diff --git a/README.md b/README.md
index f9c4cb2b..c2dd5277 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,13 @@ Only a scalar can name a file. If a path resolves to an object or array the
 sample falls back to `untitled-<hash>`, which is a signal that the
 identifier is wrong for that payload rather than something to work around.
 
-The resolver is covered by unit tests in `topic.test.ts`. Run them with
+The resolved topic becomes the file name through `safeStem`, the same rule
+the registry uses for its doc samples: each run of characters outside
+`[A-Za-z0-9._-]` becomes one `.`, with leading and trailing dots dropped
+(`soft bounce` → `soft.bounce.json`). A capture therefore overwrites the
+doc sample for its event instead of landing beside it.
+
+The resolver and `safeStem` are covered by unit tests in `topic.test.ts`. Run them with
 `yarn test`.
 
 `provenance` is optional and records, per version, how that version's
diff --git a/providers/relay-messenger/latest/chat.created.json b/providers/relay-messenger/2026-08-30/chat.created.json
similarity index 100%
rename from providers/relay-messenger/latest/chat.created.json
rename to providers/relay-messenger/2026-08-30/chat.created.json
diff --git a/providers/relay-messenger/latest/chat.typing_indicator.started.json b/providers/relay-messenger/2026-08-30/chat.typing_indicator.started.json
similarity index 100%
rename from providers/relay-messenger/latest/chat.typing_indicator.started.json
rename to providers/relay-messenger/2026-08-30/chat.typing_indicator.started.json
diff --git a/providers/relay-messenger/latest/chat.typing_indicator.stopped.json b/providers/relay-messenger/2026-08-30/chat.typing_indicator.stopped.json
similarity index 100%
rename from providers/relay-messenger/latest/chat.typing_indicator.stopped.json
rename to providers/relay-messenger/2026-08-30/chat.typing_indicator.stopped.json
diff --git a/providers/relay-messenger/latest/message.delivered.json b/providers/relay-messenger/2026-08-30/message.delivered.json
similarity index 100%
rename from providers/relay-messenger/latest/message.delivered.json
rename to providers/relay-messenger/2026-08-30/message.delivered.json
diff --git a/providers/relay-messenger/latest/message.failed.json b/providers/relay-messenger/2026-08-30/message.failed.json
similarity index 100%
rename from providers/relay-messenger/latest/message.failed.json
rename to providers/relay-messenger/2026-08-30/message.failed.json
diff --git a/providers/relay-messenger/latest/message.read.json b/providers/relay-messenger/2026-08-30/message.read.json
similarity index 100%
rename from providers/relay-messenger/latest/message.read.json
rename to providers/relay-messenger/2026-08-30/message.read.json
diff --git a/providers/relay-messenger/latest/message.received.json b/providers/relay-messenger/2026-08-30/message.received.json
similarity index 100%
rename from providers/relay-messenger/latest/message.received.json
rename to providers/relay-messenger/2026-08-30/message.received.json
diff --git a/providers/relay-messenger/latest/message.sent.json b/providers/relay-messenger/2026-08-30/message.sent.json
similarity index 100%
rename from providers/relay-messenger/latest/message.sent.json
rename to providers/relay-messenger/2026-08-30/message.sent.json
diff --git a/providers/relay-messenger/index.json b/providers/relay-messenger/index.json
index ae0fac7a..70c6dbe0 100644
--- a/providers/relay-messenger/index.json
+++ b/providers/relay-messenger/index.json
@@ -1,11 +1,11 @@
 {
   "label": "Relay",
   "configs": {
-    "latest_version": "latest",
+    "latest_version": "2026-08-30",
     "topic_identifier": "event_type"
   },
   "provenance": {
-    "latest": {
+    "2026-08-30": {
       "sourced_via": "docs",
       "sourced_on": "2026-10-26"
     }
diff --git a/requestReceiver.ts b/requestReceiver.ts
index 59f045ee..ee03701c 100644
--- a/requestReceiver.ts
+++ b/requestReceiver.ts
@@ -2,7 +2,7 @@ import express from "express";
 import * as fs from "fs";
 import * as path from "path";
 import crypto from "crypto";
-import { resolveTopic } from "./topic";
+import { resolveTopic, safeStem } from "./topic";
 
