objectstack-ai
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diff --git a/‎docs/adr/0103-managedby-write-policy-and-engine-write-guard.md‎
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@@ -0,0 +1,59 @@
+---
+"@objectstack/spec": minor
+"@objectstack/platform-objects": minor
+"@objectstack/plugin-security": minor
+"@objectstack/plugin-approvals": minor
+"@objectstack/plugin-hono-server": minor
+"@objectstack/service-messaging": minor
+---
+
+feat(spec)!: retire the overloaded `managedBy: 'system'` bucket — the residue becomes `system-data` (#3355)
+
+**FROM → TO: `managedBy: 'system'` → `managedBy: 'system-data'`.** One-line fix:
+rename the value. Nothing else about the object changes. `os migrate meta --from 16`
+rewrites it for you; stored metadata is CONVERTED by the ADR-0087 entry
+`object-managed-by-system-to-system-data`, never silently reinterpreted.
+
+ADR-0103 split the overloaded `system` bucket in v16, and it split it
+**additively**: the 20 engine-owned objects moved to the new explicit
+`engine-owned`, while the 8 admin/user-writable ones — the RBAC link tables
+(`sys_user_position`, `sys_user_permission_set`, `sys_position_permission_set`),
+`sys_user_preference`, `sys_approval_delegation`, and the three messaging config
+grids — stayed behind on `system`. That was the right move for a v16 that could
+not break authors, but it left the enum in a state where the surviving value
+names the half that had already moved out: `system` sitting on precisely the
+objects a user writes.
+
+That is not a cosmetic complaint. An author choosing between `system` and
+`engine-owned` had nothing in the vocabulary to choose *on*, so the bucket was
+re-overloadable by anyone reading the name in good faith — a model author most
+of all, since "system table" reads as "the engine owns this" in every other
+codebase. `system-data` states both boundaries explicitly: the **schema** is the
+platform's (versus `platform`, which is tenant-modelled), the **data** is the
+admin's or the user's (versus `engine-owned`, where the engine owns both).
+
+Because v16 already drained the engine side, the conversion is a **one-to-one
+mechanical value rename** with no judgement call — by construction every
+remaining `system` declaration is writable platform data.
+
+**One deliberate consequence — the affordance default flips.** `system` defaulted
+LOCKED and each of the 8 objects re-opened its writes with a
+`userActions: { create: true, edit: true, delete: true }` block. `system-data`
+defaults **WRITABLE** (full CRUD), because a bucket that exists to say "the data
+is yours" should not make every member ask for it back. Those blocks are now
+redundant and have been deleted from the 8 platform objects; keep `userActions`
+only to **NARROW**. If you converted an object that carried no `userActions`, it
+gains the generic affordances — the honest reading of the bucket it moved into.
+
+**No enforcement moves.** The engine write guard, the `DelegatedAdminGate`, RLS
+and permission sets all adjudicate off resolved affordances and the principal,
+never off the bucket name. `system-data` simply joins `platform` / `config` as a
+bucket the fail-closed guard does not cover, because a writable default has
+nothing to close on. The 8 objects passed that guard before (via `userActions`)
+and pass it now (via the bucket default), for the same resolved-affordance
+reason.
+
+`'system'` is **retired from the load path**: the enum rejects it with a
+prescription naming `system-data` and the one-line fix. Absorbing it silently at
+load would leave every author still writing the name this rename exists to
+unteach.
@@ -215,8 +215,8 @@ indexes: [
 | Property | Type | Description |
 | :--- | :--- | :--- |
 | `isSystem` | `boolean` | System object, protected from deletion (default: `false`) |
-| `managedBy` | `enum` | Lifecycle bucket that sets the default CRUD affordances and write policy — `'platform'` (default), `'config'`, `'system'`, `'engine-owned'`, `'append-only'`, `'better-auth'`. See [Lifecycle bucket](#lifecycle-bucket-managedby) below. |
-| `userActions` | `object` | Per-object override of the CRUD affordances the `managedBy` default implies — `{ create?, edit?, delete?, import?, exportCsv? }`. This is what makes a `system`/`append-only` object admin/user-writable. See [Lifecycle bucket](#lifecycle-bucket-managedby). |
+| `managedBy` | `enum` | Lifecycle bucket that sets the default CRUD affordances and write policy — `'platform'` (default), `'config'`, `'system-data'`, `'engine-owned'`, `'append-only'`, `'better-auth'`. See [Lifecycle bucket](#lifecycle-bucket-managedby) below. |
+| `userActions` | `object` | Per-object override of the CRUD affordances the `managedBy` default implies — `{ create?, edit?, delete?, import?, exportCsv? }`. This is what NARROWS a `system-data` object, or opens a verb on an `engine-owned`/`append-only` one. See [Lifecycle bucket](#lifecycle-bucket-managedby). |
 | `sharingModel` | `enum` | Org-Wide Default record visibility (ADR-0055/0056/0090). Canonical four only: `'private'`, `'public_read'`, `'public_read_write'`, `'controlled_by_parent'` (detail visibility derived from its master). The legacy aliases (`'read'`, `'read_write'`, `'full'`) were removed from the enum (ADR-0090 D4) — authoring rejects them. Unset on a custom object resolves to `'private'` (ADR-0090 D1) |
 | `ownership` | `enum` | Record-ownership model: `'user'` (default — injects the reassignable `owner_id` lookup, engaging owner-scoped RLS, "My" views and owner reports), `'org'`, or `'none'` (no per-record owner — Dataverse-style catalog / junction tables, skips `owner_id`). Distinct from the package `own`/`extend` contribution kind. |
 | `validations` | `ValidationRule[]` | Object-level validation rules (see [Validation](/docs/data-modeling/validation)) |
@@ -233,44 +233,58 @@ bare bucket string.
 | :--- | :--- |
 | `platform` | **Default.** User-owned business data — full New / Import / Edit / Delete. |
 | `config` | Admin-authored configuration — New / Edit / Delete, no CSV import. |
-| `system` | Platform-defined schema holding **admin/user-writable data** (RBAC link tables, preferences, messaging config). Locked by default; each object opens its writes via `userActions`. |
+| `system-data` | Platform-defined schema holding **admin/user-writable data** (RBAC link tables, preferences, messaging config). Full CRUD by default; narrow it with `userActions`. |
 | `engine-owned` | Runtime rows a platform service owns end to end — generic CRUD hidden, exposed `['get', 'list']` only, **no user writes ever**. |
 | `append-only` | Immutable audit trail — View + Export only. |
 | `better-auth` | Identity tables owned by the better-auth driver — generic user-context CRUD is suppressed; mutations flow through the auth API (sign-in, invite, reset). |
 
