diff --git a/src/Command/Database/Insert.php b/src/Command/Database/Insert.php
index f35352f7..00f4e324 100644
--- a/src/Command/Database/Insert.php
+++ b/src/Command/Database/Insert.php
@@ -11,6 +11,7 @@
 use Cycle\ORM\Command\Traits\MapperTrait;
 use Cycle\ORM\Heap\State;
 use Cycle\ORM\MapperInterface;
+use Cycle\ORM\SchemaInterface;
 
 /**
  * Insert data into associated table and provide lastInsertID promise.
@@ -20,14 +21,20 @@ final class Insert extends StoreCommand
     use ErrorTrait;
     use MapperTrait;
 
+    /**
+     * @param non-empty-string $table
+     * @param string[] $primaryKeys
+     * @param non-empty-string|null $pkColumn
+     * @param array<non-empty-string, int> $generated
+     */
     public function __construct(
         DatabaseInterface $db,
         string $table,
         State $state,
         ?MapperInterface $mapper,
-        /** @var string[] */
         private array $primaryKeys = [],
-        private ?string $pkColumn = null
+        private ?string $pkColumn = null,
+        private array $generated = [],
     ) {
         parent::__construct($db, $table, $state);
         $this->mapper = $mapper;
@@ -40,7 +47,12 @@ public function isReady(): bool
 
     public function hasData(): bool
     {
-        return $this->columns !== [] || $this->state->getData() !== [];
+        return match (true) {
+            $this->columns !== [],
+            $this->state->getData() !== [],
+            $this->hasGeneratedFields() => true,
+            default => false,
+        };
     }
 
     public function getStoreData(): array
@@ -59,6 +71,7 @@ public function getStoreData(): array
     public function execute(): void
     {
         $state = $this->state;
+        $returningFields = [];
 
         if ($this->appendix !== []) {
             $state->setData($this->appendix);
@@ -72,28 +85,62 @@ public function execute(): void
                 unset($uncasted[$key]);
             }
         }
+        // unset db-generated fields if they are null
+        foreach ($this->generated as $column => $mode) {
+            if (($mode & SchemaInterface::GENERATED_DB) === 0x0) {
+                continue;
+            }
+
+            $returningFields[$column] = $mode;
+            if (!isset($uncasted[$column])) {
+                unset($uncasted[$column]);
+            }
+        }
         $uncasted = $this->prepareData($uncasted);
 
         $insert = $this->db
             ->insert($this->table)
             ->values(\array_merge($this->columns, $uncasted));
 
-        if ($this->pkColumn !== null && $insert instanceof ReturningInterface) {
-            $insert->returning($this->pkColumn);
+        if ($this->pkColumn !== null && $returningFields === []) {
+            $returningFields[$this->primaryKeys[0]] ??= $this->pkColumn;
         }
 
-        $insertID = $insert->run();
+        if ($insert instanceof ReturningInterface && $returningFields !== []) {
+            // Map generated fields to columns
+            $returning = $this->mapper->mapColumns($returningFields);
+            // Array of [field name => column name]
+            $returning = \array_combine(\array_keys($returningFields), \array_keys($returning));
+            // TODO remove:
+            $returning = \array_slice($returning, 0, 1); // only one returning field is supported
 
-        if ($insertID !== null && \count($this->primaryKeys) === 1) {
-            $fpk = $this->primaryKeys[0]; // first PK
-            if (!isset($data[$fpk])) {
+            $insert->returning(...array_values($returning));
+            $insertID = $insert->run();
+
+            if (count($returning) === 1) {
+                $field = \array_key_first($returning);
                 $state->register(
-                    $fpk,
-                    $this->mapper === null ? $insertID : $this->mapper->cast([$fpk => $insertID])[$fpk]
+                    $field,
+                    $this->mapper === null ? $insertID : $this->mapper->cast([$field => $insertID])[$field],
                 );
+            } else {
+                // todo multiple returning
+            }
+        } else {
+            $insertID = $insert->run();
+
+            if ($insertID !== null && \count($this->primaryKeys) === 1) {
+                $fpk = $this->primaryKeys[0]; // first PK
+                if (!isset($data[$fpk])) {
+                    $state->register(
+                        $fpk,
+                        $this->mapper === null ? $insertID : $this->mapper->cast([$fpk => $insertID])[$fpk]
+                    );
+                }
             }
         }
 
