diff --git a/src/Platforms/Data/Column.php b/src/Platforms/Data/Column.php
index d5bc088..4681e21 100644
--- a/src/Platforms/Data/Column.php
+++ b/src/Platforms/Data/Column.php
@@ -11,17 +11,21 @@ class Column
 	use StrictObjectTrait;
 
 
-	public string $name;
-	public string $type;
-	public ?int $size;
-	public ?string $default;
-	public bool $isPrimary;
-	public bool $isAutoincrement;
-	public bool $isUnsigned;
-	public bool $isNullable;
-	/**
-	 * @var mixed[]
-	 * @phpstan-var array<string, mixed>
-	 */
-	public array $meta = [];
+	public function __construct(
+		public readonly string $name,
+		public readonly string $type,
+		public readonly ?int $size,
+		public readonly ?string $default,
+		public readonly bool $isPrimary,
+		public readonly bool $isAutoincrement,
+		public readonly bool $isUnsigned,
+		public readonly bool $isNullable,
+		/**
+		 * @var mixed[]
+		 * @phpstan-var array<string, mixed>
+		 */
+		public array $meta = [],
+	)
+	{
+	}
 }
diff --git a/src/Platforms/Data/ForeignKey.php b/src/Platforms/Data/ForeignKey.php
index f1370f0..d50f8de 100644
--- a/src/Platforms/Data/ForeignKey.php
+++ b/src/Platforms/Data/ForeignKey.php
@@ -11,12 +11,16 @@ class ForeignKey
 	use StrictObjectTrait;
 
 
-	public string $name;
-	public string $schema;
-	public string $column;
-	public string $refTable;
-	public string $refTableSchema;
-	public string $refColumn;
+	public function __construct(
+		public readonly string $name,
+		public readonly string $schema,
+		public readonly string $column,
+		public readonly string $refTable,
+		public readonly string $refTableSchema,
+		public readonly string $refColumn,
+	)
+	{
+	}
 
 
 	public function getNameFqn(): string
diff --git a/src/Platforms/Data/Table.php b/src/Platforms/Data/Table.php
index 35fa659..8ee12e2 100644
--- a/src/Platforms/Data/Table.php
+++ b/src/Platforms/Data/Table.php
@@ -11,9 +11,13 @@ class Table
 	use StrictObjectTrait;
 
 
-	public string $name;
-	public string $schema;
-	public bool $isView;
+	public function __construct(
+		public readonly string $name,
+		public readonly string $schema,
+		public readonly bool $isView = false,
+	)
+	{
+	}
 
 
 	/**
diff --git a/src/Platforms/MySqlPlatform.php b/src/Platforms/MySqlPlatform.php
index f984368..b416fa0 100644
--- a/src/Platforms/MySqlPlatform.php
+++ b/src/Platforms/MySqlPlatform.php
@@ -58,11 +58,11 @@ public function getTables(?string $schema = null): array
 
 		$tables = [];
 		foreach ($result as $row) {
-			$table = new Table();
-			$table->name = (string) $row->TABLE_NAME;
-			$table->schema = (string) $row->TABLE_SCHEMA;
-			$table->isView = $row->TABLE_TYPE === 'VIEW';
-
+			$table = new Table(
+				name: (string) $row->TABLE_NAME,
+				schema: (string) $row->TABLE_SCHEMA,
+				isView: $row->TABLE_TYPE === 'VIEW',
+			);
 			$tables[$table->getUnescapedFqn()] = $table;
 		}
 		return $tables;
@@ -81,17 +81,17 @@ public function getColumns(string $table, ?string $schema = null): array
 		foreach ($query as $row) {
 			$type = explode('(', (string) $row->Type);
 
