diff --git a/resources/sql/patches/102.heraldcleanup.php b/resources/sql/patches/102.heraldcleanup.php
index 5b885bd670..f7f58131ea 100644
--- a/resources/sql/patches/102.heraldcleanup.php
+++ b/resources/sql/patches/102.heraldcleanup.php
@@ -1,39 +1,8 @@
 <?php
 
-echo pht('Cleaning up old Herald rule applied rows...')."\n";
-$table = new HeraldRule();
-$table->openTransaction();
-$table->beginReadLocking();
+// Once, this migration deleted some unnecessary rows written by Herald before
+// January 2012. These rows don't hurt anything, they just cluttered up the
+// database a bit.
 
-$rules = $table->loadAll();
-foreach ($rules as $key => $rule) {
-  $first_policy = HeraldRepetitionPolicyConfig::toInt(
-    HeraldRepetitionPolicyConfig::FIRST);
-  if ($rule->getRepetitionPolicy() != $first_policy) {
-    unset($rules[$key]);
-  }
-}
-
-$conn_w = $table->establishConnection('w');
-
-$clause = '';
-if ($rules) {
-  $clause = qsprintf(
-    $conn_w,
-    'WHERE ruleID NOT IN (%Ld)',
-    mpull($rules, 'getID'));
-}
-
-echo pht('This may take a moment')."\n";
-do {
-  queryfx(
-    $conn_w,
-    'DELETE FROM %T %Q LIMIT 1000',
-    HeraldRule::TABLE_RULE_APPLIED,
-    $clause);
-  echo '.';
-} while ($conn_w->getAffectedRows());
-
-$table->endReadLocking();
-$table->saveTransaction();
-echo "\n".pht('Done.')."\n";
+// The migration was removed in January 2018 to make maintenance on rule
+// repetition policies easier.