Use storage service for call links

protos/SignalService.proto

@@ -622,7 +622,7 @@ message SyncMessage {
   message CallLinkUpdate {
     enum Type {
       UPDATE = 0;
-      DELETE = 1;
+      reserved 1; // was DELETE, superseded by storage service
     }
 
     optional bytes rootKey      = 1;

protos/SignalStorage.proto

@@ -47,6 +47,7 @@ message ManifestRecord {
       ACCOUNT = 4;
       STORY_DISTRIBUTION_LIST = 5;
       STICKER_PACK = 6;
+      CALL_LINK = 7;
     }
 
     optional bytes raw  = 1;
@@ -67,6 +68,7 @@ message StorageRecord {
     AccountRecord account = 4;
     StoryDistributionListRecord storyDistributionList = 5;
     StickerPackRecord stickerPack = 6;
+    CallLinkRecord callLink = 7;
   }
 }
 
@@ -241,3 +243,10 @@ message StickerPackRecord {
                                           // non-zero - `packKey` and `position` should
                                           // be unset
 }
+
+message CallLinkRecord {
+  optional bytes rootKey = 1; // 16 bytes
+  optional bytes adminPasskey = 2; // Non-empty when the current user is an admin
+  optional uint64 deletedAtTimestampMs = 3; // When present and non-zero, `adminPasskey`
+                                            // should be cleared
+}