Only connect the base insertion event to the specified prev_event

Author: MadLittleMods

proposals/2716-batch-send-historical-messages.md

@@ -97,18 +97,17 @@ Next we add "insertion" and "chunk" events so it's more presriptive on how each
  - Consideration: the "insertion"/"chunk" events add a new way for an application service to tie the chunk reconciliation in knots(similar to the DAG knots that can happen).
 
 
-![](https://user-images.githubusercontent.com/558581/126261578-a6f6c3ec-bf5c-4c82-a128-66ba4a9ac079.png)
+![](https://user-images.githubusercontent.com/558581/127040602-e95ac36a-5e64-4176-904d-6abae2c95ae9.png)
 
-
-[Mermaid live editor playground link](https://mermaid-js.github.io/mermaid-live-editor/edit/#eyJjb2RlIjoiZmxvd2NoYXJ0IEJUXG4gICAgc3ViZ3JhcGggbGl2ZVxuICAgICAgICBCIC0tLS0tLS0tLS0tLS0tPiBBXG4gICAgZW5kXG4gICAgXG4gICAgc3ViZ3JhcGggY2h1bmswXG4gICAgICAgIGNodW5rMC1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMC0yKChcIjJcIikpIC0tPiBjaHVuazAtMSgoMSkpIC0tPiBjaHVuazAtMCgoMCkpIC0tPiBjaHVuazAtaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcblxuICAgIHN1YmdyYXBoIGNodW5rMVxuICAgICAgICBjaHVuazEtY2h1bmtbW1wiY2h1bmtcIl1dIC0tPiBjaHVuazEtMigoXCIyXCIpKSAtLT4gY2h1bmsxLTEoKDEpKSAtLT4gY2h1bmsxLTAoKDApKSAtLT4gY2h1bmsxLWluc2VydGlvblsvaW5zZXJ0aW9uXFxdXG4gICAgZW5kXG4gICAgXG4gICAgc3ViZ3JhcGggY2h1bmsyXG4gICAgICAgIGNodW5rMi1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMi0yKChcIjJcIikpIC0tPiBjaHVuazItMSgoMSkpIC0tPiBjaHVuazItMCgoMCkpIC0tPiBjaHVuazItaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcblxuICAgIFxuICAgIGNodW5rMC1pbnNlcnRpb25CYXNlWy9pbnNlcnRpb25cXF0gLS0tLS0tLT4gQVxuICAgIGNodW5rMC1jaHVuayAtLi0-IGNodW5rMC1pbnNlcnRpb25CYXNlXG4gICAgY2h1bmswLWluc2VydGlvbiAtLS0tLS0tPiBBXG4gICAgY2h1bmsxLWluc2VydGlvbiAtLT4gQVxuICAgIGNodW5rMS1jaHVuayAtLi0-IGNodW5rMC1pbnNlcnRpb25cbiAgICBjaHVuazItaW5zZXJ0aW9uIC0tPiBBXG4gICAgY2h1bmsyLWNodW5rIC0uLT4gY2h1bmsxLWluc2VydGlvbiIsIm1lcm1haWQiOiJ7fSIsInVwZGF0ZUVkaXRvciI6ZmFsc2UsImF1dG9TeW5jIjp0cnVlLCJ1cGRhdGVEaWFncmFtIjpmYWxzZX0)
+[Mermaid live editor playground link](https://mermaid-js.github.io/mermaid-live-editor/edit/#eyJjb2RlIjoiZmxvd2NoYXJ0IEJUXG4gICAgc3ViZ3JhcGggbGl2ZVxuICAgICAgICBCIC0tLS0tLS0tLS0tLS0tLS0tPiBBXG4gICAgZW5kXG4gICAgXG4gICAgc3ViZ3JhcGggY2h1bmswXG4gICAgICAgIGNodW5rMC1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMC0yKChcIjJcIikpIC0tPiBjaHVuazAtMSgoMSkpIC0tPiBjaHVuazAtMCgoMCkpIC0tPiBjaHVuazAtaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcblxuICAgIHN1YmdyYXBoIGNodW5rMVxuICAgICAgICBjaHVuazEtY2h1bmtbW1wiY2h1bmtcIl1dIC0tPiBjaHVuazEtMigoXCIyXCIpKSAtLT4gY2h1bmsxLTEoKDEpKSAtLT4gY2h1bmsxLTAoKDApKSAtLT4gY2h1bmsxLWluc2VydGlvblsvaW5zZXJ0aW9uXFxdXG4gICAgZW5kXG4gICAgXG4gICAgc3ViZ3JhcGggY2h1bmsyXG4gICAgICAgIGNodW5rMi1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMi0yKChcIjJcIikpIC0tPiBjaHVuazItMSgoMSkpIC0tPiBjaHVuazItMCgoMCkpIC0tPiBjaHVuazItaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcblxuICAgIFxuICAgIGNodW5rMC1pbnNlcnRpb25CYXNlWy9pbnNlcnRpb25cXF0gLS0tLS0tLS0tLS0tLT4gQVxuICAgIGNodW5rMC1jaHVuayAtLi0-IGNodW5rMC1pbnNlcnRpb25CYXNlWy9pbnNlcnRpb25cXF1cbiAgICBjaHVuazEtY2h1bmsgLS4tPiBjaHVuazAtaW5zZXJ0aW9uXG4gICAgY2h1bmsyLWNodW5rIC0uLT4gY2h1bmsxLWluc2VydGlvblxuIiwibWVybWFpZCI6Int9IiwidXBkYXRlRWRpdG9yIjpmYWxzZSwiYXV0b1N5bmMiOnRydWUsInVwZGF0ZURpYWdyYW0iOmZhbHNlfQ)
 
