barbie-bot 862430e586 Add index on readouts(user_id, taken_at) ...

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>

2026-04-04 10:20:55 +00:00

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