Column(Boolean)}
+                else:
+                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
+                              'id': Column(Integer, primary_key=True),
+                              'value': Column(String)}
+                cc_classes[row.id] = type('Custom_Column_' + str(row.id), (Base,), ccdict)
+
+        for id in cc_ids:
+            if id[1] == 'bool':
+                setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
+                                                                           primaryjoin=(
+                                                                           Books.id == cc_classes[id[0]].book),
+                                                                           backref='books'))
             else:
-                ccdict = {'__tablename__': 'custom_column_' + str(row.id),
-                          'id': Column(Integer, primary_key=True),
-                          'value': Column(String)}
-            cc_classes[row.id] = type('Custom_Column_' + str(row.id), (Base,), ccdict)
-
-    for id in cc_ids:
-        if id[1] == 'bool':
-            setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
-                                                                       primaryjoin=(
-                                                                       Books.id == cc_classes[id[0]].book),
-                                                                       backref='books'))
-        else:
-            setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
-                                                                       secondary=books_custom_column_links[id[0]],
-                                                                       backref='books'))
+                setattr(Books, 'custom_column_' + str(id[0]), relationship(cc_classes[id[0]],
+                                                                           secondary=books_custom_column_links[id[0]],
+                                                                           backref='books'))
 
     # Base.metadata.create_all(engine)
     Session = sessionmaker()
diff --git a/cps/static/js/libs/bootstrap-rating-input.min.js b/cps/static/js/libs/bootstrap-rating-input.min.js
new file mode 100644
index 00000000..0398742e
--- /dev/null
+++ b/cps/static/js/libs/bootstrap-rating-input.min.js
@@ -0,0 +1 @@
+!function(a){"use strict";function b(a){return"[data-value"+(a?"="+a:"")+"]"}function c(a,b,c){var d=c.activeIcon,e=c.inactiveIcon;a.removeClass(b?e:d).addClass(b?d:e)}function d(b,c){var d=a.extend({},i,b.data(),c);return d.inline=""===d.inline||d.inline,d.readonly=""===d.readonly||d.readonly,d.clearable===!1?d.clearableLabel="":d.clearableLabel=d.clearable,d.clearable=""===d.clearable||d.clearable,d}function e(b,c){if(c.inline)var d=a('<span class="rating-input"></span>');else var d=a('<div class="rating-input"></div>');d.addClass(b.attr("class")),d.removeClass("rating");for(var e=c.min;e<=c.max;e++)d.append('<i class="'+c.iconLib+'" data-value="'+e+'"></i>');return c.clearable&&!c.readonly&&d.append("&nbsp;").append('<a class="'+f+'"><i class="'+c.iconLib+" "+c.clearableIcon+'"/>'+c.clearableLabel+"</a>"),d}var f="rating-clear",g="."+f,h="hidden",i={min:1,max:5,"empty-value":0,iconLib:"glyphicon",activeIcon:"glyphicon-star",inactiveIcon:"glyphicon-star-empty",clearable:!1,clearableIcon:"glyphicon-remove",clearableRemain:!1,inline:!1,readonly:!1},j=function(a,b){var c=this.$input=a;this.options=d(c,b);var f=this.$el=e(c,this.options);c.addClass(h).before(f),c.attr("type","hidden"),this.highlight(c.val())};j.VERSION="0.4.0",j.DEFAULTS=i,j.prototype={clear:function(){this.setValue(this.options["empty-value"])},setValue:function(a){this.highlight(a),this.updateInput(a)},highlight:function(a,d){var e=this.options,f=this.