[api] drop obsolete table bs_request_histories

should have happen with db/migrate/20140908125426_convert_request_history.rb

src/api/db/migrate/20161124135426_drop_obsolete_table.rb

@@ -0,0 +1,10 @@
+class DropObsoleteTable < ActiveRecord::Migration
+  def up
+    drop_table :bs_request_histories
+  rescue ActiveRecord::StatementInvalid
+    # just drop in case it exists, it is not used since two years
+  end
+
+  def down
+  end
+end

src/api/db/structure.sql

@@ -246,19 +246,6 @@ CREATE TABLE `bs_request_counter` (
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
 
-CREATE TABLE `bs_request_histories` (
-  `id` int(11) NOT NULL AUTO_INCREMENT,
-  `bs_request_id` int(11) DEFAULT NULL,
-  `state` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
-  `comment` text COLLATE utf8_bin,
-  `commenter` varchar(255) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
-  `superseded_by` int(11) DEFAULT NULL,
-  `created_at` datetime DEFAULT NULL,
-  PRIMARY KEY (`id`),
-  KEY `bs_request_id` (`bs_request_id`),
-  CONSTRAINT `bs_request_histories_ibfk_1` FOREIGN KEY (`bs_request_id`) REFERENCES `bs_requests` (`id`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
-
 CREATE TABLE `bs_requests` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `description` text COLLATE utf8_bin,
@@ -1113,6 +1100,6 @@ CREATE TABLE `watched_projects` (
   CONSTRAINT `watched_projects_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 
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