diff --git a/analyzer-baseline.toml b/analyzer-baseline.toml
index 6a0f82f4..0e5464f9 100644
--- a/analyzer-baseline.toml
+++ b/analyzer-baseline.toml
@@ -1458,60 +1458,6 @@ code = "unhandled-thrown-type"
 message = 'Potentially unhandled exception `Psr\Container\NotFoundExceptionInterface` in `PhpDb\Container\AdapterInterfaceFactory::__invoke`.'
 count = 1
 
-[[issues]]
-file = "src/Exception/ExceptionInterface.php"
-code = "missing-api-or-internal"
-message = 'Interface `PhpDb\Exception\ExceptionInterface` is missing an `@api` or `@internal` annotation.'
-count = 1
-
-[[issues]]
-file = "src/Metadata/Exception/InvalidArgumentException.php"
-code = "class-must-be-final"
-message = 'Class `PhpDb\Metadata\Exception\InvalidArgumentException` should be declared `final`.'
-count = 1
-
-[[issues]]
-file = "src/Metadata/Exception/RuntimeException.php"
-code = "class-must-be-final"
-message = 'Class `PhpDb\Metadata\Exception\RuntimeException` should be declared `final`.'
-count = 1
-
-[[issues]]
-file = "src/Metadata/Object/ConstraintKeyObject.php"
-code = "missing-constant-type"
-message = "Class constant `FK_CASCADE` is missing a type hint."
-count = 1
-
-[[issues]]
-file = "src/Metadata/Object/ConstraintKeyObject.php"
-code = "missing-constant-type"
-message = "Class constant `FK_NO_ACTION` is missing a type hint."
-count = 1
-
-[[issues]]
-file = "src/Metadata/Object/ConstraintKeyObject.php"
-code = "missing-constant-type"
-message = "Class constant `FK_RESTRICT` is missing a type hint."
-count = 1
-
-[[issues]]
-file = "src/Metadata/Object/ConstraintKeyObject.php"
-code = "missing-constant-type"
-message = "Class constant `FK_SET_DEFAULT` is missing a type hint."
-count = 1
-
-[[issues]]
-file = "src/Metadata/Object/ConstraintKeyObject.php"
-code = "missing-constant-type"
-message = "Class constant `FK_SET_NULL` is missing a type hint."
-count = 1
-
-[[issues]]
-file = "src/Metadata/Source/AbstractSource.php"
-code = "missing-constant-type"
-message = "Class constant `DEFAULT_SCHEMA` is missing a type hint."
-count = 1
-
 [[issues]]
 file = "src/ResultSet/AbstractResultSet.php"
 code = "incompatible-return-type"
diff --git a/lint-baseline.toml b/lint-baseline.toml
index 82306798..3b2adff0 100644
--- a/lint-baseline.toml
+++ b/lint-baseline.toml
@@ -228,24 +228,6 @@ code = "no-isset"
 message = "Use of the `isset` construct."
 count = 1
 
-[[issues]]
-file = "src/Exception/InvalidArgumentException.php"
-code = "no-fully-qualified-global-class-like"
-message = "Fully-qualified class-like reference detected."
-count = 1
-
-[[issues]]
-file = "src/Exception/RuntimeException.php"
-code = "no-fully-qualified-global-class-like"
-message = "Fully-qualified class-like reference detected."
-count = 1
-
-[[issues]]
-file = "src/Exception/UnexpectedValueException.php"
-code = "no-fully-qualified-global-class-like"
-message = "Fully-qualified class-like reference detected."
-count = 1
-
 [[issues]]
 file = "src/ResultSet/AbstractResultSet.php"
 code = "cyclomatic-complexity"
diff --git a/src/Exception/ExceptionInterface.php b/src/Exception/ExceptionInterface.php
index 5aac64ea..c3376717 100644
--- a/src/Exception/ExceptionInterface.php
+++ b/src/Exception/ExceptionInterface.php
@@ -6,5 +6,9 @@
 
 use Throwable;
 
-/** Marker for every exception this package throws. */
+/**
+ * Marker for every exception this package throws.
+ *
+ * @api
+ */
 interface ExceptionInterface extends Throwable {}
diff --git a/src/Exception/InvalidArgumentException.php b/src/Exception/InvalidArgumentException.php
index dfd9f705..f828615d 100644
--- a/src/Exception/InvalidArgumentException.php
+++ b/src/Exception/InvalidArgumentException.php
@@ -4,4 +4,6 @@
 
 namespace PhpDb\Exception;
 
