diff --git a/.server-changes/strip-background-worker-metadata.md b/.server-changes/strip-background-worker-metadata.md
new file mode 100644
index 0000000000..c92ee62b1d
--- /dev/null
+++ b/.server-changes/strip-background-worker-metadata.md
@@ -0,0 +1,6 @@
+---
+area: webapp
+type: improvement
+---
+
+Strip BackgroundWorker.metadata to the schedule slice read at deploy promotion, removing a 5+ second event-loop block in Prisma's client serializer when creating workers for projects with many tasks or source files.
diff --git a/apps/webapp/app/v3/services/createBackgroundWorker.server.ts b/apps/webapp/app/v3/services/createBackgroundWorker.server.ts
index c838132724..459686ed97 100644
--- a/apps/webapp/app/v3/services/createBackgroundWorker.server.ts
+++ b/apps/webapp/app/v3/services/createBackgroundWorker.server.ts
@@ -29,6 +29,32 @@ import { tryCatch } from "@trigger.dev/core/v3";
 import { engine } from "../runEngine.server";
 import { scheduleEngine } from "../scheduleEngine.server";
 
+/**
+ * Strip BackgroundWorkerMetadata down to the slice that's actually read after
+ * storage. Everything else is duplicated to dedicated columns/tables
+ * (BackgroundWorker.{contentHash,cliVersion,sdkVersion,runtime,runtimeVersion},
+ * BackgroundWorkerTask, BackgroundWorkerFile, TaskQueue, Prompt). Today the
+ * only post-write reader is changeCurrentDeployment.server.ts, which feeds
+ * tasks[].schedule into syncDeclarativeSchedules. packageVersion, contentHash,
+ * and tasks[].filePath are kept solely to satisfy BackgroundWorkerMetadata's
+ * required fields when the column is parsed back.
+ */
+export function stripBackgroundWorkerMetadataForStorage(
+  metadata: BackgroundWorkerMetadata
+): Prisma.InputJsonValue {
+  return {
+    packageVersion: metadata.packageVersion,
+    contentHash: metadata.contentHash,
+    tasks: metadata.tasks
+      .filter((t) => t.schedule)
+      .map((t) => ({
+        id: t.id,
+        filePath: t.filePath,
+        schedule: t.schedule,
+      })),
+  };
+}
+
 export class CreateBackgroundWorkerService extends BaseService {
   public async call(
     projectRef: string,
@@ -79,8 +105,7 @@ export class CreateBackgroundWorkerService extends BaseService {
           version: nextVersion,
           runtimeEnvironmentId: environment.id,
           projectId: project.id,
-          // body.metadata has an index signature that Prisma doesn't like (from the JSONSchema type) so we are safe to just cast it
-          metadata: body.metadata as Prisma.InputJsonValue,
+          metadata: stripBackgroundWorkerMetadataForStorage(body.metadata),
           contentHash: body.metadata.contentHash,
           cliVersion: body.metadata.cliPackageVersion,
           sdkVersion: body.metadata.packageVersion,
diff --git a/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV3.server.ts b/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV3.server.ts
index 9743cffcdb..f20a024d2d 100644
--- a/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV3.server.ts
+++ b/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV3.server.ts
@@ -1,5 +1,5 @@
 import { CreateBackgroundWorkerRequestBody, tryCatch } from "@trigger.dev/core/v3";
-import type { BackgroundWorker, Prisma } from "@trigger.dev/database";
+import type { BackgroundWorker } from "@trigger.dev/database";
 import { AuthenticatedEnvironment } from "~/services/apiAuth.server";
 import { logger } from "~/services/logger.server";
 import { syncTaskIdentifiers } from "~/services/taskIdentifierRegistry.server";
@@ -7,7 +7,11 @@ import { socketIo } from "../handleSocketIo.server";
 import { updateEnvConcurrencyLimits } from "../runQueue.server";
 import { PerformDeploymentAlertsService } from "./alerts/performDeploymentAlerts.server";
 import { BaseService } from "./baseService.server";
-import { createWorkerResources, syncDeclarativeSchedules } from "./createBackgroundWorker.server";
+import {
+  createWorkerResources,
+  stripBackgroundWorkerMetadataForStorage,
+  syncDeclarativeSchedules,
+} from "./createBackgroundWorker.server";
 import { ExecuteTasksWaitingForDeployService } from "./executeTasksWaitingForDeploy";
 import { projectPubSub } from "./projectPubSub.server";
 import { TimeoutDeploymentService } from "./timeoutDeployment.server";
@@ -49,8 +53,7 @@ export class CreateDeploymentBackgroundWorkerServiceV3 extends BaseService {
           version: deployment.version,
           runtimeEnvironmentId: environment.id,
           projectId: environment.projectId,
-          // body.metadata has an index signature that Prisma doesn't like (from the JSONSchema type) so we are safe to just cast it
-          metadata: body.metadata as Prisma.InputJsonValue,
+          metadata: stripBackgroundWorkerMetadataForStorage(body.metadata),
           contentHash: body.metadata.contentHash,
           cliVersion: body.metadata.cliPackageVersion,
           sdkVersion: body.metadata.packageVersion,
diff --git a/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV4.server.ts b/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV4.server.ts
index cc73a8569d..67269c88d8 100644
--- a/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV4.server.ts
+++ b/apps/webapp/app/v3/services/createDeploymentBackgroundWorkerV4.server.ts
@@ -1,11 +1,12 @@
 import { CreateBackgroundWorkerRequestBody, logger, tryCatch } from "@trigger.dev/core/v3";
 import { BackgroundWorkerId } from "@trigger.dev/core/v3/isomorphic";
-import type { BackgroundWorker, Prisma, WorkerDeployment } from "@trigger.dev/database";
+import type { BackgroundWorker, WorkerDeployment } from "@trigger.dev/database";
 import { AuthenticatedEnvironment } from "~/services/apiAuth.server";
 import { BaseService, ServiceValidationError } from "./baseService.server";
 import {
   createBackgroundFiles,
   createWorkerResources,
+  stripBackgroundWorkerMetadataForStorage,
   syncDeclarativeSchedules,
 } from "./createBackgroundWorker.server";
 import { TimeoutDeploymentService } from "./timeoutDeployment.server";
@@ -65,8 +66,7 @@ export class CreateDeploymentBackgroundWorkerServiceV4 extends BaseService {
           version: deployment.version,
           runtimeEnvironmentId: environment.id,
           projectId: environment.projectId,
-          // body.metadata has an index signature that Prisma doesn't like (from the JSONSchema type) so we are safe to just cast it
-          metadata: body.metadata as Prisma.InputJsonValue,
+          metadata: stripBackgroundWorkerMetadataForStorage(body.metadata),
           contentHash: body.metadata.contentHash,
           cliVersion: body.metadata.cliPackageVersion,
           sdkVersion: body.metadata.packageVersion,