Metadata commands don't work

Tutorial commands give nothing:

```bash
rucio did list --filter 'electron_beam_energy_gev==10' 'epic:*'
rucio did list --filter 'electron_beam_energy_gev==10, ion_beam_energy_gev==250' 'epic:*'
```

Also, when I look at background files:

```bash
jug_dev> romanov@ifarm2402:/w/eic-scshelf2104/users/romanov/meson-structure-work$ rucio did metadata list epic:/RECO/26.03.0/epic_craterlake/Bkg_Exact1S_2us/GoldCt/10um/DIS/NC/10x275/minQ2=1
access_cnt: None
accessed_at: None
account: eicprod
adler32: None
availability: AVAILABLE
bytes: None
campaign: None
closed_at: None
complete: None
constituent: None
created_at: 2026-04-01 02:46:22
datatype: None
deleted_at: None
did_type: DATASET
eol_at: None
events: None
expired_at: None
guid: None
hidden: False
is_archive: None
is_new: False
is_open: True
length: None
lumiblocknr: None
md5: None
monotonic: False
name: /RECO/26.03.0/epic_craterlake/Bkg_Exact1S_2us/GoldCt/10um/DIS/NC/10x275/minQ2=1
obsolete: False
panda_id: None
phys_group: None
prod_step: None
project: None
provenance: None
purge_replicas: True
run_number: None
scope: epic
stream_name: None
suppressed: False
task_id: None
transient: False
updated_at: 2026-04-01 02:46:26
version: None
```

I don't see background flag metadata