Add the "Code" Cycle Analytics section.

1. Record the `wip_flag_first_removed_at` and
   `first_assigned_to_user_other_than_author` metrics for a merge
   request. Use a `merge_request_metrics` table, similar to the one for
   `issues`. Metrics are recorded `after_save`.

2. Move larger queries to a `CycleAnalytics::Queries` module.

2 files changed, 48 insertions, 1 deletions

diff --git a/db/migrate/20160825052008_add_table_merge_request_metrics.rb b/db/migrate/20160825052008_add_table_merge_request_metrics.rb
new file mode 100644
index 00000000000..5745175ec25
--- /dev/null
+++ b/db/migrate/20160825052008_add_table_merge_request_metrics.rb
@@ -0,0 +1,36 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddTableMergeRequestMetrics < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  # disable_ddl_transaction!
+
+  def change
+    create_table :merge_request_metrics do |t|
+      t.references :merge_request, index: { name: "index_merge_request_metrics" }, foreign_key: true, null: false
+
+      t.datetime 'wip_flag_first_removed_at'
+      t.datetime 'first_assigned_to_user_other_than_author'
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 2c580a164bd..e2004dcd4bc 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160824124900) do
+ActiveRecord::Schema.define(version: 20160825052008) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -605,6 +605,16 @@ ActiveRecord::Schema.define(version: 20160824124900) do
 
   add_index "merge_request_diffs", ["merge_request_id"], name: "index_merge_request_diffs_on_merge_request_id", using: :btree
 
+  create_table "merge_request_metrics", force: :cascade do |t|
+    t.integer  "merge_request_id",                         null: false
+    t.datetime "wip_flag_first_removed_at"
+    t.datetime "first_assigned_to_user_other_than_author"
+    t.datetime "created_at",                               null: false
+    t.datetime "updated_at",                               null: false
+  end
+
+  add_index "merge_request_metrics", ["merge_request_id"], name: "index_merge_request_metrics", using: :btree
+
   create_table "merge_requests", force: :cascade do |t|
     t.string   "target_branch",                                null: false
     t.string   "source_branch",                                null: false
@@ -1163,6 +1173,7 @@ ActiveRecord::Schema.define(version: 20160824124900) do
   add_foreign_key "issue_metrics", "issues"
   add_foreign_key "lists", "boards"
   add_foreign_key "lists", "labels"
+  add_foreign_key "merge_request_metrics", "merge_requests"
   add_foreign_key "personal_access_tokens", "users"
   add_foreign_key "protected_branch_merge_access_levels", "protected_branches"
   add_foreign_key "protected_branch_push_access_levels", "protected_branches"