Add a GC for sent and received mail

Summary: Ref T4368. We don't currently GC these tables, and the sent mail table is one of the largest on `secure.phabricator.com`. There's no value in retaining this information indefinitely. Instead, retain it for 90 days, which should be plenty of time to debug/diagnose any issues.

Test Plan: Ran `phd debug garbage`, saw it clean up a reasonable amount of data from these tables.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T4368

Differential Revision: https://secure.phabricator.com/D8127

resources/sql/autopatches/20140201.gc.1.mailsent.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_metamta.metamta_mail
+  ADD KEY `key_created` (dateCreated);

resources/sql/autopatches/20140201.gc.2.mailreceived.sql

@@ -0,0 +1,2 @@
+ALTER TABLE {$NAMESPACE}_metamta.metamta_receivedmail
+  ADD KEY `key_created` (dateCreated);

src/__phutil_library_map__.php

@@ -923,6 +923,8 @@ phutil_register_library_map(array(
     'ManiphestTransactionSaveController' => 'applications/maniphest/controller/ManiphestTransactionSaveController.php',
     'ManiphestView' => 'applications/maniphest/view/ManiphestView.php',
     'MetaMTAConstants' => 'applications/metamta/constants/MetaMTAConstants.php',
+    'MetaMTAMailReceivedGarbageCollector' => 'applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php',
+    'MetaMTAMailSentGarbageCollector' => 'applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php',
     'MetaMTANotificationType' => 'applications/metamta/constants/MetaMTANotificationType.php',
     'MetaMTAReceivedMailStatus' => 'applications/metamta/constants/MetaMTAReceivedMailStatus.php',
     'NuanceCapabilitySourceDefaultEdit' => 'applications/nuance/capability/NuanceCapabilitySourceDefaultEdit.php',
@@ -3513,6 +3515,8 @@ phutil_register_library_map(array(
     'ManiphestTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
     'ManiphestTransactionSaveController' => 'ManiphestController',
     'ManiphestView' => 'AphrontView',
+    'MetaMTAMailReceivedGarbageCollector' => 'PhabricatorGarbageCollector',
+    'MetaMTAMailSentGarbageCollector' => 'PhabricatorGarbageCollector',
     'MetaMTANotificationType' => 'MetaMTAConstants',
     'MetaMTAReceivedMailStatus' => 'MetaMTAConstants',
     'NuanceCapabilitySourceDefaultEdit' => 'PhabricatorPolicyCapability',

src/applications/metamta/garbagecollector/MetaMTAMailReceivedGarbageCollector.php

@@ -0,0 +1,21 @@
+<?php
+
+final class MetaMTAMailReceivedGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $ttl = phutil_units('90 days in seconds');
+
+    $table = new PhabricatorMetaMTAReceivedMail();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
+      $table->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}

src/applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php

@@ -0,0 +1,21 @@
+<?php
+
+final class MetaMTAMailSentGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $ttl = phutil_units('90 days in seconds');
+
+    $table = new PhabricatorMetaMTAMail();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE dateCreated < %d LIMIT 100',
+      $table->getTableName(),
+      time() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}