diff --git a/documentation/components/libs/pg-query.md b/documentation/components/libs/pg-query.md
index c9fa54342..6da6c308a 100644
--- a/documentation/components/libs/pg-query.md
+++ b/documentation/components/libs/pg-query.md
@@ -21,115 +21,71 @@ composer require flow-php/pg-query:~--FLOW_PHP_VERSION--
 ```php
 <?php
 
-use function Flow\PgQuery\DSL\pg_parse;
+use function Flow\PgQuery\DSL\{pg_parse, pg_query_tables, pg_query_columns, pg_query_functions};
 
 $query = pg_parse('SELECT u.id, u.name FROM users u JOIN orders o ON u.id = o.user_id');
 
 // Get all tables
-foreach ($query->tables() as $table) {
+foreach (pg_query_tables($query)->all() as $table) {
     echo $table->name();  // 'users', 'orders'
     echo $table->alias(); // 'u', 'o'
 }
 
 // Get all columns
-foreach ($query->columns() as $column) {
+foreach (pg_query_columns($query)->all() as $column) {
     echo $column->name();  // 'id', 'name', 'id', 'user_id'
     echo $column->table(); // 'u', 'u', 'u', 'o'
 }
 
 // Get columns for specific table
-$userColumns = $query->columns('u');
+$userColumns = pg_query_columns($query)->forTable('u');
 
 // Get all function calls
-foreach ($query->functions() as $func) {
+foreach (pg_query_functions($query)->all() as $func) {
     echo $func->name();   // function name
     echo $func->schema(); // schema if qualified (e.g., 'pg_catalog')
 }
 ```
 
-## Parser Class
+## Parsing and Utilities
 
 ```php
 <?php
 
-use Flow\PgQuery\Parser;
-
-$parser = new Parser();
+use function Flow\PgQuery\DSL\{
+    pg_parse,
+    pg_fingerprint,
+    pg_normalize,
+    pg_normalize_utility,
+    pg_split,
+    pg_summary
+};
 
 // Parse SQL into ParsedQuery
-$query = $parser->parse('SELECT * FROM users WHERE id = 1');
+$query = pg_parse('SELECT * FROM users WHERE id = 1');
 
 // Generate fingerprint (same for structurally equivalent queries)
-$fingerprint = $parser->fingerprint('SELECT * FROM users WHERE id = 1');
+$fingerprint = pg_fingerprint('SELECT * FROM users WHERE id = 1');
 
 // Normalize query (replace literals with positional parameters)
-$normalized = $parser->normalize("SELECT * FROM users WHERE name = 'John'");
+$normalized = pg_normalize("SELECT * FROM users WHERE name = 'John'");
 // Returns: SELECT * FROM users WHERE name = $1
 
 // Normalize also handles Doctrine-style named parameters
-$normalized = $parser->normalize('SELECT * FROM users WHERE id = :id');
+$normalized = pg_normalize('SELECT * FROM users WHERE id = :id');
 // Returns: SELECT * FROM users WHERE id = $1
 
 // Normalize utility/DDL statements
-$normalized = $parser->normalizeUtility('CREATE TABLE users (id INT, name VARCHAR(255))');
+$normalized = pg_normalize_utility('CREATE TABLE users (id INT, name VARCHAR(255))');
 
 // Split multiple statements
-$statements = $parser->split('SELECT 1; SELECT 2;');
+$statements = pg_split('SELECT 1; SELECT 2;');
 // Returns: ['SELECT 1', ' SELECT 2']
 
 // Generate query summary (protobuf format, useful for logging)
-$summary = $parser->summary('SELECT * FROM users WHERE id = 1');
-```
-
-## DSL Functions
-
-```php
-<?php
-
-use function Flow\PgQuery\DSL\{
-    pg_parse,
-    pg_parser,
-    pg_fingerprint,
-    pg_normalize,
-    pg_normalize_utility,
-    pg_split,
-    pg_deparse,
-    pg_deparse_options,
-    pg_format,
-    pg_summary
-};
-
-$query = pg_parse('SELECT * FROM users');
-$parser = pg_parser();
-$fingerprint = pg_fingerprint('SELECT * FROM users WHERE id = 1');
-$normalized = pg_normalize('SELECT * FROM users WHERE id = 1');
-$normalizedDdl = pg_normalize_utility('CREATE TABLE users (id INT)');
-$statements = pg_split('SELECT 1; SELECT 2;');
-$summary = pg_summary('SELECT * FROM users');
-
-// Deparse (convert AST back to SQL)
-$sql = pg_deparse($query);  // Simple output
-$sql = pg_deparse($query, pg_deparse_options()->indentSize(2));  // Pretty printed
-
-// Format SQL (parse + deparse with pretty printing)
-$formatted = pg_format('SELECT id,name FROM users WHERE active=true');
-// Returns:
-// SELECT id, name
-// FROM users
-// WHERE active = true
+$summary = pg_summary('SELECT * FROM users WHERE id = 1');
 ```
 
-## ParsedQuery Methods
-
-| Method | Description | Returns |
-|--------|-------------|---------|
-| `tables()` | Get all tables referenced in the query | `array<Table>` |
-| `columns(?string $tableName)` | Get columns, optionally filtered by table/alias | `array<Column>` |
-| `functions()` | Get all function calls | `array<FunctionCall>` |
-| `deparse(?DeparseOptions $options)` | Convert AST back to SQL string | `string` |
-| `traverse(NodeVisitor ...$visitors)` | Traverse AST with custom visitors | `void` |
-| `raw()` | Access underlying protobuf ParseResult | `ParseResult` |
-
 ## Deparsing (AST to SQL)
 
 Convert a parsed query back to SQL, optionally with pretty-printing:
@@ -137,17 +93,16 @@ Convert a parsed query back to SQL, optionally with pretty-printing:
 ```php
 <?php
 
-use Flow\PgQuery\{DeparseOptions, Parser};
+use function Flow\PgQuery\DSL\{pg_parse, pg_deparse, pg_deparse_options, pg_format};
 
-$parser = new Parser();
-$query = $parser->parse('SELECT u.id, u.name FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true');
+$query = pg_parse('SELECT u.id, u.name FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true');
 
 // Simple deparse (compact output)
-$sql = $query->deparse();
+$sql = pg_deparse($query);
 // Returns: SELECT u.id, u.name FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true
 
 // Pretty-printed output
-$sql = $query->deparse(DeparseOptions::new());
+$sql = pg_deparse($query, pg_deparse_options());
 // Returns:
 // SELECT u.id, u.name
 // FROM
@@ -156,13 +111,15 @@ $sql = $query->deparse(DeparseOptions::new());
 // WHERE u.active = true
 
 // Custom formatting options
-$sql = $query->deparse(
-    DeparseOptions::new()
-        ->indentSize(2)           // 2 spaces per indent level
-        ->maxLineLength(60)       // Wrap at 60 characters
-        ->trailingNewline()       // Add newline at end
-        ->commasStartOfLine()     // Place commas at line start
+$sql = pg_deparse($query, pg_deparse_options()
+    ->indentSize(2)           // 2 spaces per indent level
+    ->maxLineLength(60)       // Wrap at 60 characters
+    ->trailingNewline()       // Add newline at end
+    ->commasStartOfLine()     // Place commas at line start
 );
+
+// Shorthand: parse and format in one step
+$formatted = pg_format('SELECT id,name FROM users WHERE active=true');
 ```
 
 ### DeparseOptions
@@ -243,6 +200,199 @@ Visitors declare which node type they handle via `nodeClass()`. Return values:
 - `FuncCallCollector` - collects all `FuncCall` nodes
 - `RangeVarCollector` - collects all `RangeVar` nodes
 
+## Query Modification
+
+Beyond reading the AST, you can modify queries programmatically using modifiers. The library includes pagination modifiers as the primary use case.
+
+### Offset-Based Pagination
+
+Add LIMIT/OFFSET pagination to any SELECT query:
+
+```php
+<?php
+
+use function Flow\PgQuery\DSL\pg_to_paginated_query;
+
+$sql = 'SELECT * FROM users ORDER BY created_at DESC';
+
+$page1 = pg_to_paginated_query($sql, limit: 25, offset: 0);
+// SELECT * FROM users ORDER BY created_at DESC LIMIT 25
+
+$page2 = pg_to_paginated_query($sql, limit: 25, offset: 25);
+// SELECT * FROM users ORDER BY created_at DESC LIMIT 25 OFFSET 25
+```
+
+Works with complex queries including JOINs, CTEs, subqueries, and UNION:
+
+```php
+<?php
+
+use function Flow\PgQuery\DSL\pg_to_paginated_query;
+
+$sql = <<<'SQL'
+    WITH active_users AS (
+        SELECT id, name FROM users WHERE status = 'active'
+    )
+    SELECT au.*, COUNT(o.id) as order_count
+    FROM active_users au
+    LEFT JOIN orders o ON au.id = o.user_id
+    GROUP BY au.id, au.name
+    ORDER BY order_count DESC
+    SQL;
+
+$paginated = pg_to_paginated_query($sql, limit: 10, offset: 0);
+```
+
+### Count Query Generation
+
+Generate COUNT queries for pagination UIs ("Page 1 of 10"):
+
+```php
+<?php
+
+use function Flow\PgQuery\DSL\{pg_to_count_query, pg_to_paginated_query};
+
+$sql = 'SELECT * FROM products WHERE active = true ORDER BY name';
+
+$countQuery = pg_to_count_query($sql);
+// SELECT count(*) FROM (SELECT * FROM products WHERE active = true) _count_subq
+
+$page1 = pg_to_paginated_query($sql, limit: 20, offset: 0);
+```
+
+The COUNT modifier automatically removes ORDER BY (optimization) and wraps the query in a subquery.
+
+### Keyset (Cursor) Pagination
+
+For large datasets, keyset pagination is more efficient than OFFSET. It uses indexed WHERE conditions instead of scanning and skipping rows:
+
+```php
+<?php
+
+use Flow\PgQuery\AST\Transformers\SortOrder;
+
+use function Flow\PgQuery\DSL\{pg_to_keyset_query, pg_keyset_column};
+
+$sql = 'SELECT * FROM audit_log ORDER BY created_at DESC, id DESC';
+
+$columns = [
+    pg_keyset_column('created_at', SortOrder::DESC),
+    pg_keyset_column('id', SortOrder::DESC),
+];
+
+$page1 = pg_to_keyset_query($sql, limit: 100, columns: $columns, cursor: null);
+// SELECT * FROM audit_log ORDER BY created_at DESC, id DESC LIMIT 100
+
+$page2 = pg_to_keyset_query($sql, limit: 100, columns: $columns, cursor: ['2025-01-15 14:30:00', 1000]);
+// SELECT * FROM audit_log WHERE created_at < $1 OR (created_at = $1 AND id < $2) ORDER BY created_at DESC, id DESC LIMIT 100
+```
+
+The cursor values come from the last row of the previous page. Keyset pagination:
+- Uses O(log n) index lookups instead of O(n) row scanning
+- Handles mixed ASC/DESC sort orders correctly
+- Works with existing WHERE conditions (combined with AND)
+
+### Using Modifiers Directly
+
+For more control, you can use modifier objects directly with `traverse()`:
+
+```php
+<?php
+
+use Flow\PgQuery\AST\Transformers\SortOrder;
+
+use function Flow\PgQuery\DSL\{
+    pg_parse,
+    pg_pagination,
+    pg_count_modifier,
+    pg_keyset_pagination,
+    pg_keyset_column
+};
+
+// Offset pagination modifier
+$query = pg_parse('SELECT * FROM users ORDER BY id');
+$query->traverse(pg_pagination(limit: 10, offset: 20));
+echo $query->deparse(); // SELECT * FROM users ORDER BY id LIMIT 10 OFFSET 20
+
+// Count modifier
+$query = pg_parse('SELECT * FROM users WHERE active = true ORDER BY name');
+$query->traverse(pg_count_modifier());
+echo $query->deparse(); // SELECT count(*) FROM (SELECT * FROM users WHERE active = true) _count_subq
+
+// Keyset pagination modifier
+$query = pg_parse('SELECT * FROM users ORDER BY created_at, id');
+$query->traverse(pg_keyset_pagination(
+    limit: 10,
+    columns: [
+        pg_keyset_column('created_at', SortOrder::ASC),
+        pg_keyset_column('id', SortOrder::ASC),
+    ],
+    cursor: ['2025-01-15', 42]
+));
+echo $query->deparse();
+// SELECT * FROM users WHERE created_at > $1 OR (created_at = $1 AND id > $2) ORDER BY created_at, id LIMIT 10
+```
+
+### Custom Modifiers
+
+Create custom modifiers by implementing the `NodeModifier` interface:
+
+```php
+<?php
+
+use Flow\PgQuery\AST\{ModificationContext, NodeModifier};
+use Flow\PgQuery\Protobuf\AST\SelectStmt;
+
+use function Flow\PgQuery\DSL\{pg_parse, pg_deparse};
+
+final readonly class AddDistinctModifier implements NodeModifier
+{
+    public static function nodeClass(): string
+    {
+        return SelectStmt::class;
+    }
+
+    public function modify(object $node, ModificationContext $context): int|object|null
+    {
+        if (!$context->isTopLevel()) {
+            return null;
+        }
+
+        $node->setDistinctClause([new \Flow\PgQuery\Protobuf\AST\Node()]);
+
+        return null;
+    }
+}
+
+$query = pg_parse('SELECT id, name FROM users');
+$query->traverse(new AddDistinctModifier());
+echo pg_deparse($query); // SELECT DISTINCT id, name FROM users
+```
+
+### NodeModifier Interface
+
+```php
+interface NodeModifier
+{
+    /** @return class-string */
+    public static function nodeClass(): string;
+
+    public function modify(object $node, ModificationContext $context): int|object|null;
+}
+```
+
+The `ModificationContext` provides:
+- `$context->depth` - current traversal depth
+- `$context->ancestors` - array of parent nodes
+- `$context->getParent()` - immediate parent node
+- `$context->isTopLevel()` - whether this is the top-level statement
+
+Return values:
+- `null` - continue traversal
+- `Traverser::DONT_TRAVERSE_CHILDREN` - skip children
+- `Traverser::STOP_TRAVERSAL` - stop entire traversal
+- `object` - replace current node with returned object
+
 ## Raw AST Access
 
 For full control, access the protobuf AST directly:
@@ -273,19 +423,25 @@ foreach ($query->raw()->getStmts() as $stmt) {
 ```php
 <?php
 
-use Flow\PgQuery\Parser;
-use Flow\PgQuery\Exception\{ParserException, ExtensionNotLoadedException};
+use Flow\PgQuery\Exception\{ParserException, ExtensionNotLoadedException, PaginationException};
+
+use function Flow\PgQuery\DSL\{pg_parse, pg_pagination};
 
 try {
-    $parser = new Parser();
+    $query = pg_parse('INVALID SQL');
 } catch (ExtensionNotLoadedException $e) {
     // pg_query extension is not loaded
+} catch (ParserException $e) {
+    echo "Parse error: " . $e->getMessage();
 }
 
 try {
-    $parser->parse('INVALID SQL');
-} catch (ParserException $e) {
-    echo "Parse error: " . $e->getMessage();
+    // OFFSET without ORDER BY throws exception
+    $query = pg_parse('SELECT * FROM users');
+    $query->traverse(pg_pagination(10, 5));
+} catch (PaginationException $e) {
+    echo "Pagination error: " . $e->getMessage();
+    // "OFFSET without ORDER BY produces non-deterministic results"
 }
 ```
 
