Options with space dont get encapsulated from hosts database

Describe the bug

I have static option-definitions for ipxe namespace, from #2366 (comment 284084). Then, I have a few records for my host reservation in postgresql database, as the dump shows:

COPY public.dhcp4_options (option_id, code, value, formatted_value, space, persistent, dhcp_client_class, dhcp4_subnet_id, host_id, scope_id, user_context, shared_network_name, pool_id, modification_ts) FROM stdin;
18	175	\N	\N	\N	f	\N	\N	4	3	\N	\N	\N	2023-04-01 13:15:54.656377+00
21	190	\\x69736373692d626f6f74	\N	ipxe	f	\N	\N	4	3	\N	\N	\N	2023-04-01 14:24:30.740714+00
22	191	\\x694b454d65784e6961663364	\N	ipxe	f	\N	\N	4	3	\N	\N	\N	2023-04-01 14:24:39.73297+00
23	203	\\x69716e2e323032322d30342e636c6f75642e6b776562733a6666	\N	\N	f	\N	\N	4	3	\N	\N	\N	2023-04-01 14:26:14.582959+00
24	17	\\x69736373693a3139322e3136382e382e36353a3a3a3a69716e2e323030352d31302e6f72672e667265656e61732e63746c3a69736373692d626f6f74	\N	\N	f	\N	\N	4	3	\N	\N	\N	2023-04-01 14:29:07.290341+00
25	176	\\x01	\N	ipxe	f	\N	\N	4	3	\N	\N	\N	2023-04-01 14:31:35.581516+00
\.

Howewer, options in space ipxe dont get added, encapsulated.

To Reproduce Steps to reproduce the behavior:

1. Run Kea dhcpv4 with debug logging

2. Start up a vm with kvm without disk to boot with pxe

3. Observe debug output Expected behavior Expected the same behavior with the following static configuration snippet:

4. See that option 170 is requested, howewer the response contains an empty value for that option.

"reservations": [
{
"hw-address": "00:11:...",
"option-data": [
{
 "code": 175
},
{
 "code": 190,
 "space": "ipxe",
 "data": "iscsi-boot"
}
...
]
}
]

Environment:

• Kea version: 2.2.0
• OS: Debian 11
• Compiled with postgresql backend
• No hook libraries

Additional Information

Seems that this little patch would fix my issue:

diff --git a/src/lib/dhcpsrv/pgsql_host_data_source.cc b/src/lib/dhcpsrv/pgsql_host_data_source.cc
index a1251be692..5c438aac17 100644
--- a/src/lib/dhcpsrv/pgsql_host_data_source.cc
+++ b/src/lib/dhcpsrv/pgsql_host_data_source.cc
@@ -2530,6 +2530,11 @@ PgSqlHostDataSourceImpl::getHostCollection(PgSqlHostContextPtr& ctx,
                       << tagged_statements[stindex].name);
         }
     }
+
+    for (auto& host : result) {
+        boost::const_pointer_cast<Host>(host)->getCfgOption4()->encapsulate();
+        boost::const_pointer_cast<Host>(host)->getCfgOption6()->encapsulate();
+    }
 }
 
 ConstHostPtr