diff --git a/examples/synthesizers/privacy_example.py b/examples/synthesizers/privacy_example.py
index 3299c068..0c71c551 100644
--- a/examples/synthesizers/privacy_example.py
+++ b/examples/synthesizers/privacy_example.py
@@ -4,7 +4,7 @@
 from ydata.sdk.synthesizers import PrivacyLevel, RegularSynthesizer
 
 # Do not forget to add your token as env variables
-os.environ["YDATA_TOKEN"] = '<TOKEN>'  # Remove if already defined
+os.environ["YDATA_TOKEN"] = '{insert-your-token}'  # Remove if already defined
 
 
 def main():
@@ -16,12 +16,11 @@ def main():
 
     # We initialize a regular synthesizer
     # As long as the synthesizer does not call `fit`, it exists only locally
-    synth = RegularSynthesizer()
+    synth = RegularSynthesizer(name='Titanic Privacy')
 
     # We train the synthesizer on our dataset setting the privacy level to high
     synth.fit(
         X,
-        name="titanic_synthesizer",
         privacy_level=PrivacyLevel.HIGH_PRIVACY
     )
 
diff --git a/examples/synthesizers/regular_existing_datasource.py b/examples/synthesizers/regular_existing_datasource.py
new file mode 100644
index 00000000..47196e0f
--- /dev/null
+++ b/examples/synthesizers/regular_existing_datasource.py
@@ -0,0 +1,27 @@
+import os
+
+from ydata.sdk.datasources import DataSource
+from ydata.sdk.synthesizers import RegularSynthesizer
+
+# Authenticate to Fabric to leverage the SDK - https://docs.sdk.ydata.ai/latest/sdk/installation/
+# Make sure to add your token as env variable.
+os.environ["YDATA_TOKEN"] = '{insert-token}'  # Remove if already defined
+
+
+# In this example, we demonstrate how to train a synthesizer from an existing RDBMS Dataset.
+# Make sure to follow the step-by-step gu ide to create a Dataset in Fabric's catalog: https://docs.sdk.ydata.ai/latest/get-started/create_multitable_dataset/
+X = DataSource.get('{insert-datasource-id}')
+
+# Init a multi-table synthesizer. Provide a connector so that the process of data synthesis write the
+# synthetic data into the destination database
+# Provide a connector ID as the write_connector argument. See in this tutorial how to get a connector ID
+synth = RegularSynthesizer(name='existing_DS')
+
+# Start the training of your synthetic data generator
+synth.fit(X)
+
+# As soon as the training process is completed you are able to sample a synthetic database
+# The input expected is a percentage of the original database size
+# In this case it was requested a synthetic database with the same size as the original
+# Your synthetic sample was written to the database provided in the write_connector
+synth.sample(n_samples=1000)
diff --git a/pyproject.toml b/pyproject.toml
index a93e58c9..a79ae8e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ dependencies = [
     "pandas>=1.5.0",
     "prettytable==3.13.*",
     "pydantic>=2.0.0",
-    "typeguard==2.13.3",
+    "typeguard>=2.13.3, <2.14.0",
     "ydata-datascience",
     "requests==2.*",
 ]
diff --git a/src/ydata/sdk/connectors/connector.py b/src/ydata/sdk/connectors/connector.py
index 81081557..2ffa6695 100644
--- a/src/ydata/sdk/connectors/connector.py
+++ b/src/ydata/sdk/connectors/connector.py
@@ -50,8 +50,11 @@ def __init__(
             self, connector_type: Union[ConnectorType, str, None] = None, credentials: Optional[Dict] = None,
             name: Optional[str] = None, project: Optional[Project] = None, client: Optional[Client] = None):
         self._init_common(client=client)
-        self._model = _connector_type_to_model(ConnectorType._init_connector_type(connector_type))._create_model(
-            connector_type, credentials, name, client=client)
+
+        self._model = self.create(connector_type=connector_type,
+                                  credentials=credentials,
+                                  name=name, project=project,
+                                  client=client)
 
