diff --git a/includes/ajaxHandler.class.php b/includes/ajaxHandler.class.php
index 9dc53b88..656d00a5 100644
--- a/includes/ajaxHandler.class.php
+++ b/includes/ajaxHandler.class.php
@@ -629,7 +629,7 @@ class AjaxHandler
                 {
                     if (!isset($this->post['id']))
                     {
-                        $res = DB::Aowow()->selectRow('SELECT max(id) as max, count(id) as num FROM ?_account_weightscales WHERE account = ?d', User::$id);
+                        $res = DB::Aowow()->selectRow('SELECT max(id) as max, count(id) as num FROM ?_account_weightscales WHERE userId = ?d', User::$id);
                         if ($res['num'] < 5)            // more or less hard-defined in LANG.message_weightscalesaveerror
                             $this->post['id'] = ++$res['max'];
                         else
@@ -642,7 +642,7 @@ class AjaxHandler
                         return 0;
                 }
                 else if ($this->post('delete') && $this->post('id'))
-                    DB::Aowow()->query('DELETE FROM ?_account_weightscales WHERE id = ?d AND account = ?d', intVal($this->post('id')), User::$id);
+                    DB::Aowow()->query('DELETE FROM ?_account_weightscales WHERE id = ?d AND userId = ?d', intVal($this->post('id')), User::$id);
                 else
                     return 0;
         }
@@ -782,7 +782,7 @@ class AjaxHandler
         $id   = $matches[1];
         $dest = imageCreateTruecolor($s[$size], $s[$size]);
 
-        if (file_exists('/uploads/avatars/'.$id.'.jpg'))
+        if (file_exists('uploads/avatars/'.$id.'.jpg'))
         {
             $offsetX = $offsetY = 0;
 
@@ -1167,7 +1167,7 @@ class AjaxHandler
         foreach ($ids as $id)
         {
             // must not be already approved
-            if ($_ = DB::Aowow()->selectCell('SELECT uploader FROM ?_screenshots WHERE (status & ?d) = 0 AND id = ?d', CC_FLAG_APPROVED, $id))
+            if ($_ = DB::Aowow()->selectCell('SELECT userIdOwner FROM ?_screenshots WHERE (status & ?d) = 0 AND id = ?d', CC_FLAG_APPROVED, $id))
             {
                 // should also error-log
                 if (!file_exists(sprintf($path, 'pending', $id)))
@@ -1208,7 +1208,7 @@ class AjaxHandler
                 rename(sprintf($path, 'pending', $id), sprintf($path, 'normal', $id));
 
                 // set as approved in DB and gain rep (once!)
-                DB::Aowow()->query('UPDATE ?_screenshots SET status = ?d, approvedBy = ?d WHERE id = ?d', CC_FLAG_APPROVED, User::$id, $id);
+                DB::Aowow()->query('UPDATE ?_screenshots SET status = ?d, userIdApprove = ?d WHERE id = ?d', CC_FLAG_APPROVED, User::$id, $id);
                 Util::gainSiteReputation($_, SITEREP_ACTION_UPLOAD, ['id' => $id, 'what' => 1]);
             }
         }
@@ -1279,7 +1279,7 @@ class AjaxHandler
         }
 
         // flag as deleted if not aready
-        DB::Aowow()->query('UPDATE ?_screenshots SET status = ?d, deletedBy = ?d WHERE id IN (?a)', CC_FLAG_DELETED, User::$id, $ids);
+        DB::Aowow()->query('UPDATE ?_screenshots SET status = ?d, userIdDelete = ?d WHERE id IN (?a)', CC_FLAG_DELETED, User::$id, $ids);
 
         return '';
     }
diff --git a/includes/community.class.php b/includes/community.class.php
index 62ffa21c..33457b14 100644
--- a/includes/community.class.php
+++ b/includes/community.class.php
@@ -237,14 +237,14 @@ class CommunityContent
     public static function getScreenshotsForManager($type, $typeId, $userId = 0)
     {
         $screenshots = DB::Aowow()->select('
-            SELECT s.id, a.displayName AS user, s.date, s.width, s.height, s.type, s.typeId, s.caption, s.status, s.status AS "flags"
-            FROM   ?_screenshots s, ?_account a
+            SELECT    s.id, a.displayName AS user, s.date, s.width, s.height, s.type, s.typeId, s.caption, s.status, s.status AS "flags"
+            FROM      ?_screenshots s,
+            LEFT JOIN ?_account a ON s.userIdOwner = a.id
             WHERE
-                   s.uploader = a.id AND
-                   { s.type = ?d}
-                   { AND s.typeId = ?d}
-                   { s.uploader = ?d}
-            LIMIT 100',
+                    { s.type = ?d}
+                    { AND s.typeId = ?d}
+                    { s.userIdOwner = ?d}
+            LIMIT     100',
             $userId ? DBSIMPLE_SKIP : $type,
             $userId ? DBSIMPLE_SKIP : $typeId,
             $userId ? $userId : DBSIMPLE_SKIP
@@ -296,6 +296,9 @@ class CommunityContent
             // something todo with massSelect .. am i doing this right?
             if ($num[$s['type']][$s['typeId']] == 1)
                 $s['unique'] = 1;
+
+            if (!$s['user'])
+                unset($s['user']);
         }
 