 <details>
 <summary>mermaid graph syntax</summary>
 
 ```mermaid
 flowchart BT
     subgraph live
-        B --------------> A
+        B -----------------> A
     end
     
     subgraph chunk0
@@ -124,12 +123,9 @@ flowchart BT
     end
 
     
-    chunk0-insertionBase[/insertion\] -------> A
-    chunk0-chunk -.-> chunk0-insertionBase
-    chunk0-insertion -------> A
-    chunk1-insertion --> A
+    chunk0-insertionBase[/insertion\] -------------> A
+    chunk0-chunk -.-> chunk0-insertionBase[/insertion\]
     chunk1-chunk -.-> chunk0-insertion
-    chunk2-insertion --> A
     chunk2-chunk -.-> chunk1-insertion
 ```
 
@@ -139,7 +135,6 @@ flowchart BT
 
 
 
-
 The structure of the insertion event would look like:
 ```js
 {
@@ -216,17 +211,17 @@ The structure of the "marker" event would look like:
 }
 ```
 
-![](https://user-images.githubusercontent.com/558581/126578757-7171c714-ee6b-49ea-a998-fe73bb3f4450.png)
+![](https://user-images.githubusercontent.com/558581/127429607-d67b6785-050f-4944-bd11-f31870ed43a0.png)
 
