feat(webapp): extend SyntheticRun for replay (Phase B4)

The mollifier read-fallback's SyntheticRun previously carried just
enough fields for the API retrieve/trace/spans/events/attempts/metadata
endpoints. Phase C5 (replay) needs the buffered run to be passable
where ReplayTaskRunService expects a TaskRun. Adds the missing fields:
id, runtimeEnvironmentId, engine, workerQueue, queue, concurrencyKey,
machinePreset, realtimeStreamsVersion, seedMetadata, seedMetadataType,
runTags. All populated from the engine-trigger snapshot embedded in
the buffer entry.

Also closes a pre-existing typecheck gap in
ApiRetrieveRunPresenter.synthesiseFoundRunFromBuffer — workerQueue
wasn't populated and the file had been failing tsc. Now surfaces the
buffered run's workerQueue, defaulting to "main" (the Prisma default).

.server-changes/mollifier-synthetic-run-replay-fields.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: improvement
+---
+
+Extend `SyntheticRun` (the mollifier read-fallback synthesised TaskRun shape) with the fields `ReplayTaskRunService` reads: `id`, `runtimeEnvironmentId`, `engine`, `workerQueue`, `queue`, `concurrencyKey`, `machinePreset`, `realtimeStreamsVersion`, `seedMetadata`, `seedMetadataType`, and `runTags`. Populated from the buffered run's engine-trigger snapshot. Also closes a pre-existing typecheck gap in `ApiRetrieveRunPresenter.synthesiseFoundRunFromBuffer` by surfacing `workerQueue` (defaulting to `"main"`) on the synthesised FoundRun.

apps/webapp/app/presenters/v3/ApiRetrieveRunPresenter.server.ts

@@ -573,6 +573,7 @@ function synthesiseFoundRunFromBuffer(buffered: SyntheticRun): FoundRun {
     attemptNumber: null,
     engine: "V2",
     taskEventStore: "taskEvent",
+    workerQueue: buffered.workerQueue ?? "main",
     parentTaskRun: null,
     rootTaskRun: null,
     childRuns: [],

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

@@ -1,4 +1,5 @@
 import type { MollifierBuffer } from "@trigger.dev/redis-worker";
+import { RunId } from "@trigger.dev/core/v3/isomorphic";
 import { logger } from "~/services/logger.server";
 import { deserialiseMollifierSnapshot } from "./mollifierSnapshot.server";
 import { getMollifierBuffer } from "./mollifierBuffer.server";
@@ -10,6 +11,10 @@ export type ReadFallbackInput = {
 };
 
 export type SyntheticRun = {
+  // Snapshot-derived TaskRun primary key. Used by ReplayTaskRunService
+  // for logging and by callers passing this object where a TaskRun is
+  // expected (cast). Derived deterministically from `friendlyId`.
+  id: string;
   friendlyId: string;
   status: "QUEUED" | "FAILED";
   taskIdentifier: string | undefined;
@@ -19,6 +24,12 @@ export type SyntheticRun = {
   payloadType: string | undefined;
   metadata: unknown;
   metadataType: string | undefined;
+  // Seed-metadata mirrors what `triggerTask.server.ts` writes into the
+  // snapshot: the original metadataPacket data preserved separately from
+  // any later customer mutations. ReplayTaskRunService uses these to
+  // rebuild the replay's metadata.
+  seedMetadata: string | undefined;
+  seedMetadataType: string | undefined;
 
   idempotencyKey: string | undefined;
   idempotencyKeyOptions: string[] | undefined;
@@ -26,6 +37,10 @@ export type SyntheticRun = {
   depth: number;
   ttl: string | undefined;
   tags: string[];
+  // Mirror of `tags` under the PG field name. ReplayTaskRunService reads
+  // `existingTaskRun.runTags`; both names are kept here so a synthetic
+  // run can be passed wherever the PG-shape `runTags` is expected.
+  runTags: string[];
   lockedToVersion: string | undefined;
   resumeParentOnCompletion: boolean;
   parentTaskRunId: string | undefined;
@@ -36,6 +51,17 @@ export type SyntheticRun = {
   spanId: string | undefined;
   parentSpanId: string | undefined;
 
+  // Replay-relevant fields populated from the engine-trigger snapshot.
+  // ReplayTaskRunService reads each of these from the existing TaskRun;
+  // when the original lives in the buffer we synthesise them here.
+  runtimeEnvironmentId: string | undefined;
+  engine: "V2";
+  workerQueue: string | undefined;
+  queue: string | undefined;
+  concurrencyKey: string | undefined;
+  machinePreset: string | undefined;
+  realtimeStreamsVersion: string | undefined;
+
   error?: { code: string; message: string };
 };
 
@@ -77,7 +103,14 @@ export async function findRunByIdWithMollifierFallback(
       ? asStringArray(idempotencyKeyOptionsRaw)
       : undefined;
 