$el;if(a>=this.options.min&&a<=this.options.max){var i=f.find(b(a));c(i.prevAll("i").andSelf(),!0,e),c(i.nextAll("i"),!1,e)}else c(f.find(b()),!1,e);d||(this.options.clearableRemain?f.find(g).removeClass(h):a&&a!=this.options["empty-value"]?f.find(g).removeClass(h):f.find(g).addClass(h))},updateInput:function(a){var b=this.$input;b.val()!=a&&b.val(a).change()}};var k=a.fn.rating=function(c){return this.filter("input[type=number]").each(function(){var d=a(this),e="object"==typeof c&&c||{},f=new j(d,e);f.options.readonly||f.$el.on("mouseenter",b(),function(){f.highlight(a(this).data("value"),!0)}).on("mouseleave",b(),function(){f.highlight(d.val(),!0)}).on("click",b(),function(){f.setValue(a(this).data("value"))}).on("click",g,function(){f.clear()})})};k.Constructor=j,a(function(){a("input.rating[type=number]").each(function(){a(this).rating()})})}(jQuery);
\ No newline at end of file
diff --git a/cps/static/js/main.js b/cps/static/js/main.js
index 8b0b099f..7a498f36 100644
--- a/cps/static/js/main.js
+++ b/cps/static/js/main.js
@@ -65,6 +65,13 @@ $(function() {
             }
         });
     });
+    $("#restart_database").click(function() {
+        $.ajax({
+            dataType: 'json',
+            url: window.location.pathname+"/../../shutdown",
+            data: {"parameter":2}
+        });
+    });
     $("#perform_update").click(function() {
         $('#spinner2').show();
         $.ajax({
diff --git a/cps/templates/admin.html b/cps/templates/admin.html
index b386e4ff..18d99ab8 100644
--- a/cps/templates/admin.html
+++ b/cps/templates/admin.html
@@ -80,6 +80,7 @@
         <div>{{_('Current commit timestamp')}}: <span>{{commit}} </span></div>
         <div class="hidden" id="update_info">{{_('Newest commit timestamp')}}: <span></span></div>
         <p></p>
+        <div class="btn btn-default" id="restart_database">{{_('Reconnect to Calibre DB')}}</div>
         <div class="btn btn-default" data-toggle="modal" data-target="#RestartDialog">{{_('Restart Calibre-web')}}</div>
         <div class="btn btn-default" data-toggle="modal" data-target="#ShutdownDialog">{{_('Stop Calibre-web')}}</div>
         <div class="btn btn-default" id="check_for_update">{{_('Check for update')}}</div>
diff --git a/cps/templates/book_edit.html b/cps/templates/book_edit.html
index 32452dd8..19abf315 100644
--- a/cps/templates/book_edit.html
+++ b/cps/templates/book_edit.html
@@ -39,7 +39,7 @@
       </div>
       <div class="form-group">
         <label for="rating">{{_('Rating')}}</label>
-        <input type="number" min="0" max="5" step="1" class="form-control" name="rating" id="rating" value="{% if book.ratings %}{{book.ratings[0].rating / 2}}{% endif %}">
+        <input type="number"  name="rating" id="rating" class="rating input-lg" data-clearable="" value="{% if book.ratings %}{{(book.ratings[0].rating / 2)|int}}{% endif %}">
       </div>
       <div class="form-group">
         <label for="cover_url">{{_('Cover URL (jpg)')}}</label>
@@ -114,6 +114,7 @@
 {% block js %}
 <script src="{{ url_for('static', filename='js/libs/typeahead.bundle.js') }}"></script>
 <script src="{{ url_for('static', filename='js/edit_books.js') }}"></script>
+<script src="{{ url_for('static', filename='js/libs/bootstrap-rating-input.min.js') }}"></script>
 {% endblock %}
 {% block header %}
 <link href="{{ url_for('static', filename='css/libs/typeahead.css') }}" rel="stylesheet" media="screen">
diff --git a/cps/templates/feed.xml b/cps/templates/feed.xml
index 5bda14f9..52fb2ba3 100644
--- a/cps/templates/feed.xml
+++ b/cps/templates/feed.xml
@@ -35,6 +35,7 @@
     <uri>https://github.com/janeczku/calibre-web</uri>
   </author>
 
+  {% if entries[0] %}
   {% for entry in entries %}
   <entry>
