When @persist is applied at the class level, new flow instances now
automatically load the most recent persisted state for that flow class.
This matches the documented behavior where creating a new instance of a
@persist-decorated flow seamlessly continues from the previous run's state.
Changes:
- Add load_latest_by_class() to FlowPersistence base class
- Implement load_latest_by_class() in SQLiteFlowPersistence with
flow_class column and index for efficient lookups
- Store flow class name when persisting state via PersistenceDecorator
- Auto-restore latest state in class-level @persist decorator's __init__
- Add migration for existing databases (ALTER TABLE ADD COLUMN)
Fixes#5378
Co-Authored-By: João <joao@crewai.com>
a24b011f6f