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diff --git a/resources/sql/autopatches/20170320.reviewers.03.migrate.php b/resources/sql/autopatches/20170320.reviewers.03.migrate.php
new file mode 100644
index 0000000000..04abb5c141
--- /dev/null
+++ b/resources/sql/autopatches/20170320.reviewers.03.migrate.php
@@ -0,0 +1,125 @@
+<?php
+
+$table = new DifferentialRevision();
+$diff_table = new DifferentialDiff();
+$reviewer_table = new DifferentialReviewer();
+
+$table_name = PhabricatorEdgeConfig::TABLE_NAME_EDGE;
+$data_name = PhabricatorEdgeConfig::TABLE_NAME_EDGEDATA;
+
+$conn = $table->establishConnection('w');
+
+// Previously "DifferentialRevisionHasReviewerEdgeType::EDGECONST".
+$edge_type = 35;
+
+// NOTE: We can't use normal migration iterators for edges because they don't
+// have an "id" column. For now, try just loading the whole result set: the
+// actual size of the rows is small. If we run into issues, we could write an
+// EdgeIterator.
+$every_edge = queryfx_all(
+ $conn,
+ 'SELECT * FROM %T edge LEFT JOIN %T data ON edge.dataID = data.id
+ WHERE edge.type = %d',
+ $table_name,
+ $data_name,
+ $edge_type);
+
+foreach ($every_edge as $edge) {
+ if ($edge['type'] != $edge_type) {
+ // Ignore edges which aren't "reviewers", like subscribers.
+ continue;
+ }
+
+ try {
+ $data = phutil_json_decode($edge['data']);
+ $data = idx($data, 'data');
+ } catch (Exception $ex) {
+ // Just ignore any kind of issue with the edge data, we'll use a default
+ // below.
+ $data = null;
+ }
+
+ if (!$data) {
+ $data = array(
+ 'status' => 'added',
+ );
+ }
+
+ $status = idx($data, 'status');
+
+ $diff_phid = null;
+
+ // NOTE: At one point, the code to populate "diffID" worked correctly, but
+ // it seems to have later been broken. Salvage it if we can, and look up
+ // the corresponding diff PHID.
+ $diff_id = idx($data, 'diffID');
+ if ($diff_id) {
+ $row = queryfx_one(
+ $conn,
+ 'SELECT phid FROM %T WHERE id = %d',
+ $diff_table->getTableName(),
+ $diff_id);
+ if ($row) {
+ $diff_phid = $row['phid'];
+ }
+ }
+
+ if (!$diff_phid) {
+ // If the status is "accepted" or "rejected", look up the current diff
+ // PHID so we can distinguish between "accepted" and "accepted older".
+ switch ($status) {
+ case 'accepted':
+ case 'rejected':
+ case 'commented':
+ $row = queryfx_one(
+ $conn,
+ 'SELECT diff.phid FROM %T diff JOIN %T revision
+ ON diff.revisionID = revision.id
+ WHERE revision.phid = %s
+ ORDER BY diff.id DESC LIMIT 1',
+ $diff_table->getTableName(),
+ $table->getTableName(),
+ $edge['src']);
+ if ($row) {
+ $diff_phid = $row['phid'];
+ }
+ break;
+ }
+ }
+
+ // We now represent some states (like "Commented" and "Accepted Older") as
+ // a primary state plus an extra flag, instead of making "Commented" a
+ // primary state. Map old states to new states and flags.
+
+ if ($status == 'commented') {
+ $status = 'added';
+ $comment_phid = $diff_phid;
+ $action_phid = null;
+ } else {
+ $comment_phid = null;
+ $action_phid = $diff_phid;
+ }
+
+ if ($status == 'accepted-older') {
+ $status = 'accepted';
+ }
+
+ if ($status == 'rejected-older') {
+ $status = 'rejected';
+ }
+
+ queryfx(
+ $conn,
+ 'INSERT INTO %T (revisionPHID, reviewerPHID, reviewerStatus,
+ lastActionDiffPHID, lastCommentDiffPHID, dateCreated, dateModified)
+ VALUES (%s, %s, %s, %ns, %ns, %d, %d)
+ ON DUPLICATE KEY UPDATE dateCreated = VALUES(dateCreated)',
+ $reviewer_table->getTableName(),
+ $edge['src'],
+ $edge['dst'],
+ $status,
+ $action_phid,
+ $comment_phid,
+ $edge['dateCreated'],
+ $edge['dateCreated']);
+}

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