diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index b0e6335e..d5483ebb 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -42,5 +42,5 @@ jobs:
       uses: ikalnytskyi/action-setup-postgres@v6 
     - name: Test with pytest
       env:
-        USE_DEPLOYMENT_CACHE: True
+        SNOWFLAKE_TEST_PARAMETERS: ${{ secrets.SNOWFLAKE_TEST_PARAMETERS }}
       run: poetry run pytest -vv
diff --git a/.github/workflows/run_tests_with_gpu.yml b/.github/workflows/run_tests_with_gpu.yml
index fe75ea7a..b18bf8cb 100644
--- a/.github/workflows/run_tests_with_gpu.yml
+++ b/.github/workflows/run_tests_with_gpu.yml
@@ -34,7 +34,7 @@ jobs:
     
     - name: Run tests with GPU
       run: |
-        HF_TOKEN=${{ secrets.HF_TOKEN }} dstack apply -f tests.dstack.yml --force -y
+        SNOWFLAKE_TEST_PARAMETERS=${{ secrets.SNOWFLAKE_TEST_PARAMETERS }} HF_TOKEN=${{ secrets.HF_TOKEN }} dstack apply -f tests.dstack.yml --force -y
 
     - name: Extract pytest logs
       if: ${{ always() }}
diff --git a/aana/alembic/env.py b/aana/alembic/env.py
index 7f5e658f..80772a49 100644
--- a/aana/alembic/env.py
+++ b/aana/alembic/env.py
@@ -9,6 +9,8 @@
 
 
 class SnowflakeImpl(DefaultImpl):
+    """Custom implementation for Snowflake."""
+
     __dialect__ = "snowflake"
 
 
diff --git a/aana/alembic/versions/5ad873484aa3_init.py b/aana/alembic/versions/5ad873484aa3_init.py
index c3a6033d..c62abda4 100644
--- a/aana/alembic/versions/5ad873484aa3_init.py
+++ b/aana/alembic/versions/5ad873484aa3_init.py
@@ -23,12 +23,15 @@ def upgrade() -> None:
     # ### commands auto generated by Alembic - please adjust! ###
     # id_seq = Sequence('my_sequence_name', start=1, increment=1)
 
-    op.execute(CreateSequence(Sequence("caption_id_seq")))
-    op.execute(CreateSequence(Sequence("transcript_id_seq")))
+    if op.get_context().dialect.name != "sqlite":
+        op.execute(CreateSequence(Sequence("caption_id_seq")))
+        op.execute(CreateSequence(Sequence("transcript_id_seq")))
 
     op.create_table(
         "caption",
-        sa.Column("id", sa.Integer(), Sequence("caption_id_seq"), nullable=False),
+        sa.Column("id", sa.Integer(), Sequence("caption_id_seq"), nullable=False)
+        if op.get_context().dialect.name == "snowflake"
+        else sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
         sa.Column(
             "model",
             sa.String(),
@@ -96,7 +99,12 @@ def upgrade() -> None:
     )
     op.create_table(
         "tasks",
-        sa.Column("id", sa.String(), nullable=False, comment="Task ID"),
+        sa.Column(
+            "id",
+            sa.String() if op.get_context().dialect.name == "snowflake" else sa.UUID(),
+            nullable=False,
+            comment="Task ID",
+        ),
         sa.Column(
             "endpoint",
             sa.String(),
@@ -165,11 +173,13 @@ def upgrade() -> None:
             comment="Timestamp when row is updated",
         ),
         sa.PrimaryKeyConstraint("id", name=op.f("pk_tasks")),
-        prefixes=["HYBRID"],
+        prefixes=["HYBRID"] if op.get_context().dialect.name == "snowflake" else [],
     )
     op.create_table(
         "transcript",
-        sa.Column("id", sa.Integer(), Sequence("transcript_id_seq"), nullable=False),
+        sa.Column("id", sa.Integer(), Sequence("transcript_id_seq"), nullable=False)
+        if op.get_context().dialect.name == "snowflake"
+        else sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
         sa.Column(
             "model",
             sa.String(),
diff --git a/aana/storage/custom_types.py b/aana/storage/custom_types.py
index 11afcdbd..70015813 100644
--- a/aana/storage/custom_types.py
+++ b/aana/storage/custom_types.py
@@ -26,35 +26,15 @@ def process(value):
         return process
 
