diff --git a/cmd/publish_test.go b/cmd/publish_test.go
index 1c6a14a4..6c3b9ce2 100644
--- a/cmd/publish_test.go
+++ b/cmd/publish_test.go
@@ -86,6 +86,7 @@ func TestCLI_Publish_All_The_Things(t *testing.T) {
 }
 
 func TestCLI_Publish_Wait_PID_And_Cmd(t *testing.T) {
+	t.Parallel()
 	s, port := test.StartServer(t)
 	defer test.StopServer(t, s, port)
 	topic := fmt.Sprintf("http://127.0.0.1:%d/mytopic", port)
diff --git a/cmd/serve_test.go b/cmd/serve_test.go
index 774166c3..fceed471 100644
--- a/cmd/serve_test.go
+++ b/cmd/serve_test.go
@@ -22,6 +22,7 @@ func init() {
 }
 
 func TestCLI_Serve_Unix_Curl(t *testing.T) {
+	t.Parallel()
 	sockFile := filepath.Join(t.TempDir(), "ntfy.sock")
 	configFile := newEmptyFile(t) // Avoid issues with existing server.yml file on system
 	go func() {
diff --git a/log/types.go b/log/types.go
index dc1d2f3b..fd676371 100644
--- a/log/types.go
+++ b/log/types.go
@@ -102,6 +102,13 @@ type Contexter interface {
 // Context represents an object's state in the form of key-value pairs
 type Context map[string]any
 
+// Merge merges other into this context
+func (c Context) Merge(other Context) {
+	for k, v := range other {
+		c[k] = v
+	}
+}
+
 type levelOverride struct {
 	value string
 	level Level
diff --git a/server/errors.go b/server/errors.go
index f147e071..fc0dfa6a 100644
--- a/server/errors.go
+++ b/server/errors.go
@@ -13,6 +13,7 @@ type errHTTP struct {
 	HTTPCode int    `json:"http"`
 	Message  string `json:"error"`
 	Link     string `json:"link,omitempty"`
+	context  log.Context
 }
 
 func (e errHTTP) Error() string {
@@ -25,71 +26,106 @@ func (e errHTTP) JSON() string {
 }
 
 func (e errHTTP) Context() log.Context {
-	return log.Context{
+	context := log.Context{
 		"error":       e.Message,
 		"error_code":  e.Code,
 		"http_status": e.HTTPCode,
 	}
+	for k, v := range e.context {
+		context[k] = v
+	}
+	return context
 }
 
-func wrapErrHTTP(err *errHTTP, message string, args ...any) *errHTTP {
-	return &errHTTP{
-		Code:     err.Code,
-		HTTPCode: err.HTTPCode,
-		Message:  fmt.Sprintf("%s, %s", err.Message, fmt.Sprintf(message, args...)),
-		Link:     err.Link,
+func (e errHTTP) Wrap(message string, args ...any) *errHTTP {
+	clone := e.clone()
+	clone.Message = fmt.Sprintf("%s, %s", clone.Message, fmt.Sprintf(message, args...))
+	return &clone
+}
+
+func (e errHTTP) With(contexters ...log.Contexter) *errHTTP {
+	c := e.clone()
+	if c.context == nil {
+		c.context = make(log.Context)
+	}
+	for _, contexter := range contexters {
+		c.context.Merge(contexter.Context())
+	}
+	return &c
+}
+
+func (e errHTTP) Fields(context log.Context) *errHTTP {
+	c := e.clone()
+	if c.context == nil {
+		c.context = make(log.Context)
+	}
+	c.context.Merge(context)
+	return &c
+}
+
+func (e errHTTP) clone() errHTTP {
+	context := make(log.Context)
+	for k, v := range e.context {
+		context[k] = v
+	}
+	return errHTTP{
+		Code:     e.Code,
+		HTTPCode: e.HTTPCode,
+		Message:  e.Message,
+		Link:     e.Link,
+		context:  context,
 	}
 }
 
