Allow not delete triggers

lib/lhm.rb

@@ -55,7 +55,7 @@ def sync_table(table_name, sync_table, options = {}, &block)
     origin = Table.parse(table_name, connection)
     invoker = Invoker.new(origin, connection)
     block.call(invoker.migrator)
-    options.merge!({disable_switcher: true})
+    options.merge!({disable_switcher: true, delete_trigger_after: false})
     invoker.run(options)
   ensure
     Lhm::Table.naming_strategy = nil

lib/lhm/entangler.rb

@@ -9,15 +9,16 @@ class Entangler
     include Command
     include SqlHelper
 
-    attr_reader :connection
+    attr_reader :connection, :delete_trigger_after
 
     # Creates entanglement between two tables. All creates, updates and deletes
     # to origin will be repeated on the destination table.
-    def initialize(migration, connection = nil)
+    def initialize(migration, connection = nil, delete_trigger_after = true)
       @intersection = migration.intersection
       @origin = migration.origin
       @destination = migration.destination
       @connection = connection
+      @delete_trigger_after = delete_trigger_after
     end
 
     def entangle
@@ -85,6 +86,7 @@ def before
     end
 
     def after
+      return unless @delete_trigger_after
       untangle.each do |stmt|
         @connection.execute(tagged(stmt))
       end

lib/lhm/invoker.rb

@@ -42,7 +42,7 @@ def run(options = {})
       set_session_lock_wait_timeouts
       migration = @migrator.run
 
-      Entangler.new(migration, @connection).run do
+      Entangler.new(migration, @connection, options[:delete_trigger_after] && true).run do
         Chunker.new(migration, @connection, options).run
         if options[:disable_switcher]
           Lhm.logger.debug 'switcher is disabled'