diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index 0cec2593039..22187ae55b1 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -17,6 +17,17 @@ return array(
     'NCU\\Config\\Lexicon\\Preset' => $baseDir . '/lib/unstable/Config/Lexicon/Preset.php',
     'NCU\\Config\\ValueType' => $baseDir . '/lib/unstable/Config/ValueType.php',
     'NCU\\Federation\\ISignedCloudFederationProvider' => $baseDir . '/lib/unstable/Federation/ISignedCloudFederationProvider.php',
+    'NCU\\FullTextSearch\\Exceptions\\ServiceNotFoundException' => $baseDir . '/lib/unstable/FullTextSearch/Exceptions/ServiceNotFoundException.php',
+    'NCU\\FullTextSearch\\IContentProvider' => $baseDir . '/lib/unstable/FullTextSearch/IContentProvider.php',
+    'NCU\\FullTextSearch\\IContentProviderImprovedSearch' => $baseDir . '/lib/unstable/FullTextSearch/IContentProviderImprovedSearch.php',
+    'NCU\\FullTextSearch\\IContentProviderSyncIndex' => $baseDir . '/lib/unstable/FullTextSearch/IContentProviderSyncIndex.php',
+    'NCU\\FullTextSearch\\IIndexQueryHelper' => $baseDir . '/lib/unstable/FullTextSearch/IIndexQueryHelper.php',
+    'NCU\\FullTextSearch\\ILoggerService' => $baseDir . '/lib/unstable/FullTextSearch/ILoggerService.php',
+    'NCU\\FullTextSearch\\IManager' => $baseDir . '/lib/unstable/FullTextSearch/IManager.php',
+    'NCU\\FullTextSearch\\IService' => $baseDir . '/lib/unstable/FullTextSearch/IService.php',
+    'NCU\\FullTextSearch\\Model\\Document' => $baseDir . '/lib/unstable/FullTextSearch/Model/Document.php',
+    'NCU\\FullTextSearch\\Model\\DocumentAccess' => $baseDir . '/lib/unstable/FullTextSearch/Model/DocumentAccess.php',
+    'NCU\\FullTextSearch\\Model\\UnindexedDocument' => $baseDir . '/lib/unstable/FullTextSearch/Model/UnindexedDocument.php',
     'NCU\\Security\\Signature\\Enum\\DigestAlgorithm' => $baseDir . '/lib/unstable/Security/Signature/Enum/DigestAlgorithm.php',
     'NCU\\Security\\Signature\\Enum\\SignatoryStatus' => $baseDir . '/lib/unstable/Security/Signature/Enum/SignatoryStatus.php',
     'NCU\\Security\\Signature\\Enum\\SignatoryType' => $baseDir . '/lib/unstable/Security/Signature/Enum/SignatoryType.php',
@@ -1831,6 +1842,7 @@ return array(
     'OC\\Files\\View' => $baseDir . '/lib/private/Files/View.php',
     'OC\\ForbiddenException' => $baseDir . '/lib/private/ForbiddenException.php',
     'OC\\FullTextSearch\\FullTextSearchManager' => $baseDir . '/lib/private/FullTextSearch/FullTextSearchManager.php',
+    'OC\\FullTextSearch\\Manager' => $baseDir . '/lib/private/FullTextSearch/Manager.php',
     'OC\\FullTextSearch\\Model\\DocumentAccess' => $baseDir . '/lib/private/FullTextSearch/Model/DocumentAccess.php',
     'OC\\FullTextSearch\\Model\\IndexDocument' => $baseDir . '/lib/private/FullTextSearch/Model/IndexDocument.php',
     'OC\\FullTextSearch\\Model\\SearchOption' => $baseDir . '/lib/private/FullTextSearch/Model/SearchOption.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index c07b6d127cc..18a784bab88 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -58,6 +58,17 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'NCU\\Config\\Lexicon\\Preset' => __DIR__ . '/../../..' . '/lib/unstable/Config/Lexicon/Preset.php',
         'NCU\\Config\\ValueType' => __DIR__ . '/../../..' . '/lib/unstable/Config/ValueType.php',
         'NCU\\Federation\\ISignedCloudFederationProvider' => __DIR__ . '/../../..' . '/lib/unstable/Federation/ISignedCloudFederationProvider.php',
+        'NCU\\FullTextSearch\\Exceptions\\ServiceNotFoundException' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/Exceptions/ServiceNotFoundException.php',
+        'NCU\\FullTextSearch\\IContentProvider' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IContentProvider.php',
+        'NCU\\FullTextSearch\\IContentProviderImprovedSearch' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IContentProviderImprovedSearch.php',
+        'NCU\\FullTextSearch\\IContentProviderSyncIndex' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IContentProviderSyncIndex.php',