 var (
-	errHTTPBadRequest                                = &errHTTP{40000, http.StatusBadRequest, "invalid request", ""}
-	errHTTPBadRequestEmailDisabled                   = &errHTTP{40001, http.StatusBadRequest, "e-mail notifications are not enabled", "https://ntfy.sh/docs/config/#e-mail-notifications"}
-	errHTTPBadRequestDelayNoCache                    = &errHTTP{40002, http.StatusBadRequest, "cannot disable cache for delayed message", ""}
-	errHTTPBadRequestDelayNoEmail                    = &errHTTP{40003, http.StatusBadRequest, "delayed e-mail notifications are not supported", ""}
-	errHTTPBadRequestDelayCannotParse                = &errHTTP{40004, http.StatusBadRequest, "invalid delay parameter: unable to parse delay", "https://ntfy.sh/docs/publish/#scheduled-delivery"}
-	errHTTPBadRequestDelayTooSmall                   = &errHTTP{40005, http.StatusBadRequest, "invalid delay parameter: too small, please refer to the docs", "https://ntfy.sh/docs/publish/#scheduled-delivery"}
-	errHTTPBadRequestDelayTooLarge                   = &errHTTP{40006, http.StatusBadRequest, "invalid delay parameter: too large, please refer to the docs", "https://ntfy.sh/docs/publish/#scheduled-delivery"}
-	errHTTPBadRequestPriorityInvalid                 = &errHTTP{40007, http.StatusBadRequest, "invalid priority parameter", "https://ntfy.sh/docs/publish/#message-priority"}
-	errHTTPBadRequestSinceInvalid                    = &errHTTP{40008, http.StatusBadRequest, "invalid since parameter", "https://ntfy.sh/docs/subscribe/api/#fetch-cached-messages"}
-	errHTTPBadRequestTopicInvalid                    = &errHTTP{40009, http.StatusBadRequest, "invalid request: topic invalid", ""}
-	errHTTPBadRequestTopicDisallowed                 = &errHTTP{40010, http.StatusBadRequest, "invalid request: topic name is not allowed", ""}
-	errHTTPBadRequestMessageNotUTF8                  = &errHTTP{40011, http.StatusBadRequest, "invalid message: message must be UTF-8 encoded", ""}
-	errHTTPBadRequestAttachmentURLInvalid            = &errHTTP{40013, http.StatusBadRequest, "invalid request: attachment URL is invalid", "https://ntfy.sh/docs/publish/#attachments"}
-	errHTTPBadRequestAttachmentsDisallowed           = &errHTTP{40014, http.StatusBadRequest, "invalid request: attachments not allowed", "https://ntfy.sh/docs/config/#attachments"}
-	errHTTPBadRequestAttachmentsExpiryBeforeDelivery = &errHTTP{40015, http.StatusBadRequest, "invalid request: attachment expiry before delayed delivery date", "https://ntfy.sh/docs/publish/#scheduled-delivery"}
-	errHTTPBadRequestWebSocketsUpgradeHeaderMissing  = &errHTTP{40016, http.StatusBadRequest, "invalid request: client not using the websocket protocol", "https://ntfy.sh/docs/subscribe/api/#websockets"}
-	errHTTPBadRequestMessageJSONInvalid              = &errHTTP{40017, http.StatusBadRequest, "invalid request: request body must be message JSON", "https://ntfy.sh/docs/publish/#publish-as-json"}
-	errHTTPBadRequestActionsInvalid                  = &errHTTP{40018, http.StatusBadRequest, "invalid request: actions invalid", "https://ntfy.sh/docs/publish/#action-buttons"}
-	errHTTPBadRequestMatrixMessageInvalid            = &errHTTP{40019, http.StatusBadRequest, "invalid request: Matrix JSON invalid", "https://ntfy.sh/docs/publish/#matrix-gateway"}
-	errHTTPBadRequestIconURLInvalid                  = &errHTTP{40021, http.StatusBadRequest, "invalid request: icon URL is invalid", "https://ntfy.sh/docs/publish/#icons"}
-	errHTTPBadRequestSignupNotEnabled                = &errHTTP{40022, http.StatusBadRequest, "invalid request: signup not enabled", "https://ntfy.sh/docs/config"}
-	errHTTPBadRequestNoTokenProvided                 = &errHTTP{40023, http.StatusBadRequest, "invalid request: no token provided", ""}
-	errHTTPBadRequestJSONInvalid                     = &errHTTP{40024, http.StatusBadRequest, "invalid request: request body must be valid JSON", ""}
-	errHTTPBadRequestPermissionInvalid               = &errHTTP{40025, http.StatusBadRequest, "invalid request: incorrect permission string", ""}
-	errHTTPBadRequestIncorrectPasswordConfirmation   = &errHTTP{40026, http.StatusBadRequest, "invalid request: password confirmation is not correct", ""}
-	errHTTPBadRequestNotAPaidUser                    = &errHTTP{40027, http.StatusBadRequest, "invalid request: not a paid user", ""}
-	errHTTPBadRequestBillingRequestInvalid           = &errHTTP{40028, http.StatusBadRequest, "invalid request: not a valid billing request", ""}
-	errHTTPBadRequestBillingSubscriptionExists       = &errHTTP{40029, http.StatusBadRequest, "invalid request: billing subscription already exists", ""}
-	errHTTPNotFound                                  = &errHTTP{40401, http.StatusNotFound, "page not found", ""}
