db: drop redundant user_id index on email_sends
The composite ix_email_sends_user_kind_sent (user_id, kind, sent_at) already satisfies leftmost-prefix WHERE user_id=? lookups on both MariaDB and SQLite, so the standalone per-column index was dead weight. Drop it before the migration ever lands in prod.
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2 changed files with 1 additions and 5 deletions
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@ -46,13 +46,9 @@ def upgrade() -> None:
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"email_sends",
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["user_id", "kind", "sent_at"],
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)
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op.create_index(
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op.f("ix_email_sends_user_id"), "email_sends", ["user_id"],
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)
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def downgrade() -> None:
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op.drop_index(op.f("ix_email_sends_user_id"), table_name="email_sends")
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op.drop_index("ix_email_sends_user_kind_sent", table_name="email_sends")
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op.drop_table("email_sends")
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op.drop_column("users", "digest_tone")
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