diff --git a/app/features/admin/AdminRepository.server.ts b/app/features/admin/AdminRepository.server.ts
index 642b4455c..f27440e5c 100644
--- a/app/features/admin/AdminRepository.server.ts
+++ b/app/features/admin/AdminRepository.server.ts
@@ -1,10 +1,10 @@
 import type { Transaction } from "kysely";
 import { db, sql } from "~/db/sql";
 import type { DB, Tables, TablesInsertable } from "~/db/tables";
+import * as BadgeRepository from "~/features/badges/BadgeRepository.server";
 import * as BuildRepository from "~/features/builds/BuildRepository.server";
 import { dateToDatabaseTimestamp } from "~/utils/dates";
 import invariant from "~/utils/invariant";
-import { syncXPBadges } from "../badges/queries/syncXPBadges.server";
 
 const removeOldLikesStm = sql.prepare(/*sql*/ `
   delete from 
@@ -239,7 +239,7 @@ export async function linkUserAndPlayer({
 		.where("SplatoonPlayer.id", "=", playerId)
 		.execute();
 
-	syncXPBadges();
+	await BadgeRepository.syncXPBadges();
 	await BuildRepository.recalculateAllTop500();
 }
 
diff --git a/app/features/badges/BadgeRepository.server.test.ts b/app/features/badges/BadgeRepository.server.test.ts
new file mode 100644
index 000000000..0129447a8
--- /dev/null
+++ b/app/features/badges/BadgeRepository.server.test.ts
@@ -0,0 +1,76 @@
+import { afterEach, beforeEach, describe, expect, test } from "vitest";
+import { db } from "~/db/sql";
+import { dbInsertUsers, dbReset } from "~/utils/Test";
+import * as BadgeRepository from "./BadgeRepository.server";
+import { SPLATOON_3_XP_BADGE_VALUES } from "./badges-constants";
+
+describe("syncXPBadges", () => {
+	beforeEach(async () => {
+		await dbInsertUsers(3);
+		await insertXPBadges();
+	});
+
+	afterEach(() => {
+		dbReset();
+	});
+
+	test("assigns badge to user with qualifying peakXp", async () => {
+		await insertSplatoonPlayer({ splId: "abc123", userId: 1, peakXp: 3000 });
+
+		await BadgeRepository.syncXPBadges();
+
+		const badge = await findBadgeByCode("3000");
+		expect(badge?.owners).toHaveLength(1);
+		expect(badge?.owners[0].id).toBe(1);
+	});
+
+	test("assigns highest qualifying badge when peakXp exceeds threshold", async () => {
+		await insertSplatoonPlayer({ splId: "abc123", userId: 1, peakXp: 3250 });
+
+		await BadgeRepository.syncXPBadges();
+
+		const badge3200 = await findBadgeByCode("3200");
+		const badge3300 = await findBadgeByCode("3300");
+
+		expect(badge3200?.owners).toHaveLength(1);
+		expect(badge3300?.owners).toHaveLength(0);
+	});
+
+	test("does not assign badge when peakXp is below minimum threshold", async () => {
+		await insertSplatoonPlayer({ splId: "abc123", userId: 1, peakXp: 2500 });
+
+		await BadgeRepository.syncXPBadges();
+
+		const badge2600 = await findBadgeByCode("2600");
+		expect(badge2600?.owners).toHaveLength(0);
+	});
+});
+
+async function insertXPBadges() {
+	await db
+		.insertInto("Badge")
+		.values(
+			SPLATOON_3_XP_BADGE_VALUES.map((value) => ({
+				code: String(value),
+				displayName: `${value}+ XP`,
+				hue: null,
+				authorId: null,
+			})),
+		)
+		.execute();
+}
+
+async function insertSplatoonPlayer(args: {
+	splId: string;
+	userId: number | null;
+	peakXp: number | null;
+}) {
+	await db.insertInto("SplatoonPlayer").values(args).execute();
+}
+
+async function findBadgeByCode(code: string) {
+	const badges = await BadgeRepository.all();
+	const badge = badges.find((b) => b.code === code);
+	if (!badge) return null;
+	return BadgeRepository.findById(badge.id);
+}
diff --git a/app/features/badges/BadgeRepository.server.ts b/app/features/badges/BadgeRepository.server.ts
index 275e87f72..e66028b47 100644
--- a/app/features/badges/BadgeRepository.server.ts
+++ b/app/features/badges/BadgeRepository.server.ts
@@ -1,8 +1,11 @@
-import type { ExpressionBuilder } from "kysely";
+import type { ExpressionBuilder, NotNull } from "kysely";
 import { jsonArrayFrom, jsonObjectFrom } from "kysely/helpers/sqlite";
 import { db } from "~/db/sql";
 import type { DB } from "~/db/tables";
+import invariant from "~/utils/invariant";
 import { COMMON_USER_FIELDS } from "~/utils/kysely.server";
+import { SPLATOON_3_XP_BADGE_VALUES } from "./badges-constants";
+import { findSplatoon3XpBadgeValue } from "./badges-utils";
 