-	errHTTPUnauthorized                              = &errHTTP{40101, http.StatusUnauthorized, "unauthorized", "https://ntfy.sh/docs/publish/#authentication"}
-	errHTTPForbidden                                 = &errHTTP{40301, http.StatusForbidden, "forbidden", "https://ntfy.sh/docs/publish/#authentication"}
-	errHTTPConflictUserExists                        = &errHTTP{40901, http.StatusConflict, "conflict: user already exists", ""}
-	errHTTPConflictTopicReserved                     = &errHTTP{40902, http.StatusConflict, "conflict: access control entry for topic or topic pattern already exists", ""}
-	errHTTPConflictSubscriptionExists                = &errHTTP{40903, http.StatusConflict, "conflict: topic subscription already exists", ""}
-	errHTTPEntityTooLargeAttachment                  = &errHTTP{41301, http.StatusRequestEntityTooLarge, "attachment too large, or bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPEntityTooLargeMatrixRequest               = &errHTTP{41302, http.StatusRequestEntityTooLarge, "Matrix request is larger than the max allowed length", ""}
-	errHTTPEntityTooLargeJSONBody                    = &errHTTP{41303, http.StatusRequestEntityTooLarge, "JSON body too large", ""}
-	errHTTPTooManyRequestsLimitRequests              = &errHTTP{42901, http.StatusTooManyRequests, "limit reached: too many requests, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitEmails                = &errHTTP{42902, http.StatusTooManyRequests, "limit reached: too many emails, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitSubscriptions         = &errHTTP{42903, http.StatusTooManyRequests, "limit reached: too many active subscriptions, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitTotalTopics           = &errHTTP{42904, http.StatusTooManyRequests, "limit reached: the total number of topics on the server has been reached, please contact the admin", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitAttachmentBandwidth   = &errHTTP{42905, http.StatusTooManyRequests, "limit reached: daily bandwidth reached", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitAccountCreation       = &errHTTP{42906, http.StatusTooManyRequests, "limit reached: too many accounts created", "https://ntfy.sh/docs/publish/#limitations"} // FIXME document limit
-	errHTTPTooManyRequestsLimitReservations          = &errHTTP{42907, http.StatusTooManyRequests, "limit reached: too many topic reservations for this user", ""}
-	errHTTPTooManyRequestsLimitMessages              = &errHTTP{42908, http.StatusTooManyRequests, "limit reached: daily message quota reached", "https://ntfy.sh/docs/publish/#limitations"}
-	errHTTPTooManyRequestsLimitAuthFailure           = &errHTTP{42909, http.StatusTooManyRequests, "limit reached: too many auth failures", "https://ntfy.sh/docs/publish/#limitations"} // FIXME document limit
-	errHTTPInternalError                             = &errHTTP{50001, http.StatusInternalServerError, "internal server error", ""}
-	errHTTPInternalErrorInvalidPath                  = &errHTTP{50002, http.StatusInternalServerError, "internal server error: invalid path", ""}
-	errHTTPInternalErrorMissingBaseURL               = &errHTTP{50003, http.StatusInternalServerError, "internal server error: base-url must be be configured for this feature", "https://ntfy.sh/docs/config/"}
-	errHTTPInsufficientStorage                       = &errHTTP{50701, http.StatusInsufficientStorage, "internal server error: cannot publish to UnifiedPush topic without previously active subscriber", ""}
+	errHTTPBadRequest                                = &errHTTP{40000, http.StatusBadRequest, "invalid request", "", nil}
+	errHTTPBadRequestEmailDisabled                   = &errHTTP{40001, http.StatusBadRequest, "e-mail notifications are not enabled", "https://ntfy.sh/docs/config/#e-mail-notifications", nil}
+	errHTTPBadRequestDelayNoCache                    = &errHTTP{40002, http.StatusBadRequest, "cannot disable cache for delayed message", "", nil}
+	errHTTPBadRequestDelayNoEmail                    = &errHTTP{40003, http.StatusBadRequest, "delayed e-mail notifications are not supported", "", nil}
+	errHTTPBadRequestDelayCannotParse                = &errHTTP{40004, http.StatusBadRequest, "invalid delay parameter: unable to parse delay", "https://ntfy.sh/docs/publish/#scheduled-delivery", nil}
+	errHTTPBadRequestDelayTooSmall                   = &errHTTP{40005, http.StatusBadRequest, "invalid delay parameter: too small, please refer to the docs", "https://ntfy.sh/docs/publish/#scheduled-delivery", nil}
