chore: Search optimisations (#6644)

- Strip search term before searching
- order messages by created_at desc
- order contacts by last_activity_at desc
- order conversations by created_at desc
- Search only resolved contacts
- Optimize resolved contacts query

ref: #6583

app/models/contact.rb

@@ -136,9 +136,7 @@ class Contact < ApplicationRecord
   end
 
   def self.resolved_contacts
-    where.not(email: [nil, '']).or(
-      Current.account.contacts.where.not(phone_number: [nil, ''])
-    ).or(Current.account.contacts.where.not(identifier: [nil, '']))
+    where("COALESCE(NULLIF(contacts.email,''),NULLIF(contacts.phone_number,''),NULLIF(contacts.identifier,'')) IS NOT NULL")
   end
 
   def discard_invalid_attrs

app/models/installation_config.rb

@@ -24,6 +24,8 @@ class InstallationConfig < ApplicationRecord
   before_validation :set_lock
   validates :name, presence: true
 
+  # TODO: Get rid of default scope
+  # https://stackoverflow.com/a/1834250/939299
   default_scope { order(created_at: :desc) }
   scope :editable, -> { where(locked: false) }
 

app/models/message.rb

@@ -81,6 +81,10 @@ class Message < ApplicationRecord
   scope :chat, -> { where.not(message_type: :activity).where(private: false) }
   scope :non_activity_messages, -> { where.not(message_type: :activity).reorder('id desc') }
   scope :today, -> { where("date_trunc('day', created_at) = ?", Date.current) }
+
+  # TODO: Get rid of default scope
+  # https://stackoverflow.com/a/1834250/939299
+  # if you want to change order, use `reorder`
   default_scope { order(created_at: :asc) }
 
   belongs_to :account

app/models/notification.rb

@@ -42,6 +42,8 @@ class Notification < ApplicationRecord
 
   after_create_commit :process_notification_delivery, :dispatch_create_event
 
+  # TODO: Get rid of default scope
+  # https://stackoverflow.com/a/1834250/939299
   default_scope { order(id: :desc) }
 
   PRIMARY_ACTORS = ['Conversation'].freeze