diff --git a/4dev/database/function/upgrade_serial_to_identity.sql b/4dev/database/function/upgrade_serial_to_identity.sql
index 77585e3b..2c2ac212 100644
--- a/4dev/database/function/upgrade_serial_to_identity.sql
+++ b/4dev/database/function/upgrade_serial_to_identity.sql
@@ -1,6 +1,8 @@
--- Upgrae serial to identity type
+-- Upgrade serial to identity type
 --
--- @param reclass tbl The table where the column is located
+-- Original: https://www.enterprisedb.com/blog/postgresql-10-identity-columns-explained#section-6
+--
+-- @param reclass tbl The table where the column is located, prefix with 'schema.' if different schema
 -- @param name col The column to be changed
 -- @param varchar identity_type [default=a] Allowed a, d, assigned, default
 -- @param varchar col_type [default=''] Allowed smallint, int, bigint, int2, int4, int8
diff --git a/4dev/tests/Create/CoreLibsCreateUidsTest.php b/4dev/tests/Create/CoreLibsCreateUidsTest.php
index 3612ee89..308d9640 100644
--- a/4dev/tests/Create/CoreLibsCreateUidsTest.php
+++ b/4dev/tests/Create/CoreLibsCreateUidsTest.php
@@ -121,6 +121,7 @@ final class CoreLibsCreateUidsTest extends TestCase
 	 * must match 7e78fe0d-59b8-4637-af7f-e88d221a7d1e
 	 *
 	 * @covers ::uuidv4
+	 * @covers ::validateUuidv4
 	 * @testdox uuidv4 check that return is matching regex [$_dataName]
 	 *
 	 * @return void
@@ -129,13 +130,18 @@ final class CoreLibsCreateUidsTest extends TestCase
 	{
 		$uuid = \CoreLibs\Create\Uids::uuidv4();
 		$this->assertMatchesRegularExpression(
-			'/^[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}$/',
-			$uuid
+			'/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/',
+			$uuid,
+			'Failed regex check'
+		);
+		$this->assertTrue(
+			\CoreLibs\Create\Uids::validateUuuidv4($uuid),
+			'Failed validate regex method'
+		);
+		$this->assertFalse(
+			\CoreLibs\Create\Uids::validateUuuidv4('not-a-uuidv4'),
+			'Failed wrong uuid validated as true'
 		);
-		// $this->assertStringMatchesFormat(
-		// 	'%4s%4s-%4s-%4s-%4s-%4s%4s%4s',
-		// 	$uuid
-		// );
 	}
 
 	/**
diff --git a/www/admin/class_test.uids.php b/www/admin/class_test.uids.php
index 3801eaed..3302fe8b 100644
--- a/www/admin/class_test.uids.php
+++ b/www/admin/class_test.uids.php
@@ -52,6 +52,14 @@ print "S:UNIQID (512): " . Uids::uniqId(512) . "<br>";
 // uniq ids
 print "UNIQU ID SHORT : " . Uids::uniqIdShort() . "<br>";
 print "UNIQU ID LONG : " . Uids::uniqIdLong() . "<br>";
+// validate
+$uuidv4 = Uids::uuidv4();
+if (!Uids::validateUuuidv4($uuidv4)) {
+	print "Invalid UUIDv4: " . $uuidv4 . "<br>";
+}
+if (!Uids::validateUuuidv4("foobar")) {
+	print "Invalid UUIDv4: hard coded<Br>";
+}
 
 // DEPRECATED
 /* print "D/UUIDV4: ".$basic->uuidv4()."<br>";
diff --git a/www/lib/CoreLibs/Create/Uids.php b/www/lib/CoreLibs/Create/Uids.php
index 42339797..09bdc86b 100644
--- a/www/lib/CoreLibs/Create/Uids.php
+++ b/www/lib/CoreLibs/Create/Uids.php
@@ -56,26 +56,6 @@ class Uids
 	 */
 	public static function uuidv4(): string
 	{
-		/* return sprintf(
-			'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
-			// 32 bits for "time_low"
-			mt_rand(0, 0xffff),
-			mt_rand(0, 0xffff),
-			// 16 bits for "time_mid"
-			mt_rand(0, 0xffff),
-			// 16 bits for "time_hi_and_version",
-			// four most significant bits holds version number 4
-			mt_rand(0, 0x0fff) | 0x4000,
-			// 16 bits, 8 bits for "clk_seq_hi_res",
-			// 8 bits for "clk_seq_low",
-			// two most significant bits holds zero and one for variant DCE1.1
-			mt_rand(0, 0x3fff) | 0x8000,
-			// 48 bits for "node"
-			mt_rand(0, 0xffff),
-			mt_rand(0, 0xffff),
-			mt_rand(0, 0xffff)
-		); */
-
 		$data = random_bytes(16);
 		assert(strlen($data) == 16);
 
@@ -93,6 +73,20 @@ class Uids
 		return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
 	}
 
+	/**
+	 * regex validate uuid v4
+	 *
+	 * @param  string $uuidv4
+	 * @return bool
+	 */
+	public static function validateUuuidv4(string $uuidv4): bool
+	{
+		if (!preg_match("/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/", $uuidv4)) {
+			return false;
+		}
+		return true;
+	}
+
 	/**
 	 * creates a uniq id based on lengths
 	 *