+        'NCU\\FullTextSearch\\IIndexQueryHelper' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IIndexQueryHelper.php',
+        'NCU\\FullTextSearch\\ILoggerService' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/ILoggerService.php',
+        'NCU\\FullTextSearch\\IManager' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IManager.php',
+        'NCU\\FullTextSearch\\IService' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/IService.php',
+        'NCU\\FullTextSearch\\Model\\Document' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/Model/Document.php',
+        'NCU\\FullTextSearch\\Model\\DocumentAccess' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/Model/DocumentAccess.php',
+        'NCU\\FullTextSearch\\Model\\UnindexedDocument' => __DIR__ . '/../../..' . '/lib/unstable/FullTextSearch/Model/UnindexedDocument.php',
         'NCU\\Security\\Signature\\Enum\\DigestAlgorithm' => __DIR__ . '/../../..' . '/lib/unstable/Security/Signature/Enum/DigestAlgorithm.php',
         'NCU\\Security\\Signature\\Enum\\SignatoryStatus' => __DIR__ . '/../../..' . '/lib/unstable/Security/Signature/Enum/SignatoryStatus.php',
         'NCU\\Security\\Signature\\Enum\\SignatoryType' => __DIR__ . '/../../..' . '/lib/unstable/Security/Signature/Enum/SignatoryType.php',
@@ -1872,6 +1883,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OC\\Files\\View' => __DIR__ . '/../../..' . '/lib/private/Files/View.php',
         'OC\\ForbiddenException' => __DIR__ . '/../../..' . '/lib/private/ForbiddenException.php',
         'OC\\FullTextSearch\\FullTextSearchManager' => __DIR__ . '/../../..' . '/lib/private/FullTextSearch/FullTextSearchManager.php',
+        'OC\\FullTextSearch\\Manager' => __DIR__ . '/../../..' . '/lib/private/FullTextSearch/Manager.php',
         'OC\\FullTextSearch\\Model\\DocumentAccess' => __DIR__ . '/../../..' . '/lib/private/FullTextSearch/Model/DocumentAccess.php',
         'OC\\FullTextSearch\\Model\\IndexDocument' => __DIR__ . '/../../..' . '/lib/private/FullTextSearch/Model/IndexDocument.php',
         'OC\\FullTextSearch\\Model\\SearchOption' => __DIR__ . '/../../..' . '/lib/private/FullTextSearch/Model/SearchOption.php',
diff --git a/lib/private/AppFramework/Bootstrap/RegistrationContext.php b/lib/private/AppFramework/Bootstrap/RegistrationContext.php
index 8bd1ff35610..18d22c8d4c6 100644
--- a/lib/private/AppFramework/Bootstrap/RegistrationContext.php
+++ b/lib/private/AppFramework/Bootstrap/RegistrationContext.php
@@ -10,6 +10,7 @@ declare(strict_types=1);
 namespace OC\AppFramework\Bootstrap;
 
 use Closure;
+use NCU\FullTextSearch\IService as IFullTextSearchService;
 use OC\Support\CrashReport\Registry;
 use OCP\AppFramework\App;
 use OCP\AppFramework\Bootstrap\IRegistrationContext;
@@ -145,6 +146,11 @@ class RegistrationContext {
 	/** @var array<array-key, string> */
 	private array $configLexiconClasses = [];
 
+	/** @var null|ServiceRegistration<IFullTextSearchService> */
+	private ?ServiceRegistration $fullTextSearchService = null;
+	/** @var array<array-key, string> */
+	private array $fullTextSearchContentProviders = [];
+
 	/** @var ServiceRegistration<ITeamResourceProvider>[] */
 	private array $teamResourceProviders = [];
 
@@ -443,6 +449,20 @@ class RegistrationContext {
 					$configLexiconClass
 				);
 			}
+
+			public function registerFullTextSearchService(string $service): void {
+				$this->context->registerFullTextSearchService(
+					$this->appId,
+					$service
+				);
+			}
+
+			public function registerFullTextSearchContentProvider(string $contentProviderClass): void {
+				$this->context->registerFullTextSearchContentProvider(
+					$this->appId,
+					$contentProviderClass
+				);
+			}
 		};
 	}
 
@@ -657,6 +677,24 @@ class RegistrationContext {
 		$this->configLexiconClasses[$appId] = $configLexiconClass;
 	}
 
+	public function registerFullTextSearchService(string $appId, string $service) {
+		if ($appId !== 'fulltextsearch') {
