diff --git a/app/UserRank/AbstractUserRank.php b/app/UserRank/AbstractUserRank.php
index f62d413e0..1d056082b 100644
--- a/app/UserRank/AbstractUserRank.php
+++ b/app/UserRank/AbstractUserRank.php
@@ -43,6 +43,10 @@ public function build(): array {
             ORDER BY 1
         ");
         $raw = $this->db->collect('bucket');
+        if (empty($raw)) {
+            // This occurs only a fresh installation
+            $raw = [0];
+        }
 
         /* We now have a list of at most 100 elements. For a number
          * of metrics the series will follow a sharp exponential
diff --git a/db/migrations/20180104060449_tables.php b/db/migrations/20180104060449_tables.php
index 245be932d..01445b5b5 100644
--- a/db/migrations/20180104060449_tables.php
+++ b/db/migrations/20180104060449_tables.php
@@ -25,12 +25,19 @@ public function down() {
 
     public function up()
     {
+        // Message to future archeologists:
+        // If this migration crashes half-way through due running it on a stricter
+        // database engine, you can move forward by uncommenting the following line
+        // and then iterating until things work.
+        // $this->down();
+
         $this->execute("ALTER DATABASE CHARACTER SET 'utf8';");
         $this->execute("ALTER DATABASE COLLATE='utf8_swedish_ci';");
         $this->execute("
 CREATE FUNCTION `binomial_ci`(p int, n int) RETURNS float
     DETERMINISTIC
-RETURN IF(n = 0,0.0,((p + 1.35336) / n - 1.6452 * SQRT((p * (n-p)) / n + 0.67668) / n) / (1 + 2.7067 / n));");
+RETURN IF(n = 0,0.0,((p + 1.35336) / n - 1.6452 * SQRT((p * (n-p)) / n + 0.67668) / n) / (1 + 2.7067 / n));
+");
 
         $this->table('lastfm_users', [
                 'id' => false,
@@ -628,7 +635,6 @@ public function up()
             ])
             ->addColumn('Date', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->create();
         $this->table('artists_similar', [
@@ -748,7 +754,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['Time'], [
                 'name' => 'Time',
@@ -775,7 +780,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['TimeAdded'], [
                 'name' => 'TimeAdded',
@@ -860,7 +864,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['UserID'], [
                 'name' => 'UserID',
@@ -940,7 +943,6 @@ public function up()
             ])
             ->addColumn('AddedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Body', 'text', [
                 'null' => true,
@@ -1328,7 +1330,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Sequence', 'integer', [
                 'null' => false,
@@ -1591,7 +1592,6 @@ public function up()
             ])
             ->addColumn('LastAttempt', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Attempts', 'integer', [
                 'null' => false,
@@ -1600,7 +1600,6 @@ public function up()
             ])
             ->addColumn('BannedUntil', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Bans', 'integer', [
                 'null' => false,
@@ -1933,7 +1932,6 @@ public function up()
             ])
             ->addColumn('StartTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('EndTime', 'datetime', [
                 'null' => true,
@@ -2085,7 +2083,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['TimeAdded'], [
                 'name' => 'TimeAdded',
@@ -2141,7 +2138,6 @@ public function up()
             ])
             ->addColumn('SentDate', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('SenderID', 'integer', [
                 'null' => false,
@@ -2693,7 +2689,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Hidden', 'integer', [
                 'null' => false,
@@ -2768,11 +2763,9 @@ public function up()
             ])
             ->addColumn('ReportedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('LastChangeTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('ModComment', 'text', [
                 'null' => true,
@@ -2981,11 +2974,9 @@ public function up()
             ])
             ->addColumn('Started', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Ended', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('ArtistID', 'integer', [
                 'null' => true,
@@ -3014,7 +3005,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->create();
         $this->table('torrents_recommended', [
@@ -3036,7 +3026,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['Time'], [
                 'name' => 'Time',
@@ -3100,7 +3089,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Message', 'text', [
                 'null' => false,
@@ -3698,7 +3686,6 @@ public function up()
             ])
             ->addColumn('AddedOn', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['UserID'], [
                 'name' => 'UserID',
@@ -3900,7 +3887,6 @@ public function up()
             ])
             ->addColumn('LastPostTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('AutoLock', 'enum', [
                 'null' => true,