 const addPermissions = <T extends { managers: { userId: number }[] }>(
 	row: T,
@@ -160,3 +163,46 @@ export function replaceOwners({
 		}
 	});
 }
+
+export async function syncXPBadges() {
+	return db.transaction().execute(async (trx) => {
+		for (const value of SPLATOON_3_XP_BADGE_VALUES) {
+			const badge = await trx
+				.selectFrom("Badge")
+				.select("id")
+				.where("code", "=", String(value))
+				.executeTakeFirst();
+
+			invariant(badge, `Badge ${value} not found`);
+
+			await trx
+				.deleteFrom("TournamentBadgeOwner")
+				.where("badgeId", "=", badge.id)
+				.execute();
+		}
+
+		const userTopXPowers = await trx
+			.selectFrom("SplatoonPlayer")
+			.select(["userId", "peakXp"])
+			.where("userId", "is not", null)
+			.where("peakXp", "is not", null)
+			.$narrowType<{ userId: NotNull; peakXp: NotNull }>()
+			.execute();
+
+		for (const { userId, peakXp } of userTopXPowers) {
+			const badgeValue = findSplatoon3XpBadgeValue(peakXp!);
+			if (!badgeValue) continue;
+
+			await trx
+				.insertInto("TournamentBadgeOwner")
+				.values((eb) => ({
+					badgeId: eb
+						.selectFrom("Badge")
+						.select("id")
+						.where("code", "=", String(badgeValue)),
+					userId,
+				}))
+				.execute();
+		}
+	});
+}
diff --git a/app/features/badges/queries/syncXPBadges.server.ts b/app/features/badges/queries/syncXPBadges.server.ts
deleted file mode 100644
index 502ea41dc..000000000
--- a/app/features/badges/queries/syncXPBadges.server.ts
+++ /dev/null
@@ -1,56 +0,0 @@
-import { sql } from "~/db/sql";
-import invariant from "~/utils/invariant";
-import { SPLATOON_3_XP_BADGE_VALUES } from "../badges-constants";
-import { findSplatoon3XpBadgeValue } from "../badges-utils";
-
-const badgeCodeToIdStm = sql.prepare(/* sql */ `
-  select "id"
-    from "Badge"
-    where "code" = @code
-`);
-
-const deleteBadgeOwnerStm = sql.prepare(/* sql */ `
-  delete from "TournamentBadgeOwner"
-    where "badgeId" = @badgeId
-`);
-
-const userTopXPowersStm = sql.prepare(/* sql */ `
-  select
-    "SplatoonPlayer"."userId",
-    "SplatoonPlayer"."peakXp" as "xPower"
-  from
-    "SplatoonPlayer"
-  where "SplatoonPlayer"."userId" is not null
-    and "SplatoonPlayer"."peakXp" is not null
-`);
-
-const addXPBadgeStm = sql.prepare(/* sql */ `
-  insert into "TournamentBadgeOwner" ("badgeId", "userId")
-  values (
-    (select "id" from "Badge" where "code" = @code),
-    @userId
-  )
-`);
-
-export const syncXPBadges = sql.transaction(() => {
-	for (const value of SPLATOON_3_XP_BADGE_VALUES) {
-		const badgeId = (badgeCodeToIdStm.get({ code: String(value) }) as any)
-			.id as number;
-
-		invariant(badgeId, `Badge ${value} not found`);
-
-		deleteBadgeOwnerStm.run({ badgeId });
-	}
-
-	const userTopXPowers = userTopXPowersStm.all() as Array<{
-		userId: number;
-		xPower: number;
-	}>;
-
-	for (const { userId, xPower } of userTopXPowers) {
-		const badgeValue = findSplatoon3XpBadgeValue(xPower);
-		if (!badgeValue) continue;
-
-		addXPBadgeStm.run({ code: String(badgeValue), userId });
-	}
-});
diff --git a/app/features/top-search/actions/xsearch.player.$id.server.ts b/app/features/top-search/actions/xsearch.player.$id.server.ts
index a095a4f0c..735dfea3c 100644
--- a/app/features/top-search/actions/xsearch.player.$id.server.ts
+++ b/app/features/top-search/actions/xsearch.player.$id.server.ts
@@ -1,6 +1,6 @@
 import type { ActionFunctionArgs } from "react-router";
 import { requireUser } from "~/features/auth/core/user.server";
-import { syncXPBadges } from "~/features/badges/queries/syncXPBadges.server";
+import * as BadgeRepository from "~/features/badges/BadgeRepository.server";
 import { logger } from "~/utils/logger";
 import {
 	errorToastIfFalsy,
@@ -35,7 +35,7 @@ export const action = async ({ params }: ActionFunctionArgs) => {
 
