Use DB for auth sessions (#1233)

* DB sessions

* Validations for profile image

db/migrate/20241003163448_create_sessions.rb

@@ -0,0 +1,13 @@
+class CreateSessions < ActiveRecord::Migration[7.2]
+  def change
+    create_table :sessions, id: :uuid do |t|
+      t.references :user, null: false, foreign_key: true, type: :uuid
+      t.string :user_agent
+      t.string :ip_address
+
+      t.timestamps
+    end
+
+    remove_column :users, :last_login_at, :datetime
+  end
+end