[2.9.0] Rename plugin to compound-engineering

BREAKING: Plugin renamed from compounding-engineering to compound-engineering.
Users will need to reinstall with the new name:

  claude /plugin install compound-engineering

Changes:
- Renamed plugin directory and all references
- Updated documentation counts (24 agents, 19 commands)
- Added julik-frontend-races-reviewer to docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/compound-engineering/skills/andrew-kane-gem-writer/references/database-adapters.md

@@ -0,0 +1,231 @@
+# Database Adapter Patterns
+
+## Abstract Base Class Pattern
+
+```ruby
+# lib/strong_migrations/adapters/abstract_adapter.rb
+module StrongMigrations
+  module Adapters
+    class AbstractAdapter
+      def initialize(checker)
+        @checker = checker
+      end
+
+      def min_version
+        nil
+      end
+
+      def set_statement_timeout(timeout)
+        # no-op by default
+      end
+
+      def check_lock_timeout
+        # no-op by default
+      end
+
+      private
+
+      def connection
+        @checker.send(:connection)
+      end
+
+      def quote(value)
+        connection.quote(value)
+      end
+    end
+  end
+end
+```
+
+## PostgreSQL Adapter
+
+```ruby
+# lib/strong_migrations/adapters/postgresql_adapter.rb
+module StrongMigrations
+  module Adapters
+    class PostgreSQLAdapter < AbstractAdapter
+      def min_version
+        "12"
+      end
+
+      def set_statement_timeout(timeout)
+        select_all("SET statement_timeout = #{timeout.to_i * 1000}")
+      end
+
+      def set_lock_timeout(timeout)
+        select_all("SET lock_timeout = #{timeout.to_i * 1000}")
+      end
+
+      def check_lock_timeout
+        lock_timeout = connection.select_value("SHOW lock_timeout")
+        lock_timeout_sec = timeout_to_sec(lock_timeout)
+        # validation logic
+      end
+
+      private
+
+      def select_all(sql)
+        connection.select_all(sql)
+      end
+
+      def timeout_to_sec(timeout)
+        units = {"us" => 1e-6, "ms" => 1e-3, "s" => 1, "min" => 60}
+        timeout.to_f * (units[timeout.gsub(/\d+/, "")] || 1e-3)
+      end
+    end
+  end
+end
+```
+
+## MySQL Adapter
+
+```ruby
+# lib/strong_migrations/adapters/mysql_adapter.rb
+module StrongMigrations
+  module Adapters
+    class MySQLAdapter < AbstractAdapter
+      def min_version
+        "8.0"
+      end
+
+      def set_statement_timeout(timeout)
+        select_all("SET max_execution_time = #{timeout.to_i * 1000}")
+      end
+
+      def check_lock_timeout
+        lock_timeout = connection.select_value("SELECT @@lock_wait_timeout")
+        # validation logic
+      end
+    end
+  end
+end
+```
+
+## MariaDB Adapter (MySQL variant)
+
+```ruby
+# lib/strong_migrations/adapters/mariadb_adapter.rb
+module StrongMigrations
+  module Adapters
+    class MariaDBAdapter < MySQLAdapter
+      def min_version
+        "10.5"
+      end
+
+      # Override MySQL-specific behavior
+      def set_statement_timeout(timeout)
+        select_all("SET max_statement_time = #{timeout.to_i}")
+      end
+    end
+  end
+end
+```
+
+## Adapter Detection Pattern
+
+Use regex matching on adapter name:
+
+```ruby
+def adapter
+  @adapter ||= case connection.adapter_name
+    when /postg/i
+      Adapters::PostgreSQLAdapter.new(self)
+    when /mysql|trilogy/i
+      if connection.try(:mariadb?)
+        Adapters::MariaDBAdapter.new(self)
+      else
+        Adapters::MySQLAdapter.new(self)
+      end
+    when /sqlite/i
+      Adapters::SQLiteAdapter.new(self)
+    else
+      Adapters::AbstractAdapter.new(self)
+    end
+end
+```
+
+## Multi-Database Support (PgHero pattern)
+
+```ruby
+module PgHero
+  class << self
+    attr_accessor :databases
+  end
+
+  self.databases = {}
+
+  def self.primary_database
+    databases.values.first
+  end
+
+  def self.capture_query_stats(database: nil)
+    db = database ? databases[database] : primary_database
+    db.capture_query_stats
+  end
+
+  class Database
+    attr_reader :id, :config
+
+    def initialize(id, config)
+      @id = id
+      @config = config
+    end
+
+    def connection_model
+      @connection_model ||= begin
+        Class.new(ActiveRecord::Base) do
+          self.abstract_class = true
+        end.tap do |model|
+          model.establish_connection(config)
+        end
+      end
+    end
+
+    def connection
+      connection_model.connection
+    end
+  end
+end
+```
+
+## Connection Switching
+
+```ruby
+def with_connection(database_name)
+  db = databases[database_name.to_s]
+  raise Error, "Unknown database: #{database_name}" unless db
+
+  yield db.connection
+end
+
+# Usage
+PgHero.with_connection(:replica) do |conn|
+  conn.execute("SELECT * FROM users")
+end
+```
+
+## SQL Dialect Handling
+
+```ruby
+def quote_column(column)
+  case adapter_name
+  when /postg/i
+    %("#{column}")
+  when /mysql/i
+    "`#{column}`"
+  else
+    column
+  end
+end
+
+def boolean_value(value)
+  case adapter_name
+  when /postg/i
+    value ? "true" : "false"
+  when /mysql/i
+    value ? "1" : "0"
+  else
+    value.to_s
+  end
+end
+```