Edit subnet in UniFi without a gateway

unifi-network-config.mongo

# mongodump --port 27117 --db ace --out "/srv/mongodb-backup-$(date +%Y%m%d)"
# mongo --port 27117
use ace

# Find network by name
db.networkconf.find({name: "Default"})

# Some of these settings can't be set in the UI without a UniFi gateway,
# but manually setting the `"purpose": "corporate"` makes the subnet
# visible (for reference).
db.networkconf.update(
    {name: "NetworkName"},
    {$set: {
        "purpose": "corporate",
        "ip_subnet": "192.168.X.1/24",
        "dhcpd_enabled": false,
        "dhcp_relay_enabled": false,
        "dhcpguard_enabled": true,
        "dhcpd_ip_1": "192.168.X.1",
        "dhcpd_ip_2": "192.168.X.2",
        "dhcpd_ip_3": "192.168.X.3",
        "dhcpd_start": "192.168.X.128",
        "dhcpd_stop": "192.168.X.199",
        "dhcpd_leasetime": "3601",
        "networkgroup": "LAN",
        "setting_preference": "manual"
    }}
)

# Does nothing, but also doesn't harm if `"ipv6_interface_type": "none"`.
# Meanwhile if you set `"ipv6_interface_type": "pd", you can't save the
# the settings anymore.
db.networkconf.update({name: "Default"}, {$set: { "ipv6_pd_prefixid": "1" }})

# Some other settings that probably do nothing without a gateway
db.networkconf.update(
    {name: "Default"},
    {$set: {
        "is_nat": true,
        "internet_access_enabled": true,
        "ipv6_enabled": true,
        "auto_scale_enabled": false,
        "ipv6_pd_auto_prefixid_enabled": false
    }}
)

My UniFi controller somehow didn't let me edit the DHCP guard settings on some subnets, so I went to edit them directly in the database. While doing that (and looking at the Default network for reference) I noticed that I can make the subnet range visible in the UI by setting the purpose to corporate. It doesn't seem to have any ill effects, since I don't have and won't have a UniFi gateway, but it's nice to have the reference visible. And now I can use the DHCP manager to edit the DHCP guard settings, and there it works.