Module persistence 

Agent Persistence and State Management

This module provides comprehensive persistence capabilities for AI agents:

• State Snapshots: Serialize and restore complete agent state
• Conversation History: Store and retrieve conversation threads
• Checkpointing: Automatic and manual checkpoints for recovery
• State Versioning: Track state changes over time
• Storage Backends: SQLite, file-based, and in-memory options
• Migration Support: Handle schema changes between versions

Structs

AgentState

Agent state that can be persisted

Attachment

An attachment to a message

Checkpoint

A checkpoint for recovery

CheckpointConfig

Configuration for automatic checkpointing

Conversation

A conversation thread

FileBackend

File-based persistence backend

MemoryBackend

In-memory persistence backend (for testing)

Message

A message in a conversation

PersistenceManager

Main persistence manager

StorageStats

Storage statistics

ToolCall

A tool call made by the agent

Enums

AttachmentType

CheckpointType

MessageRole

ToolCallStatus

Traits

PersistenceBackend

Storage backend for persistence

Functions

persistence_builtins

Create builtin functions for persistence

Type Aliases

AgentId

Unique identifier for agent instances

CheckpointId

Unique identifier for checkpoints

ConversationId

Unique identifier for conversations