diff --git a/aana/api/api_generation.py b/aana/api/api_generation.py
index 5fd1f0ec..d18b7bf6 100644
--- a/aana/api/api_generation.py
+++ b/aana/api/api_generation.py
@@ -19,8 +19,8 @@
 from aana.exceptions.runtime import (
     MultipleFileUploadNotAllowed,
 )
-from aana.storage.engine import engine
 from aana.storage.services.task import create_task
+from aana.storage.session import get_session
 
 
 def get_default_values(func):
@@ -77,7 +77,7 @@ async def initialize(self):
                 self.asr_handle = await AanaDeploymentHandle.create("whisper_deployment")
             ```
         """
-        self.session = Session(engine)
+        self.session = get_session()
         self.initialized = True
 
     async def run(self, *args, **kwargs):
diff --git a/aana/api/request_handler.py b/aana/api/request_handler.py
index f79df0a4..94566085 100644
--- a/aana/api/request_handler.py
+++ b/aana/api/request_handler.py
@@ -19,13 +19,13 @@
 from aana.core.models.sampling import SamplingParams
 from aana.core.models.task import TaskId, TaskInfo
 from aana.deployments.aana_deployment_handle import AanaDeploymentHandle
-from aana.storage.engine import engine
 from aana.storage.repository.task import TaskRepository
+from aana.storage.session import get_session
 
 
 def get_db():
     """Get a database session."""
-    db = Session(engine)
+    db = get_session()
     try:
         yield db
     finally:
diff --git a/aana/core/models/chat.py b/aana/core/models/chat.py
index 41ce38af..4c009f37 100644
--- a/aana/core/models/chat.py
+++ b/aana/core/models/chat.py
@@ -1,7 +1,6 @@
 from typing import Annotated, Literal
 
 from pydantic import BaseModel, ConfigDict, Field
-from typing_extensions import Doc
 
 __all__ = [
     "Role",
diff --git a/aana/core/models/whisper.py b/aana/core/models/whisper.py
index 2e0629d0..54c1a615 100644
--- a/aana/core/models/whisper.py
+++ b/aana/core/models/whisper.py
@@ -3,7 +3,7 @@
 from pydantic import BaseModel, ConfigDict, Field, field_validator
 
 
-class MyConfig(ConfigDict, total=False):  # noqa: D101
+class MyConfig(ConfigDict, total=False):
     json_schema_extra: dict
 
 
diff --git a/aana/deployments/task_queue_deployment.py b/aana/deployments/task_queue_deployment.py
index d872b928..3e63ea9d 100644
--- a/aana/deployments/task_queue_deployment.py
+++ b/aana/deployments/task_queue_deployment.py
@@ -6,13 +6,13 @@
 import ray
 from pydantic import BaseModel, Field
 from ray import serve
-from sqlalchemy.orm import Session
 
 from aana.api.exception_handler import custom_exception_handler
 from aana.configs.settings import settings as aana_settings
 from aana.deployments.base_deployment import BaseDeployment
 from aana.storage.models.task import Status as TaskStatus
 from aana.storage.repository.task import TaskRepository
+from aana.storage.session import get_session
 from aana.utils.asyncio import run_async
 
 
@@ -35,10 +35,7 @@ def __init__(self):
         self.loop_task.add_done_callback(
             lambda fut: fut.result() if not fut.cancelled() else None
         )
-
-        from aana.storage.engine import engine
-
-        self.session = Session(engine)
+        self.session = get_session()
         self.task_repo = TaskRepository(self.session)
 
     def check_health(self):
diff --git a/aana/storage/__init__.py b/aana/storage/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/aana/storage/models/__init__.py b/aana/storage/models/__init__.py
index fc77ecec..11d60631 100644
--- a/aana/storage/models/__init__.py
+++ b/aana/storage/models/__init__.py
@@ -18,3 +18,11 @@
 from aana.storage.models.task import TaskEntity
 from aana.storage.models.transcript import TranscriptEntity
 from aana.storage.models.video import VideoEntity
+
+__all__ = [
+    "BaseEntity",
+    "MediaEntity",
+    "VideoEntity",
+    "CaptionEntity",
+    "TranscriptEntity",
+]
diff --git a/aana/storage/models/caption.py b/aana/storage/models/caption.py
index d93685e0..a53b860e 100644
--- a/aana/storage/models/caption.py
+++ b/aana/storage/models/caption.py
@@ -12,7 +12,16 @@
 
 
 class CaptionEntity(BaseEntity, TimeStampEntity):
-    """ORM model for video captions."""
+    """ORM model for video captions.
+
+    Attributes:
+        id (int): Unique identifier for the caption.
+        model (str): Name of the model used to generate the caption.
+        frame_id (int): The 0-based frame id of video for caption.
+        caption (str): Frame caption.
+        timestamp (float): Frame timestamp in seconds.
+        caption_type (str): The type of caption (populated automatically by ORM based on `polymorphic_identity` of subclass).
+    """
 
