Crate tensor_checkpoint 

TensorCheckpoint - Rollback/Checkpoint System for Neumann

Provides checkpoint and rollback capabilities for the Neumann database:

• Auto-checkpoints before destructive operations
• Manual CHECKPOINT command for user-initiated snapshots
• Interactive confirmation with preview of affected data
• Count-based retention with automatic purge

Checkpoints are stored on disk via FileCheckpointStore.

Re-exports

pub use file_store::FileCheckpointStore;

Modules

file_store

File-based checkpoint storage backend.

Structs

AutoConfirm

No-op confirmation handler that always confirms.

AutoReject

Confirmation handler that always rejects (for testing).

CheckpointConfig

Configuration for the checkpoint manager.

CheckpointInfo

Lightweight checkpoint descriptor returned by list operations.

CheckpointManager

Central coordinator for creating, listing, restoring, and deleting checkpoints.

CheckpointMetadata

Metadata captured at checkpoint time summarizing what the store contained.

CheckpointState

Full checkpoint state including the serialized store snapshot.

CheckpointTrigger

Records which destructive operation triggered an auto-checkpoint.

GraphMeta

Graph engine statistics at checkpoint time.

OperationPreview

Preview of a destructive operation shown to the user before confirmation.

PreviewGenerator

Generates human-readable previews for destructive operations.

RelationalMeta

Relational engine statistics at checkpoint time.

RetentionManager

Enforces a count-based retention policy, deleting the oldest checkpoints beyond the limit.

VectorMeta

Vector engine statistics at checkpoint time.

Enums

CheckpointError

Errors that can occur during checkpoint operations.

DestructiveOp

Classifies the type of destructive operation for checkpoint and confirmation purposes.

Traits

CheckpointStore

Abstraction over checkpoint persistence.

ConfirmationHandler

Trait for handling confirmation prompts before destructive operations.

Functions

format_confirmation_prompt

Build a full confirmation prompt including warning, summary, sample data, and input prompt.

format_warning

Format a warning message for a destructive operation.

Type Aliases

Result

Convenience alias for checkpoint operations.