How does the @persist decorator enable state recovery across Flow executions?

Without persistence, an interrupted Flow, whether from a crash, a restart, or a long-running pause, would simply lose all of its accumulated state and have to start from the beginning.

• @persist saves the Flow's state, including its unique identifier and any stored data, to a backing store as execution proceeds
• Uses SQLite by default, suitable for single-instance deployments
• Can be configured for PostgreSQL when running across multiple instances in production, so state isn't tied to a single machine

This is what makes long-running or interruption-prone workflows, like ones that pause for @human_feedback, actually viable in production rather than fragile to any hiccup along the way.

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