Write parser sites about real estate

You need to write a parser of real estate sites with the possibility of adding new sites to the parser by the administrator himself. The parser must collect data, bring them to a single style and format, place pictures in certain ways, and save the data in a certain database table. No matter how many sites are in the database, so many threads for parsing should be launched. A parser must be able to work with a proxy. There should be no duplicate in the database. Parsing is required by 27 parameters, each parameter will be stored by a separate field in the database.