@@ -3966,7 +3952,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Checked', 'integer', [
                 'null' => false,
@@ -4042,7 +4027,6 @@ public function up()
             ])
             ->addColumn('Date', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Type', 'enum', [
                 'null' => true,
@@ -4136,11 +4120,9 @@ public function up()
             ])
             ->addColumn('SentDate', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('ReceivedDate', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('UnRead', 'enum', [
                 'null' => false,
@@ -4212,7 +4194,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['TimeAdded'], [
                 'name' => 'TimeAdded',
@@ -4259,7 +4240,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Image', 'string', [
                 'null' => true,
@@ -4338,7 +4318,6 @@ public function up()
             ])
             ->addColumn('AddedOn', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['UserID'], [
                 'name' => 'UserID',
@@ -4394,7 +4373,6 @@ public function up()
             ])
             ->addColumn('AddedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Body', 'text', [
                 'null' => true,
@@ -4475,7 +4453,6 @@ public function up()
             ])
             ->addColumn('Featured', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Closed', 'enum', [
                 'null' => false,
@@ -4732,7 +4709,6 @@ public function up()
             ])
             ->addColumn('TimeFilled', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Visible', 'binary', [
                 'null' => false,
@@ -4983,7 +4959,6 @@ public function up()
             ])
             ->addColumn('Expires', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Reason', 'string', [
                 'null' => false,
@@ -5035,7 +5010,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('ThreadID', 'integer', [
                 'null' => true,
@@ -5142,7 +5116,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Image', 'string', [
                 'null' => true,
@@ -5255,7 +5228,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['UserID'], [
                 'name' => 'UserID',
@@ -5566,11 +5538,9 @@ public function up()
             ])
             ->addColumn('ResetExpires', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('JoinDate', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Inviter', 'integer', [
                 'null' => true,
@@ -5651,7 +5621,6 @@ public function up()
             ])
             ->addColumn('RatioWatchEnds', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('RatioWatchDownload', 'biginteger', [
                 'null' => false,
@@ -5666,7 +5635,6 @@ public function up()
             ])
             ->addColumn('BanDate', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('BanReason', 'enum', [
                 'null' => false,
@@ -5839,7 +5807,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('RevisionID', 'integer', [
                 'null' => true,
@@ -6083,11 +6050,9 @@ public function up()
             ])
             ->addColumn('Started', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Ended', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->create();
         $this->table('users_main', [
@@ -6138,11 +6103,9 @@ public function up()
             ])
             ->addColumn('LastLogin', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('LastAccess', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('IP', 'string', [
                 'null' => false,
@@ -6467,7 +6430,6 @@ public function up()
             ])
             ->addColumn('LastPostTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('LastPostAuthorID', 'integer', [
                 'null' => false,
@@ -6485,7 +6447,6 @@ public function up()
             ])
             ->addColumn('CreatedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['AuthorID'], [
                 'name' => 'AuthorID',
@@ -6664,7 +6625,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['TimeAdded'], [
                 'name' => 'TimeAdded',
@@ -6987,7 +6947,6 @@ public function up()
             ])
             ->addColumn('last_action', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('FreeTorrent', 'enum', [
                 'null' => false,
@@ -7003,7 +6962,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Description', 'text', [
                 'null' => true,
@@ -7025,7 +6983,6 @@ public function up()
             ])
             ->addColumn('LastReseedRequest', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('TranscodedFrom', 'integer', [
                 'null' => false,
@@ -7354,7 +7311,6 @@ public function up()
             ])
             ->addColumn('TimeAdded', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['TimeAdded'], [
                 'name' => 'TimeAdded',
@@ -7458,11 +7414,9 @@ public function up()
             ])
             ->addColumn('ResolvedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('ReportedTime', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addColumn('Reason', 'text', [