-**`engine-owned` vs. writable `system` objects (ADR-0103).** Two buckets share
-the same locked default matrix but say different things:
+**`engine-owned` vs. `system-data` (ADR-0103, #3355).** Both hold a
+platform-defined schema no tenant may model; they differ on who owns the *rows*:
 
 - **`engine-owned`** — jobs, notifications, approval runtime rows,
   `sys_record_share`, `sys_automation_run`, the metadata store, `sys_secret`,
   audit trails — written only by their owning service under a system context,
-  never through the generic `/data` API. A fail-closed guard
-  (`assertEngineOwnedWriteAllowed`) rejects user-context generic writes to them.
-- **`system`** — platform-defined schema holding admin/user-writable *data*: the
-  RBAC link tables, `sys_user_preference`, `sys_approval_delegation`, the
-  messaging config grids. These declare `userActions` to open the writes they
-  legitimately take:
+  never through the generic `/data` API. Locked by default, and a fail-closed
+  guard (`assertEngineOwnedWriteAllowed`) rejects user-context generic writes.
+- **`system-data`** — the schema is the platform's, the *data* is the admin's or
+  the user's: the RBAC link tables, `sys_user_preference`,
+  `sys_approval_delegation`, the messaging config grids. Full CRUD by default,
+  and no write guard covers the bucket — a writable default has nothing to fail
+  closed on:
 
 ```typescript
 export const SysUserPreference = ObjectSchema.create({
   name: 'sys_user_preference',
-  managedBy: 'system',
-  // Affordance only — RLS / delegated administration is the actual authz.
-  userActions: { create: true, edit: true, delete: true },
+  // Full CRUD by default — no `userActions` needed. RLS / delegated
+  // administration is the actual authz.
+  managedBy: 'system-data',
   // …
 });
 ```
 
