diff --git a/packages/backend/test/unit/telemetry-database-instrumentation.ts b/packages/backend/test/unit/telemetry-database-instrumentation.ts
index 20b3789a26..eeb3b4e039 100644
--- a/packages/backend/test/unit/telemetry-database-instrumentation.ts
+++ b/packages/backend/test/unit/telemetry-database-instrumentation.ts
@@ -3,9 +3,15 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+import { createRequire } from 'node:module';
+import { context, propagation, trace } from '@opentelemetry/api';
+import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
 import { describe, expect, test, vi } from 'vitest';
+import type { Span as SdkSpan, SpanProcessor } from '@opentelemetry/sdk-trace-base';
 import { installDatabaseInstrumentation, installInstrumentation } from '@/core/telemetry/database-instrumentation.js';
 
+const backendRequire = createRequire(import.meta.url);
+
 describe('database-instrumentation', () => {
 	test('does not install PostgreSQL instrumentation when disabled', async () => {
 		const uninstall = await installDatabaseInstrumentation({} as any, {
@@ -55,6 +61,76 @@ describe('database-instrumentation', () => {
 		expect(pg.disable).toHaveBeenCalledOnce();
 	});
 
+	test('redacts SQL attributes after pg instrumentation records the statement', async () => {
+		const statement = 'SELECT very_secret_literal';
+		const attributeWrites: Array<{ key: string; value: unknown }> = [];
+		let attributesAtStart: Record<string, unknown> | undefined;
+		let pgSpan: SdkSpan | undefined;
+		const spanProcessor: SpanProcessor = {
+			forceFlush: async () => {},
+			onStart: span => {
+				if (span.instrumentationScope.name !== '@opentelemetry/instrumentation-pg') return;
+
+				pgSpan = span;
+				attributesAtStart = { ...span.attributes };
+				const setAttribute = span.setAttribute.bind(span);
+				span.setAttribute = (key, value) => {
+					attributeWrites.push({ key, value });
+					return setAttribute(key, value);
+				};
+			},
+			onEnd: () => {},
+			shutdown: async () => {},
+		};
+		const provider = new NodeTracerProvider({ spanProcessors: [spanProcessor] });
+		provider.register();
+		let uninstall: (() => void) | undefined;
+
+		try {
+			uninstall = await installDatabaseInstrumentation(provider, {
+				capturePgSpans: true,
+				capturePgStatement: false,
+				capturePgConnectionSpans: false,
+			});
+			const { Client } = backendRequire('pg') as typeof import('pg');
+			const tracer = provider.getTracer('database-instrumentation-test');
+
+			tracer.startActiveSpan('parent', parentSpan => {
+				try {
+					// pg instrumentation runs before an unconnected client queues the query,
+					// so no database is required.
+					new Client().query(statement, () => {});
+				} finally {
+					parentSpan.end();
+				}
+			});
+
+			const recordedPgSpan = pgSpan;
+			expect(recordedPgSpan).toBeDefined();
+			if (recordedPgSpan == null) throw new Error('PostgreSQL span was not started.');
+			expect(attributesAtStart).not.toHaveProperty('db.statement');
+			expect(attributesAtStart).not.toHaveProperty('db.query.text');
+
+			const rawSqlIndex = attributeWrites.findIndex(({ key, value }) =>
+				(key === 'db.statement' || key === 'db.query.text') && value === statement);
+			expect(rawSqlIndex).toBeGreaterThanOrEqual(0);
+			const rawSqlKey = attributeWrites[rawSqlIndex].key;
+			expect(attributeWrites.findIndex(({ key, value }, index) =>
+				index > rawSqlIndex && key === rawSqlKey && value === '[REDACTED]')).toBeGreaterThan(rawSqlIndex);
+
+			expect(recordedPgSpan.attributes['db.statement']).toBe('[REDACTED]');
+			expect(recordedPgSpan.attributes['db.query.text']).toBe('[REDACTED]');
+			expect(Object.values(recordedPgSpan.attributes)).not.toContain(statement);
+		} finally {
+			pgSpan?.end();
+			uninstall?.();
+			await provider.shutdown();
+			trace.disable();
+			context.disable();
+			propagation.disable();
+		}
+	});
+
 	test('keeps SQL statement attributes when explicitly enabled', () => {
 		const pg = { setTracerProvider: vi.fn(), enable: vi.fn(), disable: vi.fn() };
 		const config = vi.fn();