     <title>{{entry.title}}</title>
@@ -60,6 +61,7 @@
     {% endfor %}
   </entry>
   {% endfor %}
+  {% endif %}
   {% for entry in listelements %}
   <entry>
     <title>{{entry.name}}</title>
diff --git a/cps/templates/index.html b/cps/templates/index.html
index 7ab46a7b..744fea89 100755
--- a/cps/templates/index.html
+++ b/cps/templates/index.html
@@ -40,6 +40,7 @@
 <div class="discover load-more">
   <h2>{{title}}</h2>
   <div class="row">
+    {% if entries[0] %}
     {% for entry in entries %}
     <div id="books" class="col-sm-3 col-lg-2 col-xs-6 book">
       <div class="cover">
@@ -76,6 +77,7 @@
       </div>
     </div>
     {% endfor %}
+  {% endif %}
   </div>
 </div>
 {% endblock %}
diff --git a/cps/web.py b/cps/web.py
index 7008a622..8f36f79f 100755
--- a/cps/web.py
+++ b/cps/web.py
@@ -136,6 +136,15 @@ lm.anonymous_user = ub.Anonymous
 app.secret_key = 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT'
 db.setup_db()
 
+if config.config_log_level == logging.DEBUG :
+    logging.getLogger("sqlalchemy.engine").addHandler(file_handler)
+    logging.getLogger("sqlalchemy.engine").setLevel(logging.INFO)
+    logging.getLogger("sqlalchemy.pool").addHandler(file_handler)
+    logging.getLogger("sqlalchemy.pool").setLevel(config.config_log_level)
+    logging.getLogger("sqlalchemy.orm").addHandler(file_handler)
+    logging.getLogger("sqlalchemy.orm").setLevel(config.config_log_level)
+
+
 @babel.localeselector
 def get_locale():
     # if a user is logged in, use the locale from the user settings
@@ -550,7 +559,13 @@ def feed_hot():
     hot_books = all_books.offset(off).limit(config.config_books_per_page)
     entries = list()
     for book in hot_books:
-        entries.append(db.session.query(db.Books).filter(filter).filter(db.Books.id == book.Downloads.book_id).first())
+        downloadBook = db.session.query(db.Books).filter(db.Books.id == book.Downloads.book_id).first()
+        if downloadBook:
+            entries.append(
+                db.session.query(db.Books).filter(filter).filter(db.Books.id == book.Downloads.book_id).first())
+        else:
+            ub.session.query(ub.Downloads).filter(book.Downloads.book_id == ub.Downloads.book_id).delete()
+            ub.session.commit()
     numBooks = entries.__len__()
     pagination = Pagination((int(off) / (int(config.config_books_per_page)) + 1), config.config_books_per_page, numBooks)
     xml = render_title_template('feed.xml', entries=entries, pagination=pagination)
@@ -839,7 +854,13 @@ def hot_books(page):
     hot_books = all_books.offset(off).limit(config.config_books_per_page)
     entries = list()
     for book in hot_books:
-        entries.append(db.session.query(db.Books).filter(filter).filter(db.Books.id == book.Downloads.book_id).first())
+        downloadBook = db.session.query(db.Books).filter(db.Books.id == book.Downloads.book_id).first()
+        if downloadBook:
+            entries.append(
+                db.session.query(db.Books).filter(filter).filter(db.Books.id == book.Downloads.book_id).first())
+        else:
+            ub.session.query(ub.Downloads).filter(book.Downloads.book_id == ub.Downloads.book_id).delete()
+            ub.session.commit()
     numBooks = entries.__len__()
     pagination = Pagination(page, config.config_books_per_page, numBooks)
     return render_title_template('index.html', random=random, entries=entries, pagination=pagination,
@@ -1085,6 +1106,11 @@ def shutdown():
             showtext['text'] = _(u'Performing shutdown of server, please close window')
         return json.dumps(showtext)
     else:
+        if task == 2:
+            db.session.close()
+            db.engine.dispose()
+            db.setup_db()
+            return json.dumps({})
         abort(404)
 
 @app.route("/update")