diff --git a/src/Repositories/CategoryRepository.php b/src/Repositories/CategoryRepository.php
new file mode 100644
index 0000000..e4d014e
--- /dev/null
+++ b/src/Repositories/CategoryRepository.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace Bazaar\Repositories;
+
+use Bazaar\Core\Database;
+
+final class CategoryRepository
+{
+    public function __construct(private readonly Database $db)
+    {
+    }
+
+    public function all(): array
+    {
+        return $this->db->select('SELECT * FROM categories ORDER BY name ASC');
+    }
+
+    public function find(int $id): ?array
+    {
+        return $this->db->selectOne('SELECT * FROM categories WHERE id = ?', [$id]);
+    }
+
+    public function findBySlug(string $slug): ?array
+    {
+        return $this->db->selectOne('SELECT * FROM categories WHERE slug = ?', [$slug]);
+    }
+
+    public function create(string $name, string $slug, string $description): int
+    {
+        return $this->db->insert(
+            'INSERT INTO categories (name, slug, description) VALUES (?, ?, ?)',
+            [$name, $slug, $description]
+        );
+    }
+
+    public function update(int $id, string $name, string $slug, string $description): void
+    {
+        $this->db->statement(
+            'UPDATE categories SET name = ?, slug = ?, description = ? WHERE id = ?',
+            [$name, $slug, $description, $id]
+        );
+    }
+
+    public function delete(int $id): void
+    {
+        $this->db->statement('DELETE FROM categories WHERE id = ?', [$id]);
+    }
+
+    public function withProductCounts(): array
+    {
+        return $this->db->select(
+            'SELECT c.*, COUNT(p.id) AS productCount
+             FROM categories c
+             LEFT JOIN products p ON p.categoryId = c.id
+             GROUP BY c.id
+             ORDER BY c.name ASC'
+        );
+    }
+}
diff --git a/src/Repositories/UserRepository.php b/src/Repositories/UserRepository.php
new file mode 100644
index 0000000..cc41e0a
--- /dev/null
+++ b/src/Repositories/UserRepository.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace Bazaar\Repositories;
+
+use Bazaar\Core\Database;
+
+final class UserRepository
+{
+    public function __construct(private readonly Database $db)
+    {
+    }
+
+    public function findByEmail(string $email): ?array
+    {
+        return $this->db->selectOne(
+            'SELECT * FROM users WHERE email = ?',
+            [strtolower(trim($email))]
+        );
+    }
+
+    public function findById(int $id): ?array
+    {
+        return $this->db->selectOne('SELECT * FROM users WHERE id = ?', [$id]);
+    }
+
+    public function emailExists(string $email): bool
+    {
+        return (int) $this->db->scalar(
+            'SELECT COUNT(*) FROM users WHERE email = ?',
+            [strtolower(trim($email))]
+        ) > 0;
+    }
+
+    public function create(string $email, string $passwordHash, string $name, bool $isAdmin = false, string $role = 'customer'): int
+    {
+        if ($isAdmin) {
+            $role = 'admin';
+        }
+        return $this->db->insert(
+            'INSERT INTO users (email, passwordHash, name, isAdmin, role, createdAt)
+             VALUES (?, ?, ?, ?, ?, ?)',
+            [strtolower(trim($email)), $passwordHash, $name, $isAdmin ? 1 : 0, $role, gmdate('c')]
+        );
+    }
+
+    public function setRole(int $id, string $role): void
+    {
+        $this->db->statement(
+            'UPDATE users SET role = ?, isAdmin = ? WHERE id = ?',
+            [$role, $role === 'admin' ? 1 : 0, $id]
+        );
+    }
+
+    public function all(): array
+    {
+        return $this->db->select('SELECT id, email, name, role, isAdmin, createdAt FROM users ORDER BY createdAt DESC, id DESC');
+    }
+
+    public function count(): int
+    {
+        return (int) $this->db->scalar('SELECT COUNT(*) FROM users');
+    }
+}
diff --git a/src/Repositories/WishlistRepository.php b/src/Repositories/WishlistRepository.php
new file mode 100644
index 0000000..5d5b3ad
--- /dev/null
+++ b/src/Repositories/WishlistRepository.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Bazaar\Repositories;
+
+use Bazaar\Core\Database;
+
+final class WishlistRepository
+{
+    public function __construct(private readonly Database $db)
+    {
+    }
+
+    public function has(int $userId, int $productId): bool
+    {
+        return (int) $this->db->scalar(
+            'SELECT COUNT(*) FROM wishlistItems WHERE userId = ? AND productId = ?',
+            [$userId, $productId]
+        ) > 0;
+    }
+
+    public function add(int $userId, int $productId): void
+    {
+        $this->db->statement(
+            'INSERT INTO wishlistItems (userId, productId, createdAt)
+             VALUES (?, ?, ?)
+             ON CONFLICT(userId, productId) DO NOTHING',
+            [$userId, $productId, gmdate('c')]
+        );
+    }
+
+    public function remove(int $userId, int $productId): void
+    {
+        $this->db->statement(
+            'DELETE FROM wishlistItems WHERE userId = ? AND productId = ?',
+            [$userId, $productId]
+        );
+    }
+
+    public function toggle(int $userId, int $productId): bool
+    {
+        if ($this->has($userId, $productId)) {
+            $this->remove($userId, $productId);
+            return false;
+        }
+        $this->add($userId, $productId);
+        return true;
+    }
+
+    public function forUser(int $userId): array
+    {
+        return $this->db->select(
+            'SELECT p.*, c.name AS categoryName, c.slug AS categorySlug, w.createdAt AS savedAt
+             FROM wishlistItems w
+             JOIN products p ON p.id = w.productId
+             LEFT JOIN categories c ON c.id = p.categoryId
+             WHERE w.userId = ?
+             ORDER BY w.createdAt DESC, w.id DESC',
+            [$userId]
+        );
+    }
+
+    public function productIdsForUser(int $userId): array
+    {
+        return array_map(
+            'intval',
+            array_column(
+                $this->db->select('SELECT productId FROM wishlistItems WHERE userId = ?', [$userId]),
+                'productId'
+            )
+        );
+    }
+
+    public function count(int $userId): int
+    {
+        return (int) $this->db->scalar('SELECT COUNT(*) FROM wishlistItems WHERE userId = ?', [$userId]);
+    }
+}