-class InvalidArgumentException extends \InvalidArgumentException implements ExceptionInterface {}
+use InvalidArgumentException as BaseInvalidArgumentException;
+
+class InvalidArgumentException extends BaseInvalidArgumentException implements ExceptionInterface {}
diff --git a/src/Exception/RuntimeException.php b/src/Exception/RuntimeException.php
index 76060619..50cac487 100644
--- a/src/Exception/RuntimeException.php
+++ b/src/Exception/RuntimeException.php
@@ -4,4 +4,6 @@
 
 namespace PhpDb\Exception;
 
-class RuntimeException extends \RuntimeException implements ExceptionInterface {}
+use RuntimeException as BaseRuntimeException;
+
+class RuntimeException extends BaseRuntimeException implements ExceptionInterface {}
diff --git a/src/Exception/UnexpectedValueException.php b/src/Exception/UnexpectedValueException.php
index c281897b..578534f8 100644
--- a/src/Exception/UnexpectedValueException.php
+++ b/src/Exception/UnexpectedValueException.php
@@ -4,4 +4,6 @@
 
 namespace PhpDb\Exception;
 
-class UnexpectedValueException extends \UnexpectedValueException implements ExceptionInterface {}
+use UnexpectedValueException as BaseUnexpectedValueException;
+
+class UnexpectedValueException extends BaseUnexpectedValueException implements ExceptionInterface {}
diff --git a/src/Metadata/Exception/InvalidArgumentException.php b/src/Metadata/Exception/InvalidArgumentException.php
index 6fdac4db..4a97d1e8 100644
--- a/src/Metadata/Exception/InvalidArgumentException.php
+++ b/src/Metadata/Exception/InvalidArgumentException.php
@@ -6,4 +6,4 @@
 
 use PhpDb\Exception;
 
-class InvalidArgumentException extends Exception\InvalidArgumentException {}
+final class InvalidArgumentException extends Exception\InvalidArgumentException {}
diff --git a/src/Metadata/Exception/RuntimeException.php b/src/Metadata/Exception/RuntimeException.php
index b814fb3e..b05595d8 100644
--- a/src/Metadata/Exception/RuntimeException.php
+++ b/src/Metadata/Exception/RuntimeException.php
@@ -8,7 +8,7 @@
 
 use function sprintf;
 
-class RuntimeException extends Exception\RuntimeException
+final class RuntimeException extends Exception\RuntimeException
 {
     final public const string UNKNOWN_COLUMN = 'A column by that name was not found.';
 
diff --git a/src/Metadata/Object/ConstraintKeyObject.php b/src/Metadata/Object/ConstraintKeyObject.php
index 973e3de3..191ad709 100644
--- a/src/Metadata/Object/ConstraintKeyObject.php
+++ b/src/Metadata/Object/ConstraintKeyObject.php
@@ -6,15 +6,15 @@
 
 final class ConstraintKeyObject
 {
-    final public const FK_CASCADE = 'CASCADE';
+    final public const string FK_CASCADE = 'CASCADE';
 
-    final public const FK_SET_NULL = 'SET NULL';
+    final public const string FK_SET_NULL = 'SET NULL';
 
-    final public const FK_NO_ACTION = 'NO ACTION';
+    final public const string FK_NO_ACTION = 'NO ACTION';
 
-    final public const FK_RESTRICT = 'RESTRICT';
+    final public const string FK_RESTRICT = 'RESTRICT';
 
-    final public const FK_SET_DEFAULT = 'SET DEFAULT';
+    final public const string FK_SET_DEFAULT = 'SET DEFAULT';
 
     private ?int $ordinalPosition = null;
 
diff --git a/src/Metadata/Source/AbstractSource.php b/src/Metadata/Source/AbstractSource.php
index 6a994f90..3638d561 100644
--- a/src/Metadata/Source/AbstractSource.php
+++ b/src/Metadata/Source/AbstractSource.php
@@ -98,7 +98,7 @@
  */
 abstract class AbstractSource implements MetadataInterface
 {
-    public const DEFAULT_SCHEMA = '__DEFAULT_SCHEMA__';
+    public const string DEFAULT_SCHEMA = '__DEFAULT_SCHEMA__';
 
     protected string $defaultSchema;