-[Mermaid live editor playground link](https://mermaid-js.github.io/mermaid-live-editor/edit/#eyJjb2RlIjoiZmxvd2NoYXJ0IEJUXG4gICAgc3ViZ3JhcGggbGl2ZVxuICAgICAgICBtYXJrZXIxPlwibWFya2VyXCJdIC0tLS0-IEIgLS0tLS0tLS0tLS0tLS0-IEFcbiAgICBlbmRcbiAgICBcbiAgICBzdWJncmFwaCBjaHVuazBcbiAgICAgICAgY2h1bmswLWNodW5rW1tcImNodW5rXCJdXSAtLT4gY2h1bmswLTIoKFwiMlwiKSkgLS0-IGNodW5rMC0xKCgxKSkgLS0-IGNodW5rMC0wKCgwKSkgLS0-IGNodW5rMC1pbnNlcnRpb25bL2luc2VydGlvblxcXVxuICAgIGVuZFxuXG4gICAgc3ViZ3JhcGggY2h1bmsxXG4gICAgICAgIGNodW5rMS1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMS0yKChcIjJcIikpIC0tPiBjaHVuazEtMSgoMSkpIC0tPiBjaHVuazEtMCgoMCkpIC0tPiBjaHVuazEtaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcbiAgICBcbiAgICBzdWJncmFwaCBjaHVuazJcbiAgICAgICAgY2h1bmsyLWNodW5rW1tcImNodW5rXCJdXSAtLT4gY2h1bmsyLTIoKFwiMlwiKSkgLS0-IGNodW5rMi0xKCgxKSkgLS0-IGNodW5rMi0wKCgwKSkgLS0-IGNodW5rMi1pbnNlcnRpb25bL2luc2VydGlvblxcXVxuICAgIGVuZFxuXG4gICAgbWFya2VyMSAtLi0-IGNodW5rMC1pbnNlcnRpb25CYXNlXG4gICAgY2h1bmswLWluc2VydGlvbkJhc2VbL2luc2VydGlvblxcXSAtLS0tLS0tPiBBXG4gICAgY2h1bmswLWNodW5rIC0uLT4gY2h1bmswLWluc2VydGlvbkJhc2VcbiAgICBjaHVuazAtaW5zZXJ0aW9uIC0tLS0tLS0-IEFcbiAgICBjaHVuazEtaW5zZXJ0aW9uIC0tPiBBXG4gICAgY2h1bmsxLWNodW5rIC0uLT4gY2h1bmswLWluc2VydGlvblxuICAgIGNodW5rMi1pbnNlcnRpb24gLS0-IEFcbiAgICBjaHVuazItY2h1bmsgLS4tPiBjaHVuazEtaW5zZXJ0aW9uIiwibWVybWFpZCI6Int9IiwidXBkYXRlRWRpdG9yIjpmYWxzZSwiYXV0b1N5bmMiOnRydWUsInVwZGF0ZURpYWdyYW0iOmZhbHNlfQ)
+[Mermaid live editor playground link](https://mermaid-js.github.io/mermaid-live-editor/edit/#eyJjb2RlIjoiZmxvd2NoYXJ0IEJUXG4gICAgc3ViZ3JhcGggbGl2ZVxuICAgICAgICBtYXJrZXIxPlwibWFya2VyXCJdIC0tLS0-IEIgLS0tLS0tLS0tLS0tLS0tLS0-IEFcbiAgICBlbmRcbiAgICBcbiAgICBzdWJncmFwaCBjaHVuazBcbiAgICAgICAgY2h1bmswLWNodW5rW1tcImNodW5rXCJdXSAtLT4gY2h1bmswLTIoKFwiMlwiKSkgLS0-IGNodW5rMC0xKCgxKSkgLS0-IGNodW5rMC0wKCgwKSkgLS0-IGNodW5rMC1pbnNlcnRpb25bL2luc2VydGlvblxcXVxuICAgIGVuZFxuXG4gICAgc3ViZ3JhcGggY2h1bmsxXG4gICAgICAgIGNodW5rMS1jaHVua1tbXCJjaHVua1wiXV0gLS0-IGNodW5rMS0yKChcIjJcIikpIC0tPiBjaHVuazEtMSgoMSkpIC0tPiBjaHVuazEtMCgoMCkpIC0tPiBjaHVuazEtaW5zZXJ0aW9uWy9pbnNlcnRpb25cXF1cbiAgICBlbmRcbiAgICBcbiAgICBzdWJncmFwaCBjaHVuazJcbiAgICAgICAgY2h1bmsyLWNodW5rW1tcImNodW5rXCJdXSAtLT4gY2h1bmsyLTIoKFwiMlwiKSkgLS0-IGNodW5rMi0xKCgxKSkgLS0-IGNodW5rMi0wKCgwKSkgLS0-IGNodW5rMi1pbnNlcnRpb25bL2luc2VydGlvblxcXVxuICAgIGVuZFxuXG4gICAgXG4gICAgbWFya2VyMSAtLi0-IGNodW5rMC1pbnNlcnRpb25CYXNlXG4gICAgY2h1bmswLWluc2VydGlvbkJhc2VbL2luc2VydGlvblxcXSAtLS0tLS0tLS0tLS0tPiBBXG4gICAgY2h1bmswLWNodW5rIC0uLT4gY2h1bmswLWluc2VydGlvbkJhc2VbL2luc2VydGlvblxcXVxuICAgIGNodW5rMS1jaHVuayAtLi0-IGNodW5rMC1pbnNlcnRpb25cbiAgICBjaHVuazItY2h1bmsgLS4tPiBjaHVuazEtaW5zZXJ0aW9uXG4iLCJtZXJtYWlkIjoie30iLCJ1cGRhdGVFZGl0b3IiOmZhbHNlLCJhdXRvU3luYyI6dHJ1ZSwidXBkYXRlRGlhZ3JhbSI6ZmFsc2V9)
 
 <details>
 <summary>mermaid graph syntax</summary>
 
 ```mermaid
 flowchart BT
     subgraph live
-        marker1>"marker"] ----> B --------------> A
+        marker1>"marker"] ----> B -----------------> A
     end
     
     subgraph chunk0
@@ -241,13 +236,11 @@ flowchart BT
         chunk2-chunk[["chunk"]] --> chunk2-2(("2")) --> chunk2-1((1)) --> chunk2-0((0)) --> chunk2-insertion[/insertion\]
     end
 
+    
     marker1 -.-> chunk0-insertionBase
-    chunk0-insertionBase[/insertion\] -------> A
-    chunk0-chunk -.-> chunk0-insertionBase
-    chunk0-insertion -------> A
-    chunk1-insertion --> A
+    chunk0-insertionBase[/insertion\] -------------> A
+    chunk0-chunk -.-> chunk0-insertionBase[/insertion\]
     chunk1-chunk -.-> chunk0-insertion
-    chunk2-insertion --> A
     chunk2-chunk -.-> chunk1-insertion
 ```
 
@@ -257,7 +250,6 @@ flowchart BT
 
 
 
-
 ### Limit who can send historical messages
 
 Since events being silently sent in the past is hard to moderate, it will probably be good to limit who can add historical messages to the timeline. The batch send endpoint is already limited to application services but we also need to limit who can send "insertion", "chunk", and "marker" events since someone can attempt to send them via the normal `/send` API (we don't want any nasty weird knots to reconcile either)