feat: Add SqliteSessionService and a migration script to migrate existing DB using DatabaseSessionService to SqliteSessionService

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The new Sqlite version has fixed schema and use a single column to store Event data, this should avoid DB migration for future add to the Event object.

- This change introduces `SqliteSessionService`, an asynchronous session service using `aiosqlite` that stores event data as JSON within SQLite.
- A migration script, `migrate_from_sqlalchemy_sqlite.py`, is included to transition data from the older SQLAlchemy-based SQLite schema to this new format.
- The CLI service registry is updated to use SqliteSessionService for sqlite:// URIs.
- Throw error when user trying to access a legacy DB and advice the user to do the migration.

Co-authored-by: Shangjie Chen <deanchen@google.com>
PiperOrigin-RevId: 829971174

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This commit is contained in:

Shangjie Chen

2025-11-08 21:19:38 -08:00

committed by Copybara-Service

parent 50ceda00cf

commit e218254495

6 changed files with 850 additions and 48 deletions

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src/google/adk/sessions/sqlite_session_service.py

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