         self._project = project
 
@@ -150,9 +153,13 @@ def create(
 
         payload = {
             "type": connector_type.value,
-            "credentials": credentials.dict(by_alias=True)
+            "credentials": credentials if isinstance(credentials, dict) else credentials.dict(by_alias=True)
         }
-        model = connector_class._create(payload, name, project, client)
+
+        if client is None:
+            model = connector_class._create(payload, name, project)
+        else:
+            model = connector_class._create(payload, name, project, client)
 
         connector = connector_class._init_from_model_data(model)
         connector._project = project
diff --git a/src/ydata/sdk/datasources/_models/datasource.py b/src/ydata/sdk/datasources/_models/datasource.py
index 082efd49..08be2fc5 100644
--- a/src/ydata/sdk/datasources/_models/datasource.py
+++ b/src/ydata/sdk/datasources/_models/datasource.py
@@ -20,10 +20,10 @@ class DataSource:
     connector_type: Optional[str] = None
 
     def __post_init__(self):
-        if self.metadata is not None:
+        if self.metadata is not None and not isinstance(self.metadata, Metadata):
             self.metadata = Metadata(**self.metadata)
 
-        if self.status is not None:
+        if self.status is not None and not isinstance(self.status, Status):
             self.status = Status(**self.status)
 
     def to_payload(self):
diff --git a/src/ydata/sdk/datasources/_models/datasources/mysql.py b/src/ydata/sdk/datasources/_models/datasources/mysql.py
index b144d4ca..af99c21d 100644
--- a/src/ydata/sdk/datasources/_models/datasources/mysql.py
+++ b/src/ydata/sdk/datasources/_models/datasources/mysql.py
@@ -1,4 +1,4 @@
-from dataclasses import dataclass
+from dataclasses import asdict, dataclass
 
 from ydata.sdk.datasources._models.datasource import DataSource
 
@@ -10,4 +10,4 @@ class MySQLDataSource(DataSource):
     tables: dict = None
 
     def to_payload(self):
-        self.dict()
+        return asdict(self)
diff --git a/src/ydata/sdk/datasources/_models/status.py b/src/ydata/sdk/datasources/_models/status.py
index c830f511..f19674c7 100644
--- a/src/ydata/sdk/datasources/_models/status.py
+++ b/src/ydata/sdk/datasources/_models/status.py
@@ -21,6 +21,7 @@ class MetadataState(StringEnum):
     GENERATING = 'generating'
     FAILED = 'failed'
     AVAILABLE = 'available'
+    UNAVAILABLE = 'unavailable'
 
 
 class ProfilingState(StringEnum):
@@ -29,6 +30,7 @@ class ProfilingState(StringEnum):
     GENERATING = 'generating'
     FAILED = 'failed'
     AVAILABLE = 'available'
+    UNAVAILABLE = 'unavailable'
 
 
 class State(StringEnum):
@@ -73,6 +75,7 @@ class Status(BaseModel):
     validation: Optional[ValidationStatus] = Field(None)
     metadata: Optional[MetadataStatus] = Field(None)
     profiling: Optional[ProfilingStatus] = Field(None)
+    dependentSynthesizersNumber: Optional[int] = Field(None)
 
     @staticmethod
     def unknown() -> "Status":
diff --git a/src/ydata/sdk/datasources/datasource.py b/src/ydata/sdk/datasources/datasource.py
index 968afd2f..1d1b6817 100644
--- a/src/ydata/sdk/datasources/datasource.py
+++ b/src/ydata/sdk/datasources/datasource.py
@@ -59,6 +59,10 @@ def _init_common(self, client: Optional[Client] = None):
         self._client = client
         self._logger = create_logger(__name__, level=LOG_LEVEL)
 
+    @property
+    def client(self):
+        return self._client
+
     @property
     def uid(self) -> UID:
         return self._model.uid
@@ -127,7 +131,8 @@ def get(uid: UID, project: Optional[Project] = None, client: Optional[Client] =
         data: list = response.json()
         datasource_type = CONNECTOR_TO_DATASOURCE.get(
             ConnectorType(data['connector']['type']))
-        datasource = DataSource._model_from_api(data, datasource_type)
+        model = DataSource._model_from_api(data, datasource_type)
+        datasource = DataSource._init_from_model_data(model)
         datasource._project = project
         return datasource
 
