add some migrations

db/migrate/20190825013330_remove_genesis_content_from_blockchains.rb

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+class RemoveGenesisContentFromBlockchains < ActiveRecord::Migration
+  def up
+    remove_column :blockchains, :genesis_content
+  end
+
+  def down
+    add_column :blockchains, :genesis_content, :text
+  end
+end

db/migrate/20190825013437_remove_network_id_from_blockchains.rb

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+class RemoveNetworkIdFromBlockchains < ActiveRecord::Migration
+  def up
+    remove_column :blockchains, :network_id
+  end
+
+  def down
+    add_column :blockchains, :network_id, :integer
+  end
+end

db/migrate/20190825013525_remove_connect_ip_from_blockchains.rb

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+class RemoveConnectIpFromBlockchains < ActiveRecord::Migration
+  def up
+    remove_column :blockchains, :connect_ip
+  end
+
+  def down
+    add_column :blockchains, :connect_ip, :integer
+  end
+end

db/migrate/20190825013616_remove_port_from_blockchains.rb

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+class RemovePortFromBlockchains < ActiveRecord::Migration
+  def up
+    remove_column :blockchains, :port
+  end
+
+  def down
+    add_column :blockchains, :port, :integer
+  end
+end

db/migrate/20190825013743_remove_enode_from_blockchains.rb

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+class RemoveEnodeFromBlockchains < ActiveRecord::Migration
+  def up
+    remove_column :blockchains, :enode
+  end
+
+  def down
+    add_column :blockchains, :enode, :string
+  end
+end