feat: add batch setting operations (codeigniter4#161)

Author: memleakd

docs/basic-usage.md

@@ -30,13 +30,32 @@ when retrieved.
 service('settings')->set('App.siteName', 'My Great Site');
 ```
 
+You can save multiple values with `setMany()`. This behaves like calling `set()` for each key/value pair,
+but allows supported handlers to persist the changes more efficiently.
+
+```php
+service('settings')->setMany([
+    'App.siteName'  => 'My Great Site',
+    'App.siteEmail' => '[email protected]',
+]);
+```
+
 You can delete a value from the persistent storage with the `forget()` method. Since it is removed from the storage,
 it effectively resets itself back to the default value in config file, if any.
 
 ```php
 service('settings')->forget('App.siteName');
 ```
 
+You can delete multiple values with `forgetMany()`.
+
+```php
+service('settings')->forgetMany([
+    'App.siteName',
+    'App.siteEmail',
+]);
+```
+
 If you ever need to completely remove all settings from their persistent storage, you can use the `flush()` method. This immediately removes all settings from the database and the in-memory cache.
 
 ```php
@@ -62,6 +81,16 @@ $context = 'user:' . user_id();
 service('settings')->set('App.theme', 'dark', $context);
 ```
 
+The same context can be applied to a batch of values:
+
+```php
+$context = 'user:' . user_id();
+service('settings')->setMany([
+    'App.theme' => 'dark',
+    'App.locale' => 'en',
+], $context);
+```
+
 Now when your filter is determining which theme to apply it can check for the current user as the context:
 
 ```php
@@ -91,9 +120,17 @@ setting('App.siteName', 'My Great Site');
 // Using the service through the helper
 $name = setting()->get('App.siteName');
 setting()->set('App.siteName', 'My Great Site');
+setting()->setMany([
+    'App.siteName'  => 'My Great Site',
+    'App.siteEmail' => '[email protected]',
+]);
 
 // Forgetting a value
 setting()->forget('App.siteName');
+setting()->forgetMany([
+    'App.siteName',
+    'App.siteEmail',
+]);
 ```
 
 !!! Note

docs/configuration.md

@@ -32,6 +32,11 @@ Handlers like `database` and `file` support deferred writes. When `deferWrites`
 are batched and persisted efficiently at the end of the request during the `post_system` event. This minimizes the number of
 database queries or file I/O operations, improving performance for write-heavy operations.
 
+!!! note
+    This is separate from the explicit `setMany()` and `forgetMany()` APIs. Batch APIs allow callers to group multiple settings
+    in one method call, while deferred writes decide whether writes are persisted immediately or at the end of the request.
+    The two features are independent and can be combined.
+
 ### Multiple handlers
 
 Example:
@@ -94,6 +99,16 @@ $settings->set('Example.prop3', 'value3');
 
 The deferred approach is especially beneficial when updating existing records or performing many operations in a single request.
 
+For explicit batches, use `setMany()` or `forgetMany()`:
+
+```php
+$settings->setMany([
+    'Example.prop1' => 'value1',
+    'Example.prop2' => 'value2',
+    'Example.prop3' => 'value3',
+]);
+```
+
 ---
 
 ## FileHandler
@@ -136,6 +151,16 @@ $settings->set('Example.prop3', 'value3');
 
 The deferred approach is especially beneficial when updating multiple properties in the same class.
 
+For explicit batches, use `setMany()` or `forgetMany()`:
+
+```php
+$settings->setMany([
+    'Example.prop1' => 'value1',
+    'Example.prop2' => 'value2',
+    'Example.prop3' => 'value3',
+]);
+```
+
 ---
 
 ## ArrayHandler

docs/limitations.md

@@ -5,7 +5,8 @@ The following are known limitations of the library:
 1. **Immediate writes (`deferWrites => false`)**: Each setting is written to storage immediately when you call `set()` or `forget()`.
    The first operation hydrates all settings for that context (1 SELECT query), then each subsequent write performs a separate
    INSERT or UPDATE. While `DatabaseHandler` and `FileHandler` use an in-memory cache to maintain fast reads, individual write
-   operations may result in multiple database queries or file writes per request.
+   operations may result in multiple database queries or file writes per request. When multiple changes are known ahead of time,
+   use `setMany()` or `forgetMany()` to group them explicitly and allow supported handlers to persist them more efficiently.
 
 2. **Deferred writes (`deferWrites => true`)**: All settings are batched and written to storage at the end of the request
    (during the `post_system` event). This minimizes the number of database queries and file writes, improving performance.

src/Handlers/BaseHandler.php

@@ -35,6 +35,21 @@ public function set(string $class, string $property, $value = null, ?string $con
         throw new RuntimeException('Set method not implemented for current Settings handler.');
     }
 
+    /**
+     * If the Handler supports saving values, it MAY override this method
+     * to provide optimized batch functionality.
+     *
+     * @param list<array{class: string, property: string, value: mixed}> $settings
+     *
+     * @throws RuntimeException
+     */
+    public function setMany(array $settings, ?string $context = null): void
+    {
+        foreach ($settings as $setting) {
+            $this->set($setting['class'], $setting['property'], $setting['value'], $context);
+        }
+    }
+
     /**
      * If the Handler supports forgetting values, it
      * MUST override this method to provide that functionality.
@@ -48,6 +63,21 @@ public function forget(string $class, string $property, ?string $context = null)
         throw new RuntimeException('Forget method not implemented for current Settings handler.');
     }
 
+    /**
+     * If the Handler supports forgetting values, it MAY override this method
+     * to provide optimized batch functionality.
+     *
+     * @param list<array{class: string, property: string}> $settings
+     *
+     * @throws RuntimeException
+     */
+    public function forgetMany(array $settings, ?string $context = null): void
+    {
+        foreach ($settings as $setting) {
+            $this->forget($setting['class'], $setting['property'], $context);
+        }
+    }
+
     /**
      * All handlers MUST support flushing all values.
      *