+
         $state->updateTransactionData();
 
         parent::execute();
@@ -103,4 +150,28 @@ public function register(string $key, mixed $value): void
     {
         $this->state->register($key, $value);
     }
+
+    /**
+     * Has fields that weren't provided but will be generated by the database or PHP.
+     */
+    private function hasGeneratedFields(): bool
+    {
+        if ($this->generated === []) {
+            return false;
+        }
+
+        $data = $this->state->getData();
+
+        foreach ($this->generated as $field => $mode) {
+            if (($mode & (SchemaInterface::GENERATED_DB | SchemaInterface::GENERATED_PHP_INSERT)) === 0x0) {
+                continue;
+            }
+
+            if (!isset($data[$field])) {
+                return true;
+            }
+        }
+
+        return true;
+    }
 }
diff --git a/src/Mapper/DatabaseMapper.php b/src/Mapper/DatabaseMapper.php
index e640aa6b..167698e6 100644
--- a/src/Mapper/DatabaseMapper.php
+++ b/src/Mapper/DatabaseMapper.php
@@ -39,6 +39,8 @@ abstract class DatabaseMapper implements MapperInterface
     protected array $primaryKeys;
     private ?TypecastInterface $typecast;
     protected RelationMap $relationMap;
+    /** @var array<non-empty-string, int> */
+    private array $generatedFields;
 
     public function __construct(
         ORMInterface $orm,
@@ -53,6 +55,7 @@ public function __construct(
             $this->columns[\is_int($property) ? $column : $property] = $column;
         }
 
+        $this->generatedFields = $schema->define($role, SchemaInterface::GENERATED_FIELDS) ?? [];
         // Parent's fields
         $parent = $schema->define($role, SchemaInterface::PARENT);
         while ($parent !== null) {
@@ -128,6 +131,7 @@ public function queueCreate(object $entity, Node $node, State $state): CommandIn
             $this,
             $this->primaryKeys,
             \count($this->primaryColumns) === 1 ? $this->primaryColumns[0] : null,
+            $this->generatedFields,
         );
     }
 
diff --git a/src/SchemaInterface.php b/src/SchemaInterface.php
index 835ab022..7ef10358 100644
--- a/src/SchemaInterface.php
+++ b/src/SchemaInterface.php
@@ -31,6 +31,13 @@ interface SchemaInterface
     public const DISCRIMINATOR = 17; // Discriminator column name for single table inheritance
     public const LISTENERS = 18;
     public const TYPECAST_HANDLER = 19; // Typecast handler definition that implements TypecastInterface
+    public const GENERATED_FIELDS = 20; // List of generated fields [field => generating type]
+
+
+    public const GENERATED_DB = 1; // sequences and others
+    public const GENERATED_PHP_INSERT = 2; // generated by PHP code on insert like uuid
+    public const GENERATED_PHP_UPDATE = 4; // generated by PHP code on update like time
+
 
     /**
      * Return all roles defined within the schema.
diff --git a/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php b/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php
index e4862582..a473fbf7 100644
--- a/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php
+++ b/tests/ORM/Functional/Driver/Common/Integration/Case321/schema.php
@@ -26,6 +26,9 @@
             'id' => 'int',
         ],
         Schema::SCHEMA => [],
+        Schema::GENERATED_FIELDS => [
+            'id' => Schema::GENERATED_DB, // autoincrement
+        ],
     ],
     'user2' => [
         Schema::ENTITY => User2::class,
@@ -44,5 +47,8 @@
             'id' => 'int',
         ],
         Schema::SCHEMA => [],
+        Schema::GENERATED_FIELDS => [
+            'id' => Schema::GENERATED_DB, // autoincrement
+        ],
     ],
 ];
diff --git a/tests/ORM/Functional/Driver/Postgres/SerialColumnTest.php b/tests/ORM/Functional/Driver/Postgres/SerialColumnTest.php
index 7afd3346..f5bad23a 100644
--- a/tests/ORM/Functional/Driver/Postgres/SerialColumnTest.php
+++ b/tests/ORM/Functional/Driver/Postgres/SerialColumnTest.php
@@ -50,6 +50,9 @@ public function setUp(): void
                 SchemaInterface::COLUMNS => ['id', 'balance'],
                 SchemaInterface::SCHEMA => [],
                 SchemaInterface::RELATIONS => [],
+                SchemaInterface::GENERATED_FIELDS => [
+                    'balance' => SchemaInterface::GENERATED_DB, // sequence
+                ],
             ],
         ]));
     }