-The same override works on `append-only`. `userActions` is an *affordance*
-declaration; the real authorization for these rows is still enforced by RLS,
-delegated administration, and permission sets.
+Pick between them on the *data*, not the table name: if no user ever writes a
+row through the generic API, it is `engine-owned`. Declaring `system-data` on an
+object whose resolved affordances grant no create, edit or delete is a
+contradiction, and `ObjectSchema.create()` refuses it.
+
+`userActions` NARROWS `system-data` (an editable-only grid: `{ create: false,
+delete: false }`) and OPENS a verb on `append-only`. Either way it is an
+*affordance* declaration; the real authorization for these rows is still
+enforced by RLS, delegated administration, and permission sets.
+
+<Callout type="info">
+**Upgrading from v16.** `managedBy: 'system'` was retired in protocol 17 —
+rename it to `'system-data'`, or run `os migrate meta --from 16`. Because the
+new bucket defaults to full CRUD, a `userActions` block that existed only to
+re-open create/edit/delete is now redundant and can be deleted.
+</Callout>
 
 <Callout type="warn">
 A managed object may not advertise `enable.apiMethods` verbs its resolved
 affordances forbid — the registry strips the contradiction at registration
-(`reconcileManagedApiMethods`, ADR-0049). To expose a generic write verb on a
-`system`/`append-only` object, declare the matching `userActions` rather than
-listing the verb in `apiMethods`.
+(`reconcileManagedApiMethods`, ADR-0049). To expose a generic write verb on an
+`engine-owned`/`append-only` object, declare the matching `userActions` rather
+than listing the verb in `apiMethods`.
 </Callout>
 
 ## Naming Conventions
 
@@ -115,7 +115,7 @@ const result = ApiMethod.parse(data);
 | **description** | `string` | optional | Developer documentation / description |
 | **icon** | `string` | optional | Icon name (Lucide/Material) for UI representation |
 | **isSystem** | `boolean` | optional | Is system object (protected from deletion; defaults its org-wide sharing to public when no sharingModel is set — plugin-sharing) |
-| **managedBy** | `Enum<'platform' \| 'config' \| 'system' \| 'engine-owned' \| 'append-only' \| 'better-auth'>` | optional | Lifecycle bucket — platform (user CRUD) \| config (admin authored) \| system (engine-managed schema, writable via userActions) \| engine-owned (engine owns the lifecycle, no user writes) \| append-only (audit) \| better-auth (identity). UI clients honour the resolved affordance matrix. |
+| **managedBy** | `Enum<'platform' \| 'config' \| 'system-data' \| 'engine-owned' \| 'append-only' \| 'better-auth'>` | optional | Lifecycle bucket — platform (user CRUD) \| config (admin authored) \| system-data (platform-defined schema, admin/user-writable data) \| engine-owned (engine owns the lifecycle, no user writes) \| append-only (audit) \| better-auth (identity). UI clients honour the resolved affordance matrix. |
 | **ownership** | `Enum<'user' \| 'org' \| 'none'>` | optional | Record-ownership model: user (default — injects reassignable owner_id) \| org \| none (no per-record owner, skips owner_id). Distinct from the package own/extend contribution kind. |
 | **userActions** | `{ create?: boolean; import?: boolean; edit?: boolean \| { enabled?: boolean; visibleWhen?: string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object }; disabledWhen?: string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object } }; delete?: boolean \| { enabled?: boolean; visibleWhen?: string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object }; disabledWhen?: string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object } }; … }` | optional | Per-object override of the resolved CRUD affordance matrix. |
 | **systemFields** | `'false' \| { tenant?: boolean; audit?: boolean }` | optional | Opt out of, or selectively disable, registry-level system-field auto-injection. |
 
@@ -1,6 +1,7 @@
 # ADR-0103: `managedBy` write policy — split the overloaded `system` bucket, enforce engine-owned writes
 
