diff --git a/src/lib/categories.ts b/src/lib/categories.ts
index 091bde4e..2f810b43 100644
--- a/src/lib/categories.ts
+++ b/src/lib/categories.ts
@@ -114,7 +114,7 @@ export const CATEGORY_BY_SLUG: ReadonlyMap<string, CategoryEntry> = new Map(
   CATEGORIES.map((c) => [c.slug, c]),
 );
 
-export const CATEGORY_SLUG_BY_LABEL: ReadonlyMap<Category, string> = new Map(
+const CATEGORY_SLUG_BY_LABEL: ReadonlyMap<Category, string> = new Map(
   CATEGORIES.map((c) => [c.label, c.slug]),
 );
 
diff --git a/src/lib/dataset-jsonld.ts b/src/lib/dataset-jsonld.ts
index 6db08662..4fc9f445 100644
--- a/src/lib/dataset-jsonld.ts
+++ b/src/lib/dataset-jsonld.ts
@@ -27,8 +27,8 @@ export const HF_DATASET_URL =
 /** Concept DOI for the dataset on Zenodo. Always resolves to the latest
  *  version. New version DOIs are minted automatically when we push a
  *  new git tag of the form `vX.Y.Z-dataset`. */
-export const ZENODO_CONCEPT_DOI = "10.5281/zenodo.20800311";
-export const ZENODO_CONCEPT_URL = `https://doi.org/${ZENODO_CONCEPT_DOI}`;
+const ZENODO_CONCEPT_DOI = "10.5281/zenodo.20800311";
+const ZENODO_CONCEPT_URL = `https://doi.org/${ZENODO_CONCEPT_DOI}`;
 
 /** Latest parquet headlines snapshot via Hugging Face's auto-converted
  *  parquet API. The repo itself only holds dated partitions
diff --git a/src/lib/materialize/schema.ts b/src/lib/materialize/schema.ts
index 9655f706..b722b841 100644
--- a/src/lib/materialize/schema.ts
+++ b/src/lib/materialize/schema.ts
@@ -69,7 +69,7 @@ export function freshnessOf(meta: StalenessMeta | undefined, now = Date.now()):
  *  display values carry forward separately via StalenessMeta. Cadences
  *  mirror the live loader: 24h = 72 pts @ 20 min, 7d = 84 pts @ 2 h,
  *  30d = 60 pts @ 12 h. */
-export const SeriesRingSchema = z.object({
+const SeriesRingSchema = z.object({
   /** Epoch ms of points[0]. */
   startEpoch: z.number(),
   stepSec: z.number(),
diff --git a/src/lib/search-featured.ts b/src/lib/search-featured.ts
index 8345d860..98b8cade 100644
--- a/src/lib/search-featured.ts
+++ b/src/lib/search-featured.ts
@@ -86,8 +86,9 @@ export async function buildFeaturedLeaders(): Promise<FeaturedLeadersBlob> {
   };
 }
 
-/** Exported for the public endpoint + the dialog's TS type. */
-export const FEATURED_SLUGS = ALL_SLUGS;
+// FEATURED_SLUGS previously re-exported ALL_SLUGS but had zero
+// external consumers. ALL_SLUGS stays used internally by
+// buildFeaturedLeaders below.
 
 /**
  * Worker-safe variant of `buildFeaturedLeaders`. Reads each of the 12
diff --git a/src/lib/time-constants.ts b/src/lib/time-constants.ts
index 1a3f41bb..e80518de 100644
--- a/src/lib/time-constants.ts
+++ b/src/lib/time-constants.ts
@@ -1,20 +1,12 @@
 /**
  * Shared time-unit constants.
  *
- * Single source of truth for the milliseconds / seconds conversions that
- * leak across files as magic numbers (86400, 60_000, 3_600_000, ...).
- * Importing from here makes the intent obvious at the call site and
- * keeps grep-ability if a duration unit ever has to change.
- *
- * Naming convention mirrors the unit-of-measure that the constant
- * EXPANDS into (MS_PER_MINUTE === 60_000 milliseconds in one minute).
+ * Single source of truth for the seconds conversions that leak across
+ * files as magic numbers (86400, 60, 3600). Importing from here makes
+ * the intent obvious at the call site and keeps grep-ability if a
+ * duration unit ever has to change.
  */
 
-export const MS_PER_SECOND = 1_000;
-export const MS_PER_MINUTE = 60_000;
-export const MS_PER_HOUR = 3_600_000;
-export const MS_PER_DAY = 86_400_000;
-
 export const SECONDS_PER_MINUTE = 60;
 export const SECONDS_PER_HOUR = 3_600;
 export const SECONDS_PER_DAY = 86_400;