diff --git a/CHANGELOG b/CHANGELOG
index ce4bc96..21ee2e8 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,10 @@
+Version 0.8.2 (????-??-??)
+==========================
+
+Bug fixes:
+- Enforce foreign key constraints in MySQL
+- Widen most text fields for MySQL
+
 Version 0.8.1 (2019-10-28)
 ==========================
 
diff --git a/UPGRADING b/UPGRADING
index c96f41c..a78867b 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -10,6 +10,14 @@ usually prudent:
 - If installing from source, update dependencies with:
   `composer install -o --no-dev`
 
+
+Upgrading from 0.8.1 to 0.8.2
+=============================
+
+- The database schema has changed from rev5 to rev6; if upgrading the database
+  manually, apply the 5.sql file
+
+
 Upgrading from 0.7.1 to 0.8.0
 =============================
 
@@ -22,6 +30,7 @@ Upgrading from 0.7.1 to 0.8.0
     - zendframework/zend-diactoros (version 2.x)
     - zendframework/zend-httphandlerrunner
 
+
 Upgrading from 0.5.1 to 0.6.0
 =============================
 
diff --git a/lib/Database.php b/lib/Database.php
index 4036f91..bcca3eb 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -39,7 +39,7 @@ use JKingWeb\Arsse\Misc\URL;
  */
 class Database {
     /** The version number of the latest schema the interface is aware of */
-    const SCHEMA_VERSION = 5;
+    const SCHEMA_VERSION = 6;
     /** The size of a set of values beyond which the set will be embedded into the query text */
     const LIMIT_SET_SIZE = 25;
     /** The length of a string in an embedded set beyond which a parameter placeholder will be used for the string */
@@ -50,7 +50,7 @@ class Database {
     const ASSOC_ADD = 1;
     /** Makes tag/label association change operations replace members */
     const ASSOC_REPLACE = 2;
-    /** A map database driver short-names and their associated class names */
+    /** A map of database driver short-names and their associated class names */
     const DRIVER_NAMES = [
         'sqlite3'    => \JKingWeb\Arsse\Db\SQLite3\Driver::class,
         'postgresql' => \JKingWeb\Arsse\Db\PostgreSQL\Driver::class,
@@ -520,7 +520,7 @@ class Database {
         if (!ValueInfo::id($id)) {
             throw new Db\ExceptionInput("typeViolation", ["action" => __FUNCTION__, "field" => "folder", 'type' => "int > 0"]);
         }
-        $changes = $this->db->prepare("WITH RECURSIVE folders(folder) as (SELECT ? union select id from arsse_folders join folders on parent = folder) DELETE FROM arsse_folders where owner = ? and id in (select folder from folders)", "int", "str")->run($id, $user)->changes();
+        $changes = $this->db->prepare("DELETE FROM arsse_folders where owner = ? and id = ?", "str", "int")->run($user, $id)->changes();
         if (!$changes) {
             throw new Db\ExceptionInput("subjectMissing", ["action" => __FUNCTION__, "field" => "folder", 'id' => $id]);
         }
diff --git a/lib/Db/PostgreSQL/Driver.php b/lib/Db/PostgreSQL/Driver.php
index d1ed558..94497dd 100644
--- a/lib/Db/PostgreSQL/Driver.php
+++ b/lib/Db/PostgreSQL/Driver.php
@@ -185,7 +185,7 @@ class Driver extends \JKingWeb\Arsse\Db\AbstractDriver {
         $dsn = $this->makeconnectionString(false, $user, $pass, $db, $host, $port, $service);
         set_error_handler(function(int $code, string $msg) {
             $msg = substr($msg, 62);
-            throw new Exception("connectionFailure", ["PostgreSQL", $msg]);
+            throw new Exception("connectionFailure", ['engine' => "PostgreSQL", 'message' => $msg]);
         });
         try {
             $this->db = pg_connect($dsn, \PGSQL_CONNECT_FORCE_NEW);
diff --git a/sql/MySQL/5.sql b/sql/MySQL/5.sql
new file mode 100644
index 0000000..06697be
--- /dev/null
+++ b/sql/MySQL/5.sql
@@ -0,0 +1,133 @@
+-- SPDX-License-Identifier: MIT
+-- Copyright 2017 J. King, Dustin Wilson et al.
+-- See LICENSE and AUTHORS files for details
+
+-- Drop unnecessary indexes
+drop index id on arsse_folders;
+drop index id on arsse_feeds;
+drop index id on arsse_subscriptions;
+drop index id on arsse_articles;
+drop index id on arsse_editions;
+drop index id on arsse_labels;
+drop index id on arsse_tags;
+
+-- Ensure tables use dynamic row-format; these should be no-ops for most installations
+alter table arsse_meta engine=InnoDB row_format=dynamic;
+alter table arsse_users engine=InnoDB row_format=dynamic;
+alter table arsse_feeds engine=InnoDB row_format=dynamic;
+alter table arsse_folders engine=InnoDB row_format=dynamic;
+alter table arsse_subscriptions engine=InnoDB row_format=dynamic;
+alter table arsse_articles engine=InnoDB row_format=dynamic;
+alter table arsse_marks engine=InnoDB row_format=dynamic;
+alter table arsse_labels engine=InnoDB row_format=dynamic;
