|  | class CreateBlocks < ActiveRecord::Migration[5.0]
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							|  |   def change
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							|  |     create_table :blocks do |t|
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							|  |       t.integer :account_id, null: false
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							|  |       t.integer :target_account_id, null: false
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							|  | 
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							|  |       t.timestamps null: false
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							|  |     end
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							|  | 
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							|  |     add_index :blocks, [:account_id, :target_account_id], unique: true
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							|  |   end
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							|  | end
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