try

moviedb_func.py

@@ -98,7 +98,8 @@ def create_movie_database(db_name="movie_db.db"):
         medium_id integer not null,
         release_year integer,
         user_id integer not null,
-        FOREIGN KEY (user_id) REFERENCES user (id)
+        FOREIGN KEY (user_id) REFERENCES user (id),
+        UNIQUE(titel, user_id)
     )
     """
 
@@ -271,7 +272,7 @@ def scrape_and_add_movie(movie_name: str, medium_id: int, user_id: int, db_name:
         with DBcm.UseDatabase(db_name) as db:
             db.execute(SQL_PARAM, (movie_name.lower(), genre_id,
                        regie_id, medium_id, release_year, user_id,))
-    except ProgrammingError as e:
+    except (ProgrammingError, sqlite3.IntegrityError) as e:
         print(f"Error adding movie: {e}")
         return False
     return True
@@ -288,8 +289,8 @@ def add_manual_movie(movie_name: str, medium_id: int, director_name: str, releas
     try:
         with DBcm.UseDatabase(db_name) as db:
             db.execute(SQL_PARAM, (movie_name.lower(), genre_id,
-                       regie_id, medium_id, release_year, user_id,))
-    except ProgrammingError as e:
+                       regie_id, medium_id, release_year, user_id,)) 
+    except (ProgrammingError, sqlite3.IntegrityError) as e:
         print(f"Error adding movie: {e}")
         return False
     return True