diff --git a/src/cli/composer.json b/src/cli/composer.json
index 392339c4c..a50cbecd4 100644
--- a/src/cli/composer.json
+++ b/src/cli/composer.json
@@ -22,7 +22,7 @@
         "flow-php/etl-adapter-chartjs": "self.version",
         "flow-php/openapi-specification-bridge": "self.version",
         "flow-php/parquet-viewer": "self.version",
-        "flow-php/pg-query": "1.x-dev"
+        "flow-php/pg-query": "self.version"
     },
     "config": {
         "optimize-autoloader": true,
diff --git a/src/core/etl/composer.json b/src/core/etl/composer.json
index a750b49c3..602eb8478 100644
--- a/src/core/etl/composer.json
+++ b/src/core/etl/composer.json
@@ -17,6 +17,7 @@
         "flow-php/types": "self.version",
         "flow-php/array-dot": "self.version",
         "flow-php/filesystem": "self.version",
+        "flow-php/pg-query": "self.version",
         "psr/simple-cache": "^1.0 || ^2.0 || ^3.0",
         "webmozart/glob": "^3.0 || ^4.0",
         "symfony/string": "^6.4 || ^7.3 || ^8.0"
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/ModificationContext.php b/src/lib/pg-query/src/Flow/PgQuery/AST/ModificationContext.php
new file mode 100644
index 000000000..2d3ec3add
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/ModificationContext.php
@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST;
+
+/**
+ * Provides context information during AST modification.
+ *
+ * This class gives modifiers access to the traversal state, including
+ * parent nodes and depth in the tree, enabling context-aware modifications.
+ */
+final readonly class ModificationContext
+{
+    /**
+     * @param array<object> $ancestors Stack of parent nodes (from root to immediate parent)
+     * @param int $depth Current depth in the AST (1-based, root statements are at depth 1)
+     */
+    public function __construct(
+        private array $ancestors,
+        private int $depth,
+    ) {
+    }
+
+    /**
+     * @return array<object>
+     */
+    public function ancestors() : array
+    {
+        return $this->ancestors;
+    }
+
+    public function depth() : int
+    {
+        return $this->depth;
+    }
+
+    public function isTopLevel() : bool
+    {
+        return $this->depth === 1;
+    }
+
+    public function parent() : ?object
+    {
+        return $this->ancestors[\count($this->ancestors) - 1] ?? null;
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/NodeModifier.php b/src/lib/pg-query/src/Flow/PgQuery/AST/NodeModifier.php
new file mode 100644
index 000000000..f6e621868
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/NodeModifier.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST;
+
+/**
+ * Interface for AST node modifiers.
+ *
+ * Modifiers can mutate nodes in-place during traversal.
+ * Unlike visitors (which are read-only collectors), modifiers are expected to change the AST.
+ */
+interface NodeModifier
+{
+    /**
+     * Don't traverse children of the current node.
+     */
+    public const DONT_TRAVERSE_CHILDREN = 1;
+
+    /**
+     * Stop the entire traversal.
+     */
+    public const STOP_TRAVERSAL = 2;
+
+    /**
+     * Returns the fully qualified class name of the node type this modifier handles.
+     *
+     * @return class-string The node class this modifier is registered for
+     */
+    public static function nodeClass() : string;
+
+    /**
+     * Called to modify a node of the registered type.
+     *
+     * The modifier can:
+     * - Mutate the node in-place and return null to continue traversal
+     * - Return DONT_TRAVERSE_CHILDREN to skip child nodes
+     * - Return STOP_TRAVERSAL to stop the entire traversal
+     * - Return a new node to replace the current node (used for wrapping operations)
+     *
+     * @param object $node The node instance to modify (type depends on nodeClass())
+     * @param ModificationContext $context Context providing parent information
+     *
+     * @return null|int|object
+     *                         - null: Continue traversal (node unchanged or modified in-place)
+     *                         - int (DONT_TRAVERSE_CHILDREN, STOP_TRAVERSAL): Control flow
+     *                         - object: Replace current node with returned node
+     */
+    public function modify(object $node, ModificationContext $context) : int|object|null;
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/CountModifier.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/CountModifier.php
new file mode 100644
index 000000000..41f8c98c5
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/CountModifier.php
@@ -0,0 +1,117 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+use Flow\PgQuery\AST\{ModificationContext, NodeModifier};
+use Flow\PgQuery\Protobuf\AST\{
+    Alias,
+    ColumnRef,
+    FuncCall,
+    Node,
+    PBString,
+    RangeSubselect,
+    ResTarget,
+    SelectStmt
+};
+use Flow\PgQuery\Protobuf\AST\A_Star;
+
+/**
+ * Transforms SELECT queries into COUNT queries for pagination.
+ *
+ * Wraps the original query in: SELECT COUNT(*) FROM (...) AS _count_subq
+ * - Removes ORDER BY (not needed for counting)
+ * - Removes LIMIT/OFFSET (we want total count)
+ */
+final readonly class CountModifier implements NodeModifier
+{
+    public static function nodeClass() : string
+    {
+        return SelectStmt::class;
+    }
+
+    /** @phpstan-ignore return.unusedType (interface requires full signature) */
+    public function modify(object $node, ModificationContext $context) : int|object|null
+    {
+        /** @var SelectStmt $node */
+        if (!$context->isTopLevel()) {
+            return null;
+        }
+
+        $this->removeOrderBy($node);
+        $this->removeLimitOffset($node);
+
+        return $this->wrapWithCount($node);
+    }
+
+    private function createCountFunctionCall() : Node
+    {
+        $aStar = new A_Star();
+        $aStarNode = new Node();
+        $aStarNode->setAStar($aStar);
+
+        $columnRef = new ColumnRef();
+        $columnRef->setFields([$aStarNode]);
+
+        $columnRefNode = new Node();
+        $columnRefNode->setColumnRef($columnRef);
+
+        $funcName = new PBString();
+        $funcName->setSval('count');
+        $funcNameNode = new Node();
+        $funcNameNode->setString($funcName);
+
+        $funcCall = new FuncCall();
+        $funcCall->setFuncname([$funcNameNode]);
+        $funcCall->setArgs([$columnRefNode]);
+        $funcCall->setAggStar(true);
+
+        $funcCallNode = new Node();
+        $funcCallNode->setFuncCall($funcCall);
+
+        return $funcCallNode;
+    }
+
+    private function removeLimitOffset(SelectStmt $stmt) : void
+    {
+        $stmt->clearLimitCount();
+        $stmt->clearLimitOffset();
+    }
+
+    private function removeOrderBy(SelectStmt $stmt) : void
+    {
+        $stmt->setSortClause([]);
+    }
+
+    private function wrapWithCount(SelectStmt $stmt) : Node
+    {
+        $innerNode = new Node();
+        $innerNode->setSelectStmt($stmt);
+
+        $alias = new Alias();
+        $alias->setAliasname('_count_subq');
+
+        $rangeSubselect = new RangeSubselect();
+        $rangeSubselect->setSubquery($innerNode);
+        $rangeSubselect->setAlias($alias);
+
+        $rangeSubselectNode = new Node();
+        $rangeSubselectNode->setRangeSubselect($rangeSubselect);
+
+        $resTarget = new ResTarget();
+        $resTarget->setVal($this->createCountFunctionCall());
+
+        $resTargetNode = new Node();
+        $resTargetNode->setResTarget($resTarget);
+
+        $outerSelect = new SelectStmt();
+        $outerSelect->setTargetList([$resTargetNode]);
+        $outerSelect->setFromClause([$rangeSubselectNode]);
+
+        $resultNode = new Node();
+        $resultNode->setSelectStmt($outerSelect);
+
+        return $resultNode;
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetColumn.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetColumn.php
new file mode 100644
index 000000000..5126d984e
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetColumn.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+/**
+ * Defines a column for keyset pagination.
+ */
+final readonly class KeysetColumn
+{
+    public function __construct(
+        public string $column,
+        public SortOrder $order = SortOrder::ASC,
+    ) {
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationConfig.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationConfig.php
new file mode 100644
index 000000000..4bf2248fe
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationConfig.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+/**
+ * Configuration for keyset (cursor-based) pagination.
+ *
+ * @psalm-type CursorValue = string|int|float|bool|null
+ */
+final readonly class KeysetPaginationConfig
+{
+    /**
+     * @param int $limit Maximum number of rows to return
+     * @param list<KeysetColumn> $columns Columns to use for keyset comparison (must match ORDER BY)
+     * @param null|list<CursorValue> $cursor Values from the last row of previous page (null for first page)
+     */
+    public function __construct(
+        public int $limit,
+        public array $columns,
+        public ?array $cursor = null,
+    ) {
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationModifier.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationModifier.php
new file mode 100644
index 000000000..73b5e9c18
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/KeysetPaginationModifier.php
@@ -0,0 +1,217 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+use Flow\PgQuery\AST\{ModificationContext, NodeModifier};
+use Flow\PgQuery\Exception\PaginationException;
+use Flow\PgQuery\Protobuf\AST\{
+    A_Const,
+    A_Expr,
+    A_Expr_Kind,
+    BoolExpr,
+    BoolExprType,
+    ColumnRef,
+    Integer,
+    LimitOption,
+    Node,
+    PBString,
+    ParamRef,
+    SelectStmt
+};
+
+/**
+ * Applies keyset (cursor-based) pagination to SELECT queries.
+ *
+ * Keyset pagination is more efficient than OFFSET for large datasets because
+ * it uses indexed WHERE conditions instead of skipping rows.
+ *
+ * For first page (no cursor): Just adds LIMIT
+ * For subsequent pages: Adds WHERE (col1, col2) > ($1, $2) AND existing_where
+ */
+final readonly class KeysetPaginationModifier implements NodeModifier
+{
+    public function __construct(
+        private KeysetPaginationConfig $config,
+    ) {
+    }
+
+    public static function nodeClass() : string
+    {
+        return SelectStmt::class;
+    }
+
+    /** @phpstan-ignore return.unusedType (interface requires full signature) */
+    public function modify(object $node, ModificationContext $context) : int|object|null
+    {
+        /** @var SelectStmt $node */
+        if (!$context->isTopLevel()) {
+            return null;
+        }
+
+        if (\count($this->config->columns) === 0) {
+            throw new PaginationException('Keyset pagination requires at least one column');
+        }
+
+        if (!$this->hasOrderBy($node)) {
+            throw new PaginationException('Keyset pagination requires ORDER BY clause');
+        }
+
+        $this->applyLimit($node);
+
+        if ($this->config->cursor !== null) {
+            if (\count($this->config->cursor) !== \count($this->config->columns)) {
+                throw new PaginationException(\sprintf(
+                    'Cursor values count (%d) must match columns count (%d)',
+                    \count($this->config->cursor),
+                    \count($this->config->columns)
+                ));
+            }
+
+            $this->applyKeysetWhere($node);
+        }
+
+        return NodeModifier::DONT_TRAVERSE_CHILDREN;
+    }
+
+    private function applyKeysetWhere(SelectStmt $stmt) : void
+    {
+        $keysetCondition = $this->buildKeysetCondition();
+
+        $existingWhere = $stmt->getWhereClause();
+
+        if ($existingWhere !== null) {
+            $andExpr = new BoolExpr();
+            $andExpr->setBoolop(BoolExprType::AND_EXPR);
+            $andExpr->setArgs([$existingWhere, $keysetCondition]);
+
+            $andNode = new Node();
+            $andNode->setBoolExpr($andExpr);
+
+            $stmt->setWhereClause($andNode);
+        } else {
+            $stmt->setWhereClause($keysetCondition);
+        }
+    }
+
+    private function applyLimit(SelectStmt $stmt) : void
+    {
+        $stmt->setLimitOption(LimitOption::LIMIT_OPTION_COUNT);
+        $stmt->setLimitCount($this->createIntegerNode($this->config->limit));
+    }
+
+    private function buildComparisonExpr(Node $leftColumnRef, int $paramNumber, string $operator) : Node
+    {
+        $paramRef = new ParamRef();
+        $paramRef->setNumber($paramNumber);
+
+        $paramNode = new Node();
+        $paramNode->setParamRef($paramRef);
+
+        $opName = new PBString();
+        $opName->setSval($operator);
+        $opNameNode = new Node();
+        $opNameNode->setString($opName);
+
+        $aExpr = new A_Expr();
+        $aExpr->setKind(A_Expr_Kind::AEXPR_OP);
+        $aExpr->setName([$opNameNode]);
+        $aExpr->setLexpr($leftColumnRef);
+        $aExpr->setRexpr($paramNode);
+
+        $exprNode = new Node();
+        $exprNode->setAExpr($aExpr);
+
+        return $exprNode;
+    }
+
+    private function buildKeysetCondition() : Node
+    {
+        $columns = $this->config->columns;
+        $orConditions = [];
+
+        for ($i = 0, $count = \count($columns); $i < $count; $i++) {
+            $andConditions = [];
+
+            for ($j = 0; $j < $i; $j++) {
+                $colRef = $this->createColumnRef($columns[$j]->column);
+                $andConditions[] = $this->buildComparisonExpr($colRef, $j + 1, '=');
+            }
+
+            $colRef = $this->createColumnRef($columns[$i]->column);
+            $operator = $columns[$i]->order === SortOrder::ASC ? '>' : '<';
+            $andConditions[] = $this->buildComparisonExpr($colRef, $i + 1, $operator);
+
+            if (\count($andConditions) === 1) {
+                $orConditions[] = $andConditions[0];
+            } else {
+                $andExpr = new BoolExpr();
+                $andExpr->setBoolop(BoolExprType::AND_EXPR);
+                $andExpr->setArgs($andConditions);
+
+                $andNode = new Node();
+                $andNode->setBoolExpr($andExpr);
+
+                $orConditions[] = $andNode;
+            }
+        }
+
+        if (\count($orConditions) === 1) {
+            return $orConditions[0];
+        }
+
+        $orExpr = new BoolExpr();
+        $orExpr->setBoolop(BoolExprType::OR_EXPR);
+        $orExpr->setArgs($orConditions);
+
+        $orNode = new Node();
+        $orNode->setBoolExpr($orExpr);
+
+        return $orNode;
+    }
+
+    private function createColumnRef(string $columnName) : Node
+    {
+        $parts = \explode('.', $columnName);
+        $fields = [];
+
+        foreach ($parts as $part) {
+            $str = new PBString();
+            $str->setSval($part);
+            $strNode = new Node();
+            $strNode->setString($str);
+            $fields[] = $strNode;
+        }
+
+        $columnRef = new ColumnRef();
+        $columnRef->setFields($fields);
+
+        $columnRefNode = new Node();
+        $columnRefNode->setColumnRef($columnRef);
+
+        return $columnRefNode;
+    }
+
+    private function createIntegerNode(int $value) : Node
+    {
+        $integer = new Integer();
+        $integer->setIval($value);
+
+        $aConst = new A_Const();
+        /** @phpstan-ignore argument.type (protobuf PHPDoc says int but actually expects Integer) */
+        $aConst->setIval($integer);
+
+        $node = new Node();
+        $node->setAConst($aConst);
+
+        return $node;
+    }
+
+    private function hasOrderBy(SelectStmt $stmt) : bool
+    {
+        $sortClause = $stmt->getSortClause();
+
+        return $sortClause !== null && \count($sortClause) > 0;
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationConfig.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationConfig.php
new file mode 100644
index 000000000..23bb19450
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationConfig.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+/**
+ * Configuration for OFFSET-based pagination transformations.
+ */
+final readonly class PaginationConfig
+{
+    public function __construct(
+        public int $limit,
+        public int $offset = 0,
+    ) {
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationModifier.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationModifier.php
new file mode 100644
index 000000000..aa156c064
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/PaginationModifier.php
@@ -0,0 +1,155 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+use Flow\PgQuery\AST\{ModificationContext, NodeModifier};
+use Flow\PgQuery\Exception\PaginationException;
+use Flow\PgQuery\Protobuf\AST\{
+    A_Const,
+    A_Star,
+    Alias,
+    ColumnRef,
+    Integer,
+    LimitOption,
+    Node,
+    RangeSubselect,
+    ResTarget,
+    SelectStmt,
+    SetOperation
+};
+
+/**
+ * Modifies SELECT queries to add LIMIT/OFFSET pagination.
+ *
+ * Always overrides any existing LIMIT/OFFSET clauses.
+ * Validates that OFFSET requires ORDER BY (strict mode).
+ *
+ * For set operations (UNION/INTERSECT/EXCEPT), the query is wrapped in a
+ * subquery to ensure correct semantics:
+ * SELECT * FROM (...original query...) AS _pagination_subq LIMIT x OFFSET y
+ */
+final readonly class PaginationModifier implements NodeModifier
+{
+    public function __construct(
+        private PaginationConfig $config,
+    ) {
+    }
+
+    public static function nodeClass() : string
+    {
+        return SelectStmt::class;
+    }
+
+    public function modify(object $node, ModificationContext $context) : int|object|null
+    {
+        /** @var SelectStmt $node */
+        if (!$context->isTopLevel()) {
+            return null;
+        }
+
+        if ($this->config->offset > 0 && !$this->hasOrderBy($node)) {
+            throw new PaginationException(
+                'OFFSET without ORDER BY produces non-deterministic results'
+            );
+        }
+
+        if ($this->isSetOperation($node)) {
+            return $this->wrapSetOperationWithPagination($node);
+        }
+
+        $this->applyPagination($node);
+
+        return NodeModifier::DONT_TRAVERSE_CHILDREN;
+    }
+
+    private function applyPagination(SelectStmt $stmt) : void
+    {
+        $stmt->setLimitOption(LimitOption::LIMIT_OPTION_COUNT);
+        $stmt->setLimitCount($this->createIntegerNode($this->config->limit));
+
+        if ($this->config->offset > 0) {
+            $stmt->setLimitOffset($this->createIntegerNode($this->config->offset));
+        } else {
+            $stmt->clearLimitOffset();
+        }
+    }
+
+    private function createIntegerNode(int $value) : Node
+    {
+        $integer = new Integer();
+        $integer->setIval($value);
+
+        $aConst = new A_Const();
+        /** @phpstan-ignore argument.type (protobuf PHPDoc says int but actually expects Integer) */
+        $aConst->setIval($integer);
+
+        $node = new Node();
+        $node->setAConst($aConst);
+
+        return $node;
+    }
+
+    private function hasOrderBy(SelectStmt $stmt) : bool
+    {
+        $sortClause = $stmt->getSortClause();
+
+        return $sortClause !== null && \count($sortClause) > 0;
+    }
+
+    private function isSetOperation(SelectStmt $stmt) : bool
+    {
+        $op = $stmt->getOp();
+
+        return $op !== SetOperation::SETOP_NONE
+            && $op !== SetOperation::SET_OPERATION_UNDEFINED;
+    }
+
+    private function wrapSetOperationWithPagination(SelectStmt $stmt) : Node
+    {
+        $innerNode = new Node();
+        $innerNode->setSelectStmt($stmt);
+
+        $alias = new Alias();
+        $alias->setAliasname('_pagination_subq');
+
+        $rangeSubselect = new RangeSubselect();
+        $rangeSubselect->setSubquery($innerNode);
+        $rangeSubselect->setAlias($alias);
+
+        $rangeSubselectNode = new Node();
+        $rangeSubselectNode->setRangeSubselect($rangeSubselect);
+
+        $aStar = new A_Star();
+        $aStarNode = new Node();
+        $aStarNode->setAStar($aStar);
+
+        $columnRef = new ColumnRef();
+        $columnRef->setFields([$aStarNode]);
+
+        $columnRefNode = new Node();
+        $columnRefNode->setColumnRef($columnRef);
+
+        $resTarget = new ResTarget();
+        $resTarget->setVal($columnRefNode);
+
+        $resTargetNode = new Node();
+        $resTargetNode->setResTarget($resTarget);
+
+        $outerSelect = new SelectStmt();
+        $outerSelect->setTargetList([$resTargetNode]);
+        $outerSelect->setFromClause([$rangeSubselectNode]);
+        $outerSelect->setLimitOption(LimitOption::LIMIT_OPTION_COUNT);
+        $outerSelect->setLimitCount($this->createIntegerNode($this->config->limit));
+
+        if ($this->config->offset > 0) {
+            $outerSelect->setLimitOffset($this->createIntegerNode($this->config->offset));
+        }
+
+        $resultNode = new Node();
+        $resultNode->setSelectStmt($outerSelect);
+
+        return $resultNode;
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/SortOrder.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/SortOrder.php
new file mode 100644
index 000000000..e24094af6
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Transformers/SortOrder.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\AST\Transformers;
+
+enum SortOrder : string
+{
+    case ASC = 'ASC';
+    case DESC = 'DESC';
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/AST/Traverser.php b/src/lib/pg-query/src/Flow/PgQuery/AST/Traverser.php
index 90f2fe8a0..e6fdb7b5e 100644
--- a/src/lib/pg-query/src/Flow/PgQuery/AST/Traverser.php
+++ b/src/lib/pg-query/src/Flow/PgQuery/AST/Traverser.php
@@ -9,11 +9,22 @@
 /**
  * AST Traverser for PostgreSQL parse trees.
  *
- * Traverses the AST and calls registered visitors for specific node types.
- * Visitors only receive nodes of the type they are registered for.
+ * Traverses the AST and calls registered visitors and modifiers for specific node types.
+ * Visitors receive nodes for read-only operations (collection, analysis).
+ * Modifiers receive nodes with context for mutation operations.
  */
 final class Traverser
 {
+    /** @var array<object> */
+    private array $ancestorStack = [];
+
+    private int $currentDepth = 0;
+
+    /**
+     * @var array<class-string, array<NodeModifier>>
+     */
+    private readonly array $modifiers;
+
     private bool $stopTraversal = false;
 
