fix(replay): recover failed archives and release deleted sessions

apps/control-station/src/core/observation/useObservationSessions.ts

@@ -52,6 +52,20 @@ export interface ObservationReplayCoordinator {
   cancel: () => void;
 }
 
+export async function deleteObservationSessionAfterTeardown(
+  sessionId: string,
+  {
+    onDeleteBegin,
+    deleteSession = deleteObservationSession,
+  }: {
+    onDeleteBegin?: (sessionId: string) => void | Promise<void>;
+    deleteSession?: (sessionId: string) => Promise<void>;
+  } = {},
+): Promise<void> {
+  await onDeleteBegin?.(sessionId);
+  await deleteSession(sessionId);
+}
+
 export interface ObservationPreparationPollingOptions {
   signal: AbortSignal;
   fetcher?: ObservationSessionFetch;
@@ -375,6 +389,7 @@ export function useObservationSessions({
   onReplayBegin,
   onReplayAccepted,
   onReplaySettled,
+  onDeleteBegin,
 }: {
   limit?: number;
   scope?: ObservationSessionScope;
@@ -392,6 +407,8 @@ export function useObservationSessions({
     session: ObservationSessionSummary,
     outcome: ObservationReplayOutcome,
   ) => void | Promise<void>;
+  /** Releases an active viewer before its evidence and derived cache are deleted. */
+  onDeleteBegin?: (sessionId: string) => void | Promise<void>;
 } = {}): ObservationSessionsController {
   const [items, setItems] = useState<ObservationSessionSummary[]>([]);
   const [state, setState] = useState<ObservationSessionsLoadState>("idle");
@@ -606,7 +623,7 @@ export function useObservationSessions({
     setDeletingSessionId(sessionId);
     setError(null);
     try {
-      await deleteObservationSession(sessionId);
+      await deleteObservationSessionAfterTeardown(sessionId, { onDeleteBegin });
       if (!mounted.current) return false;
       setItems((current) => current.filter((item) => item.id !== sessionId));
       setFailedSessionId((current) => current === sessionId ? null : current);
@@ -617,7 +634,7 @@ export function useObservationSessions({
     } finally {
       if (mounted.current) setDeletingSessionId(null);
     }
-  }, [deletingSessionId, replayingSessionId]);
+  }, [deletingSessionId, onDeleteBegin, replayingSessionId]);
 
   return {
     items,