+			throw new RuntimeException('Only the FullTextSearch app is allowed to register a fts service');
+		}
+		if ($this->fullTextSearchService !== null) {
+			throw new RuntimeException('There can only be one FullTextSearch service');
+		}
+
+		$this->fullTextSearchService = new ServiceRegistration($appId, $service);
+	}
+
+	/**
+	 * @psalm-param class-string<ILexicon> $contentProviderClass
+	 */
+	public function registerFullTextSearchContentProvider(string $appId, string $contentProviderClass): void {
+		$this->fullTextSearchContentProviders[$appId] = $contentProviderClass;
+	}
+
 	/**
 	 * @param App[] $apps
 	 */
@@ -1031,4 +1069,18 @@ class RegistrationContext {
 
 		return \OCP\Server::get($this->configLexiconClasses[$appId]);
 	}
+
+	/**
+	 * @return ServiceRegistration<IFullTextSearchService>|null
+	 */
+	public function getFullTextSearchService(): ?ServiceRegistration {
+		return $this->fullTextSearchService;
+	}
+
+	/**
+	 * @return ServiceRegistration<\NCU\FullTextSearch\IContentProvider>[]
+	 */
+	public function getFullTextSearchContentProviders(): array {
+		return $this->fullTextSearchContentProviders;
+	}
 }
diff --git a/lib/private/FullTextSearch/Manager.php b/lib/private/FullTextSearch/Manager.php
new file mode 100644
index 00000000000..540d960fd9a
--- /dev/null
+++ b/lib/private/FullTextSearch/Manager.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OC\FullTextSearch;
+
+use NCU\FullTextSearch\Exceptions\ServiceNotFoundException;
+use NCU\FullTextSearch\IContentProvider;
+use NCU\FullTextSearch\IManager;
+use NCU\FullTextSearch\IService;
+use OC\AppFramework\Bootstrap\Coordinator;
+use OC\AppFramework\Bootstrap\ServiceRegistration;
+use Psr\Container\ContainerInterface;
+
+class Manager implements IManager {
+	private ?IService $service = null;
+
+	public function __construct(
+		private readonly Coordinator $coordinator,
+		private readonly ContainerInterface $container,
+	) {
+	}
+
+	/**
+	 * @throws ServiceNotFoundException if no full text search service found
+	 */
+	public function getService(): IService {
+		if ($this->service === null) {
+			$registration = $this->coordinator->getRegistrationContext()?->getFullTextSearchService();
+			if ($registration === null) {
+				throw new ServiceNotFoundException('fts service not found');
+			}
+			$this->service = $this->container->get($registration->getService());
+		}
+
+		return $this->service;
+	}
+
+	/**
+	 * @return ServiceRegistration<IContentProvider>[]
+	 */
+	public function getContentProviders(): array {
+		return $this->coordinator->getRegistrationContext()?->getFullTextSearchContentProviders() ?? [];
+	}
+}
diff --git a/lib/private/Server.php b/lib/private/Server.php
index a14ff622647..a1627870093 100644
--- a/lib/private/Server.php
+++ b/lib/private/Server.php
@@ -1208,6 +1208,7 @@ class Server extends ServerContainer implements IServerContainer {
 		$this->registerAlias(\OCP\Dashboard\IManager::class, \OC\Dashboard\Manager::class);
 
 		$this->registerAlias(IFullTextSearchManager::class, FullTextSearchManager::class);
+		$this->registerAlias(\NCU\FullTextSearch\IManager::class, \OC\FullTextSearch\Manager::class);
 		$this->registerAlias(IFilesMetadataManager::class, FilesMetadataManager::class);
 
 		$this->registerAlias(ISubAdmin::class, SubAdmin::class);
diff --git a/lib/public/AppFramework/Bootstrap/IRegistrationContext.php b/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
index 70b35228c87..9f7129c8bf3 100644
--- a/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
+++ b/lib/public/AppFramework/Bootstrap/IRegistrationContext.php
@@ -447,4 +447,21 @@ interface IRegistrationContext {
 	 * @since 31.0.0
 	 */
 	public function registerConfigLexicon(string $configLexiconClass): void;
+
+	/**
+	 * allow FullTextSearch to register its service
+	 * @since 33.0.0
+	 */
+	public function registerFullTextSearchService(string $service): void;
+
+	/**
+	 * Register an implementation of \NCU\FullTextSearch\IContentProvider that