     __tablename__ = "caption"
 
@@ -44,7 +53,17 @@ def from_caption_output(
         frame_id: int,
         timestamp: float,
     ) -> CaptionEntity:
-        """Converts a Caption pydantic model to a CaptionEntity."""
+        """Converts a Caption pydantic model to a CaptionEntity.
+
+        Args:
+            model_name (str): Name of the model used to generate the caption.
+            caption (Caption): Caption pydantic model.
+            frame_id (int): The 0-based frame id of video for caption.
+            timestamp (float): Frame timestamp in seconds.
+
+        Returns:
+            CaptionEntity: ORM model for video captions.
+        """
         return CaptionEntity(
             model=model_name,
             frame_id=frame_id,
diff --git a/aana/storage/models/media.py b/aana/storage/models/media.py
index 1f2123b9..e5fe8b20 100644
--- a/aana/storage/models/media.py
+++ b/aana/storage/models/media.py
@@ -7,7 +7,14 @@
 
 
 class MediaEntity(BaseEntity, TimeStampEntity):
-    """Table for media items."""
+    """Base ORM class for media (e.g. videos, images, etc.).
+
+    This class is meant to be subclassed by other media types.
+
+    Attributes:
+        id (MediaId): Unique identifier for the media.
+        media_type (str): The type of media (populated automatically by ORM based on `polymorphic_identity` of   subclass).
+    """
 
     __tablename__ = "media"
     id: Mapped[MediaId] = mapped_column(
diff --git a/aana/storage/models/transcript.py b/aana/storage/models/transcript.py
index 30570cee..d2e34c61 100644
--- a/aana/storage/models/transcript.py
+++ b/aana/storage/models/transcript.py
@@ -16,7 +16,17 @@
 
 
 class TranscriptEntity(BaseEntity, TimeStampEntity):
-    """ORM class for media transcripts generated by a model."""
+    """ORM class for media transcripts generated by a model.
+
+    Attributes:
+        id (int): Unique identifier for the transcript.
+        model (str): Name of the model used to generate the transcript.
+        transcript (str): Full text transcript of the media.
+        segments (dict): Segments of the transcript.
+        language (str): Language of the transcript as predicted by the model.
+        language_confidence (float): Confidence score of language prediction.
+        transcript_type (str): The type of transcript (populated automatically by ORM based on `polymorphic_identity` of subclass).
+    """
 
     __tablename__ = "transcript"
 
@@ -50,7 +60,17 @@ def from_asr_output(
         transcription: AsrTranscription,
         segments: AsrSegments,
     ) -> TranscriptEntity:
-        """Converts an AsrTranscriptionInfo and AsrTranscription to a single Transcript entity."""
+        """Converts an AsrTranscriptionInfo and AsrTranscription to a single Transcript entity.
+
+        Args:
+            model_name (str): Name of the model used to generate the transcript.
+            info (AsrTranscriptionInfo): Information about the transcription.
+            transcription (AsrTranscription): The full transcription.
+            segments (AsrSegments): Segments of the transcription.
+
+        Returns:
+            TranscriptEntity: A new instance of the TranscriptEntity class.
+        """
         return TranscriptEntity(
             model=model_name,
             language=info.language,
diff --git a/aana/storage/models/video.py b/aana/storage/models/video.py
index 2f4eedfa..c06d1ba7 100644
--- a/aana/storage/models/video.py
+++ b/aana/storage/models/video.py
@@ -1,4 +1,3 @@
-
 from sqlalchemy import ForeignKey
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -7,7 +6,15 @@
 
 
 class VideoEntity(MediaEntity):
-    """Base ORM class for videos."""
+    """Base ORM class for videos.
+
+    Attributes:
+        id (MediaId): Unique identifier for the video.
+        path (str): Path to the video file.
+        url (str): URL to the video file.
+        title (str): Title of the video.
+        description (str): Description of the video.
+    """
 
     __tablename__ = "video"
 
diff --git a/aana/storage/repository/__init__.py b/aana/storage/repository/__init__.py
index e69de29b..01579195 100644
--- a/aana/storage/repository/__init__.py
+++ b/aana/storage/repository/__init__.py
@@ -0,0 +1,13 @@
+from aana.storage.repository.base import BaseRepository
+from aana.storage.repository.caption import CaptionRepository
+from aana.storage.repository.media import MediaRepository
+from aana.storage.repository.transcript import TranscriptRepository
+from aana.storage.repository.video import VideoRepository
+
+__all__ = [
+    "BaseRepository",
+    "MediaRepository",
+    "VideoRepository",
+    "CaptionRepository",
+    "TranscriptRepository",
+]
diff --git a/aana/storage/session.py b/aana/storage/session.py
index 8a12e369..4b51b87c 100644
--- a/aana/storage/session.py
+++ b/aana/storage/session.py
@@ -2,7 +2,13 @@
 