 const app = express();
 const port = process.env.PORT || 9001;
@@ -85,7 +85,7 @@ const outputToFile = (output: any, provider: string, version: string) => {
       "providers",
       provider,
       version,
-      `${topic.replace(/[/:\\]/g, ".")}.json`
+      `${safeStem(topic)}.json`
     ),
     JSON.stringify(output, null, 2)
   );
diff --git a/topic.test.ts b/topic.test.ts
index ab1148e9..40e2b823 100644
--- a/topic.test.ts
+++ b/topic.test.ts
@@ -1,7 +1,9 @@
 import { strict as assert } from "node:assert";
+import { existsSync } from "node:fs";
+import { join } from "node:path";
 import { describe, it } from "node:test";
 
-import { resolveTopic, scalarOrUndefined } from "./topic";
+import { resolveTopic, safeStem, scalarOrUndefined } from "./topic";
 
 describe("resolveTopic", () => {
   it("resolves a plain key", () => {
@@ -83,3 +85,40 @@ describe("scalarOrUndefined", () => {
     assert.equal(scalarOrUndefined(true), undefined);
   });
 });
+
+// Each case is a topic whose doc sample is already in providers/ under the registry's
+// stem, so a capture of the same event has to be written to that same file.
+describe("safeStem", () => {
+  const cases: [string, string, string][] = [
+    ["pubnub/latest", "pubnub.com/schemas/events/channel.created?v=1.0.0",
+      "pubnub.com.schemas.events.channel.created.v.1.0.0"],
+    ["mailtrap/latest", "soft bounce", "soft.bounce"],
+    ["descope/latest", "Change Password", "Change.Password"],
+    ["document360/latest", "Extension token deleted", "Extension.token.deleted"],
+    ["flexport/latest", "/shipment_leg#departed", "shipment_leg.departed"],
+    ["castle/v1", "$list_item.created", "list_item.created"],
+  ];
+
+  for (const [dir, topic, stem] of cases) {
+    it(`names ${JSON.stringify(topic)} as the registry does (${dir}/${stem}.json)`, () => {
+      assert.equal(safeStem(topic), stem);
+      assert.ok(existsSync(join(__dirname, "providers", dir, `${stem}.json`)));
+    });
+  }
+
+  it("collapses a run of unsafe characters into one dot", () => {
+    assert.equal(safeStem("a :/\\ b"), "a.b");
+  });
+
+  it("keeps dots, dashes and underscores", () => {
+    assert.equal(safeStem("charge.succeeded_v-2"), "charge.succeeded_v-2");
+  });
+
+  it("strips leading and trailing dots", () => {
+    assert.equal(safeStem("..a.."), "a");
+  });
+
+  it("never returns an empty stem", () => {
+    assert.equal(safeStem("///"), "_unnamed");
+  });
+});
diff --git a/topic.ts b/topic.ts
index 7b1c0b95..3b3379c0 100644
--- a/topic.ts
+++ b/topic.ts
@@ -50,3 +50,12 @@ export const scalarOrUndefined = (value: any): string | undefined =>
   typeof value === "string" || typeof value === "number"
     ? String(value)
     : undefined;
+
+// The file stem for a topic, the same rule hookdeck/webhook-registry's generator
+// uses for every sample it exports (safe_stem in generator/harvest_doc_examples.py):
+// each run of characters outside [A-Za-z0-9._-] becomes one ".", and leading or
+// trailing dots are dropped. A capture has to land on the doc sample's file name,
+// otherwise it is written as a duplicate beside it ("soft bounce" -> soft.bounce,
+// not "soft bounce"; a PubNub "...channel.created?v=1.0.0" -> "...channel.created.v.1.0.0").
+export const safeStem = (topic: string): string =>
+  topic.replace(/[^A-Za-z0-9._-]+/g, ".").replace(/^\.+|\.+$/g, "") || "_unnamed";