+	 * will handle the getaway with full text search to extract app's content
+	 *
+	 * @param string $contentProviderClass
+	 *
+	 * @psalm-param class-string<\NCU\FullTextSearch\IContentProvider> $contentProviderClass
+	 * @since 33.0.0
+	 */
+	public function registerFullTextSearchContentProvider(string $contentProviderClass): void;
 }
diff --git a/lib/unstable/FullTextSearch/Exceptions/ServiceNotFoundException.php b/lib/unstable/FullTextSearch/Exceptions/ServiceNotFoundException.php
new file mode 100644
index 00000000000..c60bc2bb18e
--- /dev/null
+++ b/lib/unstable/FullTextSearch/Exceptions/ServiceNotFoundException.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch\Exceptions;
+
+use Exception;
+
+class ServiceNotFoundException extends Exception {
+}
diff --git a/lib/unstable/FullTextSearch/IContentProvider.php b/lib/unstable/FullTextSearch/IContentProvider.php
new file mode 100644
index 00000000000..a9ce7cdf066
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IContentProvider.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+use NCU\FullTextSearch\Model\Document;
+
+interface IContentProvider {
+	public function getId(): string;
+	public function getConfiguration(): array;
+
+//	public function setIndexOptions(IIndexOptions $options);
+	public function getDocument(string $documentId): ?Document;
+}
diff --git a/lib/unstable/FullTextSearch/IContentProviderImprovedSearch.php b/lib/unstable/FullTextSearch/IContentProviderImprovedSearch.php
new file mode 100644
index 00000000000..9f3d73efdda
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IContentProviderImprovedSearch.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+use OCP\FullTextSearch\Model\ISearchRequest;
+use OCP\FullTextSearch\Model\ISearchResult;
+use OCP\FullTextSearch\Model\ISearchTemplate;
+
+/**
+ * implementing this interface to your content provider
+ * will complete it with search related features
+ */
+interface IContentProviderImprovedSearch {
+	public function getSearchTemplate(): ?ISearchTemplate;
+	public function improveSearchRequest(ISearchRequest $searchRequest): void;
+	public function improveSearchResult(ISearchResult $searchResult): void;
+}
diff --git a/lib/unstable/FullTextSearch/IContentProviderSyncIndex.php b/lib/unstable/FullTextSearch/IContentProviderSyncIndex.php
new file mode 100644
index 00000000000..4d23bf1d7fc
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IContentProviderSyncIndex.php
@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+use Generator;
+use OCP\FullTextSearch\IFullTextSearchManager;
+
+/**
+ * this interface needs to be implemented to re-generate a full sync
+ * if not implemented, the only source of documents to be indexed are via the API
+ *
+ * @see IFullTextSearchManager::requestIndex()
+ */
+interface IContentProviderSyncIndex {
+	/*
+	 * if $qh is ignored, indexes are compared lately in the process
+	 * if the IIndexQueryHelper is useless but returned documents are to be indexed, you must
+	 * initiated the method with a call to $qh->notNeeded()
+	 *
+	 * @return Generator<UnindexedDocument|[UnindexedDocument]>
+	 */
+	public function getUnindexedDocuments(IIndexQueryHelper $qh): Generator;
+}
diff --git a/lib/unstable/FullTextSearch/IIndexQueryHelper.php b/lib/unstable/FullTextSearch/IIndexQueryHelper.php
new file mode 100644
index 00000000000..c92edfd63db
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IIndexQueryHelper.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+interface IIndexQueryHelper {
+}
diff --git a/lib/unstable/FullTextSearch/ILoggerService.php b/lib/unstable/FullTextSearch/ILoggerService.php
new file mode 100644
index 00000000000..4720b684a5c
--- /dev/null
+++ b/lib/unstable/FullTextSearch/ILoggerService.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types = 1);
+
+/**
+ * SPDX-FileCopyrightText: 2017 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+interface ILoggerService {
+	public function info(string $entry): void;
+	public function action(string $entry): void;