                 'null' => false,
@@ -7964,7 +7918,6 @@ public function up()
             ])
             ->addColumn('Time', 'datetime', [
                 'null' => false,
-                'default' => '0000-00-00 00:00:00',
             ])
             ->addIndex(['UserID'], [
                 'name' => 'UserID',
@@ -8203,7 +8156,6 @@ public function up()
                     'site_album_votes' => 1,
                     'site_edit_wiki' => 1,
                     'torrents_add_artist' => 1,
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8229,7 +8181,6 @@ public function up()
                     'zip_downloader' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8257,7 +8208,6 @@ public function up()
                     'forums_polls_create' => 1,
                     'zip_downloader' => 1,
                     'torrents_add_artist' => 1,
-                    'MaxCollages' => 1,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8290,7 +8240,6 @@ public function up()
                     'torrents_edit' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 3,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8314,7 +8263,6 @@ public function up()
                     'site_make_bookmarks' => 1,
                     'forums_polls_create' => 1,
                     'zip_downloader' => 1,
-                    'MaxCollages' => 1,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '10',
@@ -8327,7 +8275,6 @@ public function up()
                 'Values' => serialize([
                     'site_collages_personal' => 1,
                     'site_advanced_top10' => 1,
-                    'MaxCollages' => 1,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '28',
@@ -8339,7 +8286,6 @@ public function up()
                 'Name' => 'Recruiter',
                 'Values' => serialize([
                     'site_send_unlimited_invites' => 1,
-                    'MaxCollages' => 0,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8350,7 +8296,6 @@ public function up()
                 'Level' => 300,
                 'Name' => 'Interviewer',
                 'Values' => serialize([
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '30',
@@ -8361,7 +8306,6 @@ public function up()
                 'Level' => 310,
                 'Name' => 'Torrent Celebrity',
                 'Values' => serialize([
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8385,7 +8329,6 @@ public function up()
                     'site_make_bookmarks' => 1,
                     'site_edit_wiki' => 1,
                     'forums_polls_create' => 1,
-                    'MaxCollages' => 5,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '33',
@@ -8398,7 +8341,6 @@ public function up()
                 'Values' => serialize([
                     'site_send_unlimited_invites' => 1,
                     'forums_polls_create' => 1,
-                    'MaxCollages' => 5,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '',
@@ -8409,7 +8351,6 @@ public function up()
                 'Level' => 340,
                 'Name' => 'IRC Team',
                 'Values' => serialize([
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8435,7 +8376,6 @@ public function up()
                     'users_view_email' => 1,
                     'users_mod' => 1,
                     'admin_advanced_user_search' => 1,
-                    'MaxCollages' => 0,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8447,7 +8387,6 @@ public function up()
                 'Name' => 'Alpha Team',
                 'Values' => serialize([
                     'admin_reports' => 1,
-                    'MaxCollages' => 0,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8458,7 +8397,6 @@ public function up()
                 'Level' => 370,
                 'Name' => 'Bravo Team',
                 'Values' => serialize([
-                    'MaxCollages' => 0
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8486,8 +8424,6 @@ public function up()
                     'torrents_delete' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'torrents_fix_ghosts' => 1,
-                    'MaxCollages' => 2,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '31',
@@ -8513,7 +8449,6 @@ public function up()
                     'site_make_bookmarks' => 1,
                     'site_edit_wiki' => 1,
                     'site_can_invite_always' => 1,
-                    'MaxCollages' => 1,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '35',
@@ -8546,7 +8481,6 @@ public function up()
                     'torrents_edit' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 6,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8579,7 +8513,6 @@ public function up()
                     'torrents_edit' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 5,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8613,7 +8546,6 @@ public function up()