     /**
@@ -21,16 +32,25 @@ final class Traverser
      */
     private readonly array $visitors;
 
-    public function __construct(NodeVisitor ...$visitors)
+    public function __construct(NodeVisitor|NodeModifier ...$handlers)
     {
-        $indexed = [];
+        $visitors = [];
+        $modifiers = [];
+
+        foreach ($handlers as $handler) {
+            $nodeClass = $handler::nodeClass();
+
+            if ($handler instanceof NodeModifier) {
+                $modifiers[$nodeClass][] = $handler;
+            }
 
-        foreach ($visitors as $visitor) {
-            $nodeClass = $visitor::nodeClass();
-            $indexed[$nodeClass][] = $visitor;
+            if ($handler instanceof NodeVisitor) {
+                $visitors[$nodeClass][] = $handler;
+            }
         }
 
-        $this->visitors = $indexed;
+        $this->visitors = $visitors;
+        $this->modifiers = $modifiers;
     }
 
     /**
@@ -39,12 +59,24 @@ public function __construct(NodeVisitor ...$visitors)
     public function traverse(ParseResult $parseResult) : void
     {
         $this->stopTraversal = false;
+        $this->ancestorStack = [];
+        $this->currentDepth = 0;
 
         foreach ($parseResult->getStmts() as $rawStmt) {
+            $this->currentDepth = 1;
             $stmt = $rawStmt->getStmt();
 
-            if ($stmt !== null && !$this->traverseNode($stmt)) {
-                return;
+            if ($stmt !== null) {
+                $replacement = $this->traverseNode($stmt);
+
+                if ($replacement instanceof Node) {
+                    $rawStmt->setStmt($replacement);
+                }
+
+                /** @phpstan-ignore if.alwaysFalse (stopTraversal can be modified by traverseNode) */
+                if ($this->stopTraversal) {
+                    return;
+                }
             }
         }
     }
@@ -157,19 +189,42 @@ private function extractInnerNodes(Node $node) : array
         return $nodes;
     }
 
-    private function traverseNode(Node $node) : bool
+    private function traverseNode(Node $node) : ?Node
     {
         if ($this->stopTraversal) {
-            return false;
+            return null;
         }
 
         $traverseChildren = true;
+        $replacement = null;
 
         $innerNodes = $this->extractInnerNodes($node);
+        $context = new ModificationContext($this->ancestorStack, $this->currentDepth);
 
         foreach ($innerNodes as $innerNode) {
             $nodeClass = $innerNode::class;
 
+            if (isset($this->modifiers[$nodeClass])) {
+                foreach ($this->modifiers[$nodeClass] as $modifier) {
+                    $result = $modifier->modify($innerNode, $context);
+
+                    if ($result === NodeModifier::STOP_TRAVERSAL) {
+                        $this->stopTraversal = true;
+
+                        return null;
+                    }
+
+                    if ($result === NodeModifier::DONT_TRAVERSE_CHILDREN) {
+                        $traverseChildren = false;
+                    }
+
+                    if ($result instanceof Node) {
+                        $replacement = $result;
+                        $traverseChildren = false;
+                    }
+                }
+            }
+
             if (isset($this->visitors[$nodeClass])) {
                 foreach ($this->visitors[$nodeClass] as $visitor) {
                     $result = $visitor->enter($innerNode);
@@ -177,7 +232,7 @@ private function traverseNode(Node $node) : bool
                     if ($result === NodeVisitor::STOP_TRAVERSAL) {
                         $this->stopTraversal = true;
 
-                        return false;
+                        return null;
                     }
 
                     if ($result === NodeVisitor::DONT_TRAVERSE_CHILDREN) {
@@ -188,7 +243,11 @@ private function traverseNode(Node $node) : bool
         }
 
         if ($traverseChildren) {
+            $this->ancestorStack[] = $node;
+            $this->currentDepth++;
             $this->traverseNodeChildren($node);
+            \array_pop($this->ancestorStack);
+            $this->currentDepth--;
         }
 
         foreach ($innerNodes as $innerNode) {
@@ -201,13 +260,13 @@ private function traverseNode(Node $node) : bool
                     if ($result === NodeVisitor::STOP_TRAVERSAL) {
                         $this->stopTraversal = true;
 
-                        return false;
+                        return null;
                     }
                 }
             }
         }
 
-        return true;
+        return $replacement;
     }
 
     private function traverseNodeChildren(Node $node) : void
diff --git a/src/lib/pg-query/src/Flow/PgQuery/DSL/functions.php b/src/lib/pg-query/src/Flow/PgQuery/DSL/functions.php
index 2425895e9..894cd2dcf 100644
--- a/src/lib/pg-query/src/Flow/PgQuery/DSL/functions.php
+++ b/src/lib/pg-query/src/Flow/PgQuery/DSL/functions.php
@@ -5,7 +5,9 @@
 namespace Flow\PgQuery\DSL;
 
 use Flow\ETL\Attribute\{DocumentationDSL, Module, Type as DSLType};
+use Flow\PgQuery\AST\Transformers\{CountModifier, KeysetColumn, KeysetPaginationConfig, KeysetPaginationModifier, PaginationConfig, PaginationModifier, SortOrder};
 use Flow\PgQuery\{DeparseOptions, ParsedQuery, Parser};
+use Flow\PgQuery\Extractors\{Columns, Functions, Tables};
 
 #[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
 function pg_parser() : Parser
@@ -109,3 +111,167 @@ function pg_summary(string $sql, int $options = 0, int $truncateLimit = 0) : str
 {
     return (new Parser())->summary($sql, $options, $truncateLimit);
 }
+
+/**
+ * Transform a SQL query into a paginated query with LIMIT and OFFSET.
+ *
+ * @param string $sql The SQL query to paginate
+ * @param int $limit Maximum number of rows to return
+ * @param int $offset Number of rows to skip (requires ORDER BY in query)
+ *
+ * @return string The paginated SQL query
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_to_paginated_query(string $sql, int $limit, int $offset = 0) : string
+{
+    $query = (new Parser())->parse($sql);
+    $query->traverse(new PaginationModifier(new PaginationConfig($limit, $offset)));
+
+    return $query->deparse();
+}
+
+/**
+ * Transform a SQL query into a COUNT query for pagination.
+ *
+ * Wraps the query in: SELECT COUNT(*) FROM (...) AS _count_subq
+ * Removes ORDER BY and LIMIT/OFFSET from the inner query.
+ *
+ * @param string $sql The SQL query to transform
+ *
+ * @return string The COUNT query
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_to_count_query(string $sql) : string
+{
+    $query = (new Parser())->parse($sql);
+    $query->traverse(new CountModifier());
+
+    return $query->deparse();
+}
+
+/**
+ * Transform a SQL query into a keyset (cursor-based) paginated query.
+ *
+ * More efficient than OFFSET for large datasets - uses indexed WHERE conditions.
+ *
+ * @param string $sql The SQL query to paginate (must have ORDER BY)
+ * @param int $limit Maximum number of rows to return
+ * @param list<KeysetColumn> $columns Columns for keyset pagination (must match ORDER BY)
+ * @param null|list<null|bool|float|int|string> $cursor Values from last row of previous page (null for first page)
+ *
+ * @return string The paginated SQL query
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_to_keyset_query(string $sql, int $limit, array $columns, ?array $cursor = null) : string
+{
+    $query = (new Parser())->parse($sql);
+    $query->traverse(new KeysetPaginationModifier(new KeysetPaginationConfig($limit, $columns, $cursor)));
+
+    return $query->deparse();
+}
+
+/**
+ * Create a PaginationConfig for offset-based pagination.
+ *
+ * @param int $limit Maximum number of rows to return
+ * @param int $offset Number of rows to skip (requires ORDER BY in query)
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_pagination_config(int $limit, int $offset = 0) : PaginationConfig
+{
+    return new PaginationConfig($limit, $offset);
+}
+
+/**
+ * Create a PaginationModifier for offset-based pagination.
+ *
+ * Applies LIMIT and OFFSET to the query. OFFSET without ORDER BY will throw an exception.
+ *
+ * @param int $limit Maximum number of rows to return
+ * @param int $offset Number of rows to skip (requires ORDER BY in query)
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_pagination(int $limit, int $offset = 0) : PaginationModifier
+{
+    return new PaginationModifier(new PaginationConfig($limit, $offset));
+}
+
+/**
+ * Create a CountModifier that transforms a SELECT query into a COUNT query.
+ *
+ * The original query is wrapped in: SELECT COUNT(*) FROM (...) AS _count_subq
+ * ORDER BY and LIMIT/OFFSET are removed from the inner query.
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_count_modifier() : CountModifier
+{
+    return new CountModifier();
+}
+
+/**
+ * Create a KeysetColumn for keyset pagination.
+ *
+ * @param string $column Column name (can include table alias like "u.id")
+ * @param SortOrder $order Sort order (ASC or DESC)
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_keyset_column(string $column, SortOrder $order = SortOrder::ASC) : KeysetColumn
+{
+    return new KeysetColumn($column, $order);
+}
+
+/**
+ * Create a KeysetPaginationConfig for cursor-based pagination.
+ *
+ * @param int $limit Maximum number of rows to return
+ * @param list<KeysetColumn> $columns Columns to use for keyset pagination (must match ORDER BY)
+ * @param null|list<null|bool|float|int|string> $cursor Cursor values from the last row of previous page (null for first page)
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_keyset_pagination_config(int $limit, array $columns, ?array $cursor = null) : KeysetPaginationConfig
+{
+    return new KeysetPaginationConfig($limit, $columns, $cursor);
+}
+
+/**
+ * Create a KeysetPaginationModifier for cursor-based pagination.
+ *
+ * Keyset pagination is more efficient than OFFSET for large datasets because it uses
+ * indexed WHERE conditions instead of scanning and skipping rows.
+ *
+ * @param int $limit Maximum number of rows to return
+ * @param list<KeysetColumn> $columns Columns to use for keyset pagination (must match ORDER BY)
+ * @param null|list<null|bool|float|int|string> $cursor Cursor values from the last row of previous page (null for first page)
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_keyset_pagination(int $limit, array $columns, ?array $cursor = null) : KeysetPaginationModifier
+{
+    return new KeysetPaginationModifier(new KeysetPaginationConfig($limit, $columns, $cursor));
+}
+
+/**
+ * Extract columns from a parsed SQL query.
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_query_columns(ParsedQuery $query) : Columns
+{
+    return new Columns($query);
+}
+
+/**
+ * Extract tables from a parsed SQL query.
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_query_tables(ParsedQuery $query) : Tables
+{
+    return new Tables($query);
+}
+
+/**
+ * Extract functions from a parsed SQL query.
+ */
+#[DocumentationDSL(module: Module::PG_QUERY, type: DSLType::HELPER)]
+function pg_query_functions(ParsedQuery $query) : Functions
+{
+    return new Functions($query);
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/Exception/PaginationException.php b/src/lib/pg-query/src/Flow/PgQuery/Exception/PaginationException.php
new file mode 100644
index 000000000..2c17cadaa
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/Exception/PaginationException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Exception;
+
+final class PaginationException extends TransformationException
+{
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/Exception/TransformationException.php b/src/lib/pg-query/src/Flow/PgQuery/Exception/TransformationException.php
new file mode 100644
index 000000000..28ca1b621
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/Exception/TransformationException.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Exception;
+
+class TransformationException extends \RuntimeException
+{
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/Extractors/Columns.php b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Columns.php
new file mode 100644
index 000000000..c85b5763a
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Columns.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Extractors;
+
+use Flow\PgQuery\AST\Nodes\Column;
+use Flow\PgQuery\AST\Visitors\ColumnRefCollector;
+use Flow\PgQuery\ParsedQuery;
+
+final readonly class Columns
+{
+    public function __construct(private ParsedQuery $query)
+    {
+    }
+
+    /**
+     * @return array<Column>
+     */
+    public function all() : array
+    {
+        $collector = new ColumnRefCollector();
+        $this->query->traverse($collector);
+
+        return \array_values(\array_filter(
+            \array_map(static fn ($ref) => new Column($ref), $collector->getColumnRefs()),
+            static fn ($col) => $col->name() !== null
+        ));
+    }
+
+    /**
+     * @return array<Column>
+     */
+    public function forTable(string $tableName) : array
+    {
+        return \array_values(\array_filter(
+            $this->all(),
+            static fn ($col) => $col->table() === $tableName
+        ));
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/Extractors/Functions.php b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Functions.php
new file mode 100644
index 000000000..76ec335e6
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Functions.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Extractors;
+
+use Flow\PgQuery\AST\Nodes\FunctionCall;
+use Flow\PgQuery\AST\Visitors\FuncCallCollector;
+use Flow\PgQuery\ParsedQuery;
+
+final readonly class Functions
+{
+    public function __construct(private ParsedQuery $query)
+    {
+    }
+
+    /**
+     * @return array<FunctionCall>
+     */
+    public function all() : array
+    {
+        $collector = new FuncCallCollector();
+        $this->query->traverse($collector);
+
+        return \array_values(\array_filter(
+            \array_map(static fn ($ref) => new FunctionCall($ref), $collector->getFuncCalls()),
+            static fn ($func) => $func->name() !== null
+        ));
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/Extractors/Tables.php b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Tables.php
new file mode 100644
index 000000000..bf6560b49
--- /dev/null
+++ b/src/lib/pg-query/src/Flow/PgQuery/Extractors/Tables.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Extractors;
+
+use Flow\PgQuery\AST\Nodes\Table;
+use Flow\PgQuery\AST\Visitors\RangeVarCollector;
+use Flow\PgQuery\ParsedQuery;
+
+final readonly class Tables
+{
+    public function __construct(private ParsedQuery $query)
+    {
+    }
+
+    /**
+     * @return array<Table>
+     */
+    public function all() : array
+    {
+        $collector = new RangeVarCollector();
+        $this->query->traverse($collector);
+
+        return \array_values(\array_filter(
+            \array_map(static fn ($ref) => new Table($ref), $collector->getRangeVars()),
+            static fn ($table) => $table->name() !== ''
+        ));
+    }
+}
diff --git a/src/lib/pg-query/src/Flow/PgQuery/ParsedQuery.php b/src/lib/pg-query/src/Flow/PgQuery/ParsedQuery.php
index 72dd89890..2b49cc7e0 100644
--- a/src/lib/pg-query/src/Flow/PgQuery/ParsedQuery.php
+++ b/src/lib/pg-query/src/Flow/PgQuery/ParsedQuery.php
@@ -4,9 +4,7 @@
 
 namespace Flow\PgQuery;
 
-use Flow\PgQuery\AST\Nodes\{Column, FunctionCall, Table};
-use Flow\PgQuery\AST\{NodeVisitor, Traverser};
-use Flow\PgQuery\AST\Visitors\{ColumnRefCollector, FuncCallCollector, RangeVarCollector};
+use Flow\PgQuery\AST\{NodeModifier, NodeVisitor, Traverser};
 use Flow\PgQuery\Protobuf\AST\ParseResult;
 
 final readonly class ParsedQuery
@@ -16,34 +14,6 @@ public function __construct(
     ) {
     }
 
-    /**
-     * @return array<Column>
-     */
-    public function columns(?string $tableName = null) : array
-    {
-        $collector = new ColumnRefCollector();
-        $traverser = new Traverser($collector);
-        $traverser->traverse($this->parseResult);
-
-        $columns = [];
-
-        foreach ($collector->getColumnRefs() as $columnRef) {
-            $column = new Column($columnRef);
-
-            if ($column->name() === null) {
-                continue;
-            }
-
-            if ($tableName !== null && $column->table() !== $tableName) {
-                continue;
-            }
-
-            $columns[] = $column;
-        }
-
-        return $columns;
-    }
-
     /**
      * Convert the parsed AST back to SQL string.
      *
@@ -68,62 +38,22 @@ public function deparse(?DeparseOptions $options = null) : string
         );
     }
 
-    /**
-     * @return array<FunctionCall>
-     */
-    public function functions() : array
-    {
-        $collector = new FuncCallCollector();
-        $traverser = new Traverser($collector);
-        $traverser->traverse($this->parseResult);
-
-        $functions = [];
-
-        foreach ($collector->getFuncCalls() as $funcCall) {
-            $function = new FunctionCall($funcCall);
-
-            if ($function->name() === null) {
-                continue;
-            }
-
-            $functions[] = $function;
-        }
-
-        return $functions;
-    }
-
     public function raw() : ParseResult
     {
         return $this->parseResult;
     }
 
