Not sure if this is related to recent changes or just a cache I need to drop, just writing it down so I don't lose it:
[2015-06-19 15:34:50] EXCEPTION: (AphrontDuplicateKeyQueryException) #1062: Duplicate entry 'TZDRQHD7vIWs' for key 'identityHash' at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:299] arcanist(head=master, ref.master=f06eea0d8484), phabricator(head=redesign-2015, ref.master=0fd0f171f10f, ref.redesign-2015=7d7e13d79b86), phutil(head=master, ref.master=81eed10bea57) #0 AphrontBaseMySQLDatabaseConnection::throwQueryCodeException(integer, string) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:275] #1 AphrontBaseMySQLDatabaseConnection::throwQueryException(mysqli) called at [<phutil>/src/aphront/storage/connection/mysql/AphrontBaseMySQLDatabaseConnection.php:181] #2 AphrontBaseMySQLDatabaseConnection::executeRawQuery(string) called at [<phutil>/src/xsprintf/queryfx.php:6] #3 queryfx(AphrontMySQLiDatabaseConnection, string, string, string, array, string) #4 call_user_func_array(string, array) called at [<phutil>/src/aphront/storage/connection/AphrontDatabaseConnection.php:28] #5 AphrontDatabaseConnection::query(string, string, string, array, string) called at [<phabricator>/src/infrastructure/storage/lisk/LiskDAO.php:1261] #6 LiskDAO::insertRecordIntoDatabase(string) called at [<phabricator>/src/infrastructure/storage/lisk/LiskDAO.php:1106] #7 LiskDAO::insert() called at [<phabricator>/src/infrastructure/storage/lisk/LiskDAO.php:1075] #8 LiskDAO::save() called at [<phabricator>/src/applications/diviner/storage/DivinerLiveSymbol.php:168] #9 DivinerLiveSymbol::save() called at [<phabricator>/src/applications/diviner/publisher/DivinerLivePublisher.php:148] #10 DivinerLivePublisher::createDocumentsByHash(array) called at [<phabricator>/src/applications/diviner/publisher/DivinerPublisher.php:151] #11 DivinerPublisher::publishAtoms(array) called at [<phabricator>/src/applications/diviner/workflow/DivinerGenerateWorkflow.php:583] #12 DivinerGenerateWorkflow::publishDocumentation(boolean, DivinerLivePublisher) called at [<phabricator>/src/applications/diviner/workflow/DivinerGenerateWorkflow.php:213] #13 DivinerGenerateWorkflow::generateBook(string, PhutilArgumentParser) called at [<phabricator>/src/applications/diviner/workflow/DivinerGenerateWorkflow.php:80] #14 DivinerGenerateWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406] #15 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301] #16 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/diviner/diviner.php:21]