Switch to postgres in prod

config/database.yml

@@ -37,8 +37,10 @@ test:
 # is mounted as a persistent Docker volume in config/deploy.yml.
 production:
   primary:
-    <<: *default
-    database: storage/production.sqlite3
+    adapter: postgresql
+    encoding: unicode
+    pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+    url: <%= ENV['DATABASE_URL'] %>
   wakatime:
     adapter: postgresql
     encoding: unicode