create_session bug #4419

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Describe the Bug:
when i executed :
test_session = await db_session_service.create_session(
app_name="test_app",
user_id="test_user",
session_id="test_session_001"
)

i got the error:
DBAPIError: (sqlalchemy.dialects.postgresql.asyncpg.Error) <class 'asyncpg.exceptions.DataError'>: invalid input for query argument $5: datetime.datetime(2026, 2, 9, 3, 16, 48,... (can't subtract offset-naive and offset-aware datetimes)
[SQL: INSERT INTO sessions (app_name, user_id, id, state, create_time, update_time) VALUES ($1::VARCHAR, $2::VARCHAR, $3::VARCHAR, $4::JSONB, $5::TIMESTAMP WITHOUT TIME ZONE, $6::TIMESTAMP WITHOUT TIME ZONE)]
[parameters: ('test_app', 'test_user', 'test_session_001', '{}', datetime.datetime(2026, 2, 9, 3, 16, 48, 817695, tzinfo=datetime.timezone.utc), datetime.datetime(2026, 2, 9, 3, 16, 48, 817695, tzinfo=datetime.timezone.utc))]
(Background on this error at: https://sqlalche.me/e/20/dbapi)

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Environment Details:

• ADK Library Version (pip show google-adk):1.24.1
• Desktop OS:** [e.g., macOS, Linux, Windows]:windows
• Python Version (python -V):12.0

Model Information:

• Are you using LiteLLM: Yes
• Which model is being used: (e.g., gemini-2.5-pro)

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