+	errHTTPBadRequestDelayTooLarge                   = &errHTTP{40006, http.StatusBadRequest, "invalid delay parameter: too large, please refer to the docs", "https://ntfy.sh/docs/publish/#scheduled-delivery", nil}
+	errHTTPBadRequestPriorityInvalid                 = &errHTTP{40007, http.StatusBadRequest, "invalid priority parameter", "https://ntfy.sh/docs/publish/#message-priority", nil}
+	errHTTPBadRequestSinceInvalid                    = &errHTTP{40008, http.StatusBadRequest, "invalid since parameter", "https://ntfy.sh/docs/subscribe/api/#fetch-cached-messages", nil}
+	errHTTPBadRequestTopicInvalid                    = &errHTTP{40009, http.StatusBadRequest, "invalid request: topic invalid", "", nil}
+	errHTTPBadRequestTopicDisallowed                 = &errHTTP{40010, http.StatusBadRequest, "invalid request: topic name is not allowed", "", nil}
+	errHTTPBadRequestMessageNotUTF8                  = &errHTTP{40011, http.StatusBadRequest, "invalid message: message must be UTF-8 encoded", "", nil}
+	errHTTPBadRequestAttachmentURLInvalid            = &errHTTP{40013, http.StatusBadRequest, "invalid request: attachment URL is invalid", "https://ntfy.sh/docs/publish/#attachments", nil}
+	errHTTPBadRequestAttachmentsDisallowed           = &errHTTP{40014, http.StatusBadRequest, "invalid request: attachments not allowed", "https://ntfy.sh/docs/config/#attachments", nil}
+	errHTTPBadRequestAttachmentsExpiryBeforeDelivery = &errHTTP{40015, http.StatusBadRequest, "invalid request: attachment expiry before delayed delivery date", "https://ntfy.sh/docs/publish/#scheduled-delivery", nil}
+	errHTTPBadRequestWebSocketsUpgradeHeaderMissing  = &errHTTP{40016, http.StatusBadRequest, "invalid request: client not using the websocket protocol", "https://ntfy.sh/docs/subscribe/api/#websockets", nil}
+	errHTTPBadRequestMessageJSONInvalid              = &errHTTP{40017, http.StatusBadRequest, "invalid request: request body must be message JSON", "https://ntfy.sh/docs/publish/#publish-as-json", nil}
+	errHTTPBadRequestActionsInvalid                  = &errHTTP{40018, http.StatusBadRequest, "invalid request: actions invalid", "https://ntfy.sh/docs/publish/#action-buttons", nil}
+	errHTTPBadRequestMatrixMessageInvalid            = &errHTTP{40019, http.StatusBadRequest, "invalid request: Matrix JSON invalid", "https://ntfy.sh/docs/publish/#matrix-gateway", nil}
+	errHTTPBadRequestIconURLInvalid                  = &errHTTP{40021, http.StatusBadRequest, "invalid request: icon URL is invalid", "https://ntfy.sh/docs/publish/#icons", nil}
+	errHTTPBadRequestSignupNotEnabled                = &errHTTP{40022, http.StatusBadRequest, "invalid request: signup not enabled", "https://ntfy.sh/docs/config", nil}
+	errHTTPBadRequestNoTokenProvided                 = &errHTTP{40023, http.StatusBadRequest, "invalid request: no token provided", "", nil}
+	errHTTPBadRequestJSONInvalid                     = &errHTTP{40024, http.StatusBadRequest, "invalid request: request body must be valid JSON", "", nil}
+	errHTTPBadRequestPermissionInvalid               = &errHTTP{40025, http.StatusBadRequest, "invalid request: incorrect permission string", "", nil}
+	errHTTPBadRequestIncorrectPasswordConfirmation   = &errHTTP{40026, http.StatusBadRequest, "invalid request: password confirmation is not correct", "", nil}
+	errHTTPBadRequestNotAPaidUser                    = &errHTTP{40027, http.StatusBadRequest, "invalid request: not a paid user", "", nil}
+	errHTTPBadRequestBillingRequestInvalid           = &errHTTP{40028, http.StatusBadRequest, "invalid request: not a valid billing request", "", nil}
+	errHTTPBadRequestBillingSubscriptionExists       = &errHTTP{40029, http.StatusBadRequest, "invalid request: billing subscription already exists", "", nil}
+	errHTTPNotFound                                  = &errHTTP{40401, http.StatusNotFound, "page not found", "", nil}
+	errHTTPUnauthorized                              = &errHTTP{40101, http.StatusUnauthorized, "unauthorized", "https://ntfy.sh/docs/publish/#authentication", nil}
+	errHTTPForbidden                                 = &errHTTP{40301, http.StatusForbidden, "forbidden", "https://ntfy.sh/docs/publish/#authentication", nil}
+	errHTTPConflictUserExists                        = &errHTTP{40901, http.StatusConflict, "conflict: user already exists", "", nil}
+	errHTTPConflictTopicReserved                     = &errHTTP{40902, http.StatusConflict, "conflict: access control entry for topic or topic pattern already exists", "", nil}
+	errHTTPConflictSubscriptionExists                = &errHTTP{40903, http.StatusConflict, "conflict: topic subscription already exists", "", nil}
