Dandiset "modified" timestamp not updated when entries deleted from Zarr

[jwodder]

When one or more entries are deleted from a Zarr via the DELETE /zarr/{zarr_id}/files/ endpoint — even if the Zarr is then reingested by calling POST /zarr/{zarr_id}/finalize/ — the "modified" properties of both the containing Dandiset and Dandiset version are not updated.

MVCE:

import os
from pathlib import Path
from tempfile import TemporaryDirectory
from time import sleep
from dandi.consts import dandiset_metadata_file
from dandi.dandiapi import DandiAPIClient
from dandi.files import dandi_file
import numpy as np
import zarr

with DandiAPIClient.for_dandi_instance(
    "dandi-staging", token=os.environ["DANDI_API_KEY"]
) as client:

    d = client.create_dandiset(
        "Test Zarr Dandiset",
        {
            "schemaKey": "Dandiset",
            "name": "Test Dandiset",
            "description": "A test Dandiset",
            "contributor": [
                {
                    "schemaKey": "Person",
                    "name": "Wodder, John",
                    "roleName": ["dcite:Author", "dcite:ContactPerson"],
                }
            ],
            "license": ["spdx:CC0-1.0"],
        },
    )

    dandiset_id = d.identifier
    print("DANDISET ID:", dandiset_id)
    try:
        with TemporaryDirectory() as tmpdir:
            dspath = Path(tmpdir)
            (dspath / dandiset_metadata_file).write_text(
                f"identifier: '{dandiset_id}'\n"
            )
            zarr.save(dspath / "sample.zarr", np.arange(1000), np.arange(1000, 0, -1))
            df = dandi_file(dspath / "sample.zarr", dandiset_path=dspath)
            print("Uploading Zarr ...")
            df.upload(d, {"path": "sample.zarr", "description": "A Zarr"})

            d.refresh()
            print("Dandiset modified at:", d.modified)
            print("Dandiset draft version modified at:", d.version.modified)

            print("Sleeping ...")
            sleep(3)

            (asset,) = d.get_assets()
            entry = next(asset.iterfiles())
            print("Deleting entry", entry, "from Zarr")
            asset.rmfiles([entry])

            d.refresh()
            print("Dandiset modified at:", d.modified)
            print("Dandiset draft version modified at:", d.version.modified)
    finally:
        print("Deleting Dandiset ...")
        d.delete()

Sample output:

DANDISET ID: 212987
Uploading Zarr ...
Dandiset modified at: 2024-02-26 14:06:12.328706+00:00
Dandiset draft version modified at: 2024-02-26 14:06:12.527791+00:00
Sleeping ...
Deleting entry .zgroup from Zarr
Dandiset modified at: 2024-02-26 14:06:12.328706+00:00
Dandiset draft version modified at: 2024-02-26 14:06:12.527791+00:00
Deleting Dandiset ...