chore: API improvements (#3637)

- Unique validations for Inbox members and Team member objects
- Move notification processing to Async

db/migrate/20211221125545_add_unique_index_on_inbox_members.rb

@@ -0,0 +1,19 @@
+# ref: https://dev.to/nodefiend/rails-migration-adding-a-unique-index-and-deleting-duplicates-5cde
+
+class AddUniqueIndexOnInboxMembers < ActiveRecord::Migration[6.1]
+  def up
+    # partioning the duplicate records and then removing where more than one row is found
+    ActiveRecord::Base.connection.execute('
+      DELETE FROM inbox_members WHERE id IN (SELECT id from (
+        SELECT id, user_id, inbox_id, ROW_NUMBER() OVER w AS rnum FROM inbox_members WINDOW w AS (
+          PARTITION BY inbox_id, user_id ORDER BY id
+        )
+      ) t WHERE t.rnum > 1)
+    ')
+    add_index :inbox_members, [:inbox_id, :user_id], unique: true
+  end
+
+  def down
+    remove_index :inbox_members, [:inbox_id, :user_id]
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_12_19_031453) do
+ActiveRecord::Schema.define(version: 2021_12_21_125545) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -429,6 +429,7 @@ ActiveRecord::Schema.define(version: 2021_12_19_031453) do
     t.integer "inbox_id", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["inbox_id", "user_id"], name: "index_inbox_members_on_inbox_id_and_user_id", unique: true
     t.index ["inbox_id"], name: "index_inbox_members_on_inbox_id"
   end