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Filipe Caixeta
19b607684f
Merge https://github.com/google/adk-python/pull/4365
## Summary
- Fixes `DataError` when using PostgreSQL with `asyncpg` for session storage
- PostgreSQL's default `TIMESTAMP` type is `WITHOUT TIME ZONE`, which cannot accept timezone-aware datetime objects
- The existing code handled this for SQLite but not PostgreSQL - this fix applies the same timezone stripping
## Error
When creating a session with PostgreSQL + asyncpg, the following error occurs:
```
sqlalchemy.dialects.postgresql.asyncpg.Error: <class 'asyncpg.exceptions.DataError'>:
invalid input for query argument $5: datetime.datetime(2026, 2, 3, 21, 32, 50, 353909,
tzinfo=datetime.timezone.utc) (can't subtract offset-naive and offset-aware datetimes)
```
During the INSERT:
```sql
INSERT INTO sessions (app_name, user_id, id, state, create_time, update_time)
VALUES ($1, $2, $3, $4, $5, $6)
```
Where `$5` and `$6` are timezone-aware datetimes being inserted into `TIMESTAMP WITHOUT TIME ZONE` columns.
## Root Cause
Commit 1063fa53 changed from database-generated timestamps (`func.now()`) to explicit Python datetimes (`datetime.now(timezone.utc)`). The SQLite case was handled by stripping the timezone, but PostgreSQL was overlooked.
## Test plan
- [x] Verified fix resolves the error when creating sessions with PostgreSQL + asyncpg
- [ ] Existing unit tests pass
Fixes regression from #1733
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/4365 from filipecaixeta:fix-postgresql-timestamp-timezone 9d788ba99e7167a53962d93e59a80f78af091ca9
PiperOrigin-RevId: 867800330