fix(webapp): route recordEvent/traceEvent batched writes through insertMany

The postgres-writes-disabled guard was bypassed: recordEvent and traceEvent fed
the flush scheduler directly for non-immediate events, so they still wrote to
PostgreSQL with the flag on. Route both through the guarded insertMany, making
it the only feeder of the flush scheduler.

Author: ericallam

apps/webapp/app/v3/eventRepository/eventRepository.server.ts

@@ -1027,7 +1027,7 @@ export class EventRepository implements IEventRepository {
     if (options.immediate) {
       await this.insertImmediate(event);
     } else {
-      this._flushScheduler.addToBatch([this.#createableEventToPrismaEvent(event)]);
+      this.insertMany([event]);
     }
   }
 
@@ -1161,7 +1161,7 @@ export class EventRepository implements IEventRepository {
     if (options.immediate) {
       await this.insertImmediate(event);
     } else {
-      this._flushScheduler.addToBatch([this.#createableEventToPrismaEvent(event)]);
+      this.insertMany([event]);
     }
 
     return result;