     /**
-     * @return array<Table>
+     * Traverse the AST with visitors and/or modifiers.
+     *
+     * Visitors collect information (read-only), modifiers mutate nodes.
+     * Returns $this to allow method chaining.
      */
-    public function tables() : array
+    public function traverse(NodeVisitor|NodeModifier ...$handlers) : self
     {
-        $collector = new RangeVarCollector();
-        $traverser = new Traverser($collector);
+        $traverser = new Traverser(...$handlers);
         $traverser->traverse($this->parseResult);
 
-        $tables = [];
-
-        foreach ($collector->getRangeVars() as $rangeVar) {
-            $table = new Table($rangeVar);
-
-            if ($table->name() === '') {
-                continue;
-            }
-
-            $tables[] = $table;
-        }
-
-        return $tables;
-    }
-
-    public function traverse(NodeVisitor ...$visitors) : void
-    {
-        $traverser = new Traverser(...$visitors);
-        $traverser->traverse($this->parseResult);
+        return $this;
     }
 }
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierEdgeCasesTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierEdgeCasesTest.php
new file mode 100644
index 000000000..dce41bfed
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierEdgeCasesTest.php
@@ -0,0 +1,216 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\{pg_to_count_query, pg_to_paginated_query};
+
+use PHPUnit\Framework\TestCase;
+
+final class CountModifierEdgeCasesTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_complete_paginator_pattern() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                p.id,
+                p.name,
+                p.price,
+                c.name AS category_name
+            FROM products p
+            JOIN categories c ON p.category_id = c.id
+            WHERE p.active = true
+                AND p.price >= 10
+            ORDER BY p.name ASC, p.id
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT p.id, p.name, p.price, c.name AS category_name FROM products p JOIN categories c ON p.category_id = c.id WHERE p.active = true AND p.price >= 10) _count_subq',
+            $countQuery
+        );
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 25, offset: 0);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, c.name AS category_name FROM products p JOIN categories c ON p.category_id = c.id WHERE p.active = true AND p.price >= 10 ORDER BY p.name ASC, p.id LIMIT 25',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 25, offset: 25);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, c.name AS category_name FROM products p JOIN categories c ON p.category_id = c.id WHERE p.active = true AND p.price >= 10 ORDER BY p.name ASC, p.id LIMIT 25 OFFSET 25',
+            $page2
+        );
+    }
+
+    public function test_count_with_aggregation() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                category_id,
+                COUNT(*) AS product_count,
+                AVG(price) AS avg_price
+            FROM products
+            WHERE active = true
+            GROUP BY category_id
+            HAVING COUNT(*) >= 5
+            ORDER BY product_count DESC
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT category_id, count(*) AS product_count, avg(price) AS avg_price FROM products WHERE active = true GROUP BY category_id HAVING count(*) >= 5) _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_complex_joins() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                o.id,
+                o.total_amount,
+                u.email,
+                p.name AS product_name
+            FROM orders o
+            JOIN users u ON o.user_id = u.id
+            JOIN order_items oi ON o.id = oi.order_id
+            JOIN products p ON oi.product_id = p.id
+            WHERE o.status = 'completed'
+                AND o.created_at >= '2025-01-01'
+            ORDER BY o.created_at DESC, o.id
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT o.id, o.total_amount, u.email, p.name AS product_name FROM orders o JOIN users u ON o.user_id = u.id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' AND o.created_at >= \'2025-01-01\') _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_cte() : void
+    {
+        $baseQuery = <<<'SQL'
+            WITH active_customers AS (
+                SELECT DISTINCT u.id, u.email
+                FROM users u
+                JOIN orders o ON u.id = o.user_id
+                WHERE o.created_at >= NOW() - INTERVAL '30 days'
+            )
+            SELECT ac.id, ac.email, COUNT(o.id) AS order_count
+            FROM active_customers ac
+            JOIN orders o ON ac.id = o.user_id
+            GROUP BY ac.id, ac.email
+            ORDER BY order_count DESC
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (WITH active_customers AS (SELECT DISTINCT u.id, u.email FROM users u JOIN orders o ON u.id = o.user_id WHERE o.created_at >= (now() - \'30 days\'::interval)) SELECT ac.id, ac.email, count(o.id) AS order_count FROM active_customers ac JOIN orders o ON ac.id = o.user_id GROUP BY ac.id, ac.email) _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_distinct() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT DISTINCT
+                u.id,
+                u.email,
+                u.name
+            FROM users u
+            JOIN orders o ON u.id = o.user_id
+            WHERE o.total_amount > 100
+            ORDER BY u.name
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT DISTINCT u.id, u.email, u.name FROM users u JOIN orders o ON u.id = o.user_id WHERE o.total_amount > 100) _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_subquery_in_where() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                p.id,
+                p.name,
+                p.price
+            FROM products p
+            WHERE p.category_id IN (
+                SELECT c.id
+                FROM categories c
+                WHERE c.active = true
+                    AND c.parent_id IS NOT NULL
+            )
+            AND p.price > (
+                SELECT AVG(price)
+                FROM products
+                WHERE active = true
+            )
+            ORDER BY p.price DESC
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT p.id, p.name, p.price FROM products p WHERE p.category_id IN (SELECT c.id FROM categories c WHERE c.active = true AND c.parent_id IS NOT NULL) AND p.price > (SELECT avg(price) FROM products WHERE active = true)) _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_union() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT id, 'order' AS notification_type, message FROM order_notifications WHERE read = false
+            UNION ALL
+            SELECT id, 'payment' AS notification_type, message FROM payment_notifications WHERE read = false
+            UNION ALL
+            SELECT id, 'shipping' AS notification_type, message FROM shipping_notifications WHERE read = false
+            ORDER BY id DESC
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM ((SELECT id, \'order\' AS notification_type, message FROM order_notifications WHERE read = false UNION ALL SELECT id, \'payment\' AS notification_type, message FROM payment_notifications WHERE read = false) UNION ALL SELECT id, \'shipping\' AS notification_type, message FROM shipping_notifications WHERE read = false) _count_subq',
+            $countQuery
+        );
+    }
+
+    public function test_count_with_window_functions() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                e.id,
+                e.name,
+                e.salary,
+                e.department_id,
+                RANK() OVER (PARTITION BY e.department_id ORDER BY e.salary DESC) AS dept_rank
+            FROM employees e
+            WHERE e.active = true
+            ORDER BY e.department_id, dept_rank
+            SQL;
+
+        $countQuery = pg_to_count_query($baseQuery);
+
+        self::assertSame(
+            'SELECT count(*) FROM (SELECT e.id, e.name, e.salary, e.department_id, rank() OVER (PARTITION BY e.department_id ORDER BY e.salary DESC) AS dept_rank FROM employees e WHERE e.active = true) _count_subq',
+            $countQuery
+        );
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierTest.php
new file mode 100644
index 000000000..cee32d28f
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/CountModifierTest.php
@@ -0,0 +1,128 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\{pg_count_modifier, pg_parse};
+use PHPUnit\Framework\TestCase;
+
+final class CountModifierTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_count_cte_query() : void
+    {
+        $parsed = pg_parse('WITH active AS (SELECT * FROM users WHERE active = true) SELECT * FROM active ORDER BY name');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (WITH active AS (SELECT * FROM users WHERE active = true) SELECT * FROM active) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_distinct_query() : void
+    {
+        $parsed = pg_parse('SELECT DISTINCT name FROM users');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT DISTINCT name FROM users) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_except_query() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users EXCEPT SELECT id FROM banned ORDER BY id');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT id FROM users EXCEPT SELECT id FROM banned) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_group_by_query() : void
+    {
+        $parsed = pg_parse('SELECT dept, COUNT(*) as cnt FROM users GROUP BY dept HAVING COUNT(*) > 5 ORDER BY dept');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT dept, count(*) AS cnt FROM users GROUP BY dept HAVING count(*) > 5) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_intersect_query() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users INTERSECT SELECT id FROM admins ORDER BY id');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT id FROM users INTERSECT SELECT id FROM admins) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_removes_order_by() : void
+    {
+        $parsed = pg_parse('SELECT id, name FROM users WHERE active = true ORDER BY name ASC, id DESC');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT id, name FROM users WHERE active = true) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_simple_select() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT * FROM users) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_strips_existing_limit_and_offset() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id LIMIT 100 OFFSET 50');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT * FROM users) _count_subq', $parsed->deparse());
+    }
+
+    public function test_count_union_query() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users UNION SELECT id FROM admins ORDER BY id');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT id FROM users UNION SELECT id FROM admins) _count_subq', $parsed->deparse());
+    }
+
+    public function test_subquery_in_from_clause_not_counted() : void
+    {
+        $parsed = pg_parse('SELECT * FROM (SELECT id FROM users) AS sub ORDER BY id');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT * FROM (SELECT id FROM users) sub) _count_subq', $parsed->deparse());
+    }
+
+    public function test_subquery_in_where_clause_not_counted() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users WHERE id IN (SELECT user_id FROM orders) ORDER BY id');
+
+        $modifier = pg_count_modifier();
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT count(*) FROM (SELECT * FROM users WHERE id IN (SELECT user_id FROM orders)) _count_subq', $parsed->deparse());
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationEdgeCasesTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationEdgeCasesTest.php
new file mode 100644
index 000000000..dcccdb7bb
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationEdgeCasesTest.php
@@ -0,0 +1,231 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\{pg_keyset_column, pg_to_keyset_query};
+
+use Flow\PgQuery\AST\Transformers\SortOrder;
+
+use PHPUnit\Framework\TestCase;
+
+final class KeysetPaginationEdgeCasesTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_audit_log_iteration() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                al.id,
+                al.event_type,
+                al.entity_type,
+                al.entity_id,
+                al.user_id,
+                al.ip_address,
+                al.changes,
+                al.created_at
+            FROM audit_log al
+            WHERE al.event_type IN ('create', 'update', 'delete')
+                AND al.created_at >= '2025-01-01'
+            ORDER BY al.created_at DESC, al.id DESC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('al.created_at', SortOrder::DESC),
+            pg_keyset_column('al.id', SortOrder::DESC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 1000, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT al.id, al.event_type, al.entity_type, al.entity_id, al.user_id, al.ip_address, al.changes, al.created_at FROM audit_log al WHERE al.event_type IN (\'create\', \'update\', \'delete\') AND al.created_at >= \'2025-01-01\' ORDER BY al.created_at DESC, al.id DESC LIMIT 1000',
+            $page1
+        );
+
+        $page100 = pg_to_keyset_query($baseQuery, limit: 1000, columns: $columns, cursor: ['2025-01-05 08:30:00', 50000]);
+        self::assertSame(
+            'SELECT al.id, al.event_type, al.entity_type, al.entity_id, al.user_id, al.ip_address, al.changes, al.created_at FROM audit_log al WHERE (al.event_type IN (\'create\', \'update\', \'delete\') AND al.created_at >= \'2025-01-01\') AND (al.created_at < $1 OR (al.created_at = $1 AND al.id < $2)) ORDER BY al.created_at DESC, al.id DESC LIMIT 1000',
+            $page100
+        );
+    }
+
+    public function test_iterate_through_pages() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                a.id,
+                a.user_id,
+                a.action_type,
+                a.metadata,
+                a.created_at
+            FROM activity_log a
+            ORDER BY a.created_at DESC, a.id DESC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('a.created_at', SortOrder::DESC),
+            pg_keyset_column('a.id', SortOrder::DESC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 50, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT a.id, a.user_id, a.action_type, a.metadata, a.created_at FROM activity_log a ORDER BY a.created_at DESC, a.id DESC LIMIT 50',
+            $page1
+        );
+
+        $page2 = pg_to_keyset_query($baseQuery, limit: 50, columns: $columns, cursor: ['2025-01-15 14:30:00', 1000]);
+        self::assertSame(
+            'SELECT a.id, a.user_id, a.action_type, a.metadata, a.created_at FROM activity_log a WHERE a.created_at < $1 OR (a.created_at = $1 AND a.id < $2) ORDER BY a.created_at DESC, a.id DESC LIMIT 50',
+            $page2
+        );
+
+        $page3 = pg_to_keyset_query($baseQuery, limit: 50, columns: $columns, cursor: ['2025-01-15 12:15:00', 850]);
+        self::assertSame(
+            'SELECT a.id, a.user_id, a.action_type, a.metadata, a.created_at FROM activity_log a WHERE a.created_at < $1 OR (a.created_at = $1 AND a.id < $2) ORDER BY a.created_at DESC, a.id DESC LIMIT 50',
+            $page3
+        );
+    }
+
+    public function test_with_complex_joins() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                o.id AS order_id,
+                o.created_at,
+                o.total_amount,
+                u.email AS customer_email,
+                p.name AS product_name
+            FROM orders o
+            JOIN users u ON o.user_id = u.id
+            JOIN order_items oi ON o.id = oi.order_id
+            JOIN products p ON oi.product_id = p.id
+            WHERE o.status = 'completed'
+            ORDER BY o.created_at DESC, o.id DESC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('o.created_at', SortOrder::DESC),
+            pg_keyset_column('o.id', SortOrder::DESC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 25, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT o.id AS order_id, o.created_at, o.total_amount, u.email AS customer_email, p.name AS product_name FROM orders o JOIN users u ON o.user_id = u.id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' ORDER BY o.created_at DESC, o.id DESC LIMIT 25',
+            $page1
+        );
+
+        $page2 = pg_to_keyset_query($baseQuery, limit: 25, columns: $columns, cursor: ['2025-01-10 09:45:00', 5000]);
+        self::assertSame(
+            'SELECT o.id AS order_id, o.created_at, o.total_amount, u.email AS customer_email, p.name AS product_name FROM orders o JOIN users u ON o.user_id = u.id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' AND (o.created_at < $1 OR (o.created_at = $1 AND o.id < $2)) ORDER BY o.created_at DESC, o.id DESC LIMIT 25',
+            $page2
+        );
+    }
+
+    public function test_with_existing_complex_where() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                p.id,
+                p.name,
+                p.price,
+                p.category_id,
+                p.created_at
+            FROM products p
+            WHERE p.active = true
+                AND p.price BETWEEN 50 AND 500
+                AND p.category_id IN (1, 2, 3, 4, 5)
+                AND p.stock_quantity > 0
+                AND (p.name ILIKE '%phone%' OR p.name ILIKE '%tablet%')
+            ORDER BY p.created_at DESC, p.id DESC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('p.created_at', SortOrder::DESC),
+            pg_keyset_column('p.id', SortOrder::DESC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 12, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, p.category_id, p.created_at FROM products p WHERE p.active = true AND p.price BETWEEN 50 AND 500 AND p.category_id IN (1, 2, 3, 4, 5) AND p.stock_quantity > 0 AND (p.name ILIKE \'%phone%\' OR p.name ILIKE \'%tablet%\') ORDER BY p.created_at DESC, p.id DESC LIMIT 12',
+            $page1
+        );
+
+        $page2 = pg_to_keyset_query($baseQuery, limit: 12, columns: $columns, cursor: ['2025-01-10 15:00:00', 750]);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, p.category_id, p.created_at FROM products p WHERE (p.active = true AND p.price BETWEEN 50 AND 500 AND p.category_id IN (1, 2, 3, 4, 5) AND p.stock_quantity > 0 AND (p.name ILIKE \'%phone%\' OR p.name ILIKE \'%tablet%\')) AND (p.created_at < $1 OR (p.created_at = $1 AND p.id < $2)) ORDER BY p.created_at DESC, p.id DESC LIMIT 12',
+            $page2
+        );
+    }
+
+    public function test_with_mixed_sort_orders() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                t.id,
+                t.title,
+                t.priority,
+                t.created_at,
+                t.status
+            FROM tickets t
+            WHERE t.status != 'closed'
+            ORDER BY t.priority DESC, t.created_at ASC, t.id ASC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('t.priority', SortOrder::DESC),
+            pg_keyset_column('t.created_at', SortOrder::ASC),
+            pg_keyset_column('t.id', SortOrder::ASC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 20, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT t.id, t.title, t.priority, t.created_at, t.status FROM tickets t WHERE t.status <> \'closed\' ORDER BY t.priority DESC, t.created_at ASC, t.id ASC LIMIT 20',
+            $page1
+        );
+
+        $page2 = pg_to_keyset_query($baseQuery, limit: 20, columns: $columns, cursor: [5, '2025-01-01 10:00:00', 100]);
+        self::assertSame(
+            'SELECT t.id, t.title, t.priority, t.created_at, t.status FROM tickets t WHERE t.status <> \'closed\' AND (t.priority < $1 OR (t.priority = $1 AND t.created_at > $2) OR (t.priority = $1 AND t.created_at = $2 AND t.id > $3)) ORDER BY t.priority DESC, t.created_at ASC, t.id ASC LIMIT 20',
+            $page2
+        );
+    }
+
+    public function test_with_window_functions() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                e.id,
+                e.name,
+                e.department_id,
+                e.salary,
+                RANK() OVER (PARTITION BY e.department_id ORDER BY e.salary DESC) AS salary_rank,
+                e.hire_date
+            FROM employees e
+            WHERE e.active = true
+            ORDER BY e.hire_date DESC, e.id DESC
+            SQL;
+
+        $columns = [
+            pg_keyset_column('e.hire_date', SortOrder::DESC),
+            pg_keyset_column('e.id', SortOrder::DESC),
+        ];
+
+        $page1 = pg_to_keyset_query($baseQuery, limit: 30, columns: $columns, cursor: null);
+        self::assertSame(
+            'SELECT e.id, e.name, e.department_id, e.salary, rank() OVER (PARTITION BY e.department_id ORDER BY e.salary DESC) AS salary_rank, e.hire_date FROM employees e WHERE e.active = true ORDER BY e.hire_date DESC, e.id DESC LIMIT 30',
+            $page1
+        );
+
+        $page2 = pg_to_keyset_query($baseQuery, limit: 30, columns: $columns, cursor: ['2024-06-15', 500]);
+        self::assertSame(
+            'SELECT e.id, e.name, e.department_id, e.salary, rank() OVER (PARTITION BY e.department_id ORDER BY e.salary DESC) AS salary_rank, e.hire_date FROM employees e WHERE e.active = true AND (e.hire_date < $1 OR (e.hire_date = $1 AND e.id < $2)) ORDER BY e.hire_date DESC, e.id DESC LIMIT 30',
+            $page2
+        );
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationModifierTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationModifierTest.php
new file mode 100644
index 000000000..f8cdf6a52
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/KeysetPaginationModifierTest.php
@@ -0,0 +1,220 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\{pg_keyset_column, pg_keyset_pagination, pg_keyset_pagination_config, pg_parse};
+use Flow\PgQuery\AST\Transformers\SortOrder;
+use Flow\PgQuery\Exception\PaginationException;
+use PHPUnit\Framework\TestCase;
+
+final class KeysetPaginationModifierTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_first_page_multiple_columns() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY created_at, id');
+
+        $modifier = pg_keyset_pagination(10, [
+            pg_keyset_column('created_at', SortOrder::ASC),
+            pg_keyset_column('id', SortOrder::ASC),
+        ]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY created_at, id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_first_page_single_column_asc() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::ASC)]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_first_page_single_column_desc() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id DESC');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::DESC)]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY id DESC LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_keyset_pagination_config_default_cursor() : void
+    {
+        $columns = [pg_keyset_column('id', SortOrder::ASC)];
+
+        $config = pg_keyset_pagination_config(20, $columns);
+
+        self::assertSame(20, $config->limit);
+        self::assertSame($columns, $config->columns);
+        self::assertNull($config->cursor);
+    }
+
+    public function test_keyset_pagination_config_returns_config_object() : void
+    {
+        $columns = [
+            pg_keyset_column('created_at', SortOrder::ASC),
+            pg_keyset_column('id', SortOrder::ASC),
+        ];
+        $cursor = ['2025-01-15', 42];
+
+        $config = pg_keyset_pagination_config(10, $columns, $cursor);
+
+        self::assertSame(10, $config->limit);
+        self::assertSame($columns, $config->columns);
+        self::assertSame($cursor, $config->cursor);
+    }
+
+    public function test_qualified_column_names() : void
+    {
+        $parsed = pg_parse('SELECT u.* FROM users u ORDER BY u.id');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('u.id', SortOrder::ASC)], [42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT u.* FROM users u WHERE u.id > $1 ORDER BY u.id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_subquery_not_modified() : void
+    {
+        $parsed = pg_parse('SELECT * FROM (SELECT id FROM users ORDER BY id) AS sub ORDER BY id');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::ASC)], [42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame(
+            'SELECT * FROM (SELECT id FROM users ORDER BY id) sub WHERE id > $1 ORDER BY id LIMIT 10',
+            $parsed->deparse()
+        );
+    }
+
+    public function test_subsequent_page_multiple_columns_all_asc() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY created_at, id');
+
+        $modifier = pg_keyset_pagination(10, [
+            pg_keyset_column('created_at', SortOrder::ASC),
+            pg_keyset_column('id', SortOrder::ASC),
+        ], ['2025-01-15 12:30:00', 42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame(
+            'SELECT * FROM users WHERE created_at > $1 OR (created_at = $1 AND id > $2) ORDER BY created_at, id LIMIT 10',
+            $parsed->deparse()
+        );
+    }
+
+    public function test_subsequent_page_multiple_columns_mixed_order() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY created_at ASC, id DESC');
+
+        $modifier = pg_keyset_pagination(10, [
+            pg_keyset_column('created_at', SortOrder::ASC),
+            pg_keyset_column('id', SortOrder::DESC),
+        ], ['2025-01-15 12:30:00', 42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame(
+            'SELECT * FROM users WHERE created_at > $1 OR (created_at = $1 AND id < $2) ORDER BY created_at ASC, id DESC LIMIT 10',
+            $parsed->deparse()
+        );
+    }
+
