Better explain the REDIS_DB and REDIS_DB_FOR_RESQUE config vars

config/deploy_targets/common.rb

@@ -23,6 +23,8 @@ def self.common_options
       db_password: "",
       redis_host: "localhost",
       redis_port: 6379,
+      redis_db: 0,
+      redis_db_for_resque: 1,
       # This can be a comma-separated list of OPENID providers.
       openid_providers: "https://www.google.com/accounts/o8/ud",
       # This hostname is used when generating URLs to commits in emails.

environment.rb

@@ -17,8 +17,10 @@
 
 REDIS_HOST = "localhost"
 REDIS_PORT = 6379
-REDIS_DB   = 0
-RESQUE_DB  = 1
+
+# These Redis databases are used by Barkeep for caching and Resque jobs. Redis uses integers for DB names.
+REDIS_DB = 0
+REDIS_DB_FOR_RESQUE = 1
 
 # A comma-separate list of OpenID provider URLs for signing in your users.
 # If you provide more than one, users will receive a UI allowing to pick which service to use to authenticate.

lib/script_environment.rb

@@ -17,8 +17,7 @@
 require "lib/redis_manager"
 require "backtrace_shortener"
 
-Resque.redis = Redis.new(:host => REDIS_HOST, :port => REDIS_PORT,
-                         :db => RESQUE_DB)
+Resque.redis = Redis.new(:host => REDIS_HOST, :port => REDIS_PORT, :db => REDIS_DB_FOR_RESQUE)
 
 # Make the developer experience better by shortening backtraces.
 BacktraceShortener.monkey_patch_the_exception_class! unless ENV["RACK_ENV"] == "production"