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+## Create
+
+A new rollout is created in Experimenter. Since it has not been sent to Preview or sent for review yet, it remains in Draft with no active phase.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    title Draft (Create)
+    Note over Rollout Owner: An owner is ready to create <br/>  a new rollout <br/> and clicks the create button
+    
+    rect rgb(255,204,255) 
+        Rollout Owner->>Experimenter UI: Create rollout
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+    end
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Preview
+
+A draft rollout is sent to Preview. The rollout is published to the Preview collection in Remote Settings, but it is not Live yet and does not have an active phase.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Preview
+    Note over Rollout Owner: An owner is ready to publish <br/> their draft rollout <br/> to Preview
+    
+    rect rgb(255,204,255) 
+        Rollout Owner->>Experimenter UI: Send to Preview
+        Experimenter UI->>Experimenter Backend: Update to Preview <br/> Status: Preview <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds all Preview  <br/> rollouts. Any Preview  <br/> items not in Remote Settings are <br/> created. Any non-Preview items <br/> in RS are deleted.
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Send to Preview
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Create Record <br/> RS status: to-review
+        Experimenter Worker->>Remote Settings Backend: Delete Record <br/> RS status: to-review
+    end 
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (approve/approve)
+
+A draft rollout is sent for review, approved in Experimenter, published to Remote Settings, and then approved in Remote Settings. After both approvals are complete, the rollout becomes Live and starts in Phase 1.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Publish (Approve/Approve)
+    Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Review button
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner launches in Experimenter
+        Rollout Owner->>Experimenter UI: Send to Review
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> approve button
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> to publish, and creates the new published <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Draft <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Create Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Draft <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and approves <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer approves in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Approve
+        Remote Settings UI->>Remote Settings Backend: Approve
+        Remote Settings Backend->>Remote Settings UI: RS status: to-sign
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> rollout approved <br/> in the RS collection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase 1 <br/> Phase Next: None <br/> + changelog
+    end
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (reject/----)
+
+A draft rollout is sent for review but rejected in Experimenter. The rollout stays in Draft and returns to Idle so the owner can make changes and request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Publish (Reject/------)
+    Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Launch button
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner launches in Experimenter
+        Rollout Owner->>Experimenter UI: Send to Review
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> reject button.
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer rejects in Experimenter
+        Reviewer->>Experimenter UI: Reject
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+    end 
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (approve/reject)
+
+A draft rollout is approved in Experimenter and sent to Remote Settings, but the Remote Settings reviewer rejects it. The rollout is rolled back and returns to Draft and Idle so the owner can request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Publish (Approve/Reject)
+    Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Launch button
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner launches in Experimenter
+        Rollout Owner->>Experimenter UI: Send to Review
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> approve button.
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> to publish, and creates the new published <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Draft <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Create Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Draft <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> rollout in <br/> work-in-progress, collects the <br/> rejection message, and rolls back
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: Rollback <br/> RS status: work-in-progress
+        Experimenter Worker->>Experimenter Backend:  Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+    end 
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (approve/reject) + manual rollback
+
+A draft rollout is approved in Experimenter and rejected in Remote Settings, but the Remote Settings rollback is handled manually before Experimenter can recover the rejection reason. The rollout returns to Draft and Idle.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Publish (Approve/Reject + Manual Rollback)
+    Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Launch button
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner launches in Experimenter
+        Rollout Owner->>Experimenter UI: Send to Review
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> approve button.
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> to publish, and creates the new published <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Draft <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Create Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Draft <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+        Remote Settings UI->>Remote Settings Backend: RS status: to-rollback
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> collection in to-sign with no <br/> record of the rejection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout) <br/> RS status: to-sign
+        Experimenter Worker->>Experimenter Backend:  Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+    end 
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (approve/timed out)
+
+A draft rollout is approved in Experimenter and sent to Remote Settings, but the Remote Settings review times out. The rollout returns to Draft and Idle, so the owner must request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Publish (Approve/Timeout)
+    Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Launch button
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner launches in Experimenter
+        Rollout Owner->>Experimenter UI: Send to Review
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> approve button.
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> to publish, and creates the new published <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Draft <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Create Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Draft <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+    end 
+
+    Note over Experimenter Backend: The scheduled background task is <br/> invoked, finds a pending unattended review, <br/> rolls back, and reverts the rollout <br/> back to idle so the owner must request review again
+   
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: RS status: to-rollback
+        Experimenter Worker->>Experimenter Backend:  Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+    end
+%%{init:{'themeCSS':'g:nth-of-type(1) .note { stroke: purple ;fill: white; };'}}%%
+```
+
+## Launch (cancel)
+
+A rollout launch review is canceled in Experimenter before it is approved in Experimenter. The rollout returns to Idle and the owner can request review again later.