                     'torrents_edit' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 6,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8647,7 +8579,6 @@ public function up()
                     'torrents_edit' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'MaxCollages' => 6,
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8658,7 +8589,6 @@ public function up()
                 'Level' => 605,
                 'Name' => 'Legend',
                 'Values' => serialize([
-                    'MaxCollages' => 1
                 ]),
                 'DisplayStaff' => '0',
                 'PermittedForums' => '',
@@ -8694,8 +8624,6 @@ public function up()
                     'zip_downloader' => 1,
                     'site_proxy_images' => 1,
                     'site_search_many' => 1,
-                    'site_forums_double_post' => 1,
-                    'project_team' => 1,
                     'site_tag_aliases_read' => 1,
                     'users_edit_titles' => 1,
                     'users_edit_avatars' => 1,
@@ -8706,9 +8634,7 @@ public function up()
                     'torrents_delete' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'torrents_fix_ghosts' => 1,
                     'admin_reports' => 1,
-                    'MaxCollages' => 6,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '',
@@ -8748,8 +8674,6 @@ public function up()
                     'zip_downloader' => 1,
                     'site_proxy_images' => 1,
                     'site_search_many' => 1,
-                    'site_forums_double_post' => 1,
-                    'project_team' => 1,
                     'site_tag_aliases_read' => 1,
                     'users_edit_titles' => 1,
                     'users_edit_avatars' => 1,
@@ -8777,13 +8701,11 @@ public function up()
                     'torrents_search_fast' => 1,
                     'torrents_add_artist' => 1,
                     'edit_unknowns' => 1,
-                    'torrents_fix_ghosts' => 1,
                     'admin_manage_fls' => 1,
                     'admin_reports' => 1,
                     'admin_advanced_user_search' => 1,
                     'admin_clear_cache' => 1,
                     'admin_whitelist' => 1,
-                    'MaxCollages' => 6,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '',
@@ -8814,12 +8736,8 @@ public function up()
                     'site_view_flow' => 1,
                     'site_view_full_log' => 1,
                     'site_view_torrent_snatchlist' => 1,
-                    'site_recommend_own' => 1,
-                    'site_manage_recommendations' => 1,
                     'site_delete_tag' => 1,
                     'zip_downloader' => 1,
-                    'site_forums_double_post' => 1,
-                    'MaxCollages' => 1,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '35',
@@ -8858,16 +8776,12 @@ public function up()
                     'site_view_flow' => 1,
                     'site_view_full_log' => 1,
                     'site_view_torrent_snatchlist' => 1,
-                    'site_recommend_own' => 1,
-                    'site_manage_recommendations' => 1,
                     'site_delete_tag' => 1,
                     'site_disable_ip_history' => 1,
                     'zip_downloader' => 1,
                     'site_proxy_images' => 1,
                     'site_search_many' => 1,
                     'site_collages_recover' => 1,
-                    'site_forums_double_post' => 1,
-                    'project_team' => 1,
                     'site_tag_aliases_read' => 1,
                     'users_edit_ratio' => 1,
                     'users_edit_titles' => 1,
@@ -8904,7 +8818,6 @@ public function up()
                     'edit_unknowns' => 1,
                     'torrents_edit_vanityhouse' => 1,
                     'artist_edit_vanityhouse' => 1,
-                    'torrents_fix_ghosts' => 1,
                     'admin_manage_blog' => 1,
                     'admin_manage_fls' => 1,
                     'admin_reports' => 1,
@@ -8914,7 +8827,6 @@ public function up()
                     'admin_clear_cache' => 1,
                     'admin_whitelist' => 1,
                     'admin_manage_wiki' => 1,
-                    'MaxCollages' => 5,
                 ]),
                 'DisplayStaff' => '1',
                 'PermittedForums' => '',
@@ -8948,12 +8860,9 @@ public function up()
                     'site_delete_artist' => 1,
                     'site_moderate_forums' => 1,
                     'site_admin_forums' => 1,
-                    'site_forums_double_post' => 1,
                     'site_view_flow' => 1,
                     'site_view_full_log' => 1,
                     'site_view_torrent_snatchlist' => 1,
-                    'site_recommend_own' => 1,
-                    'site_manage_recommendations' => 1,
                     'site_delete_tag' => 1,
                     'site_disable_ip_history' => 1,
                     'zip_downloader' => 1,
