How to force values in column be unique in SDV multi table HMASynthesizer?

Question

I got this table:

	id	name
0	0	Region_0
1	1	Region_1
2	2	Region_2
3	3	Region_3
4	4	Region_4
5	5	Region_5
6	6	Region_6
7	7	Region_7
8	8	Region_8
9	9	Region_9
10	10	Region_10
11	11	Region_11
12	12	Region_12
13	13	Region_13
14	14	Region_14
15	15	Region_15
16	16	Region_16
17	17	Region_17
18	18	Region_18
19	19	Region_19

I trying to make new data. Metadata for this table:

database_metadata.update_column(
    table_name='region',
    column_name='id',
    sdtype='id',
    regex_format='[0-9]{2}'
)

database_metadata.set_primary_key(
    table_name='region',
    column_name='id'
)

database_metadata.add_relationship(
    parent_table_name='region',
    child_table_name='users',
    parent_primary_key='id',
    child_foreign_key='region_id'
)


'region': {'primary_key': 'id',
   'columns': {'id': {'sdtype': 'id', 'regex_format': '[0-9]{2}'},
    'name': {'sdtype': 'categorical'}}}

I need to make region's names unique. How to put this logic in model?

P.S. The constraint class 'Unique' is not currently supported for multi-table synthesizers.