+    public function test_subsequent_page_single_column_asc() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::ASC)], [42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users WHERE id > $1 ORDER BY id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_subsequent_page_single_column_desc() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id DESC');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::DESC)], [42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users WHERE id < $1 ORDER BY id DESC LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_subsequent_page_three_columns() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY status, created_at DESC, id');
+
+        $modifier = pg_keyset_pagination(10, [
+            pg_keyset_column('status', SortOrder::ASC),
+            pg_keyset_column('created_at', SortOrder::DESC),
+            pg_keyset_column('id', SortOrder::ASC),
+        ], ['active', '2025-01-15', 100]);
+        $parsed->traverse($modifier);
+
+        self::assertSame(
+            'SELECT * FROM users WHERE status > $1 OR (status = $1 AND created_at < $2) OR (status = $1 AND created_at = $2 AND id > $3) ORDER BY status, created_at DESC, id LIMIT 10',
+            $parsed->deparse()
+        );
+    }
+
+    public function test_throws_when_cursor_count_mismatch() : void
+    {
+        $this->expectException(PaginationException::class);
+        $this->expectExceptionMessage('Cursor values count (1) must match columns count (2)');
+
+        $parsed = pg_parse('SELECT * FROM users ORDER BY created_at, id');
+
+        $modifier = pg_keyset_pagination(10, [
+            pg_keyset_column('created_at', SortOrder::ASC),
+            pg_keyset_column('id', SortOrder::ASC),
+        ], [42]);
+        $parsed->traverse($modifier);
+    }
+
+    public function test_throws_when_no_columns() : void
+    {
+        $this->expectException(PaginationException::class);
+        $this->expectExceptionMessage('Keyset pagination requires at least one column');
+
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id');
+
+        $modifier = pg_keyset_pagination(10, []);
+        $parsed->traverse($modifier);
+    }
+
+    public function test_throws_when_no_order_by() : void
+    {
+        $this->expectException(PaginationException::class);
+        $this->expectExceptionMessage('Keyset pagination requires ORDER BY clause');
+
+        $parsed = pg_parse('SELECT * FROM users');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::ASC)]);
+        $parsed->traverse($modifier);
+    }
+
+    public function test_with_existing_where_clause() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users WHERE active = true ORDER BY id');
+
+        $modifier = pg_keyset_pagination(10, [pg_keyset_column('id', SortOrder::ASC)], [42]);
+        $parsed->traverse($modifier);
+
+        self::assertSame(
+            'SELECT * FROM users WHERE active = true AND id > $1 ORDER BY id LIMIT 10',
+            $parsed->deparse()
+        );
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/OffsetPaginationEdgeCasesTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/OffsetPaginationEdgeCasesTest.php
new file mode 100644
index 000000000..9a37aa8fe
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/OffsetPaginationEdgeCasesTest.php
@@ -0,0 +1,255 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\pg_to_paginated_query;
+
+use PHPUnit\Framework\TestCase;
+
+final class OffsetPaginationEdgeCasesTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_complex_aggregation_pagination() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                category_id,
+                COUNT(*) AS product_count,
+                AVG(price) AS avg_price,
+                MIN(price) AS min_price,
+                MAX(price) AS max_price
+            FROM products
+            WHERE active = true
+            GROUP BY category_id
+            HAVING COUNT(*) >= 5
+            ORDER BY product_count DESC, category_id
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 10, offset: 0);
+        self::assertSame(
+            'SELECT category_id, count(*) AS product_count, avg(price) AS avg_price, min(price) AS min_price, max(price) AS max_price FROM products WHERE active = true GROUP BY category_id HAVING count(*) >= 5 ORDER BY product_count DESC, category_id LIMIT 10',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 10, offset: 10);
+        self::assertSame(
+            'SELECT category_id, count(*) AS product_count, avg(price) AS avg_price, min(price) AS min_price, max(price) AS max_price FROM products WHERE active = true GROUP BY category_id HAVING count(*) >= 5 ORDER BY product_count DESC, category_id LIMIT 10 OFFSET 10',
+            $page2
+        );
+    }
+
+    public function test_iterate_cte_query() : void
+    {
+        $baseQuery = <<<'SQL'
+            WITH RECURSIVE org_tree AS (
+                SELECT id, name, manager_id, 1 AS level
+                FROM employees
+                WHERE manager_id IS NULL
+
+                UNION ALL
+
+                SELECT e.id, e.name, e.manager_id, ot.level + 1
+                FROM employees e
+                JOIN org_tree ot ON e.manager_id = ot.id
+            )
+            SELECT id, name, level
+            FROM org_tree
+            ORDER BY level, name
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 50, offset: 0);
+        self::assertSame(
+            'WITH RECURSIVE org_tree AS (SELECT id, name, manager_id, 1 AS level FROM employees WHERE manager_id IS NULL UNION ALL SELECT e.id, e.name, e.manager_id, ot.level + 1 FROM employees e JOIN org_tree ot ON e.manager_id = ot.id) SELECT id, name, level FROM org_tree ORDER BY level, name LIMIT 50',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 50, offset: 50);
+        self::assertSame(
+            'WITH RECURSIVE org_tree AS (SELECT id, name, manager_id, 1 AS level FROM employees WHERE manager_id IS NULL UNION ALL SELECT e.id, e.name, e.manager_id, ot.level + 1 FROM employees e JOIN org_tree ot ON e.manager_id = ot.id) SELECT id, name, level FROM org_tree ORDER BY level, name LIMIT 50 OFFSET 50',
+            $page2
+        );
+    }
+
+    public function test_iterate_through_pages_with_joins() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                u.id AS user_id,
+                u.email,
+                o.id AS order_id,
+                o.total_amount,
+                p.name AS product_name,
+                oi.quantity
+            FROM users u
+            JOIN orders o ON u.id = o.user_id
+            JOIN order_items oi ON o.id = oi.order_id
+            JOIN products p ON oi.product_id = p.id
+            WHERE o.status = 'completed'
+            ORDER BY o.created_at DESC, o.id
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 25, offset: 0);
+        self::assertSame(
+            'SELECT u.id AS user_id, u.email, o.id AS order_id, o.total_amount, p.name AS product_name, oi.quantity FROM users u JOIN orders o ON u.id = o.user_id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' ORDER BY o.created_at DESC, o.id LIMIT 25',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 25, offset: 25);
+        self::assertSame(
+            'SELECT u.id AS user_id, u.email, o.id AS order_id, o.total_amount, p.name AS product_name, oi.quantity FROM users u JOIN orders o ON u.id = o.user_id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' ORDER BY o.created_at DESC, o.id LIMIT 25 OFFSET 25',
+            $page2
+        );
+
+        $page3 = pg_to_paginated_query($baseQuery, limit: 25, offset: 50);
+        self::assertSame(
+            'SELECT u.id AS user_id, u.email, o.id AS order_id, o.total_amount, p.name AS product_name, oi.quantity FROM users u JOIN orders o ON u.id = o.user_id JOIN order_items oi ON o.id = oi.order_id JOIN products p ON oi.product_id = p.id WHERE o.status = \'completed\' ORDER BY o.created_at DESC, o.id LIMIT 25 OFFSET 50',
+            $page3
+        );
+    }
+
+    public function test_iterate_union_query() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT id, 'order' AS type, message, created_at FROM order_notifications
+            UNION ALL
+            SELECT id, 'payment' AS type, message, created_at FROM payment_notifications
+            UNION ALL
+            SELECT id, 'shipping' AS type, message, created_at FROM shipping_notifications
+            ORDER BY created_at DESC
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 20, offset: 0);
+        self::assertSame(
+            'SELECT * FROM ((SELECT id, \'order\' AS type, message, created_at FROM order_notifications UNION ALL SELECT id, \'payment\' AS type, message, created_at FROM payment_notifications) UNION ALL SELECT id, \'shipping\' AS type, message, created_at FROM shipping_notifications ORDER BY created_at DESC) _pagination_subq LIMIT 20',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 20, offset: 20);
+        self::assertSame(
+            'SELECT * FROM ((SELECT id, \'order\' AS type, message, created_at FROM order_notifications UNION ALL SELECT id, \'payment\' AS type, message, created_at FROM payment_notifications) UNION ALL SELECT id, \'shipping\' AS type, message, created_at FROM shipping_notifications ORDER BY created_at DESC) _pagination_subq LIMIT 20 OFFSET 20',
+            $page2
+        );
+    }
+
+    public function test_nested_cte_pagination() : void
+    {
+        $baseQuery = <<<'SQL'
+            WITH
+                active_users AS (
+                    SELECT id, name, email
+                    FROM users
+                    WHERE status = 'active'
+                ),
+                user_orders AS (
+                    SELECT
+                        au.id AS user_id,
+                        au.name,
+                        COUNT(o.id) AS order_count,
+                        SUM(o.total_amount) AS total_spent
+                    FROM active_users au
+                    LEFT JOIN orders o ON au.id = o.user_id
+                    GROUP BY au.id, au.name
+                )
+            SELECT user_id, name, order_count, total_spent
+            FROM user_orders
+            WHERE order_count > 0
+            ORDER BY total_spent DESC
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 15, offset: 0);
+        self::assertSame(
+            'WITH active_users AS (SELECT id, name, email FROM users WHERE status = \'active\'), user_orders AS (SELECT au.id AS user_id, au.name, count(o.id) AS order_count, sum(o.total_amount) AS total_spent FROM active_users au LEFT JOIN orders o ON au.id = o.user_id GROUP BY au.id, au.name) SELECT user_id, name, order_count, total_spent FROM user_orders WHERE order_count > 0 ORDER BY total_spent DESC LIMIT 15',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 15, offset: 15);
+        self::assertSame(
+            'WITH active_users AS (SELECT id, name, email FROM users WHERE status = \'active\'), user_orders AS (SELECT au.id AS user_id, au.name, count(o.id) AS order_count, sum(o.total_amount) AS total_spent FROM active_users au LEFT JOIN orders o ON au.id = o.user_id GROUP BY au.id, au.name) SELECT user_id, name, order_count, total_spent FROM user_orders WHERE order_count > 0 ORDER BY total_spent DESC LIMIT 15 OFFSET 15',
+            $page2
+        );
+    }
+
+    public function test_pagination_with_lateral_subquery() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                u.id,
+                u.name,
+                recent_orders.order_id,
+                recent_orders.amount
+            FROM users u,
+            LATERAL (
+                SELECT o.id AS order_id, o.total_amount AS amount
+                FROM orders o
+                WHERE o.user_id = u.id
+                ORDER BY o.created_at DESC
+                LIMIT 3
+            ) AS recent_orders
+            ORDER BY u.id
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 10, offset: 0);
+        self::assertSame(
+            'SELECT u.id, u.name, recent_orders.order_id, recent_orders.amount FROM users u, LATERAL (SELECT o.id AS order_id, o.total_amount AS amount FROM orders o WHERE o.user_id = u.id ORDER BY o.created_at DESC LIMIT 3) recent_orders ORDER BY u.id LIMIT 10',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 10, offset: 10);
+        self::assertSame(
+            'SELECT u.id, u.name, recent_orders.order_id, recent_orders.amount FROM users u, LATERAL (SELECT o.id AS order_id, o.total_amount AS amount FROM orders o WHERE o.user_id = u.id ORDER BY o.created_at DESC LIMIT 3) recent_orders ORDER BY u.id LIMIT 10 OFFSET 10',
+            $page2
+        );
+    }
+
+    public function test_product_catalog_with_filters() : void
+    {
+        $baseQuery = <<<'SQL'
+            SELECT
+                p.id,
+                p.name,
+                p.price,
+                c.name AS category_name,
+                b.name AS brand_name,
+                COALESCE(r.avg_rating, 0) AS rating
+            FROM products p
+            JOIN categories c ON p.category_id = c.id
+            JOIN brands b ON p.brand_id = b.id
+            LEFT JOIN (
+                SELECT product_id, AVG(rating) AS avg_rating
+                FROM reviews
+                GROUP BY product_id
+            ) r ON p.id = r.product_id
+            WHERE p.active = true
+                AND p.price BETWEEN 10 AND 100
+                AND c.slug IN ('electronics', 'computers')
+                AND p.stock_quantity > 0
+            ORDER BY r.avg_rating DESC NULLS LAST, p.name
+            SQL;
+
+        $page1 = pg_to_paginated_query($baseQuery, limit: 24, offset: 0);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, c.name AS category_name, b.name AS brand_name, COALESCE(r.avg_rating, 0) AS rating FROM products p JOIN categories c ON p.category_id = c.id JOIN brands b ON p.brand_id = b.id LEFT JOIN (SELECT product_id, avg(rating) AS avg_rating FROM reviews GROUP BY product_id) r ON p.id = r.product_id WHERE p.active = true AND p.price BETWEEN 10 AND 100 AND c.slug IN (\'electronics\', \'computers\') AND p.stock_quantity > 0 ORDER BY r.avg_rating DESC NULLS LAST, p.name LIMIT 24',
+            $page1
+        );
+
+        $page2 = pg_to_paginated_query($baseQuery, limit: 24, offset: 24);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, c.name AS category_name, b.name AS brand_name, COALESCE(r.avg_rating, 0) AS rating FROM products p JOIN categories c ON p.category_id = c.id JOIN brands b ON p.brand_id = b.id LEFT JOIN (SELECT product_id, avg(rating) AS avg_rating FROM reviews GROUP BY product_id) r ON p.id = r.product_id WHERE p.active = true AND p.price BETWEEN 10 AND 100 AND c.slug IN (\'electronics\', \'computers\') AND p.stock_quantity > 0 ORDER BY r.avg_rating DESC NULLS LAST, p.name LIMIT 24 OFFSET 24',
+            $page2
+        );
+
+        $page3 = pg_to_paginated_query($baseQuery, limit: 24, offset: 48);
+        self::assertSame(
+            'SELECT p.id, p.name, p.price, c.name AS category_name, b.name AS brand_name, COALESCE(r.avg_rating, 0) AS rating FROM products p JOIN categories c ON p.category_id = c.id JOIN brands b ON p.brand_id = b.id LEFT JOIN (SELECT product_id, avg(rating) AS avg_rating FROM reviews GROUP BY product_id) r ON p.id = r.product_id WHERE p.active = true AND p.price BETWEEN 10 AND 100 AND c.slug IN (\'electronics\', \'computers\') AND p.stock_quantity > 0 ORDER BY r.avg_rating DESC NULLS LAST, p.name LIMIT 24 OFFSET 48',
+            $page3
+        );
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/PaginationModifierTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/PaginationModifierTest.php
new file mode 100644
index 000000000..dc1823cd6
--- /dev/null
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/Transformers/PaginationModifierTest.php
@@ -0,0 +1,344 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Flow\PgQuery\Tests\Unit\AST\Transformers;
+
+use function Flow\PgQuery\DSL\{pg_pagination, pg_pagination_config, pg_parse};
+use Flow\PgQuery\AST\Traverser;
+use Flow\PgQuery\Exception\PaginationException;
+use PHPUnit\Framework\TestCase;
+
+final class PaginationModifierTest extends TestCase
+{
+    protected function setUp() : void
+    {
+        if (!\extension_loaded('pg_query')) {
+            self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
+        }
+    }
+
+    public function test_add_pagination_to_simple_select() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id');
+
+        $modifier = pg_pagination(10, 5);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM users ORDER BY id LIMIT 10 OFFSET 5', $parsed->deparse());
+    }
+
+    public function test_add_pagination_without_offset() : void
+    {
+        $parsed = pg_parse('SELECT id, name FROM users WHERE active = true');
+
+        $modifier = pg_pagination(20);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT id, name FROM users WHERE active = true LIMIT 20', $parsed->deparse());
+    }
+
+    public function test_clears_existing_offset_when_new_offset_is_zero() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users LIMIT 100 OFFSET 50');
+
+        $modifier = pg_pagination(10, 0);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_cte_main_query_gets_paginated() : void
+    {
+        $parsed = pg_parse('WITH active AS (SELECT * FROM users WHERE active = true) SELECT * FROM active');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('WITH active AS (SELECT * FROM users WHERE active = true) SELECT * FROM active LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_deeply_nested_subqueries() : void
+    {
+        $parsed = pg_parse('SELECT * FROM (SELECT * FROM (SELECT id FROM users) AS inner1) AS outer1');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM (SELECT * FROM (SELECT id FROM users) inner1) outer1 LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_distinct_query() : void
+    {
+        $parsed = pg_parse('SELECT DISTINCT name FROM users');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT DISTINCT name FROM users LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_except_query_wraps_in_subquery() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users EXCEPT SELECT id FROM banned');
+
+        $modifier = pg_pagination(15);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM (SELECT id FROM users EXCEPT SELECT id FROM banned) _pagination_subq LIMIT 15', $parsed->deparse());
+    }
+
+    public function test_group_by_having_query() : void
+    {
+        $parsed = pg_parse('SELECT dept, COUNT(*) as cnt FROM users GROUP BY dept HAVING COUNT(*) > 5');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT dept, count(*) AS cnt FROM users GROUP BY dept HAVING count(*) > 5 LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_inner_join() : void
+    {
+        $parsed = pg_parse('SELECT u.id, o.amount FROM users u INNER JOIN orders o ON u.id = o.user_id');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT u.id, o.amount FROM users u JOIN orders o ON u.id = o.user_id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_intersect_query_wraps_in_subquery() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users INTERSECT SELECT id FROM admins ORDER BY id');
+
+        $modifier = pg_pagination(5, 2);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM (SELECT id FROM users INTERSECT SELECT id FROM admins ORDER BY id) _pagination_subq LIMIT 5 OFFSET 2', $parsed->deparse());
+    }
+
+    public function test_lateral_join() : void
+    {
+        $parsed = pg_parse('SELECT u.id, latest.amount FROM users u, LATERAL (SELECT amount FROM orders WHERE user_id = u.id ORDER BY created_at DESC LIMIT 1) AS latest');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT u.id, latest.amount FROM users u, LATERAL (SELECT amount FROM orders WHERE user_id = u.id ORDER BY created_at DESC LIMIT 1) latest LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_left_join() : void
+    {
+        $parsed = pg_parse('SELECT u.id, o.amount FROM users u LEFT JOIN orders o ON u.id = o.user_id');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT u.id, o.amount FROM users u LEFT JOIN orders o ON u.id = o.user_id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_multiple_joins() : void
+    {
+        $parsed = pg_parse('SELECT u.id, o.amount, p.name FROM users u JOIN orders o ON u.id = o.user_id JOIN products p ON o.product_id = p.id');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT u.id, o.amount, p.name FROM users u JOIN orders o ON u.id = o.user_id JOIN products p ON o.product_id = p.id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_nested_union() : void
+    {
+        $parsed = pg_parse('(SELECT id FROM users UNION SELECT id FROM admins) UNION SELECT id FROM guests');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM ((SELECT id FROM users UNION SELECT id FROM admins) UNION SELECT id FROM guests) _pagination_subq LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_offset_with_order_by_works() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY name ASC');
+
+        $modifier = pg_pagination(10, 20);
+
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY name ASC LIMIT 10 OFFSET 20', $parsed->deparse());
+    }
+
+    public function test_offset_without_order_by_throws_exception() : void
+    {
+        $this->expectException(PaginationException::class);
+        $this->expectExceptionMessage('OFFSET without ORDER BY produces non-deterministic results');
+
+        $parsed = pg_parse('SELECT * FROM users');
+
+        $modifier = pg_pagination(10, 5);
+
+        $parsed->traverse($modifier);
+    }
+
+    public function test_order_by_query() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY name ASC');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM users ORDER BY name ASC LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_overrides_existing_limit() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users LIMIT 100');
+
+        $modifier = pg_pagination(10);
+
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_overrides_existing_limit_and_offset() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id LIMIT 100 OFFSET 50');
+
+        $modifier = pg_pagination(10, 5);
+
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY id LIMIT 10 OFFSET 5', $parsed->deparse());
+    }
+
+    public function test_pagination_config_default_offset() : void
+    {
+        $config = pg_pagination_config(20);
+
+        self::assertSame(20, $config->limit);
+        self::assertSame(0, $config->offset);
+    }
+
+    public function test_pagination_config_returns_config_object() : void
+    {
+        $config = pg_pagination_config(10, 5);
+
+        self::assertSame(10, $config->limit);
+        self::assertSame(5, $config->offset);
+    }
+
+    public function test_self_join() : void
+    {
+        $parsed = pg_parse('SELECT e.name AS employee, m.name AS manager FROM employees e LEFT JOIN employees m ON e.manager_id = m.id');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT e.name AS employee, m.name AS manager FROM employees e LEFT JOIN employees m ON e.manager_id = m.id LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_subquery_in_from_clause_not_paginated() : void
+    {
+        $parsed = pg_parse('SELECT * FROM (SELECT id FROM users) AS sub');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM (SELECT id FROM users) sub LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_subquery_in_where_clause_not_paginated() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users WHERE id IN (SELECT user_id FROM orders)');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM users WHERE id IN (SELECT user_id FROM orders) LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_union_all() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users UNION ALL SELECT id FROM admins');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM (SELECT id FROM users UNION ALL SELECT id FROM admins) _pagination_subq LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_union_query_wraps_in_subquery() : void
+    {
+        $parsed = pg_parse('SELECT id FROM users UNION SELECT id FROM admins');
+
+        $modifier = pg_pagination(10);
+
+        $traverser = new Traverser($modifier);
+        $traverser->traverse($parsed->raw());
+
+        self::assertSame('SELECT * FROM (SELECT id FROM users UNION SELECT id FROM admins) _pagination_subq LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_values_clause() : void
+    {
+        $parsed = pg_parse('SELECT * FROM (VALUES (1, \'a\'), (2, \'b\'), (3, \'c\')) AS t(id, name)');
+
+        $modifier = pg_pagination(2);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM (VALUES (1, \'a\'), (2, \'b\'), (3, \'c\')) t(id, name) LIMIT 2', $parsed->deparse());
+    }
+
+    public function test_window_function() : void
+    {
+        $parsed = pg_parse('SELECT id, name, ROW_NUMBER() OVER (ORDER BY created_at) as rn FROM users');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT id, name, row_number() OVER (ORDER BY created_at) AS rn FROM users LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_window_function_with_partition() : void
+    {
+        $parsed = pg_parse('SELECT id, dept, RANK() OVER (PARTITION BY dept ORDER BY salary DESC) as rank FROM employees');
+
+        $modifier = pg_pagination(10);
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT id, dept, rank() OVER (PARTITION BY dept ORDER BY salary DESC) AS rank FROM employees LIMIT 10', $parsed->deparse());
+    }
+
+    public function test_with_pagination_helper_method() : void
+    {
+        $parsed = pg_parse('SELECT * FROM users ORDER BY id');
+
+        $modifier = pg_pagination(25, 50);
+
+        $parsed->traverse($modifier);
+
+        self::assertSame('SELECT * FROM users ORDER BY id LIMIT 25 OFFSET 50', $parsed->deparse());
+    }
+}
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/TraverserTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/TraverserTest.php
index 2123f012b..19b60360c 100644
--- a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/TraverserTest.php
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/AST/TraverserTest.php
@@ -4,9 +4,9 @@
 