@@ -8997,7 +8906,6 @@ public function up()
                     'torrents_freeleech' => 1,
                     'torrents_search_fast' => 1,
                     'torrents_hide_dnu' => 1,
-                    'torrents_fix_ghosts' => 1,
                     'admin_manage_news' => 1,
                     'admin_manage_blog' => 1,
                     'admin_manage_polls' => 1,
@@ -9021,7 +8929,6 @@ public function up()
                     'edit_unknowns' => 1,
                     'forums_polls_create' => 1,
                     'forums_polls_moderate' => 1,
-                    'project_team' => 1,
                     'torrents_edit_vanityhouse' => 1,
                     'artist_edit_vanityhouse' => 1,
                     'site_tag_aliases_read' => 1,
diff --git a/db/migrations/20180729085427_referral_tracking.php b/db/migrations/20180729085427_referral_tracking.php
index 710116fcb..f28204329 100644
--- a/db/migrations/20180729085427_referral_tracking.php
+++ b/db/migrations/20180729085427_referral_tracking.php
@@ -33,7 +33,7 @@ public function change() {
             ->addColumn('Username', 'string', ['limit' => 100])
             ->addColumn('Site', 'string', ['limit' => 100])
             ->addColumn('Created', 'timestamp', ['default' => 'CURRENT_TIMESTAMP'])
-            ->addColumn('Joined', 'timestamp', ['default' => '0000-00-00 00:00:00'])
+            ->addColumn('Joined', 'timestamp', ['null' => true])
             ->addColumn('IP', 'string', ['limit' => 15])
             ->addColumn('InviteKey', 'string', ['limit' => 32])
             ->addColumn('Active', 'boolean', ['default' => false])
diff --git a/db/migrations/20181229185143_delete_torrent.php b/db/migrations/20181229185143_delete_torrent.php
index 6bf1895fd..2d8d5b96b 100644
--- a/db/migrations/20181229185143_delete_torrent.php
+++ b/db/migrations/20181229185143_delete_torrent.php
@@ -58,7 +58,7 @@ public function up() {
              ->addColumn('FreeLeechType', 'enum', ['values' => ['0','1','2','3','4','5','6','7']])
              ->addColumn('Time', 'timestamp')
              ->addColumn('Description', 'text', ['null' => true])
-             ->addColumn('LastReseedRequest', 'timestamp')
+             ->addColumn('LastReseedRequest', 'timestamp', ['null' => true])
              ->addColumn('TranscodedFrom', 'integer', ['length' => 10])
              ->create();
 
diff --git a/db/migrations/20190212082403_bonus_point_pool.php b/db/migrations/20190212082403_bonus_point_pool.php
index 855829c7f..5999de185 100644
--- a/db/migrations/20190212082403_bonus_point_pool.php
+++ b/db/migrations/20190212082403_bonus_point_pool.php
@@ -31,8 +31,8 @@ public function up()
         $this->table('bonus_pool', ['id' => false, 'primary_key' => 'ID'])
             ->addColumn('ID', 'integer', ['limit' => 6, 'signed' => false, 'identity' => true])
             ->addColumn('Name', 'string', ['limit' => 80])
-            ->addColumn('SinceDate', 'timestamp')
-            ->addColumn('UntilDate', 'timestamp')
+            ->addColumn('SinceDate', 'timestamp', ['default' => 'CURRENT_TIMESTAMP'])
+            ->addColumn('UntilDate', 'timestamp', ['default' => 'CURRENT_TIMESTAMP'])
             ->addColumn('Total', 'float', ['default' => 0])
             ->create();
 
diff --git a/db/migrations/20190216130101_payment_reminder.php b/db/migrations/20190216130101_payment_reminder.php
index 42ef2b6f7..3bc6185ea 100644
--- a/db/migrations/20190216130101_payment_reminder.php
+++ b/db/migrations/20190216130101_payment_reminder.php
@@ -31,7 +31,7 @@ public function change()
         $this->table('payment_reminders', ['id' => false, 'primary_key' => 'ID'])
              ->addColumn('ID', 'integer', ['limit' => 10, 'signed' => false, 'identity' => true])
              ->addColumn('Text', 'string', ['limit' => 100])
-             ->addColumn('Expiry', 'timestamp', ['default' => '0000-00-00 00:00:00'])
+             ->addColumn('Expiry', 'timestamp', ['null' => true])
              ->addColumn('Active', 'boolean', ['default' => true])
              ->create();
     }
diff --git a/db/migrations/20200219075508_drop_secret.php b/db/migrations/20200219075508_drop_secret.php
index 360fc424f..b2814246f 100644
--- a/db/migrations/20200219075508_drop_secret.php
+++ b/db/migrations/20200219075508_drop_secret.php
@@ -25,7 +25,7 @@ public function up()
              ->changeColumn('Info', 'text', ['limit' => 65536, 'default' => ''])
              ->changeColumn('AdminComment', 'text', ['limit' => 65536, 'default' => ''])
              ->changeColumn('SiteOptions', 'text', ['limit' => 65536, 'default' => ''])
-             ->changeColumn('Warned', 'timestamp', ['default' => '0000-00-00 00:00:00'])
+             ->changeColumn('Warned', 'timestamp', ['null' => true])
              ->changeColumn('Avatar', 'string', ['limit' => 255, 'default' => ''])
              ->changeColumn('SupportFor', 'string', ['limit' => 255, 'default' => ''])
              // who needs self documenting enum values when you have comments?
