perf: add composite indexes on PaymentIntent and Transaction

[bigmeec14]

Overview

This PR optimizes Prisma schema query performance by adding composite indexes on heavily filtered fields used across admin and merchant dashboards. The new @@index directives on PaymentIntent and Transaction cover common status + date style WHERE clause combinations, eliminating full table scans and speeding up filtered list views.

Related Issue

Changes

🗄️ Composite Index Optimization

• [ADD] prisma/schema.prisma

  • Add @@index([status, createdAt]) to PaymentIntent.
  • Add @@index([status, createdAt]) to Transaction.
  • Covers common dashboard filters such as status + createdAt.

• [ADD] prisma/migrations/20260901000000_add_composite_indexes/migration.sql

  • Generated migration that creates composite indexes on both models.

• [MODIFY] PaymentIntent and Transaction model definitions

  • Add composite index directives for heavily filtered fields.

Verification Results

npx prisma migrate diff --from-migrations prisma/migrations --to-schema-datamodel prisma/schema.prisma
✅ No drift detected

EXPLAIN SELECT * FROM "PaymentIntent" WHERE status = 'requires_payment_method' AND "createdAt" >= now() - interval '7 days';
✅ Index Scan using "PaymentIntent_status_createdAt_idx"

EXPLAIN SELECT * FROM "Transaction" WHERE status = 'pending' AND "createdAt" >= '2026-01-01';
✅ Index Scan using "Transaction_status_createdAt_idx"

Acceptance Criteria	Status
Composite indexes added to PaymentIntent and Transaction	✅ @@index([status, createdAt]) added to both Prisma models
Migration generated	✅ 20260901000000_add_composite_indexes/migration.sql created
Explain plan verifies index usage	✅ Index scans confirmed for status + createdAt queries

Closes #509

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