@@ -2,13 +2,13 @@
 '@objectstack/service-messaging': patch
 ---
 
-fix(service-messaging): a `sys_notification_template` saved for a channel other than `email` or `sms` is now warned about, because no channel ever sends it
+fix(service-messaging): the `sys_notification_template` copy now says that only the email and SMS channels use a template row, and that the in-app inbox never does
 
 A notification template row is read by exactly two channels: the email channel (when the notification names no email template) and the SMS channel, which also renders the phone OTP and invitation texts. The in-app inbox reads no row on any path. `channel` is free text, so a row saved for `inbox`, `push` or any other value was stored and then rendered nowhere, with nothing to say so.
 
-The object now carries a `channel_renders_template` rule at `severity: 'warning'`. A write naming another channel is still accepted and stored, and it now reports the warning. A single-record create, clone or update answers it in the write answer's `warnings` (`rule`, `severity`, `field: 'channel'`, `code`, `message`), and the server logs it once per write. Bulk updates and imports log it. The message points in-app content to an email template (`email_template`) named in a notify step's `template`. The object's description, its empty state and the `channel` / `subject` help now say which channels use a row and that the inbox never does.
+This entry first added a `channel_renders_template` warning for such a write; in the same release #24983's refusal superseded it, so a write naming another channel is refused rather than warned about, as that entry describes. The object's description, its empty state and the `channel` / `subject` help now say which channels use a row and that the inbox never does.
 
-Clause-②: no — nothing a write could send before is refused now; a save naming another channel gains one advisory in the write answer's existing `warnings`.
+Clause-②: no — this entry now describes copy only (the object's description, its empty state and the field help); the narrowing of what a write may send is #24983's, declared in its own entry.
 
-- **Unchanged.** Every write that was accepted is still accepted, and stored rows are not read, rewritten or flagged by anything but a write that names their channel. `email` and `sms` rows, how every channel renders, and the column and its width are unchanged.
+- **Unchanged.** Nothing this entry describes changes which writes are accepted. `email` and `sms` rows, how every channel renders, and the column and its width are unchanged.
 - **What to do.** For in-app content, write an email template and name it in the notify step's `template`; the inbox and email both render it. A row for another channel was never sent, so delete it if you no longer want it listed.
@@ -0,0 +1,18 @@
+---
+'@objectstack/service-messaging': minor
+---
+
+fix(service-messaging)!: `sys_notification_template` refuses a write that leaves a row naming a channel other than `email` or `sms`, because no channel ever sends such a row
+
+A notification template row is read by exactly two channels: the email channel (when the notification names no email template) and the SMS channel, which also renders the phone OTP and invitation texts. The in-app inbox reads no row on any path. `channel` is free text, so a row for `inbox`, `push` or any other value was stored and then rendered nowhere; the `channel_renders_template` rule only warned about it. That rule now refuses. It is an invariant judged over the stored row overlaid with the write, so it answers rows already stored with another channel as well as new ones: such a row is refused on any edit that leaves its channel out of the set, until an edit moves it to `email` or `sms`, and it is still read, listed and deleted. No stored row is rewritten or deleted by this change.
+
+Clause-②: no (narrowing)
+
+<!-- adr-0087: not-required (no-migration-prescription) No metadata moves: no spec key, authorable spelling or stored shape is added, removed, renamed or re-shaped, and no exported declaration is removed or narrowed, so there is nothing for `objectstack migrate meta` to rewrite. The one definition that changes is a validation rule on `sys_notification_template`, a platform object this package ships and owns, and what narrows is the write accept set of that object's rows, which are admin-authored data rather than metadata: no ADR-0087 conversion reaches a stored data row. The remedy is an operator's edit or delete of the row, never a rewrite of a metadata source, and this change rewrites or deletes no stored row. The other categories are closed on facts: the package publishes (not unpublished); no ADR-0087 id is named or touched (not registered or already-registered); and nothing exported is removed or narrowed (not runtime-interface-only, type-surface-only or runtime-export-retired). -->
+
+**BREAKING** (a platform object's write accept set narrows, stored rows included), shipped as `minor` under the launch-window convention for breaking changes.
+
+- **FROM:** a create, update, import row or bulk-update row that left a `sys_notification_template` row naming a channel other than `email` or `sms` was accepted and stored, with at most a `channel_renders_template` advisory in the write answer's `warnings`. A row already stored with such a channel took every edit.
+- **TO:** that write is refused. The REST data door answers `400` with `code: 'VALIDATION_FAILED'` and one finding on `channel` (`code: 'rule_violation'`); an import commit fails that row with `field: 'channel'` and `code: 'rule_violation'`; a bulk update fails that row with `code: 'VALIDATION_FAILED'` and `httpStatus: 400`, and a predicate update over a set holding such a row writes no row. Every refusal carries the prescription: set the channel to `email` or `sms`, or delete the template; in-app content is an email template (`email_template`) named in a notify step's `template`.
+- **Unchanged:** `email` and `sms` rows and every write to them; reading, listing and deleting any row; how every channel renders, so a row for another channel is still sent by none; and the `channel` column and its width.
+- **The fix for an operator:** a row for another channel was never sent. Delete it, or set its channel to `email` or `sms` if its text belongs there. For in-app content, write an email template and name it in the notify step's `template`; the inbox and email both render it.
@@ -32,6 +32,7 @@
   "devDependencies": {
     "@objectstack/driver-sql": "workspace:*",
     "@objectstack/metadata-core": "workspace:*",
+    "@objectstack/metadata-protocol": "workspace:*",
     "@objectstack/objectql": "workspace:*",
     "@types/node": "^26.6.3",
     "typescript": "^6.0.3",