-			$column = new Column();
-			$column->name = (string) $row->Field;
-			$column->type = strtoupper($type[0]);
-			$column->size = isset($type[1]) ? (int) $type[1] : null;
-			$column->default = $row->Default !== null ? (string) $row->Default : null;
-			$column->isPrimary = $row->Key === 'PRI';
-			$column->isAutoincrement = $row->Extra === 'auto_increment';
-			$column->isUnsigned = (bool) strstr((string) $row->Type, 'unsigned');
-			$column->isNullable = $row->Null === 'YES';
-			$column->meta = [];
-
+			$column = new Column(
+				name: (string) $row->Field,
+				type: strtoupper($type[0]),
+				size: isset($type[1]) ? (int) $type[1] : null,
+				default: $row->Default !== null ? (string) $row->Default : null,
+				isPrimary: $row->Key === 'PRI',
+				isAutoincrement: $row->Extra === 'auto_increment',
+				isUnsigned: (bool) strstr((string) $row->Type, 'unsigned'),
+				isNullable: $row->Null === 'YES',
+				meta: [],
+			);
 			$columns[$column->name] = $column;
 		}
 		return $columns;
@@ -122,14 +122,14 @@ public function getForeignKeys(string $table, ?string $schema = null): array
 		/** @var array<string, ForeignKey> $keys */
 		$keys = [];
 		foreach ($result as $row) {
-			$foreignKey = new ForeignKey();
-			$foreignKey->name = (string) $row->CONSTRAINT_NAME;
-			$foreignKey->schema = (string) $row->CONSTRAINT_SCHEMA;
-			$foreignKey->column = (string) $row->COLUMN_NAME;
-			$foreignKey->refTable = (string) $row->REFERENCED_TABLE_NAME;
-			$foreignKey->refTableSchema = (string) $row->REFERENCED_TABLE_SCHEMA;
-			$foreignKey->refColumn = (string) $row->REFERENCED_COLUMN_NAME;
-
+			$foreignKey = new ForeignKey(
+				name: (string) $row->CONSTRAINT_NAME,
+				schema: (string) $row->CONSTRAINT_SCHEMA,
+				column: (string) $row->COLUMN_NAME,
+				refTable: (string) $row->REFERENCED_TABLE_NAME,
+				refTableSchema: (string) $row->REFERENCED_TABLE_SCHEMA,
+				refColumn: (string) $row->REFERENCED_COLUMN_NAME,
+			);
 			$keys[$foreignKey->column] = $foreignKey;
 		}
 		return $keys;
diff --git a/src/Platforms/PostgreSqlPlatform.php b/src/Platforms/PostgreSqlPlatform.php
index 3c5b0c9..1a39650 100644
--- a/src/Platforms/PostgreSqlPlatform.php
+++ b/src/Platforms/PostgreSqlPlatform.php
@@ -64,11 +64,11 @@ public function getTables(?string $schema = null): array
 
 		$tables = [];
 		foreach ($result as $row) {
-			$table = new Table();
-			$table->name = (string) $row->name;
-			$table->schema = (string) $row->schema;
-			$table->isView = (bool) $row->is_view;
-
+			$table = new Table(
+				name: (string) $row->name,
+				schema: (string) $row->schema,
+				isView: (bool) $row->is_view,
+			);
 			$tables[$table->getUnescapedFqn()] = $table;
 		}
 		return $tables;
@@ -110,17 +110,17 @@ public function getColumns(string $table, ?string $schema = null): array
 
 		$columns = [];
 		foreach ($result as $row) {
-			$column = new Column();
-			$column->name = (string) $row->name;
-			$column->type = (string) $row->type;
-			$column->size = $row->size !== null ? (int) $row->size : null;
-			$column->default = $row->default !== null ? (string) $row->default : null;
-			$column->isPrimary = (bool) $row->is_primary;
-			$column->isAutoincrement = (bool) $row->is_autoincrement;
-			$column->isUnsigned = false;
-			$column->isNullable = (bool) $row->is_nullable;
-			$column->meta = isset($row->sequence) ? ['sequence' => $row->sequence] : [];
-
+			$column = new Column(
+				name: (string) $row->name,
+				type: (string) $row->type,
+				size: $row->size !== null ? (int) $row->size : null,
+				default: $row->default !== null ? (string) $row->default : null,
+				isPrimary: (bool) $row->is_primary,
+				isAutoincrement: (bool) $row->is_autoincrement,
+				isUnsigned: false,
+				isNullable: (bool) $row->is_nullable,
+				meta: isset($row->sequence) ? ['sequence' => $row->sequence] : [],
+			);
 			$columns[$column->name] = $column;
 		}
 		return $columns;
@@ -157,14 +157,14 @@ public function getForeignKeys(string $table, ?string $schema = null): array
 