+
+```mermaid
+    sequenceDiagram
+        participant Reviewer
+        participant Rollout Owner
+        participant Experimenter UI
+        participant Experimenter Backend
+        participant Experimenter Worker
+        participant Remote Settings UI
+        participant Remote Settings Backend
+        title Cancel from Draft (Cancel ------/------)
+        Note over Rollout Owner: An owner is ready to launch <br/> their draft rollout <br/> from draft and clicks the <br/> Review button
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner launches in Experimenter
+            Rollout Owner->>Experimenter UI: Send to Review
+            Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+        end
+
+        Experimenter Backend-->>Reviewer: To review
+        
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner cancels the review request <br/> in Experimenter
+            Rollout Owner->>Experimenter UI: Cancel the Review
+            Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+        end
+```
+
+A rollout can also be launched from Preview. If that review is canceled before approval, the rollout returns to Draft and Idle.
+
+```mermaid
+    sequenceDiagram
+        participant Reviewer
+        participant Rollout Owner
+        participant Experimenter UI
+        participant Experimenter Backend
+        participant Experimenter Worker
+        participant Remote Settings UI
+        participant Remote Settings Backend
+        title Cancel from Preview (Cancel ------/------)
+        
+        Note over Rollout Owner: An owner is ready to publish <br/> their draft rollout <br/> to Preview
+    
+        rect rgb(255,204,255) 
+            Rollout Owner->>Experimenter UI: Send to Preview
+            Experimenter UI->>Experimenter Backend: Update to Preview <br/> Status: Preview <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None
+        end 
+        
+        Note over Rollout Owner: An owner is ready to launch <br/> their rollout <br/> from preview and clicks the <br/> Launch button
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner launches in Experimenter
+            Rollout Owner->>Experimenter UI: Send to Review
+            Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Review <br/> Status next: Live <br/> Phase: None <br/> Phase Next: Phase 1 <br/> + changelog
+        end
+
+        Experimenter Backend-->>Reviewer: To review
+        
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner cancels the review request <br/> in Experimenter
+            Rollout Owner->>Experimenter UI: Cancel the Review
+            Experimenter UI->>Experimenter Backend: Status: Draft <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: None <br/> Phase Next: None <br/> + changelog
+        end
+```
+
+## Change Phase (Approve/Approve)
+
+A live rollout moves to the next phase while remaining Live. The phase change is approved in Experimenter, approved in Remote Settings, and then the active phase is updated.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Update (Approve/Approve)
+    
+    Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner requests the next phase in Experimenter
+        Rollout Owner->>Experimenter UI: Start Next Phase
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> phase change to publish, and updates the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Update Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and approves <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer approves in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Approve
+        Remote Settings UI->>Remote Settings Backend: Approve
+        Remote Settings Backend->>Remote Settings UI: RS status: to-sign
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the rollout <br/> approved in the RS collection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X + 1 <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Change Phase (Reject/------)
+
+A live rollout phase change is sent for review but rejected in Experimenter. The rollout remains Live in the current phase and returns to Idle.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Update (Reject/------)
+    
+    Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner requests the next phase in Experimenter
+        Rollout Owner->>Experimenter UI: Start Next Phase
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> reject button.
+    
+
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer rejects in Experimenter
+        Reviewer->>Experimenter UI: Reject
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Change Phase (Approve/Reject)
+
+A live rollout phase change is approved in Experimenter but rejected in Remote Settings. The rollout is rolled back and remains Live in the current phase.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Update (Approve/Reject)
+    
+    Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner requests the next phase in Experimenter
+        Rollout Owner->>Experimenter UI: Start Next Phase
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> phase change to publish, and updates the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Update Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> rollout in <br/> work-in-progress, collects the <br/> rejection message, and rolls back
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: Rollback <br/> RS status: work-in-progress
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Change Phase (Approve/Reject) + manual rollback
+
+A live rollout phase change is approved in Experimenter and rejected in Remote Settings, but the Remote Settings rollback is handled manually before Experimenter can recover the rejection reason. The rollout remains Live in the current phase and returns to Idle.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Update (Approve/Reject + Manual Rollback)
+    
+    Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner requests the next phase in Experimenter
+        Rollout Owner->>Experimenter UI: Start Next Phase
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> phase change to publish, and updates the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Update Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+        Remote Settings UI->>Remote Settings Backend: RS status: to-rollback
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> collection in to-sign with no <br/> record of the rejection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout) <br/> RS status: to-sign
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Change Phase (Approve/Timeout)
+
+A live rollout phase change is approved in Experimenter and sent to Remote Settings, but the Remote Settings review times out. The rollout stays Live in the current phase and returns to Idle, so the owner must request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Update (Approve/Timeout)
+    
+    Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner requests the next phase in Experimenter
+        Rollout Owner->>Experimenter UI: Start Next Phase
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> phase change to publish, and updates the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Update Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+    end 
+
+    Note over Experimenter Backend: The scheduled background task is <br/> invoked, finds a pending unattended review, <br/> rolls back, and reverts the rollout <br/> back to idle so the owner must request review again
+   
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: RS status: to-rollback
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Change Phase (Cancel ------/------)
+
+A live rollout phase change review is canceled in Experimenter before it is approved in Experimenter. The rollout remains Live in the current phase and returns to Idle.
