diff --git a/lib/Database.php b/lib/Database.php
index 95ccc611..343e2cec 100644
--- a/lib/Database.php
+++ b/lib/Database.php
@@ -762,6 +762,7 @@ class Database {
         // validate inputs
         $folder = $this->folderValidateId($user, $folder)['id'];
         // create a complex query
+        $integer = $this->db->sqlToken("integer");
         $q = new Query(
             "SELECT
                 s.id as id,
@@ -789,7 +790,7 @@ class Database {
                     select 
                         subscription, 
                         sum(hidden) as hidden,
-                        sum(cast((\"read\" = 1 and hidden = 0) as integer)) as marked
+                        sum(cast((\"read\" = 1 and hidden = 0) as $integer)) as marked
                     from arsse_marks group by subscription
                 ) as mark_stats on mark_stats.subscription = s.id"
         );
@@ -1211,7 +1212,7 @@ class Database {
      * - "block": The block rule; any article which matches this rule are hidden
      */
     public function feedRulesGet(int $feedID): Db\Result {
-        return $this->db->prepare("SELECT owner, coalesce(keep_rule, '') as keep, coalesce(block_rule, '') as block from arsse_subscriptions where feed = ? and (keep || block) <> '' order by owner", "int")->run($feedID);
+        return $this->db->prepare("SELECT owner, coalesce(keep_rule, '') as keep, coalesce(block_rule, '') as block from arsse_subscriptions where feed = ? and (coalesce(keep_rule, '') || coalesce(block_rule, '')) <> '' order by owner", "int")->run($feedID);
     }
 
     /** Retrieves various identifiers for the latest $count articles in the given newsfeed. The identifiers are:
@@ -1803,6 +1804,7 @@ class Database {
 
     /** Deletes from the database articles which are beyond the configured clean-up threshold */
     public function articleCleanup(): bool {
+        $integer = $this->db->sqlToken("integer");
         $query = $this->db->prepareArray(
             "WITH RECURSIVE
             exempt_articles as (
@@ -1828,8 +1830,8 @@ class Database {
                 left join (
                     select 
                         article, 
-                        sum(cast((starred = 1 and hidden = 0) as integer)) as starred, 
-                        sum(cast((\"read\" = 1 or hidden = 1) as integer)) as \"read\", 
+                        sum(cast((starred = 1 and hidden = 0) as $integer)) as starred, 
+                        sum(cast((\"read\" = 1 or hidden = 1) as $integer)) as \"read\", 
                         max(arsse_marks.modified) as marked_date 
                     from arsse_marks 
                     group by article
@@ -1960,6 +1962,7 @@ class Database {
      * @param boolean $includeEmpty Whether to include (true) or supress (false) labels which have no articles assigned to them
      */
     public function labelList(string $user, bool $includeEmpty = true): Db\Result {
+        $integer = $this->db->sqlToken("integer");
         return $this->db->prepareArray(
             "SELECT * FROM (
                 SELECT
@@ -1975,7 +1978,7 @@ class Database {
                         SELECT
                             label,
                             sum(hidden) as hidden,
-                            sum(cast((\"read\" = 1 and hidden = 0) as integer)) as marked
+                            sum(cast((\"read\" = 1 and hidden = 0) as $integer)) as marked
                         from arsse_marks
                             join arsse_subscriptions on arsse_subscriptions.id = arsse_marks.subscription
                             join arsse_label_members on arsse_label_members.article = arsse_marks.article
@@ -2025,6 +2028,7 @@ class Database {
         $this->labelValidateId($user, $id, $byName, false);
         $field = $byName ? "name" : "id";
         $type = $byName ? "str" : "int";
+        $integer = $this->db->sqlToken("integer");
         $out = $this->db->prepareArray(
             "SELECT
                 id,
@@ -2039,7 +2043,7 @@ class Database {
                     SELECT
                         label,
                         sum(hidden) as hidden,
-                        sum(cast((\"read\" = 1 and hidden = 0) as integer)) as marked
+                        sum(cast((\"read\" = 1 and hidden = 0) as $integer)) as marked
                     from arsse_marks
                     join arsse_subscriptions on arsse_subscriptions.id = arsse_marks.subscription
                     join arsse_label_members on arsse_label_members.article = arsse_marks.article
diff --git a/lib/Db/Driver.php b/lib/Db/Driver.php
index 1488b1b1..d533b926 100644
--- a/lib/Db/Driver.php
+++ b/lib/Db/Driver.php
@@ -74,6 +74,7 @@ interface Driver {
      * - "greatest": the GREATEST function implemented by PostgreSQL and MySQL
      * - "nocase": the name of a general-purpose case-insensitive collation sequence
      * - "like": the case-insensitive LIKE operator
+     * - "integer": the integer type to use for explicit casts
      */
     public function sqlToken(string $token): string;
 
diff --git a/lib/Db/MySQL/Driver.php b/lib/Db/MySQL/Driver.php
index 023a2819..8a82be44 100644
--- a/lib/Db/MySQL/Driver.php
+++ b/lib/Db/MySQL/Driver.php
@@ -81,6 +81,8 @@ class Driver extends \JKingWeb\Arsse\Db\AbstractDriver {
         switch (strtolower($token)) {
             case "nocase":
                 return '"utf8mb4_unicode_ci"';
+            case "integer":
+                return "signed integer";
             default:
                 return $token;
         }
diff --git a/tests/cases/Db/BaseDriver.php b/tests/cases/Db/BaseDriver.php
index 94091ac5..665443d3 100644
--- a/tests/cases/Db/BaseDriver.php
+++ b/tests/cases/Db/BaseDriver.php
@@ -90,13 +90,6 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
         $this->assertTrue($this->drv->charsetAcceptable());
     }
 
-    public function testTranslateAToken(): void {
-        $this->assertRegExp("/^[a-z][a-z0-9]*$/i", $this->drv->sqlToken("greatest"));
-        $this->assertRegExp("/^\"?[a-z][a-z0-9_\-]*\"?$/i", $this->drv->sqlToken("nocase"));
-        $this->assertRegExp("/^[a-z][a-z0-9]*$/i", $this->drv->sqlToken("like"));
-        $this->assertSame("distinct", $this->drv->sqlToken("distinct"));
-    }
-
     public function testExecAValidStatement(): void {
         $this->assertTrue($this->drv->exec($this->create));
     }
@@ -386,4 +379,18 @@ abstract class BaseDriver extends \JKingWeb\Arsse\Test\AbstractTest {
         // this performs maintenance in the absence of tables; see BaseUpdate.php for another test with tables
         $this->assertTrue($this->drv->maintenance());
     }
+
+    public function testTranslateTokens(): void {
+        $greatest = $this->drv->sqlToken("GrEatESt");
+        $nocase = $this->drv->sqlToken("noCASE");
+        $like = $this->drv->sqlToken("liKe");
+        $integer = $this->drv->sqlToken("InTEGer");
+
+        $this->assertSame("NOT_A_TOKEN", $this->drv->sqlToken("NOT_A_TOKEN"));
+
+        $this->assertSame("Z", $this->drv->query("SELECT $greatest('Z', 'A')")->getValue());
+        $this->assertSame("Z", $this->drv->query("SELECT 'Z' collate $nocase")->getValue());
+        $this->assertSame("Z", $this->drv->query("SELECT 'Z' where 'Z' $like 'z'")->getValue());
+        $this->assertEquals(1, $this->drv->query("SELECT CAST((1=1) as $integer)")->getValue());
+    }
 }