@@ -152,6 +157,7 @@ def create(
             DataSource
         """
         datasource_type = CONNECTOR_TO_DATASOURCE.get(connector.type)
+
         return cls._create(
             connector=connector, datasource_type=datasource_type, datatype=datatype, config=config, name=name,
             project=project, wait_for_metadata=wait_for_metadata, client=client)
@@ -163,8 +169,14 @@ def _create(
         name: Optional[str] = None, project: Optional[Project] = None, wait_for_metadata: bool = True,
         client: Optional[Client] = None
     ) -> "DataSource":
-        model = DataSource._create_model(
-            connector, datasource_type, datatype, config, name, project, client)
+
+        if client is None:
+            model = DataSource._create_model(
+                connector, datasource_type, datatype, config, name, project)
+        else:
+            model = DataSource._create_model(
+                connector, datasource_type, datatype, config, name, project, client)
+
         datasource = DataSource._init_from_model_data(model)
 
         if wait_for_metadata:
@@ -201,9 +213,10 @@ def _create_model(
     @staticmethod
     def _wait_for_metadata(datasource):
         logger = create_logger(__name__, level=LOG_LEVEL)
+        client = datasource._client
         while State(datasource.status.state) not in [State.AVAILABLE, State.FAILED, State.UNAVAILABLE]:
             logger.info(f'Calculating metadata [{datasource.status}]')
-            datasource = DataSource.get(uid=datasource.uid, client=datasource._client)
+            datasource = DataSource.get(uid=datasource.uid, client=client)
             sleep(BACKOFF)
         return datasource
 
diff --git a/src/ydata/sdk/synthesizers/synthesizer.py b/src/ydata/sdk/synthesizers/synthesizer.py
index 7327b3b6..c10e98a5 100644
--- a/src/ydata/sdk/synthesizers/synthesizer.py
+++ b/src/ydata/sdk/synthesizers/synthesizer.py
@@ -172,7 +172,7 @@ def _validate_datasource_attributes(X, dataset_attrs: DataSourceAttrs, datatype:
                 raise DataTypeMissingError(
                     "Argument `datatype` is mandatory for pandas.DataFrame training data")
         elif datatype == DataSourceType.MULTITABLE:
-            tables = [t for t in X.tables.keys()]  # noqa: F841
+            tables = [t for t in X._model.tables.keys()]  # noqa: F841
             # Does it make sense to add more validations here?
         else:
             columns = [c.name for c in X.metadata.columns]
@@ -320,14 +320,14 @@ def _sample(self, payload: Dict) -> pdDataFrame:
         response = self._client.post(
             f"/synthesizer/{self.uid}/sample", json=payload, project=self._project)
 
-        data: Dict = response.json()
-        sample_uid = data.get('uid')
+        data = response.json()
+        sample_uid: str = data.get('uid')
         sample_status = None
         while sample_status not in ['finished', 'failed']:
             self._logger.info('Sampling from the synthesizer...')
             response = self._client.get(
                 f'/synthesizer/{self.uid}/history', project=self._project)
-            history: Dict = response.json()
+            history: list = response.json()
             sample_data = next((s for s in history if s.get('uid') == sample_uid), None)
             sample_status = sample_data.get('status', {}).get('state')
             sleep(BACKOFF)
diff --git a/src/ydata/sdk/utils/logger.py b/src/ydata/sdk/utils/logger.py
index 5f3b61a9..4a341744 100644
--- a/src/ydata/sdk/utils/logger.py
+++ b/src/ydata/sdk/utils/logger.py
@@ -31,7 +31,7 @@ def get_datasource_info(dataframe, datatype):
         nrows, ncols = dataframe.shape[0], dataframe.shape[1]
         ntables = None  # calculate the number of rows and cols
     else:
-        connector = dataframe.connector_type
+        connector = dataframe._model.connector_type
         if DataSourceType(datatype) != DataSourceType.MULTITABLE:
             nrows = dataframe.metadata.number_of_rows
             ncols = len(dataframe.metadata.columns)
@@ -39,7 +39,7 @@ def get_datasource_info(dataframe, datatype):
         else:
             nrows = 0
             ncols = 0
-            ntables = len(dataframe.tables.keys())
+            ntables = len(dataframe._model.tables.keys())
     return connector, nrows, ncols, ntables