diff --git a/backend/scripts/benchmark_rag.py b/backend/scripts/benchmark_rag.py
index e198a55f..08584c1e 100644
--- a/backend/scripts/benchmark_rag.py
+++ b/backend/scripts/benchmark_rag.py
@@ -8,7 +8,6 @@
 """
 
 import argparse
-import os
 import sys
 import textwrap
 from pathlib import Path
@@ -23,8 +22,8 @@
 from dotenv import load_dotenv
 load_dotenv(Path(__file__).parent.parent / ".env.staging")  # use staging DB
 
-from routes.learn import _get_catalog_chunk
-from services.gemini_service import call_gemini
+from routes.learn import _get_catalog_chunk  # noqa: E402
+from services.gemini_service import call_gemini  # noqa: E402
 
 
 # ── Ground-truth test cases ────────────────────────────────────────────────────
@@ -519,7 +518,7 @@ def main() -> None:
     if filter_course:
         print(f"Filtered to: {filter_course}")
 
-    chunk_results = run_chunk_tests(cases)
+    run_chunk_tests(cases)
 
     if not args.chunks_only:
         llm_results = run_llm_tests(cases, filter_course=filter_course)
diff --git a/backend/scripts/ingest_catalog.py b/backend/scripts/ingest_catalog.py
index 84eb37a3..d2457ade 100644
--- a/backend/scripts/ingest_catalog.py
+++ b/backend/scripts/ingest_catalog.py
@@ -27,7 +27,7 @@
 load_dotenv(Path(__file__).parent.parent / ".env")
 sys.path.insert(0, str(Path(__file__).parent.parent))
 
-from db.connection import table
+from db.connection import table  # noqa: E402
 
 # ── Config ─────────────────────────────────────────────────────────────────────
 
@@ -144,7 +144,7 @@ def main() -> None:
         rec["embedding"] = vec
 
     # Upsert to Supabase in batches of BATCH_SIZE
-    print(f"\nUpserting to course_chunks...")
+    print("\nUpserting to course_chunks...")
     db = table("course_chunks")
     inserted = 0
 
diff --git a/backend/scripts/scrape_bu_catalog.py b/backend/scripts/scrape_bu_catalog.py
index b7112b48..52502021 100644
--- a/backend/scripts/scrape_bu_catalog.py
+++ b/backend/scripts/scrape_bu_catalog.py
@@ -13,7 +13,6 @@
 import asyncio
 import json
 import re
-import sys
 from datetime import datetime, timezone
 from pathlib import Path
 from typing import Optional
@@ -349,7 +348,7 @@ def save_checkpoint(batch: list[dict]) -> None:
         for school in SCHOOLS:
             print(f"\n>> {school}", flush=True)
             before = len(all_courses)
-            school_courses = await scrape_school(client, school, seen_urls, on_batch=save_checkpoint)
+            await scrape_school(client, school, seen_urls, on_batch=save_checkpoint)
             print(f"  [{school}] +{len(all_courses) - before} -> total {len(all_courses)}", flush=True)
 
     elapsed = (datetime.now(timezone.utc) - start).total_seconds()