What made you to knock-off all the entries in RSTSODS table? Was it happened accidentally or intentionally? You have actually cleared all PSAs in one shot. The best way is to do extraction agaoin from the source.
Please make plan now, from which date on wards you want to load? You can run repair full loads by mentioning the dates in data slection tab of your infopackages. Check whether all your init request are available under scheduler menu in all infopackages. If your init got corrupted, you need to run init without transfer for all infopackages and start running repair full loads. Hence your subsequent DTPs will run smoothly..
If you do still require the data, you can just extract it by creating a generic DataSource in the Myself source system in PSA /BIC/B0001467, version 000.
You can find the technical name of the PSA table in the table RSTSODS with the specified PSA name and version.
Convert the data using a separate transformation into the new target format.
This will be very tedious job. In regular job, we don't do like this, although a pop up message given by SAP. Don't divert by reading this, as the chances of getting back data is again a big question mark even if you follow the suggestion.
Regards,
Suman