update all commands and havent tested

PostgreSQL.py

@@ -103,5 +103,16 @@ def requete_postgres(str):
             print("Cette requête prends:", temps, "seconde")
             cursor.close()
         conn.close()
+    except (psycopg2.DatabaseError, Exception) as error:
+        print(error)
+
+def reset_database_postgres():
+    try:
+        with connect_postgres() as conn:
+            with conn.cursor() as cursor:
+                cursor.execute('DROP TABLE IF EXISTS flights,airlines,airports')
+            conn.commit()
+            cursor.close()
+        conn.close()
     except (psycopg2.DatabaseError, Exception) as error:
         print(error)