1e8f4a189b1ad69e1cc4d60177b74ab1fd249da9
markd
  Fri Oct 2 22:22:36 2026 -0700
Record that previousPred has been deleted. refs #35528

367 GB of un-negated minus-strand predictions, kept while the negated files went
through QA. Deleting them loses nothing recoverable: negation is its own
inverse, so an original comes back by running proCapNetPredToFixedStep --negate
over the file now in pred/.

diff --git src/hg/makeDb/doc/hs1/transcriptionStart.txt src/hg/makeDb/doc/hs1/transcriptionStart.txt
index 628bcd0c8c0..9f5b959ee8b 100644
--- src/hg/makeDb/doc/hs1/transcriptionStart.txt
+++ src/hg/makeDb/doc/hs1/transcriptionStart.txt
@@ -59,32 +59,34 @@
 # files were rewritten with negated values rather than rebuilt from the
 # downloads, which had already been deleted:
 #
 #   for db in hg38 hs1 ; do
 #       base=/hive/data/genomes/$db/bed/proCapNet
 #       mkdir -p $base/previousPred
 #       ls $base/pred/*.neg.bw | while read f ; do
 #           ~/kent/src/hg/makeDb/outside/proCapNet/proCapNetPredToFixedStep \
 #               --negate /hive/data/genomes/$db/chrom.sizes $f $base/negated/$(basename $f)
 #       done
 #   done
 #
 # Each output was checked against its input: same nBasesCovered, value range
 # mirrored, sampled values exactly negated.  The originals were then moved to
 # previousPred/ and the negated files put in their place, so /gbdb needs no new
-# symlinks.  previousPred/ is about 197 GB and can be removed once the track has
-# been through QA.  A rebuild from the downloads does not need any of this:
+# symlinks.  previousPred/ has since been deleted, 367 GB over the two
+# assemblies.  Nothing is lost by that: negation is its own inverse, so the
+# originals can be recovered from the files in pred/ by running the same command
+# again.  A rebuild from the downloads does not need any of this either:
 # proCapNetPredBuild negates the minus strand itself.
 
 cd ~/kent/src/hg/makeDb/outside/proCapNet
 ./proCapNetTrackDb hs1 proCapNetExperiments.tsv \
     ~/kent/src/hg/makeDb/trackDb/human/hs1/transcriptionStart.ra
 
 # transcriptionStart.ra is generated; the include line in human/hs1/trackDb.ra
 # is added by hand:
 #   include transcriptionStart.ra alpha
 
 # hs1 is a curated hub assembly, so the stanzas reach the browser through the
 # hub built under /gbdb/hs1/hubs/$USER by the trackDb make, and are visible only
 # when curatedHubPrefix in the sandbox hg.conf names that directory.
 
 # the downloads are only needed for the re-encoding