 namespace Flow\PgQuery\Tests\Unit\AST;
 
-use Flow\PgQuery\AST\{NodeVisitor, Traverser};
+use Flow\PgQuery\AST\{ModificationContext, NodeModifier, NodeVisitor, Traverser};
 use Flow\PgQuery\AST\Visitors\{ColumnRefCollector, FuncCallCollector, RangeVarCollector};
-use Flow\PgQuery\Protobuf\AST\{ColumnRef, ParseResult, SelectStmt};
+use Flow\PgQuery\Protobuf\AST\{ColumnRef, Node, ParseResult, SelectStmt};
 use PHPUnit\Framework\TestCase;
 
 final class TraverserTest extends TestCase
@@ -155,6 +155,218 @@ public function test_func_call_collector_with_schema() : void
         self::assertCount(2, $funcname);
     }
 
+    public function test_modifier_can_mutate_node_in_place() : void
+    {
+        $modifier = new class implements NodeModifier {
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : int|object|null
+            {
+                /** @var SelectStmt $node */
+                if ($context->isTopLevel()) {
+                    $integer = new \Flow\PgQuery\Protobuf\AST\Integer();
+                    $integer->setIval(10);
+
+                    $aConst = new \Flow\PgQuery\Protobuf\AST\A_Const();
+                    /** @phpstan-ignore argument.type */
+                    $aConst->setIval($integer);
+
+                    $limitNode = new Node();
+                    $limitNode->setAConst($aConst);
+
+                    $node->setLimitOption(\Flow\PgQuery\Protobuf\AST\LimitOption::LIMIT_OPTION_COUNT);
+                    $node->setLimitCount($limitNode);
+                }
+
+                return null;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM users');
+        $traverser->traverse($result);
+
+        $deparsed = \pg_query_deparse($result->serializeToString());
+
+        self::assertStringContainsString('LIMIT 10', $deparsed);
+    }
+
+    public function test_modifier_can_skip_children() : void
+    {
+        $modifyCount = 0;
+
+        $modifier = new class($modifyCount) implements NodeModifier {
+            private int $count;
+
+            public function __construct(int &$count)
+            {
+                $this->count = &$count;
+            }
+
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : int
+            {
+                $this->count++;
+
+                return NodeModifier::DONT_TRAVERSE_CHILDREN;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM (SELECT id FROM users) sub');
+        $traverser->traverse($result);
+
+        self::assertSame(1, $modifyCount);
+    }
+
+    public function test_modifier_can_stop_traversal() : void
+    {
+        $modifyCount = 0;
+
+        $modifier = new class($modifyCount) implements NodeModifier {
+            private int $count;
+
+            public function __construct(int &$count)
+            {
+                $this->count = &$count;
+            }
+
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : int
+            {
+                $this->count++;
+
+                return NodeModifier::STOP_TRAVERSAL;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM (SELECT id FROM users) sub');
+        $traverser->traverse($result);
+
+        self::assertSame(1, $modifyCount);
+    }
+
+    public function test_modifier_is_top_level_check() : void
+    {
+        /** @var array<bool> $topLevelResults */
+        $topLevelResults = [];
+
+        $modifier = new class($topLevelResults) implements NodeModifier {
+            /**
+             * @param array<bool> $results
+             *
+             * @phpstan-ignore property.onlyWritten (accessed via reference)
+             */
+            public function __construct(private array &$results)
+            {
+            }
+
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : null
+            {
+                $this->results[] = $context->isTopLevel();
+
+                return null;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM (SELECT id FROM users) sub');
+        $traverser->traverse($result);
+
+        self::assertContains(true, $topLevelResults);
+        self::assertContains(false, $topLevelResults);
+    }
+
+    public function test_modifier_receives_context_with_nested_depth() : void
+    {
+        /** @var array<int> $depths */
+        $depths = [];
+
+        $modifier = new class($depths) implements NodeModifier {
+            /**
+             * @param array<int> $depths
+             *
+             * @phpstan-ignore property.onlyWritten (accessed via reference)
+             */
+            public function __construct(private array &$depths)
+            {
+            }
+
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : null
+            {
+                $this->depths[] = $context->depth();
+
+                return null;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM (SELECT id FROM users) sub');
+        $traverser->traverse($result);
+
+        self::assertCount(2, $depths);
+        self::assertSame(1, $depths[0]);
+        self::assertGreaterThan(1, $depths[1]);
+    }
+
+    public function test_modifier_receives_context_with_top_level_depth() : void
+    {
+        /** @var array<int> $depths */
+        $depths = [];
+
+        $modifier = new class($depths) implements NodeModifier {
+            /**
+             * @param array<int> $depths
+             *
+             * @phpstan-ignore property.onlyWritten (accessed via reference)
+             */
+            public function __construct(private array &$depths)
+            {
+            }
+
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : null
+            {
+                $this->depths[] = $context->depth();
+
+                return null;
+            }
+        };
+
+        $traverser = new Traverser($modifier);
+        $result = $this->parseQuery('SELECT * FROM users');
+        $traverser->traverse($result);
+
+        self::assertContains(1, $depths);
+        self::assertTrue($depths[0] === 1);
+    }
+
     public function test_multiple_visitors() : void
     {
         $columnCollector = new ColumnRefCollector();
@@ -318,6 +530,29 @@ public function leave(object $node) : ?int
         self::assertSame(2, $visitor->nodeCount);
     }
 
+    public function test_traverser_accepts_both_visitors_and_modifiers() : void
+    {
+        $collector = new ColumnRefCollector();
+
+        $modifier = new class implements NodeModifier {
+            public static function nodeClass() : string
+            {
+                return SelectStmt::class;
+            }
+
+            public function modify(object $node, ModificationContext $context) : int|object|null
+            {
+                return null;
+            }
+        };
+
+        $traverser = new Traverser($collector, $modifier);
+        $result = $this->parseQuery('SELECT id, name FROM users');
+        $traverser->traverse($result);
+
+        self::assertCount(2, $collector->getColumnRefs());
+    }
+
     public function test_traverser_without_visitors() : void
     {
         $traverser = new Traverser();
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParsedQueryTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParsedQueryTest.php
index 23952ed58..4cd748fab 100644
--- a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParsedQueryTest.php
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParsedQueryTest.php
@@ -4,31 +4,27 @@
 
 namespace Flow\PgQuery\Tests\Unit;
 
+use function Flow\PgQuery\DSL\{pg_parse, pg_query_columns, pg_query_functions, pg_query_tables};
 use Flow\PgQuery\AST\Nodes\{Column, FunctionCall, Table};
 use Flow\PgQuery\AST\Visitors\{ColumnRefCollector, FuncCallCollector, RangeVarCollector};
-use Flow\PgQuery\Parser;
 use Flow\PgQuery\Protobuf\AST\ParseResult;
 use PHPUnit\Framework\TestCase;
 
 final class ParsedQueryTest extends TestCase
 {
-    private Parser $parser;
-
     protected function setUp() : void
     {
         if (!\extension_loaded('pg_query')) {
             self::markTestSkipped('pg_query extension is not loaded. For local development use `nix-shell --arg with-pg-query-ext true` to enable it in the shell.');
         }
-
-        $this->parser = new Parser();
     }
 
     public function test_columns_filtered_by_table() : void
     {
-        $result = $this->parser->parse('SELECT u.id, o.order_date FROM users u JOIN orders o ON u.id = o.user_id');
+        $result = pg_parse('SELECT u.id, o.order_date FROM users u JOIN orders o ON u.id = o.user_id');
 
-        $userColumns = $result->columns('u');
-        $orderColumns = $result->columns('o');
+        $userColumns = pg_query_columns($result)->forTable('u');
+        $orderColumns = pg_query_columns($result)->forTable('o');
 
         self::assertCount(2, $userColumns);
         $userColumnNames = \array_map(fn (Column $c) => $c->name(), $userColumns);
@@ -42,9 +38,9 @@ public function test_columns_filtered_by_table() : void
 
     public function test_columns_from_select() : void
     {
-        $result = $this->parser->parse('SELECT id, name FROM users');
+        $result = pg_parse('SELECT id, name FROM users');
 
-        $columns = $result->columns();
+        $columns = pg_query_columns($result)->all();
 
         self::assertCount(2, $columns);
 
@@ -55,9 +51,9 @@ public function test_columns_from_select() : void
 
     public function test_columns_from_where_clause() : void
     {
-        $result = $this->parser->parse('SELECT 1 FROM users WHERE active = true AND name LIKE \'%john%\'');
+        $result = pg_parse('SELECT 1 FROM users WHERE active = true AND name LIKE \'%john%\'');
 
-        $columns = $result->columns();
+        $columns = pg_query_columns($result)->all();
 