-- **Status**: Accepted
+- **Status**: Accepted (D5 completed in v17 — see the #3355 addendum at the end:
+  the residual `system` bucket is renamed `system-data` and the bare value retired)
 - **Date**: 2026-07-19
 - **Issue**: #3220 (root cause surfaced by the #1591 / #3213 better-auth guard work; safe slice shipped in #3222)
 - **Relates to**: ADR-0049 (no unenforced security properties), ADR-0092 (identity
@@ -192,3 +193,60 @@ renders an unknown `engine-owned` object editable but the server still 405s the
 write (point 1). Removing the overloaded `system` entirely — moving the 8 writable
 objects to a dedicated writable-platform-data bucket (or `config`) and retiring
 `system` — is a genuinely breaking rename deferred to **v17**.
+
+---
+
+## Addendum (v17, #3355) — the deferred half: `system` → `system-data`
+
+The v16 sequencing note above deferred "removing the overloaded `system` entirely"
+to v17. This addendum records that close-out. It **completes** D5 rather than
+revising it; nothing decided above is reversed.
+
+**What the additive split left behind.** D5 moved the 20 engine-owned objects out
+to the explicit `engine-owned` and had the 8 writable ones *keep* `system`. That
+was correct for a release that could not break authors, but the value that
+remained named the half that had just moved out: "system" sitting on precisely the
+objects a user writes. The practical cost is not aesthetic — an author choosing
+between `system` and `engine-owned` had nothing in the vocabulary to choose *on*,
+so the bucket was re-overloadable by anyone reading the name in good faith, and a
+model author most of all ("system table" reads as engine-owned everywhere else).
+
+**Decision.** The residual bucket is renamed **`system-data`** and the bare
+`system` value is retired from the load path (the enum rejects it with a
+prescription; stored metadata is converted by the ADR-0087 D2 entry
+`object-managed-by-system-to-system-data`). The name states both boundaries the
+old one hid: the **schema** is the platform's — versus `platform`, which is
+tenant-modelled — and the **data** is the admin's or the user's, versus
+`engine-owned`, where the engine owns both.
+
+Rejected alternatives: reusing **`config`** (`sys_user_preference` is user-owned,
+not admin-authored, and `config` suppresses CSV import — a fresh overload on day
+one of the bucket that exists to end one), and **`platform-data`**, which sits one
+word from the semantically unrelated `platform` in the same closed enum and would
+reintroduce the confusion at the moment of choosing.
+
+**One deliberate consequence — the default flips.** `system` defaulted LOCKED with
+each object re-opening its writes via `userActions`; `system-data` defaults
+**WRITABLE** (full CRUD), because a bucket whose purpose is to say "the data is
+yours" should not make every member ask for it back. The 8 objects' re-open blocks
+are therefore deleted, and `userActions` on this bucket now only NARROWS. The
+affordance side-effect is that CSV `import` resolves `true` where it resolved
+`false` under the locked default — an affordance change only; every row a CSV
+import writes is still adjudicated by the `DelegatedAdminGate` / RLS / permission
+sets.
+
+**Enforcement is unchanged, as in D5.** `system-data` joins `platform` / `config`
+as a bucket neither `ENGINE_OWNED_BUCKETS` (guard) nor `GUARDED_WRITE_BUCKETS`
+(clamp) covers — a writable default has nothing to fail closed on. The 8 objects
+passed the guard before via `userActions` and pass now via the bucket default, for
+the same resolved-affordance reason; equivalence pins in `plugin-security`,
+`service-messaging`, `plugin-approvals`, `platform-objects` and
+`plugin-hono-server` assert this per object rather than leaving it to argument.
+
+**New in v17 — the mis-assignment refusal.** Because the default is now writable,
+mislabelling an engine-owned object into this bucket is no longer harmless: it
+advertises generic CRUD on a table that should take no user write, and no guard
+covers the bucket to catch it. `ObjectSchema.create()` therefore **refuses**
+`system-data` on an object whose resolved affordances grant no create, edit or
+delete — a contradiction with no honest reading, computable from the declaration
+alone. Partial narrowing stays legal; only the all-writes-false shape is refused.