 
-JSON = VARIANT
-
-# class JSON(TypeDecorator):
-#     """Custom JSON type that supports Snowflake-specific and standard dialects."""
-
-#     impl = SqlAlchemyJSON  # Default to standard SQLAlchemy JSON
-
-#     def load_dialect_impl(self, dialect):
-#         """Load dialect-specific implementation."""
-#         if dialect.name == "snowflake":
-#             return SnowflakeVariantType()
-#         return self.impl
-
-#     def bind_expression(self, bindvalue):
-#         """Handle binding expressions dynamically."""
-#         if hasattr(
-#             bindvalue.type, "bind_expression"
-#         ):  # Check if impl has bind_expression
-#             return bindvalue.type.bind_expression(bindvalue)
-#         return bindvalue  # Default binding behavior
-
-#     def process_result_value(self, value, dialect):
-#         """Process the result based on dialect."""
-#         if dialect.name == "snowflake":
-#             if value is None:
-#                 return None
-#             try:
-#                 return orjson.loads(value)
-#             except (ValueError, TypeError):
-#                 return value  # Return raw value if not valid JSON
-#         # For other dialects, call the default implementation
-#         return self.impl.process_result_value(value, dialect)
+class JSON(TypeDecorator):
+    """Custom JSON type that supports Snowflake-specific and standard dialects."""
+
+    impl = SqlAlchemyJSON  # Default to standard SQLAlchemy JSON
+    # impl = VARIANT  # Default to Snowflake VARIANT
+
+    def load_dialect_impl(self, dialect):
+        """Load dialect-specific implementation."""
+        if dialect.name == "snowflake":
+            return VARIANT()
+        else:
+            return SqlAlchemyJSON()
diff --git a/aana/storage/models/caption.py b/aana/storage/models/caption.py
index 63b6fa84..f7213796 100644
--- a/aana/storage/models/caption.py
+++ b/aana/storage/models/caption.py
@@ -11,7 +11,7 @@
     from aana.core.models.captions import Caption
 
 
-caption_id_seq = Sequence("caption_id_seq", start=1, increment=1)
+caption_id_seq = Sequence("caption_id_seq", start=1, increment=1, optional=True)
 
 
 class CaptionEntity(BaseEntity, TimeStampEntity):
@@ -28,7 +28,9 @@ class CaptionEntity(BaseEntity, TimeStampEntity):
 
     __tablename__ = "caption"
 
-    id: Mapped[int] = mapped_column(caption_id_seq, primary_key=True)
+    id: Mapped[int] = mapped_column(
+        caption_id_seq, autoincrement=True, primary_key=True
+    )
     model: Mapped[str] = mapped_column(
         nullable=False, comment="Name of model used to generate the caption"
     )
diff --git a/aana/storage/models/task.py b/aana/storage/models/task.py
index 18204051..1ad6db12 100644
--- a/aana/storage/models/task.py
+++ b/aana/storage/models/task.py
@@ -1,17 +1,11 @@
-import re
 import uuid
 from enum import Enum
 
 from sqlalchemy import (
     UUID,
     PickleType,
-    event,
-    insert,
-    select,
 )
-from sqlalchemy.ext.compiler import compiles
 from sqlalchemy.orm import Mapped, mapped_column
-from sqlalchemy.sql import Insert
 
 from aana.storage.custom_types import JSON
 from aana.storage.models.base import BaseEntity, TimeStampEntity, timestamp
@@ -32,7 +26,6 @@ class TaskEntity(BaseEntity, TimeStampEntity):
     """Table for task items."""
 