diff --git a/design/privatefooter.php b/design/privatefooter.php
index ef35acb3b..00a8fdf4d 100644
--- a/design/privatefooter.php
+++ b/design/privatefooter.php
@@ -35,8 +35,9 @@
 }
 
 $LastActive = false;
-if (count($UserSessions) > 1) {
-    foreach ($UserSessions as $ThisSessionID => $Session) {
+$sessions = (new Gazelle\Session($Viewer->id()))->loadSessions();
+if (count($sessions) > 1) {
+    foreach ($sessions as $ThisSessionID => $Session) {
         if ($ThisSessionID != $SessionID) {
             $LastActive = $Session;
             break;
diff --git a/sections/contest/admin.php b/sections/contest/admin.php
index 9e147a18a..842bd76cb 100644
--- a/sections/contest/admin.php
+++ b/sections/contest/admin.php
@@ -19,6 +19,8 @@
     $contest = new Gazelle\Contest((int)$_GET['id']);
 } elseif (!$create) {
     $contest = $contestMan->currentContest();
+} else {
+    $contest = null;
 }
 
 View::show_header('contest admin');
diff --git a/sections/random/index.php b/sections/random/index.php
index 3da64c3c1..1256a2a6c 100644
--- a/sections/random/index.php
+++ b/sections/random/index.php
@@ -2,7 +2,7 @@
 
 enforce_login();
 
-switch ($_REQUEST['action']) {
+switch ($_REQUEST['action'] ?? '') {
     case 'artist':
         $page = 'artist';
         $DB->prepared_query("
diff --git a/sections/tools/data/economic_stats.php b/sections/tools/data/economic_stats.php
index ab3ef7b8d..b532b09b1 100644
--- a/sections/tools/data/economic_stats.php
+++ b/sections/tools/data/economic_stats.php
@@ -34,6 +34,7 @@
 $Eco = new \Gazelle\Stats\Economic;
 $totalEnabled = $Eco->get('totalEnabled');
 $totalPeerUsers = $Eco->get('totalPeerUsers');
+$totalTorrents = $Eco->get('totalTorrents');
 
 ?>
 <div class="thin">
@@ -71,16 +72,16 @@
                 <li><strong>Seeder/snatch ratio: </strong><?= Format::get_ratio_html($Eco->get('totalSeeders'), $Eco->get('totalOverallSnatches')) ?></li>
                 <br />
                 <li><strong>Total users in at least 1 swarm: </strong><?= number_format($totalPeerUsers) ?></li>
-                <li><strong>Mean seeding per user in at least 1 swarm: </strong><?= number_format($Eco->get('totalSeeders') / $totalPeerUsers, 2) ?></li>
-                <li><strong>Mean leeching per user in at least 1 swarm: </strong><?= number_format($Eco->get('totalLeechers') / $totalPeerUsers, 2) ?></li>
-                <li><strong>Mean snatches per user in at least 1 swarm: </strong><?= number_format($Eco->get('totalSnatches') / $totalPeerUser, 2) ?></li>
+                <li><strong>Mean seeding per user in at least 1 swarm: </strong><?= number_format($totalPeerUsers ? $Eco->get('totalSeeders') / $totalPeerUsers : 0, 2) ?></li>
+                <li><strong>Mean leeching per user in at least 1 swarm: </strong><?= number_format($totalPeerUsers ? $Eco->get('totalLeechers') / $totalPeerUsers : 0, 2) ?></li>
+                <li><strong>Mean snatches per user in at least 1 swarm: </strong><?= number_format($totalPeerUsers ? $Eco->get('totalSnatches') / $totalPeerUsers : 0, 2) ?></li>
             </ul>
             </td>
             <td style="vertical-align:top;" width="50%">
             <ul class="stats nobullet">
-                <li><strong>Mean seeders per torrent: </strong><?= number_format($Eco->get('totalSeeders') / $Eco->get('totalTorrents'), 2) ?></li>