 from aana.storage.engine import engine
 
+__all__ = ["get_session"]
+
 
 def get_session() -> Session:
-    """Provides a SQLAlchemy Session object."""
+    """Get a new SQLAlchemy Session object.
+
+    Returns:
+        Session: SQLAlchemy Session object.
+    """
     return Session(engine)
diff --git a/aana/tests/conftest.py b/aana/tests/conftest.py
index 5f4651bc..f16a573f 100644
--- a/aana/tests/conftest.py
+++ b/aana/tests/conftest.py
@@ -150,7 +150,7 @@ def db_session():
         # Configure the database to use the temporary file
         settings.db_config.datastore_config = SQLiteConfig(path=tmp.name)
         # Reset the engine
-        settings.db_config.engine = None
+        settings.db_config._engine = None
 
         # Run migrations to set up the schema
         run_alembic_migrations(settings)
diff --git a/docs/reference/storage/index.md b/docs/reference/storage/index.md
new file mode 100644
index 00000000..8b6c43ff
--- /dev/null
+++ b/docs/reference/storage/index.md
@@ -0,0 +1,84 @@
+# Storage
+
+Aana SDK provides an integration with an SQL database to store and retrieve data. 
+
+Currently, Aana SDK supports SQLite (default) and PostgreSQL databases. See [Database Configuration](/reference/settings/#aana.configs.DbSettings) for more information.
+
+The database integration is based on the [SQLAlchemy](https://www.sqlalchemy.org/) library and consists of two main components: 
+
+- [Models](/reference/storage/models/) - Database models (entities) that represent tables in the database.
+- [Repositories](/reference/storage/repositories/) - Classes that provide an interface to interact with the database models.
+
+To use the database integration, you can either:
+
+- Use the provided models and repositories.
+- Create your own models and repositories by extending the provided ones (for example, extending the VideoEntity model to add custom fields).
+- Create your own models and repositories from scratch/base classes (for example, creating a new model for a new entity).
+
+## How to Use Provided Models and Repositories
+
+If you want to use the provided models and repositories, you can use the following steps:
+
+### Get session object
+
+You can use `get_session` method from the `aana.storage.session` module:
+    
+```python
+from aana.storage.session import get_session
+
+session = get_session()
+```
+
+<!-- ::: aana.storage.session.get_session -->
+
+If you are using Endpoint, you can use the `session` attribute that is available after the endpoint is initialized:
+
+```python
+from aana.api import Endpoint
+
+class TranscribeVideoEndpoint(Endpoint):
+    async def initialize(self):
+        await super().initialize()
+        # self.session is available here after the endpoint is initialized
+
+    async def run(self, video: VideoInput) -> WhisperOutput:
+        # self.session is available here as well
+```
+
+
+### Create a repository object and use it to interact with the database.
+
+You can use the provided repositories from the `aana.storage.repository` module. See [Repositories](/reference/storage/repositories/) for the list of available repositories.
+
+For example, to work with the `VideoEntity` model, you can create a `VideoRepository` object:
+
+```python
+from aana.storage.repository import VideoRepository
+
+video_repository = VideoRepository(session)
+```
+
+And then use the repository object to interact with the database (for example, save a video):
+
+```python
+from aana.core.models import Video
+
+video = Video(title="My Video", url="https://example.com/video.mp4")
+video_repository.save(video)
+```
+
+Or, if you are using Endpoint, you can create a repository object in the `initialize` method:
+
+```python
+from aana.api import Endpoint
+
+class TranscribeVideoEndpoint(Endpoint):
+    async def initialize(self):
+        await super().initialize()
+        self.video_repository = VideoRepository(self.session)
+
+    async def run(self, video: VideoInput) -> WhisperOutput:
+        video_obj: Video = await run_remote(download_video)(video_input=video)
+        self.video_repository.save(video_obj)
+        # ...
+``` 
\ No newline at end of file
diff --git a/docs/reference/storage/models.md b/docs/reference/storage/models.md
new file mode 100644
index 00000000..92a32543
--- /dev/null
+++ b/docs/reference/storage/models.md
@@ -0,0 +1,3 @@
+# Models
+
+::: aana.storage.models
\ No newline at end of file
diff --git a/docs/reference/storage/repositories.md b/docs/reference/storage/repositories.md
new file mode 100644
index 00000000..1bba69fd
--- /dev/null
+++ b/docs/reference/storage/repositories.md
@@ -0,0 +1,3 @@
+# Repositories
+
+::: aana.storage.repository
\ No newline at end of file
diff --git a/mkdocs.yml b/mkdocs.yml
index 11c60ab1..7993c11e 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -131,6 +131,10 @@ nav:
       - reference/models/vad.md
       - reference/models/video.md
       - reference/models/whisper.md
+    - Storage:
+      - reference/storage/index.md
+      - reference/storage/models.md
+      - reference/storage/repositories.md
     - reference/integrations.md
     - reference/processors.md
     - reference/exceptions.md