+	errHTTPEntityTooLargeAttachment                  = &errHTTP{41301, http.StatusRequestEntityTooLarge, "attachment too large, or bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPEntityTooLargeMatrixRequest               = &errHTTP{41302, http.StatusRequestEntityTooLarge, "Matrix request is larger than the max allowed length", "", nil}
+	errHTTPEntityTooLargeJSONBody                    = &errHTTP{41303, http.StatusRequestEntityTooLarge, "JSON body too large", "", nil}
+	errHTTPTooManyRequestsLimitRequests              = &errHTTP{42901, http.StatusTooManyRequests, "limit reached: too many requests, please be nice", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitEmails                = &errHTTP{42902, http.StatusTooManyRequests, "limit reached: too many emails, please be nice", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitSubscriptions         = &errHTTP{42903, http.StatusTooManyRequests, "limit reached: too many active subscriptions, please be nice", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitTotalTopics           = &errHTTP{42904, http.StatusTooManyRequests, "limit reached: the total number of topics on the server has been reached, please contact the admin", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitAttachmentBandwidth   = &errHTTP{42905, http.StatusTooManyRequests, "limit reached: daily bandwidth reached", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitAccountCreation       = &errHTTP{42906, http.StatusTooManyRequests, "limit reached: too many accounts created", "https://ntfy.sh/docs/publish/#limitations", nil} // FIXME document limit
+	errHTTPTooManyRequestsLimitReservations          = &errHTTP{42907, http.StatusTooManyRequests, "limit reached: too many topic reservations for this user", "", nil}
+	errHTTPTooManyRequestsLimitMessages              = &errHTTP{42908, http.StatusTooManyRequests, "limit reached: daily message quota reached", "https://ntfy.sh/docs/publish/#limitations", nil}
+	errHTTPTooManyRequestsLimitAuthFailure           = &errHTTP{42909, http.StatusTooManyRequests, "limit reached: too many auth failures", "https://ntfy.sh/docs/publish/#limitations", nil} // FIXME document limit
+	errHTTPInternalError                             = &errHTTP{50001, http.StatusInternalServerError, "internal server error", "", nil}
+	errHTTPInternalErrorInvalidPath                  = &errHTTP{50002, http.StatusInternalServerError, "internal server error: invalid path", "", nil}
+	errHTTPInternalErrorMissingBaseURL               = &errHTTP{50003, http.StatusInternalServerError, "internal server error: base-url must be be configured for this feature", "https://ntfy.sh/docs/config/", nil}
+	errHTTPInsufficientStorage                       = &errHTTP{50701, http.StatusInsufficientStorage, "internal server error: cannot publish to UnifiedPush topic without previously active subscriber", "", nil}
 )
diff --git a/server/server.go b/server/server.go
index 50a4723a..ba1ca30c 100644
--- a/server/server.go
+++ b/server/server.go
@@ -582,11 +582,11 @@ func (s *Server) handlePublishWithoutResponse(r *http.Request, v *visitor) (*mes
 		// Rate-Topics header). The 5xx response is because some app servers (in particular Mastodon) will remove
 		// the subscription as invalid if any 400-499 code (except 429/408) is returned.
 		// See https://github.com/mastodon/mastodon/blob/730bb3e211a84a2f30e3e2bbeae3f77149824a68/app/workers/web/push_notification_worker.rb#L35-L46
-		return nil, errHTTPInsufficientStorage
+		return nil, errHTTPInsufficientStorage.With(t)
 	} else if !util.ContainsIP(s.config.VisitorRequestExemptIPAddrs, v.ip) && !vrate.MessageAllowed() {
-		return nil, errHTTPTooManyRequestsLimitMessages
+		return nil, errHTTPTooManyRequestsLimitMessages.With(t)
 	} else if email != "" && !vrate.EmailAllowed() {
-		return nil, errHTTPTooManyRequestsLimitEmails
+		return nil, errHTTPTooManyRequestsLimitEmails.With(t)
 	}
 	if m.PollID != "" {
 		m = newPollRequestMessage(t.ID, m.PollID)
@@ -605,6 +605,7 @@ func (s *Server) handlePublishWithoutResponse(r *http.Request, v *visitor) (*mes
 	delayed := m.Time > time.Now().Unix()
 	ev := logvrm(v, r, m).
 		Tag(tagPublish).
+		With(t).
 		Fields(log.Context{
 			"message_delayed":      delayed,
 			"message_firebase":     firebase,
@@ -781,7 +782,7 @@ func (s *Server) parsePublishParams(r *http.Request, m *message) (cache bool, fi
 	if actionsStr != "" {
 		m.Actions, err = parseActions(actionsStr)
 		if err != nil {
-			return false, false, "", false, wrapErrHTTP(errHTTPBadRequestActionsInvalid, err.Error())
+			return false, false, "", false, errHTTPBadRequestActionsInvalid.Wrap(err.Error())
 		}
 	}
 	unifiedpush = readBoolParam(r, false, "x-unifiedpush", "unifiedpush", "up") // see GET too!
@@ -845,7 +846,7 @@ func (s *Server) handleBodyAsMessageAutoDetect(m *message, body *util.PeekedRead
 
