fix: added missing index

[themarolt]

Note

Medium Risk
Introduces a new concurrent partial index on memberIdentities, which can impact migration runtime and database load on large tables but is otherwise isolated to query performance.

Overview
Improves performance of email identity joins by adding a concurrent partial B-tree index on memberIdentities(lower(value)) scoped to verified = true, type = 'email', and non-deleted rows.

Adds the corresponding down migration to drop idx_memberIdentities_verified_email_lower_value if present.

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[Copilot]

Pull request overview

Adds a targeted B-tree partial index to speed up equality lookups on verified, non-deleted email identities (where the existing trigram GIN index is not well-suited for = predicates).

Changes:

• Add a concurrent B-tree partial index on memberIdentities(lower(value)) scoped to verified = true, type = 'email', and "deletedAt" IS NULL.
• Add an undo migration to drop the new index concurrently.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
backend/src/database/migrations/V1774363114__add-btree-index-for-member-identities-email-lookup.sql	Creates the new concurrent partial B-tree index intended for verified-email equality lookups.
backend/src/database/migrations/U1774363114__add-btree-index-for-member-identities-email-lookup.sql	Drops the newly added index concurrently for rollback/undo scenarios.

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