+	public function warning(string $entry, array $data = []): void;
+	public function error(string $entry, array $data = []): void;
+}
diff --git a/lib/unstable/FullTextSearch/IManager.php b/lib/unstable/FullTextSearch/IManager.php
new file mode 100644
index 00000000000..b28452aedf4
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IManager.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+use NCU\FullTextSearch\Exceptions\ServiceNotFoundException;
+use OC\AppFramework\Bootstrap\ServiceRegistration;
+
+interface IManager {
+	/**
+	 * returns FullTextSearch API
+	 *
+	 * @throws ServiceNotFoundException if no full text search service found
+	 * @since 33.0.0
+	 */
+	public function getService(): IService;
+
+	/**
+	 * returns list of registered FullTextSearch config provider
+	 *
+	 * @return ServiceRegistration<IContentProvider>[]
+	 * @since 33.0.0
+	 */
+	public function getContentProviders(): array;
+}
diff --git a/lib/unstable/FullTextSearch/IService.php b/lib/unstable/FullTextSearch/IService.php
new file mode 100644
index 00000000000..c7a7bb6be10
--- /dev/null
+++ b/lib/unstable/FullTextSearch/IService.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch;
+
+interface IService {
+	public function getLogger(): ILoggerService;
+	public function requestIndex(string $providerId, string $documentId): void;
+	public function deleteIndex(string $providerId, string $documentId): void;
+}
diff --git a/lib/unstable/FullTextSearch/Model/Document.php b/lib/unstable/FullTextSearch/Model/Document.php
new file mode 100644
index 00000000000..53ab36b0e6c
--- /dev/null
+++ b/lib/unstable/FullTextSearch/Model/Document.php
@@ -0,0 +1,167 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch\Model;
+
+use JsonException;
+use Psr\Log\LoggerInterface;
+
+final class Document {
+	private string $id = '';
+	private int $flags = 0;
+	private ?DocumentAccess $access = null;
+	private string $title = '';
+	private string $content = '';
+	private bool $contentEncoded = false;
+	private int $contentSize = 0;
+	private int $lastModificationTime = 0;
+	private array $tags = [];
+	private array $documentTags = [];
+	private array $parts = [];
+	private string $checksum = '';
+
+	public function setId(string $id): void {
+		$this->id = $id;
+	}
+
+	public function getId(): string {
+		return $this->id;
+	}
+
+	public function setFlags(int $flags): Document {
+		$this->flags = $flags;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getFlags(): int {
+		return $this->flags;
+	}
+
+	public function setAccess(?DocumentAccess $access): Document {
+		$this->access = $access;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getAccess(): ?DocumentAccess {
+		return $this->access;
+	}
+
+	public function setTitle(string $title): Document {
+		$this->title = $title;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getTitle(): string {
+		return $this->title;
+	}
+
+	public function setContent(string $content, bool $encoded = false): Document {
+		$this->content = $content;
+		$this->contentSize = strlen($content);
+		$this->contentEncoded = $encoded;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getContent(): string {
+		return $this->content;
+	}
+
+	public function isContentEncoded(): bool {
+		return $this->contentEncoded;
+	}
+
+	public function getContentSize(): int {
+		return $this->contentSize;
+	}
+
+	public function setLastModificationTime(int $lastModificationTime): Document {
+		$this->lastModificationTime = $lastModificationTime;
+		return $this;
+	}
+
+	public function getLastModificationTime(): int {
+		return $this->lastModificationTime;
+	}
+
+	public function setTags(array $tags): Document {
+		$this->tags = $tags;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getTags(): array {
+		return $this->tags;
+	}
+
+	public function setDocumentTags(array $documentTags): Document {
+		$this->documentTags = $documentTags;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getDocumentTags(): array {
