refactor(plugins): async DB-touching methods; transactions through UnitOfWork

server/src/plugin-user-lifecycle.ts

@@ -6,19 +6,19 @@
 // (the plugin side persists the erasure so nothing is lost if the sink is absent
 // or the runtime is mid-boot).
 
-let sink: ((userId: number) => void) | null = null;
+let sink: ((userId: number) => void | Promise<void>) | null = null;
 
-export function setUserDeletedSink(fn: ((userId: number) => void) | null): void {
+export function setUserDeletedSink(fn: ((userId: number) => void | Promise<void>) | null): void {
   sink = fn;
 }
 
 /** Announce that a TREK account was fully deleted. Called by the core deletion
  * paths after deleteUserCompletely so plugins can erase their own per-user data.
  * Swallows everything: a plugin bookkeeping error must never fail the deletion. */
-export function emitUserDeleted(userId: number): void {
+export async function emitUserDeleted(userId: number): Promise<void> {
   if (!sink) return;
   try {
-    sink(userId);
+    await sink(userId);
   } catch {
     /* the erasure is enqueued transactionally on the plugin side; a sink hiccup
        is non-fatal and the next runtime boot reconciles from the queue */