+
+```mermaid
+    sequenceDiagram
+        participant Reviewer
+        participant Rollout Owner
+        participant Experimenter UI
+        participant Experimenter Backend
+        participant Experimenter Worker
+        participant Remote Settings UI
+        participant Remote Settings Backend
+        title Update (Cancel ------/------)
+        
+        Note over Rollout Owner: An owner is ready to start <br/> the next phase of their live rollout
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner requests the next phase in Experimenter
+            Rollout Owner->>Experimenter UI: Start Next Phase
+            Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: Phase X + 1 <br/> + changelog
+        end
+
+        Experimenter Backend-->>Reviewer: To review
+        
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner cancels the review request <br/> in Experimenter
+            Rollout Owner->>Experimenter UI: Cancel the Review
+            Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+        end
+```
+
+## Disable (Approve/Approve)
+
+A live rollout is disabled after being approved in Experimenter and approved in Remote Settings. Disabling means the rollout is unpublished from Remote Settings. The rollout moves from Live to Disabled while staying in the same phase.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Disable (Approve/Approve)
+    
+    Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner disables in Experimenter
+        Rollout Owner->>Experimenter UI: Disable
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> disable request and unpublishes the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Disabled
+        Note over Experimenter Worker: Worker unpublishes from <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Unpublish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and approves <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer approves in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Approve
+        Remote Settings UI->>Remote Settings Backend: Approve
+        Remote Settings Backend->>Remote Settings UI: RS status: to-sign
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the rollout <br/> approved in the RS collection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Experimenter Backend:  Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Disable (Reject/------)
+
+A live rollout disable request is rejected in Experimenter. The rollout remains Live and published in Remote Settings, and returns to Idle.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Disable (Reject/------)
+    
+    Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner disables in Experimenter
+        Rollout Owner->>Experimenter UI: Disable
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> reject button.
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer rejects in Experimenter
+        Reviewer->>Experimenter UI: Reject
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Disable (Approve/Reject)
+
+A live rollout disable request is approved in Experimenter but rejected in Remote Settings. The unpublish change is rolled back and the rollout remains Live and published in Remote Settings.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Disable (Approve/Reject)
+    
+    Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner disables in Experimenter
+        Rollout Owner->>Experimenter UI: Disable
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> disable request and unpublishes the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Disabled
+        Note over Experimenter Worker: Worker unpublishes from <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Unpublish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> rollout in <br/> work-in-progress, collects the <br/> rejection message, and rolls back
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: Rollback <br/> RS status: work-in-progress
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Disable (Approve/Reject) + manual rollback
+
+A live rollout disable request is approved in Experimenter and rejected in Remote Settings, but the Remote Settings rollback is handled manually before Experimenter can recover the rejection reason. The unpublish change is rolled back, so the rollout remains Live and published in Remote Settings.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Disable (Approve/Reject + Manual Rollback)
+    
+    Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner disables in Experimenter
+        Rollout Owner->>Experimenter UI: Disable
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> disable request and unpublishes the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Disabled
+        Note over Experimenter Worker: Worker unpublishes from <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Unpublish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+    
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204) 
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+        Remote Settings UI->>Remote Settings Backend: RS status: to-rollback
+    end 
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> collection in to-sign with no <br/> record of the rejection
+
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout) <br/> RS status: to-sign
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+```
+
+## Disable (Approve/Timeout)
+
+A live rollout disable request is approved in Experimenter and sent to Remote Settings as an unpublish change, but the Remote Settings review times out. The rollout stays Live and published in Remote Settings, and returns to Idle so the owner must request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Disable (Approve/Timeout)
+    
+    Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+    
+    rect rgb(255,204,255) 
+        Note right of Rollout Owner: Owner disables in Experimenter
+        Rollout Owner->>Experimenter UI: Disable
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+    
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+    
+    rect rgb(255,255,204) 
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Approved <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+ 
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> disable request and unpublishes the <br/> record with the serialized DTO
+    
+    rect rgb(204,255,255) 
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Live <br/> Publish status: Approved <br/> Status next: Disabled
+        Note over Experimenter Worker: Worker unpublishes from <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Unpublish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Live <br/> Publish status: Waiting <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end 
+
+    Note over Experimenter Backend: The scheduled background task is <br/> invoked, finds a pending unattended review, <br/> rolls back, and reverts the rollout <br/> back to idle so the owner must request review again
+   
+    rect rgb(204,255,255) 
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: RS status: to-rollback
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Disable (Cancel ------/------)
+
+A live rollout disable review is canceled in Experimenter before it is approved in Experimenter. The rollout remains Live and published in Remote Settings, and returns to Idle.