-                <li><strong>Mean leechers per torrent: </strong><?= number_format($Eco->get('totalLeechers') / $Eco->get('totalTorrents'), 2) ?></li>
-                <li><strong>Mean snatches per torrent: </strong><?= number_format($Eco->get('totalSnatches') / $Eco->get('totalTorrents'), 2) ?></li>
+                <li><strong>Mean seeders per torrent: </strong><?= number_format($totalTorrents ? $Eco->get('totalSeeders') / $totalTorrents : 0, 2) ?></li>
+                <li><strong>Mean leechers per torrent: </strong><?= number_format($totalTorrents ? $Eco->get('totalLeechers') / $totalTorrents : 0, 2) ?></li>
+                <li><strong>Mean snatches per torrent: </strong><?= number_format($totalTorrents ? $Eco->get('totalSnatches') / $totalTorrents : 0, 2) ?></li>
                 <br />
                 <li><strong>Mean seeding per user: </strong><?= number_format($Eco->get('totalSeeders') / $totalEnabled, 2) ?></li>
                 <li><strong>Mean leeching per user: </strong><?= number_format($Eco->get('totalLeechers') / $totalEnabled, 2) ?></li>
diff --git a/sections/tools/managers/global_notification.php b/sections/tools/managers/global_notification.php
index 042ddca0d..5c17934a0 100644
--- a/sections/tools/managers/global_notification.php
+++ b/sections/tools/managers/global_notification.php
@@ -1,19 +1,23 @@
 <?php
 
-use \Gazelle\Manager\Notification;
+if (!$Viewer->permitted("admin_global_notification")) {
+    error(403);
+}
 
-if (!check_perms("admin_global_notification")) {
-    error(404);
+$GlobalNotification = (new Gazelle\Manager\Notification)->global();
+if ($GlobalNotification !== false) {
+    $Expiration = $GlobalNotification['Expiration'] / 60;
+} else {
+    $Expiration = '';
+    $GlobalNotification = [
+        'Message'    => '',
+        'URL'        => '',
+        'Importance' => '',
+    ];
 }
 
 View::show_header("Global Notification");
-
-$notification = new Notification;
-$GlobalNotification = $notification->global();
-
-$Expiration = $GlobalNotification['Expiration'] ? $GlobalNotification['Expiration'] / 60 : "";
 ?>
-
 <h2>Set global notification</h2>
 
 <div class="thin box pad">
@@ -37,7 +41,7 @@
                 <td class="label">Importance</td>
                 <td>
                     <select name="importance" id="importance">
-<?php   foreach (Notification::$Importances as $Key => $Value) { ?>
+<?php   foreach (Gazelle\Manager\Notification::$Importances as $Key => $Value) { ?>
                         <option value="<?=$Value?>"<?=$Value == $GlobalNotification['Importance'] ? ' selected="selected"' : ''?>><?=ucfirst($Key)?></option>
 <?php   } ?>
                     </select>
diff --git a/sections/tools/managers/rate_limit.php b/sections/tools/managers/rate_limit.php
index ac62af854..41ac5483a 100644
--- a/sections/tools/managers/rate_limit.php
+++ b/sections/tools/managers/rate_limit.php
@@ -17,8 +17,8 @@
                 ['factor', '1', 'number', 'factor must be set (usually, a number larger than 1.0)', ['minlength' => 1, 'allowperiod' => true]],
                 ['overshoot', '1', 'number', 'overshoot must be set', ['minlength' => 1]],
             ]);
-            if (!$Val->validate($_POST)) {
-                error($Val->errorMessage());
+            if (!$val->validate($_POST)) {
+                error($val->errorMessage());
             }
