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862430e586
MeasurementsController#index orders by taken_at desc; without an index this scan grows linearly with the readout count. The composite index on (user_id, taken_at) covers both the implicit user_id filter from the association scope and the ORDER BY clause. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
7 lines
175 B
Ruby
7 lines
175 B
Ruby
class AddTakenAtToReadouts < ActiveRecord::Migration[7.2]
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def change
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add_column :readouts, :taken_at, :datetime
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add_index :readouts, [:user_id, :taken_at]
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end
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end
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