implement alternative match-making approach with Lua scripts in Redis

main-server/config/database.yml

@@ -10,15 +10,25 @@ default: &default
   timeout: 5000
 
 development:
-  <<: *default
-  database: storage/development.sqlite3
+  primary:
+    <<: *default
+    database: storage/development.sqlite3
+  queue:
+    <<: *default
+    database: storage/development_queue.sqlite3
+    migrations_paths: db/queue_migrate
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".
 # Do not set this db to the same as development or production.
 test:
-  <<: *default
-  database: storage/test.sqlite3
+  primary:
+    <<: *default
+    database: storage/test.sqlite3
+  queue:
+    <<: *default
+    database: storage/test_queue.sqlite3
+    migrations_paths: db/queue_migrate
 
 # PostgreSQL for production.
 #
@@ -29,11 +39,22 @@ test:
 #   DB_NAME, DB_USER, DB_PASSWORD, DB_HOST, DB_PORT
 #
 production:
-  adapter: postgresql
-  encoding: unicode
-  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
-  database: <%= ENV["DB_NAME"] %>
-  username: <%= ENV["DB_USER"] %>
-  password: <%= ENV["DB_PASSWORD"] %>
-  host: <%= ENV["DB_HOST"] %>
-  port: <%= ENV["DB_PORT"] || 5432 %>
+  primary:
+    adapter: postgresql
+    encoding: unicode
+    pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+    database: <%= ENV["DB_NAME"] %>
+    username: <%= ENV["DB_USER"] %>
+    password: <%= ENV["DB_PASSWORD"] %>
+    host: <%= ENV["DB_HOST"] %>
+    port: <%= ENV["DB_PORT"] || 5432 %>
+  queue:
+    adapter: postgresql
+    encoding: unicode
+    pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+    database: <%= ENV["QUEUE_DB_NAME"] || ENV["DB_NAME"] %>
+    username: <%= ENV["QUEUE_DB_USER"] || ENV["DB_USER"] %>
+    password: <%= ENV["QUEUE_DB_PASSWORD"] || ENV["DB_PASSWORD"] %>
+    host: <%= ENV["QUEUE_DB_HOST"] || ENV["DB_HOST"] %>
+    port: <%= ENV["QUEUE_DB_PORT"] || ENV["DB_PORT"] || 5432 %>
+    migrations_paths: db/queue_migrate