Add env variable to disable prepared statements (#1293)

.env.production.sample

@@ -63,3 +63,7 @@ SMTP_FROM_ADDRESS=notifications@example.com
 
 # Streaming API integration
 # STREAMING_API_BASE_URL=
+
+# Advanced settings
+# If you need to use pgBouncer, you need to disable prepared statements:
+# PREPARED_STATEMENTS=false

config/database.yml

@@ -22,3 +22,4 @@ production:
   password: <%= ENV['DB_PASS'] || '' %>
   host: <%= ENV['DB_HOST'] || 'localhost' %>
   port: <%= ENV['DB_PORT'] || 5432 %>
+  prepared_statements: <%= ENV['PREPARED_STATEMENTS'] || 'true' %>