+		return $this->documentTags;
+	}
+
+	public function addPart(string $key, string $part): Document {
+		$this->parts[$key] = $part;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function setParts(array $parts): Document {
+		$this->parts = $parts;
+		$this->checksum = '';
+		return $this;
+	}
+
+	public function getParts(): array {
+		return $this->parts;
+	}
+
+	public function getChecksum(): string {
+		if ($this->checksum === '') {
+			$data = [
+				'title' => $this->getTitle(),
+				'access' => $this->getAccess(),
+				'flags' => $this->getFlags(),
+				'tags' => $this->getTags(),
+				'documentTags' => $this->getDocumentTags(),
+				'parts' => $this->getParts(),
+				'content' => $this->getContent()
+			];
+
+			try {
+				$this->checksum = hash('xxh3', json_encode($data, JSON_THROW_ON_ERROR));
+			} catch (JsonException $e) {
+				\OCP\Server::get(LoggerInterface::class)->warning('issue while generating checksum', ['exception' => $e]);
+			}
+		}
+
+		return $this->checksum;
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'title' => $this->getTitle(),
+			'access' => $this->getAccess(),
+			'flags' => $this->getFlags(),
+			'tags' => $this->getTags(),
+			'documentTags' => $this->getDocumentTags(),
+			'lastModificationTime' => $this->getLastModificationTime(),
+			'contentSize' => $this->getContentSize(),
+			'contentEncoded' => $this->isContentEncoded(),
+			'checksum' => $this->getChecksum(),
+		];
+	}
+}
diff --git a/lib/unstable/FullTextSearch/Model/DocumentAccess.php b/lib/unstable/FullTextSearch/Model/DocumentAccess.php
new file mode 100644
index 00000000000..dc229a40b5c
--- /dev/null
+++ b/lib/unstable/FullTextSearch/Model/DocumentAccess.php
@@ -0,0 +1,86 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch\Model;
+
+final class DocumentAccess {
+	private string $viewerId = '';
+	public function __construct(
+		private string $ownerId = '',
+		private array $users = [],
+		private array $groups = [],
+		private array $circles = [],
+		private array $links = [],
+	) {
+	}
+
+	public function getViewerId(): string {
+		return $this->viewerId;
+	}
+
+	public function setViewerId(string $viewerId): DocumentAccess {
+		$this->viewerId = $viewerId;
+		return $this;
+	}
+
+	public function getLinks(): array {
+		return $this->links;
+	}
+
+	public function setLinks(array $links): DocumentAccess {
+		$this->links = $links;
+		return $this;
+	}
+
+	public function getCircles(): array {
+		return $this->circles;
+	}
+
+	public function setCircles(array $circles): DocumentAccess {
+		$this->circles = $circles;
+		return $this;
+	}
+
+	public function getGroups(): array {
+		return $this->groups;
+	}
+
+	public function setGroups(array $groups): DocumentAccess {
+		$this->groups = $groups;
+		return $this;
+	}
+
+	public function getUsers(): array {
+		return $this->users;
+	}
+
+	public function setUsers(array $users): DocumentAccess {
+		$this->users = $users;
+		return $this;
+	}
+
+	public function getOwnerId(): string {
+		return $this->ownerId;
+	}
+
+	public function setOwnerId(string $ownerId): DocumentAccess {
+		$this->ownerId = $ownerId;
+		return $this;
+	}
+
+	public function jsonSerialize(): array {
+		return [
+			'ownerId' => $this->getOwnerId(),
+			'users' => $this->getUsers(),
+			'groups' => $this->getGroups(),
+			'circles' => $this->getCircles(),
+			'links' => $this->getLinks(),
+		];
+	}
+}
diff --git a/lib/unstable/FullTextSearch/Model/UnindexedDocument.php b/lib/unstable/FullTextSearch/Model/UnindexedDocument.php
new file mode 100644
index 00000000000..17256153aa8
--- /dev/null
+++ b/lib/unstable/FullTextSearch/Model/UnindexedDocument.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace NCU\FullTextSearch\Model;
+
+final readonly class UnindexedDocument {
+	public function __construct(
+		private string $id,
+		private int $lastModified,
+	) {
+	}
+
+	public function getId(): string {
+		return $this->id;
+	}
+
+	public function getLastModified(): int {
+		return $this->lastModified;
+	}
+}