Add database index for newsletter subscriber queries

[hman38705]

Issue 106: Add database index for newsletter subscriber queries

Area: Backend
Priority: Medium
Files: services/api/database/migrations/

Problem

Newsletter subscriber queries may lack indexes. Queries slow down as subscriber count grows.

Acceptance Criteria

• Indexes are added for email and status columns\n- Query plans are verified\n- Migration adds indexes without locking\n- Query performance is benchmarked

[Osuochasam]

@Osuochasam has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

let me work on this issue

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[Vivian-04]

@Vivian-04 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hiiiiiii, I would love to work on this for you 😊

I can add database indexes for newsletter subscriber queries on email and status fields, verify query plans for performance improvements, and ensure the migration runs safely without locking issues. I will also benchmark query performance after optimization.

ETA: 1 - 2hours

Kindly assign this to me…Thank youuu!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Vivian-04 to this issue.

[famvilianity-eng]

@famvilianity-eng has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

i can add this function i am familiar with this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @famvilianity-eng to this issue.

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Congratulations, @famvilianity-eng! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @famvilianity-eng as part of the Stellar Wave Program's 4th Wave 🥳

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