 func (s *Server) handleBodyAsTextMessage(m *message, body *util.PeekedReadCloser) error {
 	if !utf8.Valid(body.PeekedBytes) {
-		return errHTTPBadRequestMessageNotUTF8
+		return errHTTPBadRequestMessageNotUTF8.With(m)
 	}
 	if len(body.PeekedBytes) > 0 { // Empty body should not override message (publish via GET!)
 		m.Message = strings.TrimSpace(string(body.PeekedBytes)) // Truncates the message to the peek limit if required
@@ -858,7 +859,7 @@ func (s *Server) handleBodyAsTextMessage(m *message, body *util.PeekedReadCloser
 
 func (s *Server) handleBodyAsAttachment(r *http.Request, v *visitor, m *message, body *util.PeekedReadCloser) error {
 	if s.fileCache == nil || s.config.BaseURL == "" || s.config.AttachmentCacheDir == "" {
-		return errHTTPBadRequestAttachmentsDisallowed
+		return errHTTPBadRequestAttachmentsDisallowed.With(m)
 	}
 	vinfo, err := v.Info()
 	if err != nil {
@@ -895,7 +896,7 @@ func (s *Server) handleBodyAsAttachment(r *http.Request, v *visitor, m *message,
 	}
 	m.Attachment.Size, err = s.fileCache.Write(m.ID, body, limiters...)
 	if err == util.ErrLimitReached {
-		return errHTTPEntityTooLargeAttachment
+		return errHTTPEntityTooLargeAttachment.With(m)
 	} else if err != nil {
 		return err
 	}
@@ -1212,7 +1213,7 @@ func (s *Server) setRateVisitors(r *http.Request, v *visitor, rateTopics []*topi
 	for _, t := range rateTopics {
 		logvr(v, r).
 			Tag(tagSubscribe).
-			Field("message_topic", t.ID).
+			With(t).
 			Debug("Setting visitor as rate visitor for topic %s", t.ID)
 		t.SetRateVisitor(v)
 	}
@@ -1558,8 +1559,8 @@ func (s *Server) autorizeTopic(next handleFunc, perm user.Permission) handleFunc
 		u := v.User()
 		for _, t := range topics {
 			if err := s.userManager.Authorize(u, t.ID, perm); err != nil {
-				logvr(v, r).Err(err).Field("message_topic", t.ID).Debug("Access to topic %s not authorized", t.ID)
-				return errHTTPForbidden
+				logvr(v, r).With(t).Err(err).Debug("Access to topic %s not authorized", t.ID)
+				return errHTTPForbidden.With(t)
 			}
 		}
 		return next(w, r, v)
diff --git a/server/server_account_test.go b/server/server_account_test.go
index 0290303a..b78ae544 100644
--- a/server/server_account_test.go
+++ b/server/server_account_test.go
@@ -290,6 +290,7 @@ func TestAccount_ChangePassword_NoAccount(t *testing.T) {
 }
 