         $columnNames = \array_map(fn (Column $c) => $c->name(), $columns);
         self::assertContains('active', $columnNames);
@@ -66,9 +62,9 @@ public function test_columns_from_where_clause() : void
 
     public function test_columns_with_star() : void
     {
-        $result = $this->parser->parse('SELECT * FROM users');
+        $result = pg_parse('SELECT * FROM users');
 
-        $columns = $result->columns();
+        $columns = pg_query_columns($result)->all();
 
         self::assertCount(1, $columns);
         self::assertSame('*', $columns[0]->name());
@@ -77,9 +73,9 @@ public function test_columns_with_star() : void
 
     public function test_columns_with_table_qualified_star() : void
     {
-        $result = $this->parser->parse('SELECT u.* FROM users u');
+        $result = pg_parse('SELECT u.* FROM users u');
 
-        $columns = $result->columns();
+        $columns = pg_query_columns($result)->all();
 
         self::assertCount(1, $columns);
         self::assertSame('*', $columns[0]->name());
@@ -88,9 +84,9 @@ public function test_columns_with_table_qualified_star() : void
 
     public function test_columns_with_table_qualifier() : void
     {
-        $result = $this->parser->parse('SELECT u.id, u.name FROM users u');
+        $result = pg_parse('SELECT u.id, u.name FROM users u');
 
-        $columns = $result->columns();
+        $columns = pg_query_columns($result)->all();
 
         self::assertCount(2, $columns);
 
@@ -101,9 +97,9 @@ public function test_columns_with_table_qualifier() : void
 
     public function test_functions_from_select() : void
     {
-        $result = $this->parser->parse('SELECT COUNT(*), SUM(amount) FROM orders');
+        $result = pg_parse('SELECT COUNT(*), SUM(amount) FROM orders');
 
-        $functions = $result->functions();
+        $functions = pg_query_functions($result)->all();
 
         self::assertCount(2, $functions);
 
@@ -114,9 +110,9 @@ public function test_functions_from_select() : void
 
     public function test_functions_nested() : void
     {
-        $result = $this->parser->parse('SELECT UPPER(CONCAT(first_name, last_name)) FROM users');
+        $result = pg_parse('SELECT UPPER(CONCAT(first_name, last_name)) FROM users');
 
-        $functions = $result->functions();
+        $functions = pg_query_functions($result)->all();
 
         self::assertCount(2, $functions);
 
@@ -127,9 +123,9 @@ public function test_functions_nested() : void
 
     public function test_functions_with_schema() : void
     {
-        $result = $this->parser->parse('SELECT pg_catalog.now()');
+        $result = pg_parse('SELECT pg_catalog.now()');
 
-        $functions = $result->functions();
+        $functions = pg_query_functions($result)->all();
 
         self::assertCount(1, $functions);
         self::assertSame('now', $functions[0]->name());
@@ -138,16 +134,16 @@ public function test_functions_with_schema() : void
 
     public function test_raw_returns_parse_result() : void
     {
-        $result = $this->parser->parse('SELECT 1');
+        $result = pg_parse('SELECT 1');
 
         self::assertInstanceOf(ParseResult::class, $result->raw());
     }
 
     public function test_tables_from_cte() : void
     {
-        $result = $this->parser->parse('WITH active_users AS (SELECT * FROM users WHERE active = true) SELECT * FROM active_users');
+        $result = pg_parse('WITH active_users AS (SELECT * FROM users WHERE active = true) SELECT * FROM active_users');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(2, $tables);
 
@@ -158,9 +154,9 @@ public function test_tables_from_cte() : void
 
     public function test_tables_from_delete() : void
     {
-        $result = $this->parser->parse('DELETE FROM users WHERE id = 1');
+        $result = pg_parse('DELETE FROM users WHERE id = 1');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('users', $tables[0]->name());
@@ -168,9 +164,9 @@ public function test_tables_from_delete() : void
 
     public function test_tables_from_insert() : void
     {
-        $result = $this->parser->parse('INSERT INTO users (name) VALUES (\'john\')');
+        $result = pg_parse('INSERT INTO users (name) VALUES (\'john\')');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('users', $tables[0]->name());
@@ -178,9 +174,9 @@ public function test_tables_from_insert() : void
 
     public function test_tables_from_join() : void
     {
-        $result = $this->parser->parse('SELECT * FROM users u JOIN orders o ON u.id = o.user_id');
+        $result = pg_parse('SELECT * FROM users u JOIN orders o ON u.id = o.user_id');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(2, $tables);
 
@@ -191,9 +187,9 @@ public function test_tables_from_join() : void
 
     public function test_tables_from_simple_select() : void
     {
-        $result = $this->parser->parse('SELECT * FROM users');
+        $result = pg_parse('SELECT * FROM users');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertInstanceOf(Table::class, $tables[0]);
@@ -204,9 +200,9 @@ public function test_tables_from_simple_select() : void
 
     public function test_tables_from_subquery() : void
     {
-        $result = $this->parser->parse('SELECT * FROM (SELECT * FROM orders) AS sub');
+        $result = pg_parse('SELECT * FROM (SELECT * FROM orders) AS sub');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('orders', $tables[0]->name());
@@ -214,9 +210,9 @@ public function test_tables_from_subquery() : void
 
     public function test_tables_from_update() : void
     {
-        $result = $this->parser->parse('UPDATE users SET name = \'john\' WHERE id = 1');
+        $result = pg_parse('UPDATE users SET name = \'john\' WHERE id = 1');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('users', $tables[0]->name());
@@ -224,9 +220,9 @@ public function test_tables_from_update() : void
 
     public function test_tables_with_alias() : void
     {
-        $result = $this->parser->parse('SELECT * FROM users AS u');
+        $result = pg_parse('SELECT * FROM users AS u');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('users', $tables[0]->name());
@@ -235,9 +231,9 @@ public function test_tables_with_alias() : void
 
     public function test_tables_with_schema() : void
     {
-        $result = $this->parser->parse('SELECT * FROM public.users');
+        $result = pg_parse('SELECT * FROM public.users');
 
-        $tables = $result->tables();
+        $tables = pg_query_tables($result)->all();
 
         self::assertCount(1, $tables);
         self::assertSame('users', $tables[0]->name());
@@ -246,7 +242,7 @@ public function test_tables_with_schema() : void
 
     public function test_traverse_with_multiple_visitors() : void
     {
-        $result = $this->parser->parse('SELECT COUNT(id), name FROM users WHERE active = true');
+        $result = pg_parse('SELECT COUNT(id), name FROM users WHERE active = true');
 
         $columnCollector = new ColumnRefCollector();
         $funcCollector = new FuncCallCollector();
@@ -261,7 +257,7 @@ public function test_traverse_with_multiple_visitors() : void
 
     public function test_traverse_with_single_visitor() : void
     {
-        $result = $this->parser->parse('SELECT id, name FROM users');
+        $result = pg_parse('SELECT id, name FROM users');
 
         $collector = new ColumnRefCollector();
         $result->traverse($collector);
diff --git a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParserTest.php b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParserTest.php
index ded2c6190..fdaa37f8a 100644
--- a/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParserTest.php
+++ b/src/lib/pg-query/tests/Flow/PgQuery/Tests/Unit/ParserTest.php
@@ -4,7 +4,8 @@
 
 namespace Flow\PgQuery\Tests\Unit;
 
-use Flow\PgQuery\{DeparseOptions, ParsedQuery, Parser};
+use function Flow\PgQuery\DSL\{pg_deparse, pg_deparse_options, pg_fingerprint, pg_format, pg_normalize, pg_normalize_utility, pg_parse, pg_parser, pg_split, pg_summary};
+use Flow\PgQuery\ParsedQuery;
 use PHPUnit\Framework\TestCase;
 
 final class ParserTest extends TestCase
@@ -22,7 +23,7 @@ public function test_deparse_complex_query() : void
             self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $sql = 'SELECT u.id, u.name, COUNT(*) AS total FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true GROUP BY u.id, u.name ORDER BY total DESC LIMIT 10';
         $parsed = $parser->parse($sql);
 
@@ -41,7 +42,7 @@ public function test_deparse_round_trip() : void
             self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT id FROM users WHERE name = \'john\'');
         $deparsed = $parsed->deparse();
 
@@ -57,7 +58,7 @@ public function test_deparse_select_with_columns() : void
             self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT id, name FROM users');
 
         $deparsed = $parsed->deparse();
@@ -71,7 +72,7 @@ public function test_deparse_select_with_where() : void
             self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT * FROM users WHERE active = true');
 
         $deparsed = $parsed->deparse();
@@ -85,7 +86,7 @@ public function test_deparse_simple_select() : void
             self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT 1');
 
         $deparsed = $parsed->deparse();
@@ -99,11 +100,11 @@ public function test_deparse_with_options_complex_query() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $sql = 'SELECT u.id, u.name, COUNT(*) AS total FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true GROUP BY u.id, u.name HAVING COUNT(*) > 5 ORDER BY total DESC LIMIT 10';
         $parsed = $parser->parse($sql);
 
-        $formatted = $parsed->deparse(DeparseOptions::new()->indentSize(2));
+        $formatted = $parsed->deparse(pg_deparse_options()->indentSize(2));
 
         $expected = <<<'SQL'
 SELECT u.id, u.name, count(*) AS total
@@ -129,10 +130,10 @@ public function test_deparse_with_options_create_table() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('CREATE TABLE users (id SERIAL PRIMARY KEY, name VARCHAR(255) NOT NULL, email VARCHAR(255) UNIQUE, created_at TIMESTAMP DEFAULT NOW())');
 
-        $formatted = $parsed->deparse(DeparseOptions::new());
+        $formatted = $parsed->deparse(pg_deparse_options());
 
         self::assertStringContainsString('CREATE TABLE users', $formatted);
         self::assertStringContainsString('id serial', \strtolower($formatted));
@@ -146,10 +147,10 @@ public function test_deparse_with_options_custom_indent_size() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT u.id FROM users u JOIN orders o ON u.id = o.user_id');
 
-        $formatted = $parsed->deparse(DeparseOptions::new()->indentSize(2));
+        $formatted = $parsed->deparse(pg_deparse_options()->indentSize(2));
 
         $expected = <<<'SQL'
 SELECT u.id
@@ -167,10 +168,10 @@ public function test_deparse_with_options_insert() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse("INSERT INTO users (name, email, active) VALUES ('john', 'john@example.com', true)");
 
-        $formatted = $parsed->deparse(DeparseOptions::new());
+        $formatted = $parsed->deparse(pg_deparse_options());
 
         $expected = <<<'SQL'
 INSERT INTO users (name, email, active)
@@ -186,11 +187,11 @@ public function test_deparse_with_options_pretty_print_disabled_equals_regular_d
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT id FROM users');
 
         $regular = $parsed->deparse();
-        $formatted = $parsed->deparse(DeparseOptions::new()->prettyPrint(false));
+        $formatted = $parsed->deparse(pg_deparse_options()->prettyPrint(false));
 
         self::assertSame($regular, $formatted);
     }
@@ -201,10 +202,10 @@ public function test_deparse_with_options_pretty_prints_join() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT u.id, u.name, o.total FROM users u JOIN orders o ON u.id = o.user_id WHERE u.active = true');
 
-        $formatted = $parsed->deparse(DeparseOptions::new());
+        $formatted = $parsed->deparse(pg_deparse_options());
 
         $expected = <<<'SQL'
 SELECT u.id, u.name, o.total
@@ -223,10 +224,10 @@ public function test_deparse_with_options_pretty_prints_simple_select() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT id, name, email FROM users WHERE active = true');
 
-        $formatted = $parsed->deparse(DeparseOptions::new());
+        $formatted = $parsed->deparse(pg_deparse_options());
 
         $expected = <<<'SQL'
 SELECT id, name, email
@@ -243,18 +244,17 @@ public function test_deparse_with_options_trailing_newline() : void
             self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
+        $parser = pg_parser();
         $parsed = $parser->parse('SELECT 1');
 
-        $formatted = $parsed->deparse(DeparseOptions::new()->trailingNewline());
+        $formatted = $parsed->deparse(pg_deparse_options()->trailingNewline());
 
         self::assertSame("SELECT 1\n", $formatted);
     }
 
     public function test_fingerprint() : void
     {
-        $parser = new Parser();
-        $fingerprint = $parser->fingerprint('SELECT 1');
+        $fingerprint = pg_fingerprint('SELECT 1');
 
         self::assertIsString($fingerprint);
         self::assertNotEmpty($fingerprint);
@@ -262,18 +262,15 @@ public function test_fingerprint() : void
 
     public function test_fingerprint_same_for_equivalent_queries() : void
     {
-        $parser = new Parser();
-
-        $fingerprint1 = $parser->fingerprint('SELECT id FROM users WHERE id = 1');
-        $fingerprint2 = $parser->fingerprint('SELECT id FROM users WHERE id = 2');
+        $fingerprint1 = pg_fingerprint('SELECT id FROM users WHERE id = 1');
+        $fingerprint2 = pg_fingerprint('SELECT id FROM users WHERE id = 2');
 
         self::assertSame($fingerprint1, $fingerprint2);
     }
 
     public function test_normalize() : void
     {
-        $parser = new Parser();
-        $normalized = $parser->normalize('SELECT * FROM users WHERE id = 1');
+        $normalized = pg_normalize('SELECT * FROM users WHERE id = 1');
 
         self::assertIsString($normalized);
         self::assertStringContainsString('$1', $normalized);
@@ -281,8 +278,7 @@ public function test_normalize() : void
 
     public function test_normalize_multiple_values() : void
     {
-        $parser = new Parser();
-        $normalized = $parser->normalize("SELECT * FROM users WHERE id = 1 AND name = 'john'");
+        $normalized = pg_normalize("SELECT * FROM users WHERE id = 1 AND name = 'john'");
 
         self::assertIsString($normalized);
         self::assertStringContainsString('$1', $normalized);
@@ -295,8 +291,7 @@ public function test_normalize_utility() : void
             self::markTestSkipped('pg_query_normalize_utility function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $normalized = $parser->normalizeUtility('CREATE TABLE users (id INT, name VARCHAR(255))');
+        $normalized = pg_normalize_utility('CREATE TABLE users (id INT, name VARCHAR(255))');
 
         self::assertIsString($normalized);
         self::assertStringContainsString('CREATE TABLE', $normalized);
@@ -309,8 +304,7 @@ public function test_normalize_utility_preserves_ddl_structure() : void
             self::markTestSkipped('pg_query_normalize_utility function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $normalized = $parser->normalizeUtility('ALTER TABLE users ADD COLUMN email VARCHAR(255)');
+        $normalized = pg_normalize_utility('ALTER TABLE users ADD COLUMN email VARCHAR(255)');
 
         self::assertIsString($normalized);
         self::assertStringContainsString('ALTER TABLE', $normalized);
@@ -320,8 +314,7 @@ public function test_normalize_utility_preserves_ddl_structure() : void
 
     public function test_normalize_with_named_parameters() : void
     {
-        $parser = new Parser();
-        $normalized = $parser->normalize('SELECT * FROM users WHERE id = :id AND name = :name');
+        $normalized = pg_normalize('SELECT * FROM users WHERE id = :id AND name = :name');
 
         self::assertIsString($normalized);
         self::assertStringContainsString('$1', $normalized);
@@ -330,7 +323,7 @@ public function test_normalize_with_named_parameters() : void
 
     public function test_parse_invalid_sql_throws_exception() : void
     {
-        $parser = new Parser();
+        $parser = pg_parser();
 
         $this->expectException(\Flow\PgQuery\Exception\ParserException::class);
         $this->expectExceptionMessage('syntax error');
@@ -340,7 +333,7 @@ public function test_parse_invalid_sql_throws_exception() : void
 
     public function test_parse_multiple_statements() : void
     {
-        $parser = new Parser();
+        $parser = pg_parser();
         $result = $parser->parse('SELECT 1; SELECT 2');
 
         self::assertInstanceOf(ParsedQuery::class, $result);
@@ -349,7 +342,7 @@ public function test_parse_multiple_statements() : void
 
     public function test_parse_select_with_columns() : void
     {
-        $parser = new Parser();
+        $parser = pg_parser();
         $result = $parser->parse('SELECT id, name FROM users');
 
         self::assertInstanceOf(ParsedQuery::class, $result);
@@ -358,7 +351,7 @@ public function test_parse_select_with_columns() : void
 
     public function test_parse_select_with_where() : void
     {
-        $parser = new Parser();
+        $parser = pg_parser();
         $result = $parser->parse('SELECT * FROM users WHERE active = true');
 
         self::assertInstanceOf(ParsedQuery::class, $result);
@@ -367,17 +360,77 @@ public function test_parse_select_with_where() : void
 
     public function test_parse_simple_select() : void
     {
-        $parser = new Parser();
+        $parser = pg_parser();
         $result = $parser->parse('SELECT 1');
 
         self::assertInstanceOf(ParsedQuery::class, $result);
         self::assertCount(1, $result->raw()->getStmts());
     }
 