         return $screenshots;
@@ -418,8 +421,9 @@ class CommunityContent
     {
         $videos = DB::Aowow()->selectPage($nFound, "
             SELECT v.id, a.displayName AS user, v.date, v.videoId, v.caption, IF(v.status & ?d, 1, 0) AS 'sticky', v.type, v.typeId
-            FROM ?_videos v, ?_account a
-            WHERE {v.uploader = ?d }{v.type = ? }{AND v.typeId = ? }AND v.status & ?d AND (v.status & ?d) = 0 AND v.uploader = a.id",
+            FROM ?_videos v
+            LEFT JOIN ?_account a ON v.userIdOwner = a.id
+            WHERE {v.userIdOwner = ?d }{v.type = ? }{AND v.typeId = ? }AND v.status & ?d AND (v.status & ?d) = 0",
             CC_FLAG_STICKY,
             $typeOrUser < 0 ? -$typeOrUser : DBSIMPLE_SKIP,
             $typeOrUser > 0 ?  $typeOrUser : DBSIMPLE_SKIP,
@@ -449,8 +453,12 @@ class CommunityContent
 
             $v['date']      = date(Util::$dateFormatInternal, $v['date']);
             $v['videoType'] = 1;            // always youtube
+
             if (!$v['sticky'])
                 unset($v['sticky']);
+
+            if (!$v['user'])
+                unset($v['user']);
         }
 
         return $videos;
@@ -460,8 +468,9 @@ class CommunityContent
     {
         $screenshots = DB::Aowow()->selectPage($nFound, "
             SELECT s.id, a.displayName AS user, s.date, s.width, s.height, s.caption, IF(s.status & ?d, 1, 0) AS 'sticky', s.type, s.typeId
-            FROM ?_screenshots s, ?_account a
-            WHERE {s.uploader = ?d }{s.type = ? }{AND s.typeId = ? }AND s.status & ?d AND (s.status & ?d) = 0 AND s.uploader = a.id",
+            FROM ?_screenshots s
+            LEFT JOIN ?_account a ON s.userIdOwner = a.id
+            WHERE {s.userIdOwner = ?d }{s.type = ? }{AND s.typeId = ? }AND s.status & ?d AND (s.status & ?d) = 0",
             CC_FLAG_STICKY,
             $typeOrUser < 0 ? -$typeOrUser : DBSIMPLE_SKIP,
             $typeOrUser > 0 ?  $typeOrUser : DBSIMPLE_SKIP,
@@ -490,8 +499,12 @@ class CommunityContent
             }
 
             $s['date'] = date(Util::$dateFormatInternal, $s['date']);
+
             if (!$s['sticky'])
                 unset($s['sticky']);
+
+            if (!$s['user'])
+                unset($s['user']);
         }
 
         return $screenshots;
diff --git a/includes/user.class.php b/includes/user.class.php
index 525277df..7404706b 100644
--- a/includes/user.class.php
+++ b/includes/user.class.php
@@ -525,7 +525,7 @@ class User
     {
         $data = [];
 
-        $res = DB::Aowow()->select('SELECT * FROM ?_account_weightscales WHERE account = ?d', self::$id);
+        $res = DB::Aowow()->select('SELECT * FROM ?_account_weightscales WHERE userId = ?d', self::$id);
         foreach ($res as $i)
         {
             $set = array (
diff --git a/pages/screenshot.php b/pages/screenshot.php
index 7016b1c7..fda12f7b 100644
--- a/pages/screenshot.php
+++ b/pages/screenshot.php
@@ -104,7 +104,7 @@ class ScreenshotPage extends GenericPage
 
         // write to db
         $newId = DB::Aowow()->query(
-            'INSERT INTO ?_screenshots (type, typeId, uploader, date, width, height, caption) VALUES (?d, ?d, ?d, UNIX_TIMESTAMP(), ?d, ?d, ?)',
+            'INSERT INTO ?_screenshots (type, typeId, userIdOwner, date, width, height, caption) VALUES (?d, ?d, ?d, UNIX_TIMESTAMP(), ?d, ?d, ?)',
             $_SESSION['ssUpload']['type'], $_SESSION['ssUpload']['typeId'],
             User::$id,
             $w, $h,
diff --git a/pages/user.php b/pages/user.php
index dd701568..f60bf9e8 100644
--- a/pages/user.php
+++ b/pages/user.php
@@ -61,7 +61,7 @@ class UserPage extends GenericPage
         if ($co['sum'])
             $contrib[] = Lang::user('comments').Lang::main('colon').$co['sum'].' [small]([tooltip=tooltip_totalratings]'.$co['nRates'].'[/tooltip])[/small]';
 
