"""
Checkpoint system — Timeline + Checkpoint tree + StageOutput.

    detect/checkpoint/
        frames.py        — per-timeline frame cache (local filesystem)
        storage.py       — Timeline, Checkpoint, StageOutput persistence
        replay.py        — replay from checkpoint (TODO: rework in 5d)
        runner_bridge.py — checkpoint hook for PipelineRunner
"""

from .storage import (
    create_timeline,
    get_timeline,
    update_timeline_status,
    save_checkpoint,
    get_checkpoints_for_job,
    get_checkpoints_for_timeline,
    save_stage_output,
    load_stage_output,
    load_stage_outputs_for_job,
    load_stage_outputs_for_timeline,
)
from .frames import (
    cache_exists,
    cache_frames,
    load_cached_frames,
    load_cached_frames_b64,
    clear_cache,
    frames_to_b64,
)
from .runner_bridge import checkpoint_after_stage, reset_checkpoint_state, get_latest_checkpoint