Schema Fields information

{"name": "fid", "type": "int", "doc": "Filter ID (1=g; 2=R; 3=i)"}, {"name": "pid", "type": "long", "doc": "Processing ID for science image to facilitate archive retrieval"}, {"name": "diffmaglim", "type": ["float", "null"], "default": null, "doc": "Expected 5-sigma mag limit in difference image based on global noise estimate [mag]"}, {"name": "pdiffimfilename", "type": ["string", "null"], "default": null, "doc": "filename of positive (sci minus ref) difference image"}, {"name": "programpi", "type": ["string", "null"], "default": null, "doc": "Principal investigator attached to program ID"}, {"name": "programid", "type": "int", "doc": "Program ID: encodes either public, collab, or caltech mode"}, {"name": "candid", "type": "long", "doc": "Candidate ID from operations DB"}, {"name": "isdiffpos", "type": "string", "doc": "t or 1 => candidate is from positive (sci minus ref) subtraction; f or 0 => candidate is from negative (ref minus sci) subtraction"}, {"name": "tblid", "type": ["long", "null"], "default": null, "doc": "Internal pipeline table extraction ID"}, {"name": "nid", "type": ["int", "null"], "default": null, "doc": "Night ID"}, {"name": "rcid", "type": ["int", "null"], "default": null, "doc": "Readout channel ID [00 .. 63]"}, {"name": "field", "type": ["int", "null"], "default": null, "doc": "ZTF field ID"},