diff --git a/resources/sql/autopatches/20150504.symbolsproject.1.php b/resources/sql/autopatches/20150504.symbolsproject.1.php
index 037397998b..018724e259 100644
--- a/resources/sql/autopatches/20150504.symbolsproject.1.php
+++ b/resources/sql/autopatches/20150504.symbolsproject.1.php
@@ -1,82 +1,7 @@
 <?php
 
-$table_w = new PhabricatorRepository();
-$conn_w = $table_w->establishConnection('w');
-
-// Repository and Project share a database.
-$conn_r = $table_w->establishConnection('r');
-$projects_table = 'repository_arcanistproject';
-
-$raw_projects_data = queryfx_all($conn_r, 'SELECT * FROM %T', $projects_table);
-$raw_projects_data = ipull($raw_projects_data, null, 'id');
-
-$repository_ids = ipull($raw_projects_data, 'repositoryID');
-if (!$repository_ids) {
-  return;
-}
-
-$repositories = id(new PhabricatorRepositoryQuery())
-  ->setViewer(PhabricatorUser::getOmnipotentUser())
-  ->withIDs($repository_ids)
-  ->execute();
-
-$projects_to_repo_ids_map = ipull($raw_projects_data, 'repositoryID', 'phid');
-$projects_to_repos_map = array();
-foreach ($projects_to_repo_ids_map as $projectPHID => $repositoryID) {
-  $repo = idx($repositories, $repositoryID);
-  if ($repo) {
-    $projects_to_repos_map[$projectPHID] = $repo->getPHID();
-  }
-}
-
-foreach ($raw_projects_data as $project_row) {
-  $repositoryID = idx($project_row, 'repositoryID');
-  $repo = idx($repositories, $repositoryID);
-
-  if (!$repo) {
-    continue;
-  }
-
-  echo pht(
-    "Migrating symbols configuration for '%s' project...\n",
-    idx($project_row, 'name', '???'));
-
-  $symbol_index_projects = $project_row['symbolIndexProjects'];
-  $symbol_index_projects = nonempty($symbol_index_projects, '[]');
-  try {
-    $symbol_index_projects = phutil_json_decode($symbol_index_projects);
-  } catch (PhutilJSONParserException $ex) {
-    continue;
-  }
-
-  $sources = $repo->getDetail('symbol-sources', array());
-  foreach ($symbol_index_projects as $index_project) {
-    $sources[] = idx($projects_to_repos_map, $index_project);
-  }
-  $sources = array_filter($sources);
-  $sources = array_unique($sources);
-
-  $repo->setDetail('symbol-sources', $sources);
-
-  $languages = $project_row['symbolIndexLanguages'];
-  $languages = nonempty($languages, '[]');
-  try {
-    $languages = phutil_json_decode($languages);
-  } catch (PhutilJSONParserException $ex) {
-    continue;
-  }
-
-  $languages = array_merge(
-    $repo->getDetail('symbol-languages', array()),
-    $languages);
-  $languages = array_unique($languages);
-
-  $repo->setDetail('symbol-languages', $languages);
-
-  queryfx(
-    $conn_w,
-    'UPDATE %T SET details = %s WHERE id = %d',
-    $table_w->getTableName(),
-    json_encode($repo->getDetails()),
-    $repo->getID());
-}
+// NOTE: This migration moved existing symbol configuration from Arcanist
+// Projects to Repositories. Like "20150503.repositorysymbols.2.php", it stopped
+// running cleanly about two months later, after Spaces were introduced. Since
+// this data is easy to rebuild, just stop running the migration. See T8691 and
+// T8697.