+    public function test_pg_deparse_with_options() : void
+    {
+        if (!\function_exists('pg_query_deparse_opts')) {
+            self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
+        }
+
+        $parsed = pg_parse('SELECT id FROM users u JOIN orders o ON u.id = o.user_id');
+
+        $deparsed = pg_deparse($parsed, pg_deparse_options()->indentSize(2));
+
+        $expected = <<<'SQL'
+SELECT id
+FROM
+  users u
+  JOIN orders o ON u.id = o.user_id
+SQL;
+
+        self::assertSame($expected, $deparsed);
+    }
+
+    public function test_pg_deparse_without_options() : void
+    {
+        if (!\function_exists('pg_query_deparse')) {
+            self::markTestSkipped('pg_query_deparse function not available. Rebuild the pg_query extension.');
+        }
+
+        $parsed = pg_parse('SELECT id, name FROM users');
+
+        $deparsed = pg_deparse($parsed);
+
+        self::assertSame('SELECT id, name FROM users', $deparsed);
+    }
+
+    public function test_pg_format_with_custom_options() : void
+    {
+        if (!\function_exists('pg_query_deparse_opts')) {
+            self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
+        }
+
+        $formatted = pg_format('SELECT 1', pg_deparse_options()->trailingNewline());
+
+        self::assertSame("SELECT 1\n", $formatted);
+    }
+
+    public function test_pg_format_with_default_options() : void
+    {
+        if (!\function_exists('pg_query_deparse_opts')) {
+            self::markTestSkipped('pg_query_deparse_opts function not available. Rebuild the pg_query extension.');
+        }
+
+        $formatted = pg_format('SELECT id, name FROM users WHERE active = true');
+
+        $expected = <<<'SQL'
+SELECT id, name
+FROM users
+WHERE active = true
+SQL;
+
+        self::assertSame($expected, $formatted);
+    }
+
     public function test_split() : void
     {
-        $parser = new Parser();
-        $statements = $parser->split('SELECT 1; SELECT 2;');
+        $statements = pg_split('SELECT 1; SELECT 2;');
 
         self::assertCount(2, $statements);
         self::assertSame('SELECT 1', $statements[0]);
@@ -386,8 +439,7 @@ public function test_split() : void
 
     public function test_split_single_statement() : void
     {
-        $parser = new Parser();
-        $statements = $parser->split('SELECT 1');
+        $statements = pg_split('SELECT 1');
 
         self::assertCount(1, $statements);
         self::assertSame('SELECT 1', $statements[0]);
@@ -399,9 +451,8 @@ public function test_summary_different_queries_produce_different_results() : voi
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summarySelect = $parser->summary('SELECT * FROM users');
-        $summaryInsert = $parser->summary("INSERT INTO users (name) VALUES ('john')");
+        $summarySelect = pg_summary('SELECT * FROM users');
+        $summaryInsert = pg_summary("INSERT INTO users (name) VALUES ('john')");
 
         self::assertNotSame($summarySelect, $summaryInsert);
     }
@@ -412,11 +463,9 @@ public function test_summary_invalid_sql_throws_parser_exception() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-
         $this->expectException(\Flow\PgQuery\Exception\ParserException::class);
 
-        $parser->summary('SELECT FROM WHERE');
+        pg_summary('SELECT FROM WHERE');
     }
 
     public function test_summary_returns_protobuf_for_cte() : void
@@ -425,10 +474,8 @@ public function test_summary_returns_protobuf_for_cte() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('WITH active_users AS (SELECT * FROM users WHERE active = true) SELECT * FROM active_users');
+        $summary = pg_summary('WITH active_users AS (SELECT * FROM users WHERE active = true) SELECT * FROM active_users');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -438,10 +485,8 @@ public function test_summary_returns_protobuf_for_ddl() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('CREATE TABLE users (id INT PRIMARY KEY, name VARCHAR(255))');
+        $summary = pg_summary('CREATE TABLE users (id INT PRIMARY KEY, name VARCHAR(255))');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -451,10 +496,8 @@ public function test_summary_returns_protobuf_for_delete() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('DELETE FROM users WHERE id = 1');
+        $summary = pg_summary('DELETE FROM users WHERE id = 1');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -464,10 +507,8 @@ public function test_summary_returns_protobuf_for_insert() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary("INSERT INTO users (name, email) VALUES ('john', 'john@example.com')");
+        $summary = pg_summary("INSERT INTO users (name, email) VALUES ('john', 'john@example.com')");
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -477,10 +518,8 @@ public function test_summary_returns_protobuf_for_join_query() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('SELECT u.name, o.total FROM users u JOIN orders o ON u.id = o.user_id');
+        $summary = pg_summary('SELECT u.name, o.total FROM users u JOIN orders o ON u.id = o.user_id');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -490,10 +529,8 @@ public function test_summary_returns_protobuf_for_select() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('SELECT * FROM users WHERE id = 1');
+        $summary = pg_summary('SELECT * FROM users WHERE id = 1');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
         self::assertGreaterThan(0, \strlen($summary));
     }
@@ -504,10 +541,8 @@ public function test_summary_returns_protobuf_for_subquery() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('SELECT * FROM users WHERE id IN (SELECT user_id FROM orders)');
+        $summary = pg_summary('SELECT * FROM users WHERE id IN (SELECT user_id FROM orders)');
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -517,10 +552,8 @@ public function test_summary_returns_protobuf_for_update() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary("UPDATE users SET name = 'jane' WHERE id = 1");
+        $summary = pg_summary("UPDATE users SET name = 'jane' WHERE id = 1");
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -530,10 +563,8 @@ public function test_summary_with_parse_options() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
-        $summary = $parser->summary('SELECT 1', PG_QUERY_PARSE_DEFAULT);
+        $summary = pg_summary('SELECT 1', PG_QUERY_PARSE_DEFAULT);
 
-        self::assertIsString($summary);
         self::assertNotEmpty($summary);
     }
 
@@ -543,13 +574,11 @@ public function test_summary_with_truncation_returns_different_result() : void
             self::markTestSkipped('pg_query_summary function not available. Rebuild the pg_query extension.');
         }
 
-        $parser = new Parser();
         $longQuery = "SELECT * FROM users WHERE name = 'this is a very long string that should be truncated in the summary output'";
 
-        $summaryWithoutTruncation = $parser->summary($longQuery, 0, 0);
-        $summaryWithTruncation = $parser->summary($longQuery, 0, 20);
+        $summaryWithoutTruncation = pg_summary($longQuery, 0, 0);
+        $summaryWithTruncation = pg_summary($longQuery, 0, 20);
 
-        self::assertIsString($summaryWithTruncation);
         self::assertNotEmpty($summaryWithTruncation);
         self::assertNotSame($summaryWithoutTruncation, $summaryWithTruncation);
     }
diff --git a/web/landing/assets/codemirror/completions/dsl.js b/web/landing/assets/codemirror/completions/dsl.js
index 3fdf91dc7..096cf8a97 100644
--- a/web/landing/assets/codemirror/completions/dsl.js
+++ b/web/landing/assets/codemirror/completions/dsl.js
@@ -1,7 +1,7 @@
 /**
  * CodeMirror Completer for Flow PHP DSL Functions
  *
- * Total functions: 355
+ * Total functions: 372
  *
  * This completer provides autocompletion for all Flow PHP DSL functions:
  * - Extractors (flow-extractors)
@@ -3299,6 +3299,60 @@ const dslFunctions = [
         },
         apply: snippet("\\Flow\\Filesystem\\DSL\\path_stdout(" + "$" + "{" + "1:options" + "}" + ")"),
         boost: 10
+    },        {
+        label: "pg_count_modifier",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_count_modifier</span><span class=\"fn-operator\">(</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">CountModifier</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a CountModifier that transforms a SELECT query into a COUNT query.<br>The original query is wrapped in: SELECT COUNT(*) FROM (...) AS _count_subq<br>ORDER BY and LIMIT/OFFSET are removed from the inner query.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_count_modifier()"),
+        boost: 10
+    },        {
+        label: "pg_deparse",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_deparse</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">ParsedQuery</span> <span class=\"fn-param\">$query</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">DeparseOptions</span> <span class=\"fn-param\">$options</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">null</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Convert a ParsedQuery AST back to SQL string.<br>When called without options, returns the SQL as a simple string.<br>When called with DeparseOptions, applies formatting (pretty-printing, indentation, etc.).<br>@throws \\RuntimeException if deparsing fails
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_deparse(" + "$" + "{" + "1:query" + "}" + ", " + "$" + "{" + "2:options" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_deparse_options",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_deparse_options</span><span class=\"fn-operator\">(</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">DeparseOptions</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create DeparseOptions for configuring SQL formatting.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_deparse_options()"),
+        boost: 10
     },        {
         label: "pg_fingerprint",
         type: "function",
@@ -3317,6 +3371,78 @@ const dslFunctions = [
         },
         apply: snippet("\\Flow\\PgQuery\\DSL\\pg_fingerprint(" + "$" + "{" + "1:sql" + "}" + ")"),
         boost: 10
+    },        {
+        label: "pg_format",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_format</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">DeparseOptions</span> <span class=\"fn-param\">$options</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">null</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Parse and format SQL query with pretty printing.<br>This is a convenience function that parses SQL and returns it formatted.<br>@param string $sql The SQL query to format<br>@param null|DeparseOptions $options Formatting options (defaults to pretty-print enabled)<br>@throws \\RuntimeException if parsing or deparsing fails
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_format(" + "$" + "{" + "1:sql" + "}" + ", " + "$" + "{" + "2:options" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_keyset_column",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_keyset_column</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$column</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">SortOrder</span> <span class=\"fn-param\">$order</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">Flow\\PgQuery\\AST\\Transformers\\SortOrder::...</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">KeysetColumn</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a KeysetColumn for keyset pagination.<br>@param string $column Column name (can include table alias like \"u.id\")<br>@param SortOrder $order Sort order (ASC or DESC)
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_keyset_column(" + "$" + "{" + "1:column" + "}" + ", " + "$" + "{" + "2:order" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_keyset_pagination",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_keyset_pagination</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$columns</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$cursor</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">null</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">KeysetPaginationModifier</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a KeysetPaginationModifier for cursor-based pagination.<br>Keyset pagination is more efficient than OFFSET for large datasets because it uses<br>indexed WHERE conditions instead of scanning and skipping rows.<br>@param int $limit Maximum number of rows to return<br>@param list<KeysetColumn> $columns Columns to use for keyset pagination (must match ORDER BY)<br>@param null|list<null|bool|float|int|string> $cursor Cursor values from the last row of previous page (null for first page)
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_keyset_pagination(" + "$" + "{" + "1:limit" + "}" + ", " + "$" + "{" + "2:columns" + "}" + ", " + "$" + "{" + "3:cursor" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_keyset_pagination_config",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_keyset_pagination_config</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$columns</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$cursor</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">null</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">KeysetPaginationConfig</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a KeysetPaginationConfig for cursor-based pagination.<br>@param int $limit Maximum number of rows to return<br>@param list<KeysetColumn> $columns Columns to use for keyset pagination (must match ORDER BY)<br>@param null|list<null|bool|float|int|string> $cursor Cursor values from the last row of previous page (null for first page)
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_keyset_pagination_config(" + "$" + "{" + "1:limit" + "}" + ", " + "$" + "{" + "2:columns" + "}" + ", " + "$" + "{" + "3:cursor" + "}" + ")"),
+        boost: 10
     },        {
         label: "pg_normalize",
         type: "function",
@@ -3328,13 +3454,67 @@ const dslFunctions = [
                     <span class=\"fn-name\">pg_normalize</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
                 </div>
                                 <div style="color: #8b949e; font-size: 13px;">
-                    Normalize SQL query by replacing literal values and named parameters with positional parameters.<br>WHERE id = :id will be changed into WHERE id = $1<br>WHERE id = 1 will be changed into WHERE id = $1
+                    Normalize SQL query by replacing literal values and named parameters with positional parameters.<br>WHERE id = :id will be changed into WHERE id = $1<br>WHERE id = 1 will be changed into WHERE id = $1.
                 </div>
                             `
             return div
         },
         apply: snippet("\\Flow\\PgQuery\\DSL\\pg_normalize(" + "$" + "{" + "1:sql" + "}" + ")"),
         boost: 10
+    },        {
+        label: "pg_normalize_utility",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_normalize_utility</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Normalize utility SQL statements (DDL like CREATE, ALTER, DROP).<br>This handles DDL statements differently from pg_normalize() which is optimized for DML.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_normalize_utility(" + "$" + "{" + "1:sql" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_pagination",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_pagination</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$offset</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">0</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">PaginationModifier</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a PaginationModifier for offset-based pagination.<br>Applies LIMIT and OFFSET to the query. OFFSET without ORDER BY will throw an exception.<br>@param int $limit Maximum number of rows to return<br>@param int $offset Number of rows to skip (requires ORDER BY in query)
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_pagination(" + "$" + "{" + "1:limit" + "}" + ", " + "$" + "{" + "2:offset" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_pagination_config",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_pagination_config</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$offset</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">0</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">PaginationConfig</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Create a PaginationConfig for offset-based pagination.<br>@param int $limit Maximum number of rows to return<br>@param int $offset Number of rows to skip (requires ORDER BY in query)
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_pagination_config(" + "$" + "{" + "1:limit" + "}" + ", " + "$" + "{" + "2:offset" + "}" + ")"),
+        boost: 10
     },        {
         label: "pg_parse",
         type: "function",
@@ -3365,6 +3545,60 @@ const dslFunctions = [
         },
         apply: snippet("\\Flow\\PgQuery\\DSL\\pg_parser()"),
         boost: 10
+    },        {
+        label: "pg_query_columns",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_query_columns</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">ParsedQuery</span> <span class=\"fn-param\">$query</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">Columns</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Extract columns from a parsed SQL query.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_query_columns(" + "$" + "{" + "1:query" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_query_functions",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_query_functions</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">ParsedQuery</span> <span class=\"fn-param\">$query</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">Functions</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Extract functions from a parsed SQL query.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_query_functions(" + "$" + "{" + "1:query" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_query_tables",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_query_tables</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">ParsedQuery</span> <span class=\"fn-param\">$query</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">Tables</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Extract tables from a parsed SQL query.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_query_tables(" + "$" + "{" + "1:query" + "}" + ")"),
+        boost: 10
     },        {
         label: "pg_split",
         type: "function",
@@ -3383,6 +3617,78 @@ const dslFunctions = [
         },
         apply: snippet("\\Flow\\PgQuery\\DSL\\pg_split(" + "$" + "{" + "1:sql" + "}" + ")"),
         boost: 10
+    },        {
+        label: "pg_summary",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_summary</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$options</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">0</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$truncateLimit</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">0</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Generate a summary of parsed queries in protobuf format.<br>Useful for query monitoring and logging without full AST overhead.
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_summary(" + "$" + "{" + "1:sql" + "}" + ", " + "$" + "{" + "2:options" + "}" + ", " + "$" + "{" + "3:truncateLimit" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_to_count_query",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_to_count_query</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Transform a SQL query into a COUNT query for pagination.<br>Wraps the query in: SELECT COUNT(*) FROM (...) AS _count_subq<br>Removes ORDER BY and LIMIT/OFFSET from the inner query.<br>@param string $sql The SQL query to transform<br>@return string The COUNT query
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_to_count_query(" + "$" + "{" + "1:sql" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_to_keyset_query",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_to_keyset_query</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$columns</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">array</span> <span class=\"fn-param\">$cursor</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">null</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Transform a SQL query into a keyset (cursor-based) paginated query.<br>More efficient than OFFSET for large datasets - uses indexed WHERE conditions.<br>@param string $sql The SQL query to paginate (must have ORDER BY)<br>@param int $limit Maximum number of rows to return<br>@param list<KeysetColumn> $columns Columns for keyset pagination (must match ORDER BY)<br>@param null|list<null|bool|float|int|string> $cursor Values from last row of previous page (null for first page)<br>@return string The paginated SQL query
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_to_keyset_query(" + "$" + "{" + "1:sql" + "}" + ", " + "$" + "{" + "2:limit" + "}" + ", " + "$" + "{" + "3:columns" + "}" + ", " + "$" + "{" + "4:cursor" + "}" + ")"),
+        boost: 10
+    },        {
+        label: "pg_to_paginated_query",
+        type: "function",
+        detail: "flow\u002Ddsl\u002Dhelpers",
+        info: () => {
+            const div = document.createElement("div")
+            div.innerHTML = `
+                <div style="font-family: 'Fira Code', 'JetBrains Mono', monospace; margin-bottom: 8px;">
+                    <span class=\"fn-name\">pg_to_paginated_query</span><span class=\"fn-operator\">(</span><span class=\"fn-type\">string</span> <span class=\"fn-param\">$sql</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$limit</span><span class=\"fn-operator\">,</span> <span class=\"fn-type\">int</span> <span class=\"fn-param\">$offset</span> <span class=\"fn-operator\">=</span> <span class=\"fn-default\">0</span><span class=\"fn-operator\">)</span> <span class=\"fn-operator\">:</span> <span class=\"fn-return\">string</span>
+                </div>
+                                <div style="color: #8b949e; font-size: 13px;">
+                    Transform a SQL query into a paginated query with LIMIT and OFFSET.<br>@param string $sql The SQL query to paginate<br>@param int $limit Maximum number of rows to return<br>@param int $offset Number of rows to skip (requires ORDER BY in query)<br>@return string The paginated SQL query
+                </div>
+                            `
+            return div
+        },
+        apply: snippet("\\Flow\\PgQuery\\DSL\\pg_to_paginated_query(" + "$" + "{" + "1:sql" + "}" + ", " + "$" + "{" + "2:limit" + "}" + ", " + "$" + "{" + "3:offset" + "}" + ")"),
+        boost: 10
     },        {
         label: "pie_chart",
         type: "function",
diff --git a/web/landing/assets/wasm/tools/flow.phar b/web/landing/assets/wasm/tools/flow.phar
index 2caefa6e5..e01c0129f 100755
Binary files a/web/landing/assets/wasm/tools/flow.phar and b/web/landing/assets/wasm/tools/flow.phar differ
diff --git a/web/landing/composer.json b/web/landing/composer.json
index 8adda2ad2..674813a03 100644
--- a/web/landing/composer.json
+++ b/web/landing/composer.json
@@ -88,6 +88,11 @@
         "build:tailwind": [
             "bin/console tailwind:build"
         ],
+        "build:playground:completers": [
+            "bin/console app:generate:data-frame-completer",
+            "bin/console app:generate:dsl-completer",
+            "bin/console app:generate:flow-completer"
+        ],
         "build": [
             "rm -rf public/assets",
             "rm -rf build",
diff --git a/web/landing/resources/dsl.json b/web/landing/resources/dsl.json
index 8b781a8e0..080c6e325 100644
--- a/web/landing/resources/dsl.json
+++ b/web/landing/resources/dsl.json
@@ -1 +1 @@
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