 func TestAccount_ExtendToken(t *testing.T) {
+	t.Parallel()
 	s := newTestServer(t, newTestConfigWithAuthFile(t))
 	defer s.closeDatabases()
 
@@ -611,6 +612,7 @@ func TestAccount_Reservation_PublishByAnonymousFails(t *testing.T) {
 }
 
 func TestAccount_Reservation_Delete_Messages_And_Attachments(t *testing.T) {
+	t.Parallel()
 	conf := newTestConfigWithAuthFile(t)
 	conf.AuthDefault = user.PermissionReadWrite
 	s := newTestServer(t, conf)
@@ -685,6 +687,7 @@ func TestAccount_Reservation_Delete_Messages_And_Attachments(t *testing.T) {
 }
 
 func TestAccount_Reservation_Add_Kills_Other_Subscribers(t *testing.T) {
+	t.Parallel()
 	conf := newTestConfigWithAuthFile(t)
 	conf.AuthDefault = user.PermissionReadWrite
 	conf.EnableSignup = true
@@ -766,6 +769,7 @@ func TestAccount_Reservation_Add_Kills_Other_Subscribers(t *testing.T) {
 }
 
 func TestAccount_Persist_UserStats_After_Tier_Change(t *testing.T) {
+	t.Parallel()
 	conf := newTestConfigWithAuthFile(t)
 	conf.AuthDefault = user.PermissionReadWrite
 	conf.AuthStatsQueueWriterInterval = 200 * time.Millisecond
diff --git a/server/server_manager.go b/server/server_manager.go
index 82367884..42bdfb39 100644
--- a/server/server_manager.go
+++ b/server/server_manager.go
@@ -44,16 +44,11 @@ func (s *Server) execManager() {
 							"rate_visitor_user_id": vrate.MaybeUserID(),
 						})
 					}
-					ev.
-						Fields(log.Context{
-							"message_topic":             t.ID,
-							"message_topic_subscribers": subs,
-						}).
-						Trace("- topic %s: %d subscribers", t.ID, subs)
+					ev.With(t).Trace("- topic %s: %d subscribers", t.ID, subs)
 				}
 				msgs, exists := messageCounts[t.ID]
 				if t.Stale() && (!exists || msgs == 0) {
-					log.Tag(tagManager).Field("message_topic", t.ID).Trace("Deleting empty topic %s", t.ID)
+					log.Tag(tagManager).With(t).Trace("Deleting empty topic %s", t.ID)
 					emptyTopics++
 					delete(s.topics, t.ID)
 					continue
diff --git a/server/server_payments.go b/server/server_payments.go
index 583a253f..cb585966 100644
--- a/server/server_payments.go
+++ b/server/server_payments.go
@@ -188,13 +188,13 @@ func (s *Server) handleAccountBillingSubscriptionCreateSuccess(w http.ResponseWr
 	if err != nil {
 		return err
 	} else if sess.Customer == nil || sess.Subscription == nil || sess.ClientReferenceID == "" {
-		return wrapErrHTTP(errHTTPBadRequestBillingRequestInvalid, "customer or subscription not found")
+		return errHTTPBadRequestBillingRequestInvalid.Wrap("customer or subscription not found")
 	}
 	sub, err := s.stripe.GetSubscription(sess.Subscription.ID)
 	if err != nil {
 		return err
 	} else if sub.Items == nil || len(sub.Items.Data) != 1 || sub.Items.Data[0].Price == nil || sub.Items.Data[0].Price.Recurring == nil {
-		return wrapErrHTTP(errHTTPBadRequestBillingRequestInvalid, "more than one line item in existing subscription")
+		return errHTTPBadRequestBillingRequestInvalid.Wrap("more than one line item in existing subscription")
 	}
 	priceID, interval := sub.Items.Data[0].Price.ID, sub.Items.Data[0].Price.Recurring.Interval
 	tier, err := s.userManager.TierByStripePrice(priceID)
@@ -273,7 +273,7 @@ func (s *Server) handleAccountBillingSubscriptionUpdate(w http.ResponseWriter, r
 	if err != nil {
 		return err
 	} else if sub.Items == nil || len(sub.Items.Data) != 1 {
-		return wrapErrHTTP(errHTTPBadRequestBillingRequestInvalid, "no items, or more than one item")
+		return errHTTPBadRequestBillingRequestInvalid.Wrap("no items, or more than one item")
 	}
 	params := &stripe.SubscriptionParams{
 		CancelAtPeriodEnd: stripe.Bool(false),
diff --git a/server/server_payments_test.go b/server/server_payments_test.go
index e11af953..ebd559e7 100644
--- a/server/server_payments_test.go
+++ b/server/server_payments_test.go
@@ -415,6 +415,8 @@ func TestPayments_Checkout_Success_And_Increase_Rate_Limits_Reset_Visitor(t *tes
 }
 
 func TestPayments_Webhook_Subscription_Updated_Downgrade_From_PastDue_To_Active(t *testing.T) {
+	t.Parallel()
+
 	// This tests incoming webhooks from Stripe to update a subscription:
 	// - All Stripe columns are updated in the user table
 	// - When downgrading, excess reservations are deleted, including messages and attachments in
diff --git a/server/server_test.go b/server/server_test.go
index b19052e6..381a5535 100644
--- a/server/server_test.go
+++ b/server/server_test.go
@@ -84,6 +84,7 @@ func TestServer_PublishWithFirebase(t *testing.T) {
 }
 
 func TestServer_SubscribeOpenAndKeepalive(t *testing.T) {
+	t.Parallel()
 	c := newTestConfig(t)
 	c.KeepaliveInterval = time.Second
 	s := newTestServer(t, c)
@@ -122,6 +123,7 @@ func TestServer_SubscribeOpenAndKeepalive(t *testing.T) {
 }
 
 func TestServer_PublishAndSubscribe(t *testing.T) {
+	t.Parallel()
 	s := newTestServer(t, newTestConfig(t))
 
 	subscribeRR := httptest.NewRecorder()
@@ -297,6 +299,7 @@ func TestServer_PublishNoCache(t *testing.T) {
 }
 
 func TestServer_PublishAt(t *testing.T) {
+	t.Parallel()
 	c := newTestConfig(t)
 	c.MinDelay = time.Second
 	c.DelayedSenderInterval = 100 * time.Millisecond
@@ -452,6 +455,7 @@ func TestServer_PublishWithNopCache(t *testing.T) {
 }
 
 func TestServer_PublishAndPollSince(t *testing.T) {
+	t.Parallel()
 	s := newTestServer(t, newTestConfig(t))
 
 	request(t, s, "PUT", "/mytopic", "test 1", nil)
@@ -632,6 +636,7 @@ func TestServer_PollWithQueryFilters(t *testing.T) {
 }
 
 func TestServer_SubscribeWithQueryFilters(t *testing.T) {
+	t.Parallel()
 	c := newTestConfig(t)
 	c.KeepaliveInterval = 800 * time.Millisecond
 	s := newTestServer(t, c)
@@ -816,6 +821,7 @@ func TestServer_Auth_NonBasicHeader(t *testing.T) {
 }
 