+
+```mermaid
+    sequenceDiagram
+        participant Reviewer
+        participant Rollout Owner
+        participant Experimenter UI
+        participant Experimenter Backend
+        participant Experimenter Worker
+        participant Remote Settings UI
+        participant Remote Settings Backend
+        title Disable (Cancel ------/------)
+        
+        Note over Rollout Owner: An owner is ready to disable <br/> their live rollout
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner disables in Experimenter
+            Rollout Owner->>Experimenter UI: Disable
+            Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Review <br/> Status next: Disabled <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+        end
+
+        Experimenter Backend-->>Reviewer: To review
+        
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner cancels the review request <br/> in Experimenter
+            Rollout Owner->>Experimenter UI: Cancel the Review
+            Experimenter UI->>Experimenter Backend: Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+        end
+```
+
+## Enable (Approve/Approve)
+
+A disabled rollout is enabled after being approved in Experimenter and approved in Remote Settings. Enabling means the rollout is published in Remote Settings. The rollout moves from Disabled back to Live while staying in the same phase.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Enable (Approve/Approve)
+
+    Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+    rect rgb(255,204,255)
+        Note right of Rollout Owner: Owner enables in Experimenter
+        Rollout Owner->>Experimenter UI: Enable
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+
+    rect rgb(255,255,204)
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> enable request and publishes the <br/> record with the serialized DTO
+
+    rect rgb(204,255,255)
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Disabled <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Publish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Disabled <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and approves <br/> the change in the collection.
+
+    rect rgb(255,255,204)
+        Note right of Reviewer: Reviewer approves in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Approve
+        Remote Settings UI->>Remote Settings Backend: Approve
+        Remote Settings Backend->>Remote Settings UI: RS status: to-sign
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the rollout <br/> approved in the RS collection
+
+    rect rgb(204,255,255)
+        Note over Experimenter Worker: Worker updates rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Experimenter Backend:  Status: Live <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Enable (Reject/------)
+
+A disabled rollout enable request is rejected in Experimenter. The rollout remains Disabled and unpublished in Remote Settings, and returns to Idle.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Enable (Reject/------)
+
+    Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+    rect rgb(255,204,255)
+        Note right of Rollout Owner: Owner enables in Experimenter
+        Rollout Owner->>Experimenter UI: Enable
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the <br/> rollout's details on the <br/> summary page and clicks the <br/> reject button.
+
+    rect rgb(255,255,204)
+        Note over Rollout Owner: Reviewer rejects in Experimenter
+        Reviewer->>Experimenter UI: Reject
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Enable (Approve/Reject)
+
+A disabled rollout enable request is approved in Experimenter but rejected in Remote Settings. The publish change is rolled back and the rollout remains Disabled and unpublished in Remote Settings.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Enable (Approve/Reject)
+
+    Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+    rect rgb(255,204,255)
+        Note right of Rollout Owner: Owner enables in Experimenter
+        Rollout Owner->>Experimenter UI: Enable
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+
+    rect rgb(255,255,204)
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> enable request and publishes the <br/> record with the serialized DTO
+
+    rect rgb(204,255,255)
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Disabled <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Publish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Disabled <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204)
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> rollout in <br/> work-in-progress, collects the <br/> rejection message, and rolls back
+
+    rect rgb(204,255,255)
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: Rollback <br/> RS status: work-in-progress
+        Experimenter Worker->>Experimenter Backend:  Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Enable (Approve/Reject) + manual rollback
+
+A disabled rollout enable request is approved in Experimenter and rejected in Remote Settings, but the Remote Settings rollback is handled manually before Experimenter can recover the rejection reason. The publish change is rolled back, so the rollout remains Disabled and unpublished in Remote Settings.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Enable (Approve/Reject + Manual Rollback)
+
+    Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+    rect rgb(255,204,255)
+        Note right of Rollout Owner: Owner enables in Experimenter
+        Rollout Owner->>Experimenter UI: Enable
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+
+    rect rgb(255,255,204)
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> enable request and publishes the <br/> record with the serialized DTO
+
+    rect rgb(204,255,255)
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Disabled <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Publish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Disabled <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review in Remote Settings
+
+    Note over Reviewer: The reviewer opens Remote <br/> Settings and rejects <br/> the change in the collection.