+    const tags = asStringArray(snapshot.tags);
+    const environment =
+      snapshot.environment && typeof snapshot.environment === "object"
+        ? (snapshot.environment as Record<string, unknown>)
+        : undefined;
+
     return {
+      id: RunId.fromFriendlyId(entry.runId),
       friendlyId: entry.runId,
       status: entry.status === "FAILED" ? "FAILED" : "QUEUED",
       taskIdentifier: asString(snapshot.taskIdentifier),
@@ -87,13 +120,16 @@ export async function findRunByIdWithMollifierFallback(
       payloadType: asString(snapshot.payloadType),
       metadata: snapshot.metadata,
       metadataType: asString(snapshot.metadataType),
+      seedMetadata: asString(snapshot.seedMetadata),
+      seedMetadataType: asString(snapshot.seedMetadataType),
 
       idempotencyKey: asString(snapshot.idempotencyKey),
       idempotencyKeyOptions,
       isTest: snapshot.isTest === true,
       depth: typeof snapshot.depth === "number" ? snapshot.depth : 0,
       ttl: asString(snapshot.ttl),
-      tags: asStringArray(snapshot.tags),
+      tags,
+      runTags: tags,
       lockedToVersion: asString(snapshot.lockToVersion),
       resumeParentOnCompletion: snapshot.resumeParentOnCompletion === true,
       parentTaskRunId: asString(snapshot.parentTaskRunId),
@@ -102,6 +138,15 @@ export async function findRunByIdWithMollifierFallback(
       spanId: asString(snapshot.spanId),
       parentSpanId: asString(snapshot.parentSpanId),
 
+      runtimeEnvironmentId:
+        asString(environment?.id) ?? entry.envId,
+      engine: "V2",
+      workerQueue: asString(snapshot.workerQueue),
+      queue: asString(snapshot.queue),
+      concurrencyKey: asString(snapshot.concurrencyKey),
+      machinePreset: asString(snapshot.machine),
+      realtimeStreamsVersion: asString(snapshot.realtimeStreamsVersion),
+
       error: entry.lastError,
     };
   } catch (err) {

apps/webapp/test/mollifierReadFallback.test.ts

@@ -216,4 +216,63 @@ describe("findRunByIdWithMollifierFallback", () => {
     expect(result!.traceId).toBeUndefined();
     expect(result!.spanId).toBeUndefined();
   });
+
+  it("populates replay-relevant fields from the snapshot", async () => {
+    const entry: BufferEntry = {
+      runId: "run_1",
+      envId: "env_a",
+      orgId: "org_1",
+      payload: JSON.stringify({
+        taskIdentifier: "my-task",
+        environment: { id: "env_a" },
+        workerQueue: "default",
+        queue: "task/my-task",
+        concurrencyKey: "tenant-42",
+        machine: "medium-1x",
+        realtimeStreamsVersion: "v2",
+        seedMetadata: '{"k":"v"}',
+        seedMetadataType: "application/json",
+        tags: ["t1", "t2"],
+      }),
+      status: "QUEUED",
+      attempts: 0,
+      createdAt: NOW,
+    };
+    const result = await findRunByIdWithMollifierFallback(
+      { runId: "run_1", environmentId: "env_a", organizationId: "org_1" },
+      { getBuffer: () => fakeBuffer(entry) },
+    );
+    expect(result).not.toBeNull();
+    expect(result!.id).toBeTypeOf("string");
+    expect(result!.id.length).toBeGreaterThan(0);
+    expect(result!.engine).toBe("V2");
+    expect(result!.runtimeEnvironmentId).toBe("env_a");
+    expect(result!.workerQueue).toBe("default");
+    expect(result!.queue).toBe("task/my-task");
+    expect(result!.concurrencyKey).toBe("tenant-42");
+    expect(result!.machinePreset).toBe("medium-1x");
+    expect(result!.realtimeStreamsVersion).toBe("v2");
+    expect(result!.seedMetadata).toBe('{"k":"v"}');
+    expect(result!.seedMetadataType).toBe("application/json");
+    expect(result!.runTags).toEqual(["t1", "t2"]);
+  });
+
+  it("falls back to entry.envId for runtimeEnvironmentId when snapshot lacks environment.id", async () => {
+    const entry: BufferEntry = {
+      runId: "run_1",
+      envId: "env_a",
+      orgId: "org_1",
+      payload: JSON.stringify({ taskIdentifier: "t" }),
+      status: "QUEUED",
+      attempts: 0,
+      createdAt: NOW,
+    };
+    const result = await findRunByIdWithMollifierFallback(
+      { runId: "run_1", environmentId: "env_a", organizationId: "org_1" },
+      { getBuffer: () => fakeBuffer(entry) },
+    );
+    expect(result!.runtimeEnvironmentId).toBe("env_a");
+    expect(result!.workerQueue).toBeUndefined();
+    expect(result!.queue).toBeUndefined();
+  });
 });