 func TestServer_StatsResetter(t *testing.T) {
+	t.Parallel()
 	// This tests the stats resetter for
 	// - an anonymous user
 	// - a user without a tier (treated like the same as the anonymous user)
@@ -956,6 +962,8 @@ func TestServer_StatsResetter_MessageLimiter_EmailsLimiter(t *testing.T) {
 }
 
 func TestServer_DailyMessageQuotaFromDatabase(t *testing.T) {
+	t.Parallel()
+
 	// This tests that the daily message quota is prefilled originally from the database,
 	// if the visitor is unknown
 
@@ -1050,6 +1058,7 @@ func TestServer_PublishTooRequests_Defaults_ExemptHosts_MessageDailyLimit(t *tes
 }
 
 func TestServer_PublishTooRequests_ShortReplenish(t *testing.T) {
+	t.Parallel()
 	c := newTestConfig(t)
 	c.VisitorRequestLimitBurst = 60
 	c.VisitorRequestLimitReplenish = time.Second
@@ -1082,6 +1091,7 @@ func TestServer_PublishTooManyEmails_Defaults(t *testing.T) {
 }
 
 func TestServer_PublishTooManyEmails_Replenish(t *testing.T) {
+	t.Parallel()
 	c := newTestConfig(t)
 	c.VisitorEmailLimitReplenish = 500 * time.Millisecond
 	s := newTestServer(t, c)
@@ -1349,6 +1359,7 @@ func TestServer_PublishAsJSON_RateLimit_MessageDailyLimit(t *testing.T) {
 }
 
 func TestServer_PublishAsJSON_WithEmail(t *testing.T) {
+	t.Parallel()
 	mailer := &testMailer{}
 	s := newTestServer(t, newTestConfig(t))
 	s.smtpSender = mailer
@@ -1604,6 +1615,7 @@ func TestServer_PublishAttachmentTooLargeBodyVisitorAttachmentTotalSizeLimit(t *
 }
 
 func TestServer_PublishAttachmentAndExpire(t *testing.T) {
+	t.Parallel()
 	content := util.RandomString(5000) // > 4096
 
 	c := newTestConfig(t)
@@ -1631,6 +1643,7 @@ func TestServer_PublishAttachmentAndExpire(t *testing.T) {
 }
 
 func TestServer_PublishAttachmentWithTierBasedExpiry(t *testing.T) {
+	t.Parallel()
 	content := util.RandomString(5000) // > 4096
 
 	c := newTestConfigWithAuthFile(t)
@@ -1898,6 +1911,7 @@ func TestServer_Visitor_XForwardedFor_Multiple(t *testing.T) {
 }
 
 func TestServer_PublishWhileUpdatingStatsWithLotsOfMessages(t *testing.T) {
+	t.Parallel()
 	count := 50000
 	c := newTestConfig(t)
 	c.TotalTopicLimit = 50001
diff --git a/server/topic.go b/server/topic.go
index e6d4687e..bb939b66 100644
--- a/server/topic.go
+++ b/server/topic.go
@@ -115,9 +115,9 @@ func (t *topic) CancelSubscribers(exceptUserID string) {
 		if s.userID != exceptUserID {
 			log.
 				Tag(tagSubscribe).
+				With(t).
 				Fields(log.Context{
-					"message_topic": t.ID,
-					"user_id":       s.userID,
+					"user_id": s.userID,
 				}).
 				Debug("Canceling subscriber %s", s.userID)
 			s.cancel()
@@ -125,6 +125,20 @@ func (t *topic) CancelSubscribers(exceptUserID string) {
 	}
 }
 
+func (t *topic) Context() log.Context {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	fields := map[string]any{
+		"topic":             t.ID,
+		"topic_subscribers": len(t.subscribers),
+	}
+	if t.rateVisitor != nil {
+		fields["topic_rate_visitor_ip"] = t.rateVisitor.IP().String()
+		fields["topic_rate_visitor_user_id"] = t.rateVisitor.MaybeUserID()
+	}
+	return fields
+}
+
 // subscribersCopy returns a shallow copy of the subscribers map
 func (t *topic) subscribersCopy() map[int]*topicSubscriber {
 	t.mu.Lock()
diff --git a/server/types.go b/server/types.go
index ead753dd..cd91ecce 100644
--- a/server/types.go
+++ b/server/types.go
@@ -45,10 +45,10 @@ type message struct {
 
 func (m *message) Context() log.Context {
 	fields := map[string]any{
+		"topic":             m.Topic,
 		"message_id":        m.ID,
 		"message_time":      m.Time,
 		"message_event":     m.Event,
-		"message_topic":     m.Topic,
 		"message_body_size": len(m.Message),
 	}
 	if m.Sender.IsValid() {