Add Comments to Countdown

Summary: 3, 2, 1, Liftoff! (Adds basic commenting to countdown)

Test Plan: asdf asdf asdf

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8895

Differential Revision: https://secure.phabricator.com/D13707

resources/sql/autopatches/20150724.countdown.comments.1.sql

@@ -0,0 +1,18 @@
+CREATE TABLE {$NAMESPACE}_countdown.countdown_transaction_comment (
+  id INT UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  phid VARCHAR(64) NOT NULL,
+  transactionPHID VARCHAR(64),
+  authorPHID VARCHAR(64) NOT NULL,
+  viewPolicy VARCHAR(64) NOT NULL,
+  editPolicy VARCHAR(64) NOT NULL,
+  commentVersion INT UNSIGNED NOT NULL,
+  content LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
+  contentSource LONGTEXT NOT NULL COLLATE {$COLLATE_TEXT},
+  isDeleted BOOL NOT NULL,
+  dateCreated INT UNSIGNED NOT NULL,
+  dateModified INT UNSIGNED NOT NULL,
+
+  UNIQUE KEY `key_phid` (phid),
+  UNIQUE KEY `key_version` (transactionPHID, commentVersion)
+
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};