Database migrations for protected tags

Added schema.rb for protected tags
Removed unnecessary table ‘protected_tag_merge_access_levels’
Fixed timestamps on protected_tags

db/migrate/20170309173138_create_protected_tags.rb

+class CreateProtectedTags < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  GITLAB_ACCESS_MASTER = 40
+
+  def change
+    create_table :protected_tags do |t|
+      t.integer :project_id, null: false
+      t.string :name, null: false
+      t.timestamps null: false
+    end
+
+    add_index :protected_tags, :project_id
+
+    create_table :protected_tag_push_access_levels do |t|
+      t.references :protected_tag, index: { name: "index_protected_tag_push_access" }, foreign_key: true, null: false
+      t.integer :access_level, default: GITLAB_ACCESS_MASTER, null: true
+      t.references :user, foreign_key: true, index: true
+      t.integer :group_id#TODO: Should this have an index? Doesn't appear in brances #, index: true
+      t.timestamps null: false
+    end
+
+    add_foreign_key :protected_tag_push_access_levels, :namespaces, column: :group_id # rubocop: disable Migration/AddConcurrentForeignKey
+  end
+end

db/schema.rb

@@ -1124,6 +1124,27 @@ ActiveRecord::Schema.define(version: 20170402231018) do
 
   add_index "protected_branches", ["project_id"], name: "index_protected_branches_on_project_id", using: :btree
 
+  create_table "protected_tag_push_access_levels", force: :cascade do |t|
+    t.integer "protected_tag_id", null: false
+    t.integer "access_level", default: 40
+    t.integer "user_id"
+    t.integer "group_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "protected_tag_push_access_levels", ["protected_tag_id"], name: "index_protected_tag_push_access", using: :btree
+  add_index "protected_tag_push_access_levels", ["user_id"], name: "index_protected_tag_push_access_levels_on_user_id", using: :btree
+
+  create_table "protected_tags", force: :cascade do |t|
+    t.integer "project_id", null: false
+    t.string "name", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  add_index "protected_tags", ["project_id"], name: "index_protected_tags_on_project_id", using: :btree
+
   create_table "push_rules", force: :cascade do |t|
     t.string "force_push_regex"
     t.string "delete_branch_regex"
@@ -1525,6 +1546,9 @@ ActiveRecord::Schema.define(version: 20170402231018) do
   add_foreign_key "protected_branch_push_access_levels", "namespaces", column: "group_id"
   add_foreign_key "protected_branch_push_access_levels", "protected_branches"
   add_foreign_key "protected_branch_push_access_levels", "users"
+  add_foreign_key "protected_tag_push_access_levels", "namespaces", column: "group_id"
+  add_foreign_key "protected_tag_push_access_levels", "protected_tags"
+  add_foreign_key "protected_tag_push_access_levels", "users"
   add_foreign_key "remote_mirrors", "projects"
   add_foreign_key "subscriptions", "projects", on_delete: :cascade
   add_foreign_key "system_note_metadata", "notes", name: "fk_d83a918cb1", on_delete: :cascade