"""
Checkpoint system — Timeline + Checkpoint tree.

    detect/checkpoint/
        frames.py      — frame image S3 upload/download
        storage.py     — Timeline + Checkpoint (Postgres + MinIO)
        replay.py      — replay (TODO: migrate to new model)
        runner_bridge.py — checkpoint hook for PipelineRunner
"""

from .storage import (
    create_timeline,
    get_timeline_frames,
    get_timeline_frames_b64,
    save_stage_output,
    load_stage_output,
)
from .frames import save_frames, load_frames
from .runner_bridge import checkpoint_after_stage, reset_checkpoint_state, get_timeline_id