What is the LSST's plan to address frequent satellite trails in data?
Has a plan or strategy been outlined or established to reduce the number of bright satellite trails that appear in LSST perpetual sky surveys, and/or to process images to remove the trails or at least flag pixel regions that contain likely trails?


Indeed LSST will be very affected by satellites in LEO. The strategy is to make several observations of the same area to have enought data to cover for the regions photobombed by the satellites and the artifacts generated by them in the sensor.

From the LSST webpage:


  The first group of Starlink satellites are sufficiently bright during dawn and dusk (when LSST would be surveying) that the trail would exceed sensor saturation, generating uncorrectable artifacts in the data. If instead these satellites were painted flat black making them a factor of 25 fainter, satellite trails should be less of a challenge for LSST due to its specific design.In that case LSST's frequent imaging of the same region of sky will provide enough data to correct for unsaturated satellite trails or other anomalies.