+
+    rect rgb(255,255,204)
+        Note right of Reviewer: Reviewer rejects in <br/>Remote Settings
+        Reviewer->>Remote Settings UI: Reject
+        Remote Settings UI->>Remote Settings Backend: RS status: to-rollback
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked and finds the <br/> collection in to-sign with no <br/> record of the rejection
+
+    rect rgb(204,255,255)
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout) <br/> RS status: to-sign
+        Experimenter Worker->>Experimenter Backend:  Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Enable (Approve/Timeout)
+
+A disabled rollout enable request is approved in Experimenter and sent to Remote Settings as a publish change, but the Remote Settings review times out. The rollout stays Disabled and unpublished in Remote Settings, and returns to Idle so the owner must request review again.
+
+```mermaid
+  sequenceDiagram
+    participant Reviewer
+    participant Rollout Owner
+    participant Experimenter UI
+    participant Experimenter Backend
+    participant Experimenter Worker
+    participant Remote Settings UI
+    participant Remote Settings Backend
+    title Enable (Approve/Timeout)
+
+    Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+    rect rgb(255,204,255)
+        Note right of Rollout Owner: Owner enables in Experimenter
+        Rollout Owner->>Experimenter UI: Enable
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Experimenter Backend-->>Reviewer: To review
+    Note over Reviewer: The reviewer reviews the rollout's <br/> details on the summary page <br/> and clicks the approve button
+
+    rect rgb(255,255,204)
+        Note over Rollout Owner: Reviewer approves in Experimenter
+        Reviewer->>Experimenter UI: Approve
+        Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Approved <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Note over Experimenter Backend: The scheduled background task <br/> is invoked, finds an approved rollout <br/> enable request and publishes the <br/> record with the serialized DTO
+
+    rect rgb(204,255,255)
+        Experimenter Backend->>Experimenter Worker: Find rollouts: <br/> Status: Disabled <br/> Publish status: Approved <br/> Status next: Live
+        Note over Experimenter Worker: Worker publishes to <br/>Remote Settings
+        Experimenter Worker->>Remote Settings Backend: Publish Record <br/> RS status: to-review
+        Experimenter Worker->>Experimenter Backend: Status: Disabled <br/> Publish status: Waiting <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+
+    Note over Experimenter Backend: The scheduled background task is <br/> invoked, finds a pending unattended review, <br/> rolls back, and reverts the rollout <br/> back to idle so the owner must request review again
+
+    rect rgb(204,255,255)
+        Note over Experimenter Worker: Worker updates <br/> rollout
+        Experimenter Worker->>Remote Settings Backend: Check collection (timeout)
+        Experimenter Worker->>Remote Settings Backend: RS status: to-rollback
+        Experimenter Worker->>Experimenter Backend:  Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+    end
+```
+
+## Enable (Cancel ------/------)
+
+A disabled rollout enable review is canceled in Experimenter before it is approved in Experimenter. The rollout remains Disabled and unpublished in Remote Settings, and returns to Idle.
+
+```mermaid
+    sequenceDiagram
+        participant Reviewer
+        participant Rollout Owner
+        participant Experimenter UI
+        participant Experimenter Backend
+        participant Experimenter Worker
+        participant Remote Settings UI
+        participant Remote Settings Backend
+        title Enable (Cancel ------/------)
+
+        Note over Rollout Owner: An owner is ready to enable <br/> their disabled rollout
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner enables in Experimenter
+            Rollout Owner->>Experimenter UI: Enable
+            Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Review <br/> Status next: Live <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+        end
+
+        Experimenter Backend-->>Reviewer: To review
+
+        rect rgb(255,204,255)
+            Note right of Rollout Owner: Owner cancels the review request <br/> in Experimenter
+            Rollout Owner->>Experimenter UI: Cancel the Review
+            Experimenter UI->>Experimenter Backend: Status: Disabled <br/> Publish status: Idle <br/> Status next: <none> <br/> Phase: Phase X <br/> Phase Next: None <br/> + changelog
+        end
+```