[overlays] Fix: Transmit event-id as string

in order to compensate for i.e. CRDB very large IDs being truncated in
JSON transmit

Signed-off-by: Knut Ahlers <knut@ahlers.me>

internal/apimodules/overlays/default/eventclient.js

@@ -11,7 +11,7 @@
 /**
  * SocketMessage received for every event and passed to the new `(eventObj) => { ... }` handlers
  * @typedef {Object} SocketMessage
- * @prop {Number} [event_id] - UID of the event used to re-trigger an event
+ * @prop {String} [event_id] - UID of the event used to re-trigger an event
  * @prop {Boolean} [is_live] - Whether the event was sent through a replay (false) or occurred live (true)
  * @prop {String} [reason] - Reason of this message (one of `bulk-replay`, `live-event`, `single-replay`)
  * @prop {String} [time] - RFC3339 timestamp of the event

internal/apimodules/overlays/overlays.go

@@ -42,7 +42,7 @@ type (
 
 	// socketMessage represents the message overlay sockets will receive
 	socketMessage struct {
-		EventID uint64                           `json:"event_id"`
+		EventID uint64                           `json:"event_id,string"`
 		IsLive  bool                             `json:"is_live"`
 		Reason  sendReason                       `json:"reason"`
 		Time    time.Time                        `json:"time"`