Migrate to Postgresql for better network handling. Add more user functionality.

Gemfile

@@ -4,8 +4,11 @@ source "https://rubygems.org"
 gem "rails", "~> 8.1.1"
 # The modern asset pipeline for Rails [https://github.com/rails/propshaft]
 gem "propshaft"
-# Use sqlite3 as the database for Active Record
+# Use sqlite3 as the database for Active Record (for cache/queue/cable)
 gem "sqlite3", ">= 2.1"
+
+# Use PostgreSQL as the primary database
+gem "pg", ">= 1.1"
 # Use the Puma web server [https://github.com/puma/puma]
 gem "puma", ">= 5.0"
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
@@ -56,6 +59,9 @@ gem "maxmind-db"
 # HTTP client for database downloads
 gem "httparty"
 
+# Authorization library
+gem "pundit"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"