+alter table arsse_label_members engine=InnoDB row_format=dynamic;
+alter table arsse_tags engine=InnoDB row_format=dynamic;
+alter table arsse_tag_members engine=InnoDB row_format=dynamic;
+alter table arsse_editions engine=InnoDB row_format=dynamic;
+alter table arsse_categories engine=InnoDB row_format=dynamic;
+alter table arsse_tokens engine=InnoDB row_format=dynamic;
+alter table arsse_sessions engine=InnoDB row_format=dynamic;
+
+-- Correct character set and collation of sessions table
+alter table arsse_sessions default character set utf8mb4 collate utf8mb4_unicode_ci;
+alter table arsse_sessions convert to character set utf8mb4 collate utf8mb4_unicode_ci;
+
+-- Ensure referential integrity
+with valid as (select id from arsse_folders)
+    delete from arsse_folders where
+        owner not in (select id from arsse_users) or
+        (parent is not null and parent not in (select id from valid));
+delete from arsse_subscriptions where
+    owner not in (select id from arsse_users) or
+    feed not in (select id from arsse_feeds) or
+    (folder is not null and folder not in (select id from arsse_folders));
+delete from arsse_articles where feed not in (select id from arsse_feeds);
+delete from arsse_enclosures where article not in (select id from arsse_articles);
+delete from arsse_marks where
+    article not in (select id from arsse_articles) or
+    subscription not in (select id from arsse_subscriptions);
+delete from arsse_editions where article not in (select id from arsse_articles);
+delete from arsse_categories where article not in (select id from arsse_articles);
+delete from arsse_sessions where "user" not in (select id from arsse_users);
+delete from arsse_labels where owner not in (select id from arsse_users);
+delete from arsse_label_members where
+    label not in (select id from arsse_labels) or
+    article not in (select id from arsse_articles) or
+    subscription not in (select id from arsse_subscriptions);
+delete from arsse_tags where owner not in (select id from arsse_users);
+delete from arsse_tag_members where
+    tag not in (select id from arsse_tags) or
+    subscription not in (select id from arsse_subscriptions);
+delete from arsse_tokens where "user" not in (select id from arsse_users);
+
+-- Make integer foreign key referrers unsigned to match serial-type keys
+alter table arsse_folders modify parent bigint unsigned;
+alter table arsse_subscriptions modify feed bigint unsigned not null;
+alter table arsse_subscriptions modify folder bigint unsigned;
+alter table arsse_articles modify feed bigint unsigned not null;
+alter table arsse_enclosures modify article bigint unsigned not null;
+alter table arsse_marks modify article bigint unsigned not null;
+alter table arsse_marks modify subscription bigint unsigned not null;
+alter table arsse_editions modify article bigint unsigned not null;
+alter table arsse_categories modify article bigint unsigned not null;
+alter table arsse_label_members modify label bigint unsigned not null;
+alter table arsse_label_members modify article bigint unsigned not null;
+alter table arsse_label_members modify subscription bigint unsigned not null;
+alter table arsse_tag_members modify tag bigint unsigned not null;
+alter table arsse_tag_members modify subscription bigint unsigned not null;
+
+-- Use longtext columns whenever possible
+alter table arsse_users modify password longtext;
+alter table arsse_sessions drop primary key;
+alter table arsse_sessions modify id longtext;
+alter table arsse_sessions add primary key(id(768));
+alter table arsse_tokens drop primary key;
+alter table arsse_tokens modify id longtext;
+alter table arsse_tokens add primary key(id(512), class);
+drop index url on arsse_feeds;
+alter table arsse_feeds modify url longtext not null;
+alter table arsse_feeds add unique index(url(255), username, password);
+alter table arsse_feeds modify title longtext;
+alter table arsse_feeds modify favicon longtext;
+alter table arsse_feeds modify source longtext;
+alter table arsse_feeds modify err_msg longtext;
+alter table arsse_articles modify url longtext;
+alter table arsse_articles modify title longtext;
+alter table arsse_articles modify author longtext;
+alter table arsse_articles modify guid longtext;
+alter table arsse_enclosures modify url longtext;
+alter table arsse_enclosures modify type longtext;
+alter table arsse_categories modify name longtext;
+drop index owner on arsse_folders;
+alter table arsse_folders modify name longtext not null;
+alter table arsse_folders add unique index(owner, name(255), parent);
+drop index owner on arsse_tags;
+alter table arsse_tags modify name longtext not null;