 		$keys = [];
 		foreach ($result as $row) {
-			$foreignKey = new ForeignKey();
-			$foreignKey->name = (string) $row->name;
-			$foreignKey->schema = (string) $row->schema;
-			$foreignKey->column = (string) $row->column;
-			$foreignKey->refTable = (string) $row->ref_table;
-			$foreignKey->refTableSchema = (string) $row->ref_table_schema;
-			$foreignKey->refColumn = (string) $row->ref_column;
-
+			$foreignKey = new ForeignKey(
+				name: (string) $row->name,
+				schema: (string) $row->schema,
+				column: (string) $row->column,
+				refTable: (string) $row->ref_table,
+				refTableSchema: (string) $row->ref_table_schema,
+				refColumn: (string) $row->ref_column,
+			);
 			$keys[$foreignKey->column] = $foreignKey;
 		}
 		return $keys;
diff --git a/src/Platforms/SqlServerPlatform.php b/src/Platforms/SqlServerPlatform.php
index b04692a..4d024e4 100644
--- a/src/Platforms/SqlServerPlatform.php
+++ b/src/Platforms/SqlServerPlatform.php
@@ -49,11 +49,11 @@ public function getTables(?string $schema = null): array
 
 		$tables = [];
 		foreach ($result as $row) {
-			$table = new Table();
-			$table->name = (string) $row->TABLE_NAME;
-			$table->schema = (string) $row->TABLE_SCHEMA;
-			$table->isView = $row->TABLE_TYPE === 'VIEW';
-
+			$table = new Table(
+				name: (string) $row->TABLE_NAME,
+				schema: (string) $row->TABLE_SCHEMA,
+				isView: $row->TABLE_TYPE === 'VIEW',
+			);
 			$tables[$table->getUnescapedFqn()] = $table;
 		}
 		return $tables;
@@ -105,17 +105,17 @@ public function getColumns(string $table, ?string $schema = null): array
 
 		$columns = [];
 		foreach ($result as $row) {
-			$column = new Column();
-			$column->name = (string) $row->name;
-			$column->type = (string) $row->type;
-			$column->size = $row->size !== null ? (int) $row->size : null;
-			$column->default = $row->default !== null ? (string) $row->default : null;
-			$column->isPrimary = (bool) $row->is_primary;
-			$column->isAutoincrement = (bool) $row->is_autoincrement;
-			$column->isUnsigned = false; // not available in SqlServer
-			$column->isNullable = (bool) $row->is_nullable;
-			$column->meta = [];
-
+			$column = new Column(
+				name: (string) $row->name,
+				type: (string) $row->type,
+				size: $row->size !== null ? (int) $row->size : null,
+				default: $row->default !== null ? (string) $row->default : null,
+				isPrimary: (bool) $row->is_primary,
+				isAutoincrement: (bool) $row->is_autoincrement,
+				isUnsigned: false, // not available in SqlServer
+				isNullable: (bool) $row->is_nullable,
+				meta: [],
+			);
 			$columns[$column->name] = $column;
 		}
 
@@ -154,14 +154,14 @@ public function getForeignKeys(string $table, ?string $schema = null): array
 
 		$keys = [];
 		foreach ($result as $row) {
-			$foreignKey = new ForeignKey();
-			$foreignKey->name = (string) $row->name;
-			$foreignKey->schema = (string) $row->schema;
-			$foreignKey->column = (string) $row->column;
-			$foreignKey->refTable = (string) $row->ref_table;
-			$foreignKey->refTableSchema = (string) $row->ref_table_schema;
-			$foreignKey->refColumn = (string) $row->ref_column;
-
+			$foreignKey = new ForeignKey(
+				name: (string) $row->name,
+				schema: (string) $row->schema,
+				column: (string) $row->column,
+				refTable: (string) $row->ref_table,
+				refTableSchema: (string) $row->ref_table_schema,
+				refColumn: (string) $row->ref_column,
+			);
 			$keys[$foreignKey->column] = $foreignKey;
 		}
 		return $keys;