send log: rows belong to a domain by id (audit L12, 0008)

A domain user's log, the message page, a domain's statistics, the level-2
count and the notifier's refusal count picked send-log rows by domain name,
so a domain deleted and re-added under its old name showed its earlier mail
to the next assignee and went on counting it.

Migration 0008 (not run on the live database yet, so extended here):
send_log.domain_id and inbound_spam_log.inbound_domain_id, REFERENCES ...
ON DELETE SET NULL, filled once by name from the registry as it is at
migration time, each with an (id, created_at) index.

- Writes: InsertQueued / InsertRejected set domain_id to the domain of the
  row's login (loginDomainID) - the journal milter and the sender check's
  refusal rows both go through them; the inbound journal sets
  inbound_domain_id from the inbound domain's name at insert.
- Reads: SendLogFilter.DomainIDs (was Domains, by name) and
  InboundSpamFilter.DomainIDs are the scope; the global role still reads
  everything. The message page checks row.DomainID against the user's
  domains. DomainSendStats and CountMessages keep their name argument and
  select domain_id = (SELECT id FROM domains WHERE name = ?). The notifier
  joins send_log.domain_id to the domain and its application.
- DMARC reports stay by name on purpose (a report is about the DNS name).

Tests: store - scope by ids; a re-added domain's log, level-2 count and
statistics hold its own row only, the global log both; inbound scope by
ids. Handlers - the new assignee gets 404 for the old row's page and does
not see it in the log, the global role sees both. Tests that wrote rows for
a login that is no application now register it (a row is a domain's through
its application). Schema at 0008 with the two columns and indexes.

schema-migrations row 8, CHANGELOG [Unreleased], audit plan line ticked,
roadmap 19/62.
Evidence: go vet ./... clean; go test ./... ok locally but for the two
Windows-only tests; the server run follows before the push.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/web/handlers/handlers_users_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/mixeme/selfpost/internal/store"
+	"github.com/mixeme/selfpost/internal/web/auth"
 )
 
 // The users form's writes, driven through the handlers (audit 2026-10-12, M7
@@ -97,3 +98,55 @@ func TestUserFormCreatesWithEmailAndReach(t *testing.T) {
 		t.Fatalf("created %+v", u)
 	}
 }
+
+// A domain deleted and added again under its old name starts with an empty
+// log for whoever it is assigned to; its earlier rows are the global role's
+// alone (audit 2026-10-12, L12).
+func TestADomainAddedAgainShowsItsAssigneeNothingOld(t *testing.T) {
+	h, st := inboundHandlers(t)
+	root := userWith(t, st, "root", store.RoleGlobal, store.Reach{})
+	old, _ := st.AddDomain("shop.example", "mail")
+	st.AddApplication(old.ID, "shop", store.AddressModeWildcard, nil)
+	if err := st.InsertQueued(store.SendLogEntry{QueueID: "OLDQ", Domain: "shop.example", AppLogin: "shop", To: "a@example.net", Subject: "old mail"}); err != nil {
+		t.Fatal(err)
+	}
+	if err := st.DeleteDomain(old.ID); err != nil {
+		t.Fatal(err)
+	}
+	again, _ := st.AddDomain("shop.example", "mail")
+	st.AddApplication(again.ID, "shop", store.AddressModeWildcard, nil)
+	if err := st.InsertQueued(store.SendLogEntry{QueueID: "NEWQ", Domain: "shop.example", AppLogin: "shop", To: "a@example.net", Subject: "new mail"}); err != nil {
+		t.Fatal(err)
+	}
+	owner := userWith(t, st, "owner", store.RoleDomain, store.Reach{DomainIDs: []int64{again.ID}})
+	rows, _ := st.QuerySendLog(store.SendLogFilter{AllDomains: true}, 10, 0)
+	var oldID, newID int64
+	for _, r := range rows {
+		if r.QueueID == "OLDQ" {
+			oldID = r.ID
+		} else {
+			newID = r.ID
+		}
+	}
+
+	page := func(p *auth.Principal, id int64) int {
+		return send(h.HandleDelivery, p, "GET", "/outbound/log/"+idStr(id), map[string]string{"id": idStr(id)}, nil).Code
+	}
+	if code := page(&owner, oldID); code != http.StatusNotFound {
+		t.Errorf("the old row's page for the new assignee = %d, want 404", code)
+	}
+	if code := page(&owner, newID); code != http.StatusOK {
+		t.Errorf("the new row's page for its assignee = %d, want 200", code)
+	}
+	if code := page(&root, oldID); code != http.StatusOK {
+		t.Errorf("the old row's page for the global role = %d, want 200", code)
+	}
+	body := send(h.HandleDeliveries, &owner, "GET", "/outbound/log", nil, nil).Body.String()
+	if strings.Contains(body, "old mail") || !strings.Contains(body, "new mail") {
+		t.Errorf("the new assignee's log shows the old row or misses the new one")
+	}
+	body = send(h.HandleDeliveries, &root, "GET", "/outbound/log", nil, nil).Body.String()
+	if !strings.Contains(body, "old mail") || !strings.Contains(body, "new mail") {
+		t.Errorf("the global log is missing a row")
+	}
+}