feat(webapp): drainer handler that replays engine.trigger from snapshot

apps/webapp/app/v3/mollifier/mollifierDrainerHandler.server.ts

@@ -0,0 +1,24 @@
+import type { RunEngine } from "@internal/run-engine";
+import type { PrismaClientOrTransaction } from "@trigger.dev/database";
+import type { MollifierDrainerHandler } from "@trigger.dev/redis-worker";
+import type { MollifierSnapshot } from "./mollifierSnapshot.server";
+
+export function isRetryablePgError(err: unknown): boolean {
+  if (!(err instanceof Error)) return false;
+  const msg = err.message ?? "";
+  const code = (err as { code?: string }).code;
+  if (code === "P2024") return true;
+  if (msg.includes("Can't reach database server")) return true;
+  if (msg.includes("Connection lost")) return true;
+  if (msg.includes("ECONNRESET")) return true;
+  return false;
+}
+
+export function createDrainerHandler(deps: {
+  engine: RunEngine;
+  prisma: PrismaClientOrTransaction;
+}): MollifierDrainerHandler<MollifierSnapshot> {
+  return async (input) => {
+    await deps.engine.trigger(input.payload as any, deps.prisma);
+  };
+}