check for doubles

main.py

@@ -13,6 +13,7 @@ import db
 import sftp as sftp_module
 import sync
 import uploader
+from uploader import delete_book, fetch_all_books, find_duplicate_groups
 
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s — %(message)s")
 log = logging.getLogger(__name__)
@@ -185,6 +186,34 @@ async def test_calibre():
     return {"ok": ok, "message": message}
 
 
+# --- Duplicates ---
+
+@app.get("/duplicates", response_class=HTMLResponse)
+async def duplicates_page(request: Request):
+    cfg = config.load()
+    error = None
+    groups: list = []
+    total_books = 0
+    try:
+        books = fetch_all_books(cfg.calibre)
+        total_books = len(books)
+        groups = find_duplicate_groups(books)
+    except Exception as e:
+        error = str(e)
+    return templates.TemplateResponse(request, "duplicates.html", {
+        "groups": groups,
+        "total_books": total_books,
+        "error": error,
+    })
+
+
+@app.post("/api/delete_book/{book_id}")
+async def delete_book_api(book_id: int):
+    cfg = config.load()
+    ok, message = delete_book(cfg.calibre, book_id)
+    return {"ok": ok, "message": message}
+
+
 # --- Data reset ---
 
 @app.post("/settings/reset-sync-data")