zabbix=# \d host_discovery
                             Table "public.host_discovery"
    Column     |          Type          | Collation | Nullable |        Default
---------------+------------------------+-----------+----------+-----------------------
 hostid        | bigint                 |           | not null |
 parent_hostid | bigint                 |           |          |
 parent_itemid | bigint                 |           |          |
 host          | character varying(128) |           | not null | ''::character varying
 lastcheck     | integer                |           | not null | 0
 ts_delete     | integer                |           | not null | 0
Indexes:
    "host_discovery_pkey" PRIMARY KEY, btree (hostid)
Foreign-key constraints:
    "c_host_discovery_3" FOREIGN KEY (parent_itemid) REFERENCES items(itemid)