feat(db): Support a direct address association to a Target

internal/db/sqltest/tests/session/delete_session_host_set.sql

@@ -0,0 +1,25 @@
+begin;
+  select plan(9);
+
+  -- Ensure session state table is populated
+  select is(count(*), 1::bigint) from session_state where session_id = 's1_____clare' and state='pending';
+  select is(count(*), 1::bigint) from session_state where session_id = 's1_____cindy' and state='terminated';
+  select is(count(*), 1::bigint) from session_state where session_id = 's1_____ciara' and state='canceling';
+  select is(count(*), 1::bigint) from session_state where session_id = 's1_____carly' and state='active';
+
+  -- Check that we have 4 sessions using this host set
+  select is(count(*), 4::bigint) from session_host_set_host where host_set_id = 's___1cb-sths';
+  
+  -- Delete host set, expect no errors
+  delete from host_set where public_id = 's___1cb-sths';
+  select is(count(*), 0::bigint) from host_set where public_id = 's___1cb-sths';
+
+  -- Ensure we no longer have sessions associated with this host set
+  select is(count(*), 0::bigint) from session_host_set_host where host_set_id = 's___1cb-sths';
+
+  -- Ensure sessions that were pending or active are now in canceling state
+  select is(count(*), 1::bigint) from session_state where state = 'canceling' and session_id = 's1_____clare';
+  select is(count(*), 1::bigint) from session_state where state = 'canceling' and session_id = 's1_____carly';
+
+  select * from finish();
+rollback;