diff --git a/plugins/trakt/src/map.ts b/plugins/trakt/src/map.ts
index af188c9..5e231a7 100644
--- a/plugins/trakt/src/map.ts
+++ b/plugins/trakt/src/map.ts
@@ -29,7 +29,7 @@ function movieHint(m: TMovie): WorkHint {
     title: m.title,
     mediaType: "movie",
     ...(m.year ? { year: m.year } : {}),
-    externalIds: ids({ trakt: m.ids.trakt, tmdb_movie: m.ids.tmdb, imdb: m.ids.imdb }),
+    externalIds: ids({ trakt_movie: m.ids.trakt, tmdb_movie: m.ids.tmdb, imdb: m.ids.imdb }),
   };
 }
 
@@ -38,21 +38,26 @@ function showHint(s: TShow): WorkHint {
     title: s.title,
     mediaType: "show",
     ...(s.year ? { year: s.year } : {}),
-    externalIds: ids({ tmdb_show: s.ids.tmdb, tvdb: s.ids.tvdb, imdb: s.ids.imdb, trakt: s.ids.trakt }),
+    externalIds: ids({ trakt_show: s.ids.trakt, tmdb_show: s.ids.tmdb, tvdb_show: s.ids.tvdb, imdb: s.ids.imdb }),
   };
 }
 
-// Season and episode ids are deliberately omitted: their numeric namespaces (tvdb, tmdb, imdb, trakt)
-// are shared with shows/movies, so they are identified by parent chain + position instead.
-function seasonHint(show: TShow, n: number): WorkHint {
-  return { title: `Season ${n}`, mediaType: "season", externalIds: {}, parent: showHint(show), position: { season: n } };
+function seasonHint(show: TShow, n: number, sid?: Ids): WorkHint {
+  return {
+    title: `Season ${n}`,
+    mediaType: "season",
+    externalIds: sid ? ids({ trakt_season: sid.trakt, tmdb_season: sid.tmdb }) : {},
+    parent: showHint(show),
+    position: { season: n },
+  };
 }
 
 function episodeHint(show: TShow, e: TEpisode): WorkHint {
+  const eid = e.ids;
   return {
     title: e.title || `Episode ${e.number}`,
     mediaType: "episode",
-    externalIds: {},
+    externalIds: eid ? ids({ trakt_episode: eid.trakt, tvdb_episode: eid.tvdb, tmdb_episode: eid.tmdb, imdb: eid.imdb }) : {},
     parent: seasonHint(show, e.season),
     position: { season: e.season, episode: e.number },
   };
@@ -63,7 +68,7 @@ export function hintFor(item: TItem): WorkHint | null {
   switch (item.type) {
     case "movie": return item.movie ? movieHint(item.movie) : null;
     case "show": return item.show ? showHint(item.show) : null;
-    case "season": return item.show && item.season ? seasonHint(item.show, item.season.number) : null;
+    case "season": return item.show && item.season ? seasonHint(item.show, item.season.number, item.season.ids) : null;
     case "episode": return item.show && item.episode ? episodeHint(item.show, item.episode) : null;
     default: return null;
   }
diff --git a/plugins/trakt/test/trakt.test.ts b/plugins/trakt/test/trakt.test.ts
index efbd610..accfd1a 100644
--- a/plugins/trakt/test/trakt.test.ts
+++ b/plugins/trakt/test/trakt.test.ts
@@ -61,7 +61,7 @@ describe("trakt pull", () => {
     const r = (await collect(plugin.pull!(ctx))).find((x) => x.key === "history:9001")!;
     if (r.kind !== "engagement") throw new Error("kind");
     expect(r.work.mediaType).toBe("movie");
-    expect(r.work.externalIds).toEqual({ trakt: "1001", tmdb_movie: "329865", imdb: "tt2543164" });
+    expect(r.work.externalIds).toEqual({ trakt_movie: "1001", tmdb_movie: "329865", imdb: "tt2543164" });
     expect(r.engagement.finishedAt).toEqual({ value: "2024-03-05T20:15:00.000Z", precision: "day" });
   });
 
@@ -71,11 +71,12 @@ describe("trakt pull", () => {
     if (r.kind !== "engagement") throw new Error("kind");
     expect(r.work.mediaType).toBe("episode");
     expect(r.work.position).toEqual({ season: 2, episode: 3 });
+    expect(r.work.externalIds).toEqual({ trakt_episode: "5003", tvdb_episode: "7003", tmdb_episode: "8003", imdb: "tt0000003" });
     expect(r.work.parent?.mediaType).toBe("season");
     expect(r.work.parent?.position).toEqual({ season: 2 });
     const show = r.work.parent?.parent;
     expect(show?.mediaType).toBe("show");
-    expect(show?.externalIds).toEqual({ tmdb_show: "80002", tvdb: "70002", imdb: "tt7000002", trakt: "2002" });
+    expect(show?.externalIds).toEqual({ trakt_show: "2002", tmdb_show: "80002", tvdb_show: "70002", imdb: "tt7000002" });
   });
 
   test("rating 8 becomes 80", async () => {
@@ -132,6 +133,16 @@ describe("trakt pull", () => {
     expect(fx.calls[1]!.headers.get("authorization")).toBe("Bearer new-access");
   });
 
+  test("a failed refresh saves nothing and never calls /sync", async () => {
+    const { fx, ctx } = await setup(
+      { ...fullRoutes, [`POST ${B}/oauth/token`]: () => new Response("{}", { status: 400 }) },
+      { ...FRESH, expiresAt: "2024-04-01T12:00:00.000Z" },
+    );
+    await expect(collect(plugin.pull!(ctx))).rejects.toThrow("400");
+    expect(ctx.saved.credentials).toEqual([]);
+    expect(fx.calls.map((c) => new URL(c.url).pathname)).toEqual(["/oauth/token"]);
+  });
+
   test("a token with more than 24h left is not refreshed", async () => {
     const { fx, ctx } = await setup(fullRoutes);
     await collect(plugin.pull!(ctx));