     __tablename__ = "tasks"
-    __table_args__ = {"prefixes": ["HYBRID"]}
 
     id: Mapped[uuid.UUID] = mapped_column(
         UUID, primary_key=True, default=uuid.uuid4, comment="Task ID"
diff --git a/aana/storage/models/transcript.py b/aana/storage/models/transcript.py
index 625edb7d..33d55695 100644
--- a/aana/storage/models/transcript.py
+++ b/aana/storage/models/transcript.py
@@ -15,7 +15,7 @@
         AsrTranscriptionInfo,
     )
 
-transcript_id_seq = Sequence("transcript_id_seq", start=1, increment=1)
+transcript_id_seq = Sequence("transcript_id_seq", start=1, increment=1, optional=True)
 
 
 class TranscriptEntity(BaseEntity, TimeStampEntity):
@@ -33,7 +33,9 @@ class TranscriptEntity(BaseEntity, TimeStampEntity):
 
     __tablename__ = "transcript"
 
-    id: Mapped[int] = mapped_column(transcript_id_seq, primary_key=True)
+    id: Mapped[int] = mapped_column(
+        transcript_id_seq, autoincrement=True, primary_key=True
+    )
     model: Mapped[str] = mapped_column(
         nullable=False, comment="Name of model used to generate transcript"
     )
diff --git a/aana/storage/op.py b/aana/storage/op.py
index eecff7e7..47271d3f 100644
--- a/aana/storage/op.py
+++ b/aana/storage/op.py
@@ -1,4 +1,3 @@
-import json
 import typing
 from enum import Enum
 from pathlib import Path
@@ -19,7 +18,6 @@
 
 import re
 
-from snowflake.sqlalchemy.custom_types import OBJECT, VARIANT
 from sqlalchemy.ext.compiler import compiles
 from sqlalchemy.sql import Insert
 
diff --git a/aana/tests/conftest.py b/aana/tests/conftest.py
index f6692bf7..2243af1b 100644
--- a/aana/tests/conftest.py
+++ b/aana/tests/conftest.py
@@ -1,5 +1,6 @@
 # This file is used to define fixtures that are used in the integration tests.
 # ruff: noqa: S101
+import json
 import os
 import tempfile
 from pathlib import Path
@@ -10,7 +11,7 @@
 from pytest_postgresql import factories
 from sqlalchemy.orm import Session
 
-from aana.configs.db import DbSettings, PostgreSQLConfig, SQLiteConfig
+from aana.configs.db import DbSettings, PostgreSQLConfig, SnowflakeConfig, SQLiteConfig
 from aana.configs.settings import settings as aana_settings
 from aana.sdk import AanaSDK
 from aana.storage.op import DbType, run_alembic_migrations
@@ -211,7 +212,36 @@ def postgres_db_session(postgresql):
         yield session
 
 
-@pytest.fixture(params=["sqlite_db_session", "postgres_db_session"])
+@pytest.fixture(scope="function")
+def snowflake_db_session():
+    """Creates a new snowflake database and session for each test."""
+    SNOWFLAKE_TEST_PARAMETERS = os.environ.get("SNOWFLAKE_TEST_PARAMETERS")
+    if not SNOWFLAKE_TEST_PARAMETERS:
+        pytest.skip("Snowflake test parameters not found")
+
+    SNOWFLAKE_TEST_PARAMETERS = json.loads(SNOWFLAKE_TEST_PARAMETERS)
+
+    aana_settings.db_config.datastore_type = DbType.SNOWFLAKE
+    aana_settings.db_config.datastore_config = SnowflakeConfig(
+        **SNOWFLAKE_TEST_PARAMETERS
+    )
+    os.environ["DB_CONFIG"] = jsonify(aana_settings.db_config)
+
+    # Reset the engine
+    aana_settings.db_config._engine = None
+
+    # Run migrations to set up the schema
+    run_alembic_migrations(aana_settings)
+
+    # Create a new session
+    engine = aana_settings.db_config.get_engine()
+    with Session(engine) as session:
+        yield session
+
+
+@pytest.fixture(
+    params=["sqlite_db_session", "postgres_db_session", "snowflake_db_session"]
+)
 def db_session(request):
     """Iterate over different database type for db tests."""
     return request.getfixturevalue(request.param)
diff --git a/tests.dstack.yml b/tests.dstack.yml
index 8e43d8ee..303aba6d 100644
--- a/tests.dstack.yml
+++ b/tests.dstack.yml
@@ -8,6 +8,7 @@ image: nvidia/cuda:12.3.2-cudnn9-devel-ubuntu22.04
 
 env:
   - HF_TOKEN
+  - SNOWFLAKE_TEST_PARAMETERS
 
 commands:
   - apt-get update