-        $ss = DB::Aowow()->selectRow('SELECT COUNT(id) AS sum, SUM(IF(status & ?d, 1, 0)) as nSticky FROM ?_screenshots WHERE uploader = ?d AND status & ?d AND (status & ?d) = 0',
+        $ss = DB::Aowow()->selectRow('SELECT COUNT(id) AS sum, SUM(IF(status & ?d, 1, 0)) as nSticky FROM ?_screenshots WHERE userIdOwner = ?d AND status & ?d AND (status & ?d) = 0',
             CC_FLAG_STICKY,
             $this->user['id'],
             CC_FLAG_APPROVED,
@@ -70,7 +70,7 @@ class UserPage extends GenericPage
         if ($ss['sum'])
             $contrib[] = Lang::user('screenshots').Lang::main('colon').$ss['sum'].' [small]([tooltip=tooltip_normal]'.($ss['sum'] - $ss['nSticky']).'[/tooltip] + [tooltip=tooltip_sticky]'.$ss['nSticky'].'[/tooltip])[/small]';
 
-        $vi = DB::Aowow()->selectRow('SELECT COUNT(id) AS sum, SUM(IF(status & ?d, 1, 0)) as nSticky FROM ?_videos WHERE uploader = ?d AND status & ?d AND (status & ?d) = 0',
+        $vi = DB::Aowow()->selectRow('SELECT COUNT(id) AS sum, SUM(IF(status & ?d, 1, 0)) as nSticky FROM ?_videos WHERE userIdOwner = ?d AND status & ?d AND (status & ?d) = 0',
             CC_FLAG_STICKY,
             $this->user['id'],
             CC_FLAG_APPROVED,
diff --git a/setup/updates/1433793600_01.sql b/setup/updates/1433793600_01.sql
new file mode 100644
index 00000000..eb2cf7d8
--- /dev/null
+++ b/setup/updates/1433793600_01.sql
@@ -0,0 +1,79 @@
+-- ***************************
+-- * change engine to InnoDB *
+-- * unify userId-fields     *
+-- ***************************
+
+ALTER TABLE `aowow_account`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT;
+
+ALTER TABLE `aowow_account_banned`
+	ALTER `userId` DROP DEFAULT,
+	ALTER `staffId` DROP DEFAULT;
+ALTER TABLE `aowow_account_banned`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT,
+	CHANGE COLUMN `userId` `userId` INT(10) UNSIGNED NOT NULL COMMENT 'affected accountId' AFTER `id`,
+	CHANGE COLUMN `staffId` `staffId` INT(10) UNSIGNED NOT NULL COMMENT 'executive accountId' AFTER `userId`;
+
+ALTER TABLE `aowow_account_cookies`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT;
+
+ALTER TABLE `aowow_account_reputation`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT;
+
+ALTER TABLE `aowow_account_weightscales`
+	ALTER `account` DROP DEFAULT;
+ALTER TABLE `aowow_account_weightscales`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT,
+	CHANGE COLUMN `account` `userId` INT(10) UNSIGNED NOT NULL AFTER `id`;
+
+ALTER TABLE `aowow_screenshots`
+	ALTER `uploader` DROP DEFAULT;
+ALTER TABLE `aowow_screenshots`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT,
+	CHANGE COLUMN `uploader` `userIdOwner` INT(10) UNSIGNED NULL AFTER `typeId`,
+	CHANGE COLUMN `approvedBy` `userIdApprove` INT(10) UNSIGNED NULL DEFAULT NULL AFTER `status`,
+	CHANGE COLUMN `deletedBy` `userIdDelete` INT(10) UNSIGNED NULL DEFAULT NULL AFTER `userIdApprove`;
+
+ALTER TABLE `aowow_videos`
+	ALTER `uploader` DROP DEFAULT;
+ALTER TABLE `aowow_videos`
+	ENGINE=InnoDB,
+	ROW_FORMAT=COMPACT,
+	CHANGE COLUMN `uploader` `userIdOwner` INT(10) UNSIGNED NULL AFTER `typeId`,
+	CHANGE COLUMN `approvedBy` `userIdApprove` INT(10) UNSIGNED NULL DEFAULT NULL AFTER `status`,
+	ADD COLUMN `userIdeDelete` INT(10) UNSIGNED NULL DEFAULT NULL AFTER `userIdApprove`;
+
+-- **********************
+-- * apply foreign keys *
+-- **********************
+
+ALTER TABLE aowow_account_cookies ADD CONSTRAINT FK_acc_cookies FOREIGN KEY (userId) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE CASCADE
+;
+ALTER TABLE aowow_account_banned ADD CONSTRAINT FK_acc_banned FOREIGN KEY (userId) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE CASCADE
+;
+ALTER TABLE aowow_account_reputation ADD CONSTRAINT FK_acc_rep FOREIGN KEY (userId) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE CASCADE
+;
+ALTER TABLE aowow_account_weightscales ADD CONSTRAINT FK_acc_weights FOREIGN KEY (userId) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE CASCADE
+;
+ALTER TABLE aowow_screenshots ADD CONSTRAINT FK_acc_ss FOREIGN KEY (userIdOwner) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE SET NULL
+;
+ALTER TABLE aowow_videos ADD CONSTRAINT FK_acc_vi FOREIGN KEY (userIdOwner) REFERENCES aowow_account(id)
+    ON UPDATE CASCADE
+    ON DELETE SET NULL
+;