feat(store): persist per-domain custom record marks

internal/store/db/models.go

@@ -17,6 +17,13 @@ type CheckRun struct {
 	CreatedAt pgtype.Timestamptz `json:"created_at"`
 }
 
+type DomainCustomRecord struct {
+	DomainID  uuid.UUID          `json:"domain_id"`
+	RecordKey string             `json:"record_key"`
+	Note      string             `json:"note"`
+	CreatedAt pgtype.Timestamptz `json:"created_at"`
+}
+
 type Domain struct {
 	ID                uuid.UUID          `json:"id"`
 	ProjectID         uuid.UUID          `json:"project_id"`