             $PRL->save($_POST['class'], $_POST['factor'], $_POST['overshoot']);
         } else {
@@ -97,7 +97,7 @@ class.</p>
             <select name="class">
 <?php
     foreach ($permList as $p) {
-        if ($seen[$p['ID']]) {
+        if ($seen[$p['ID']] ?? true) {
             continue;
         }
 ?>
@@ -117,5 +117,4 @@ class.</p>
 </form>
 <?php
 }
-
 View::show_footer();
diff --git a/templates/admin/cache-db-stats.twig b/templates/admin/cache-db-stats.twig
index 652c2be92..7221712ee 100644
--- a/templates/admin/cache-db-stats.twig
+++ b/templates/admin/cache-db-stats.twig
@@ -140,12 +140,12 @@
                 <td>{{ db_stats.Com_insert.Value|number_format }} <span style="float: right;">(100.000%)</span></td>
             </tr>
             <tr>
-                <td{% if mem_stats.incr_hits/(mem_stats.incr_hits + mem_stats.incr_misses) < 0.7 %} class="invalid"{% endif %}>Cache increment:</td>
-                <td>{{ mem_stats.incr_hits|number_format }} <span style="float: right;">({{ (mem_stats.incr_hits / (mem_stats.incr_hits + mem_stats.incr_misses) * 100)|number_format(3) }}%)</span></td>
+                <td{% if mem_stats.incr_hits > 0 and mem_stats.incr_hits/(mem_stats.incr_hits + mem_stats.incr_misses) < 0.7 %} class="invalid"{% endif %}>Cache increment:</td>
+                <td>{{ mem_stats.incr_hits|number_format }} <span style="float: right;">({{ (mem_stats.incr_hits / (mem_stats.incr_hits + mem_stats.incr_misses + 1) * 100)|number_format(3) }}%)</span></td>
             </tr>
             <tr>
-                <td{% if mem_stats.decr_hits / (mem_stats.decr_hits + mem_stats.decr_misses) < 0.7 %} class="invalid"{% endif %}>Cache decrement:</td>
-                <td>{{ mem_stats.decr_hits|number_format }} <span style="float: right;">({{ (mem_stats.decr_hits / (mem_stats.decr_hits + mem_stats.decr_misses) * 100)|number_format(3) }}%)</span></td>
+                <td{% if mem_stats.incr_hits > 0 and mem_stats.decr_hits / (mem_stats.decr_hits + mem_stats.decr_misses) < 0.7 %} class="invalid"{% endif %}>Cache decrement:</td>
+                <td>{{ mem_stats.decr_hits|number_format }} <span style="float: right;">({{ (mem_stats.decr_hits / (mem_stats.decr_hits + mem_stats.decr_misses + 1) * 100)|number_format(3) }}%)</span></td>
             </tr>
             <tr><td colspan="2"><strong>CAS/Update (Success)</strong></td></tr>
             <tr>
diff --git a/templates/admin/payment.twig b/templates/admin/payment.twig
index 719e36d21..6f22c7551 100644
--- a/templates/admin/payment.twig
+++ b/templates/admin/payment.twig
@@ -110,9 +110,9 @@
         </tr>
         <tr>
             <td>Target %</td>
-            <td>{{ (donorMan.totalMonth( 1)/(total / 12) * 100)|number_format(1) }}</td>
-            <td>{{ (donorMan.totalMonth( 3)/(total /  4) * 100)|number_format(1) }}</td>
-            <td>{{ (donorMan.totalMonth(12)/(total     ) * 100)|number_format(1) }}</td>
+            <td>{% if total > 0 %}{{ (donorMan.totalMonth( 1)/(total / 12) * 100)|number_format(1) }}{% else %}100.0%{% endif %}</td>
+            <td>{% if total > 0 %}{{ (donorMan.totalMonth( 3)/(total /  4) * 100)|number_format(1) }}{% else %}100.0%{% endif %}</td>
+            <td>{% if total > 0 %}{{ (donorMan.totalMonth(12)/(total     ) * 100)|number_format(1) }}{% else %}100.0%{% endif %}</td>
         </tr>
     </table>
 </div>