+alter table arsse_tags add unique index(owner, name(255));
+drop index owner on arsse_labels;
+alter table arsse_labels modify name longtext not null;
+alter table arsse_labels add unique index(owner, name(255));
+
+-- Fix foreign key constraints
+alter table arsse_folders add foreign key(owner) references arsse_users(id) on delete cascade on update cascade;
+alter table arsse_folders add foreign key(parent) references arsse_folders(id) on delete cascade;
+alter table arsse_subscriptions add foreign key(owner) references arsse_users(id) on delete cascade on update cascade;
+alter table arsse_subscriptions add foreign key(feed) references arsse_feeds(id) on delete cascade;
+alter table arsse_subscriptions add foreign key(folder) references arsse_folders(id) on delete cascade;
+alter table arsse_articles add foreign key(feed) references arsse_feeds(id) on delete cascade;
+alter table arsse_enclosures add foreign key(article) references arsse_articles(id) on delete cascade;
+alter table arsse_marks add foreign key(article) references arsse_articles(id) on delete cascade;
+alter table arsse_marks add foreign key(subscription) references arsse_subscriptions(id) on delete cascade;
+alter table arsse_editions add foreign key(article) references arsse_articles(id) on delete cascade;
+alter table arsse_categories add foreign key(article) references arsse_articles(id) on delete cascade;
+alter table arsse_sessions add foreign key("user") references arsse_users(id) on delete cascade on update cascade;
+alter table arsse_labels add foreign key(owner) references arsse_users(id) on delete cascade on update cascade;
+alter table arsse_label_members add foreign key(label) references arsse_labels(id) on delete cascade;
+alter table arsse_label_members add foreign key(article) references arsse_articles(id) on delete cascade;
+alter table arsse_label_members add foreign key(subscription) references arsse_subscriptions(id) on delete cascade;
+alter table arsse_tags add foreign key(owner) references arsse_users(id) on delete cascade on update cascade;
+alter table arsse_tag_members add foreign key(tag) references arsse_tags(id) on delete cascade;
+alter table arsse_tag_members add foreign key(subscription) references arsse_subscriptions(id) on delete cascade;
+alter table arsse_tokens add foreign key("user") references arsse_users(id) on delete cascade on update cascade;
+
+update arsse_meta set value = '6' where "key" = 'schema_version';
diff --git a/sql/PostgreSQL/5.sql b/sql/PostgreSQL/5.sql
new file mode 100644
index 0000000..5e96fb4
--- /dev/null
+++ b/sql/PostgreSQL/5.sql
@@ -0,0 +1,8 @@
+-- SPDX-License-Identifier: MIT
+-- Copyright 2017 J. King, Dustin Wilson et al.
+-- See LICENSE and AUTHORS files for details
+
+-- This schema version strictly applies fixes for MySQL, 
+-- hence this file is functionally empty
+
+update arsse_meta set value = '6' where "key" = 'schema_version';
diff --git a/sql/SQLite3/5.sql b/sql/SQLite3/5.sql
new file mode 100644
index 0000000..942e9a6
--- /dev/null
+++ b/sql/SQLite3/5.sql
@@ -0,0 +1,10 @@
+-- SPDX-License-Identifier: MIT
+-- Copyright 2017 J. King, Dustin Wilson et al.
+-- See LICENSE and AUTHORS files for details
+
+-- This schema version strictly applies fixes for MySQL, 
+-- hence this file is functionally empty
+
+-- set version marker
+pragma user_version = 6;
+update arsse_meta set value = '6' where "key" = 'schema_version';
diff --git a/tests/lib/DatabaseDrivers/MySQL.php b/tests/lib/DatabaseDrivers/MySQL.php
index 048266d..332f3d9 100644
--- a/tests/lib/DatabaseDrivers/MySQL.php
+++ b/tests/lib/DatabaseDrivers/MySQL.php
@@ -48,6 +48,7 @@ trait MySQL {
             $db->query("UNLOCK TABLES; ROLLBACK");
         } catch (\Throwable $e) {
         }
+        $db->query("SET FOREIGN_KEY_CHECKS=0");
         foreach (self::dbTableList($db) as $table) {
             if ($table === "arsse_meta") {
                 $db->query("DELETE FROM $table where `key` <> 'schema_version'");
@@ -56,6 +57,7 @@ trait MySQL {
             }
             $db->query("ALTER TABLE $table auto_increment = 1");
         }
+        $db->query("SET FOREIGN_KEY_CHECKS=1");
         foreach ($afterStatements as $st) {
             $db->query($st);
         }
@@ -67,9 +69,11 @@ trait MySQL {
             $db->query("UNLOCK TABLES; ROLLBACK");
         } catch (\Throwable $e) {
         }
+        $db->query("SET FOREIGN_KEY_CHECKS=0");
         foreach (self::dbTableList($db) as $table) {
             $db->query("DROP TABLE IF EXISTS $table");
         }
+        $db->query("SET FOREIGN_KEY_CHECKS=1");
         foreach ($afterStatements as $st) {
             $db->query($st);
         }