 	await XRankPlacementRepository.unlinkPlayerByUserId(user.id);
 
-	syncXPBadges();
+	await BadgeRepository.syncXPBadges();
 
 	return successToast("Unlink successful");
 };
diff --git a/scripts/placements/index.ts b/scripts/placements/index.ts
index f50ee4eca..4d6a67300 100644
--- a/scripts/placements/index.ts
+++ b/scripts/placements/index.ts
@@ -2,7 +2,7 @@ import "dotenv/config";
 
 import { sql } from "~/db/sql";
 import type { Tables } from "~/db/tables";
-import { syncXPBadges } from "~/features/badges/queries/syncXPBadges.server";
+import * as BadgeRepository from "~/features/badges/BadgeRepository.server";
 import * as BuildRepository from "~/features/builds/BuildRepository.server";
 import * as XRankPlacementRepository from "~/features/top-search/XRankPlacementRepository.server";
 import type { MainWeaponId } from "~/modules/in-game-lists/types";
@@ -55,7 +55,7 @@ async function main() {
 
 	addPlacements(placements);
 	await XRankPlacementRepository.refreshAllPeakXp();
-	syncXPBadges();
+	await BadgeRepository.syncXPBadges();
 	await BuildRepository.recalculateAllTop500();
 	logger.info(`done reading in ${placements.length} placements`);
 }
diff --git a/scripts/sync-xp-badges.ts b/scripts/sync-xp-badges.ts
index da0393803..88d12a3f5 100644
--- a/scripts/sync-xp-badges.ts
+++ b/scripts/sync-xp-badges.ts
@@ -1,7 +1,8 @@
 import "dotenv/config";
-import { syncXPBadges } from "~/features/badges/queries/syncXPBadges.server";
+import * as BadgeRepository from "~/features/badges/BadgeRepository.server";
 import { logger } from "~/utils/logger";
 
-syncXPBadges();
-
-logger.info("Synced XP badges");
+void (async () => {
+	await BadgeRepository.syncXPBadges();
+	logger.info("Synced XP badges");
+})();