PHP data extraction crawler and mysql database append, h24

. I need a crawler reading a website, extracting data I need, and saving these data to a mysql database, according to tables and rules I specify. . The crawler must run on my php hosting server, whose configuration I will specify (any further clarification must be asked by bidder, no use if the app runs only on another server, I need it to work on mine, as well as db mysql). . The crawler must run h24, autorestarting and keeping the process up, (a second triggering server is available, if needed). Data must be read continuously, at quite a fast rhytm (once per minute or so), compared with saved data, and if new data are present they must be appended to database under a format we will agree. . This is an ongoing project: I have many sites I need to extract data from, each will be a paid module, so the total earning of coder can get relevant, as time goes by. . Pls try to figure out all info you need before starting, and to ask all possible questions. . Paolo