diff --git a/website/build.py b/website/build.py
index 8689ca90..c223ef18 100644
--- a/website/build.py
+++ b/website/build.py
@@ -6,6 +6,7 @@ import re
 import shutil
 from datetime import UTC, datetime
 from pathlib import Path
+from typing import Any
 
 from jinja2 import Environment, FileSystemLoader
 from readme_parser import ParsedGroup, ParsedSection, parse_readme, parse_sponsors
@@ -75,45 +76,40 @@ def extract_entries(
     Entries appearing in multiple categories are merged into a single entry
     with lists of categories and groups.
     """
-    cat_to_group: dict[str, str] = {}
-    for group in groups:
-        for cat in group["categories"]:
-            cat_to_group[cat["name"]] = group["name"]
+    cat_to_group = {cat["name"]: group["name"] for group in groups for cat in group["categories"]}
 
-    seen: dict[tuple[str, str], dict] = {}  # (url, name) -> entry
-    entries: list[dict] = []
+    seen: dict[tuple[str, str], dict[str, Any]] = {}  # (url, name) -> entry
+    entries: list[dict[str, Any]] = []
     for cat in categories:
         group_name = cat_to_group.get(cat["name"], "Other")
         for entry in cat["entries"]:
-            url = entry["url"]
-            key = (url, entry["name"])
-            if key in seen:
-                existing = seen[key]
-                if cat["name"] not in existing["categories"]:
-                    existing["categories"].append(cat["name"])
-                if group_name not in existing["groups"]:
-                    existing["groups"].append(group_name)
-                subcat = entry["subcategory"]
-                if subcat:
-                    scoped = f"{cat['name']} > {subcat}"
-                    if not any(s["value"] == scoped for s in existing["subcategories"]):
-                        existing["subcategories"].append({"name": subcat, "value": scoped})
-            else:
-                merged = {
+            key = (entry["url"], entry["name"])
+            existing: dict[str, Any] | None = seen.get(key)
+            if existing is None:
+                existing = {
                     "name": entry["name"],
-                    "url": url,
+                    "url": entry["url"],
                     "description": entry["description"],
-                    "categories": [cat["name"]],
-                    "groups": [group_name],
-                    "subcategories": [{"name": entry["subcategory"], "value": f"{cat['name']} > {entry['subcategory']}"}] if entry["subcategory"] else [],
+                    "categories": [],
+                    "groups": [],
+                    "subcategories": [],
                     "stars": None,
                     "owner": None,
                     "last_commit_at": None,
-                    "source_type": detect_source_type(url),
+                    "source_type": detect_source_type(entry["url"]),
                     "also_see": entry["also_see"],
                 }
-                seen[key] = merged
-                entries.append(merged)
+                seen[key] = existing
+                entries.append(existing)
+            if cat["name"] not in existing["categories"]:
+                existing["categories"].append(cat["name"])
+            if group_name not in existing["groups"]:
+                existing["groups"].append(group_name)
+            subcat = entry["subcategory"]
+            if subcat:
+                scoped = f"{cat['name']} > {subcat}"
+                if not any(s["value"] == scoped for s in existing["subcategories"]):
+                    existing["subcategories"].append({"name": subcat, "value": scoped})
     return entries