diff --git a/RoboFile.php b/RoboFile.php
index e957860..e73d3e4 100644
--- a/RoboFile.php
+++ b/RoboFile.php
@@ -107,7 +107,7 @@ class RoboFile extends \Robo\Tasks {
                 $set = ["--exclude-group", "optional,slow"];
                 break;
             case "coverage":
-                $set = ["--exclude-group", "optional,excludeFromCoverage"];
+                $set = ["--exclude-group", "optional,coverageOptional"];
                 break;
             case "full":
                 $set = [];
diff --git a/tests/cases/Db/PostgreSQL/TestCreation.php b/tests/cases/Db/PostgreSQL/TestCreation.php
index f9271d4..1abdf45 100644
--- a/tests/cases/Db/PostgreSQL/TestCreation.php
+++ b/tests/cases/Db/PostgreSQL/TestCreation.php
@@ -10,6 +10,7 @@ use JKingWeb\Arsse\Arsse;
 use JKingWeb\Arsse\Db\PostgreSQL\Driver;
 
 /**
+ * @group slow
  * @covers \JKingWeb\Arsse\Db\PostgreSQL\Driver<extended> */
 class TestCreation extends \JKingWeb\Arsse\Test\AbstractTest {
     /** @dataProvider provideConnectionStrings */
diff --git a/tests/cases/Db/PostgreSQL/TestDatabase.php b/tests/cases/Db/PostgreSQL/TestDatabase.php
index 8d748eb..7ea7fc8 100644
--- a/tests/cases/Db/PostgreSQL/TestDatabase.php
+++ b/tests/cases/Db/PostgreSQL/TestDatabase.php
@@ -7,7 +7,8 @@ declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\PosgreSQL;
 
 /**
- * @group excludeFromCoverage
+ * @group slow
+ * @group coverageOptional
  * @covers \JKingWeb\Arsse\Database<extended>
  * @covers \JKingWeb\Arsse\Misc\Query<extended>
  */
diff --git a/tests/cases/Db/PostgreSQL/TestDriver.php b/tests/cases/Db/PostgreSQL/TestDriver.php
index ae4c4b2..dadf9cb 100644
--- a/tests/cases/Db/PostgreSQL/TestDriver.php
+++ b/tests/cases/Db/PostgreSQL/TestDriver.php
@@ -7,6 +7,7 @@ declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\PostgreSQL;
 
 /**
+ * @group slow
  * @covers \JKingWeb\Arsse\Db\PostgreSQL\PDODriver<extended>
  * @covers \JKingWeb\Arsse\Db\PDODriver
  * @covers \JKingWeb\Arsse\Db\PDOError */
diff --git a/tests/cases/Db/PostgreSQL/TestResult.php b/tests/cases/Db/PostgreSQL/TestResult.php
index de0aca2..0d85bdd 100644
--- a/tests/cases/Db/PostgreSQL/TestResult.php
+++ b/tests/cases/Db/PostgreSQL/TestResult.php
@@ -9,6 +9,7 @@ namespace JKingWeb\Arsse\TestCase\Db\PostgreSQL;
 use JKingWeb\Arsse\Test\DatabaseInformation;
 
 /**
+ * @group slow
  * @covers \JKingWeb\Arsse\Db\PDOResult<extended>
  */
 class TestResult extends \JKingWeb\Arsse\TestCase\Db\BaseResult {
diff --git a/tests/cases/Db/PostgreSQL/TestStatement.php b/tests/cases/Db/PostgreSQL/TestStatement.php
index 4385fb4..ba56a58 100644
--- a/tests/cases/Db/PostgreSQL/TestStatement.php
+++ b/tests/cases/Db/PostgreSQL/TestStatement.php
@@ -7,6 +7,7 @@ declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\PostgreSQL;
 
 /**
+ * @group slow
  * @covers \JKingWeb\Arsse\Db\PostgreSQL\PDOStatement<extended>
  * @covers \JKingWeb\Arsse\Db\PDOError */
 class TestStatement extends \JKingWeb\Arsse\TestCase\Db\BaseStatement {
diff --git a/tests/cases/Db/PostgreSQL/TestUpdate.php b/tests/cases/Db/PostgreSQL/TestUpdate.php
index 62f9140..21bf120 100644
--- a/tests/cases/Db/PostgreSQL/TestUpdate.php
+++ b/tests/cases/Db/PostgreSQL/TestUpdate.php
@@ -7,6 +7,7 @@ declare(strict_types=1);
 namespace JKingWeb\Arsse\TestCase\Db\PostgreSQL;
 
 /**
+ * @group slow
  * @covers \JKingWeb\Arsse\Db\PostgreSQL\PDODriver<extended>
  * @covers \JKingWeb\Arsse\Db\PDOError */
 class TestUpdate extends \JKingWeb\Arsse\TestCase\Db\BaseUpdate {