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moreminimore-chat/db
Vishnu Narayanan 1e33bfd553 fix: add if_not_exists to conversations.created_at index migration (#15214)
## Description

Follow-up to #15147. The migration missed `if_not_exists`, so it fails
with `index already exists` on a re-run or when the index is pre-built.
Makes it idempotent, matching recent concurrent-index migrations.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
2026-07-28 16:21:25 +05:30
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