feat(db): optimize schema with performance indexes and constraints

[kryputh]

Description

This Pull Request addresses issue #42 by reviewing and optimizing the schema.prisma file. The changes focus on improving query performance and ensuring data integrity through the addition of strategic indexes and the removal of redundant ones.

Changes

• User Model: Removed redundant index on walletAddress (already covered by @unique).
• Session Model:
  • Removed redundant index on token.
  • Added indexes on expiresAt and a composite index on [userId, expiresAt] to optimize session cleanup and validation.
• Position Model:
  • Added indexes on status and [userId, status] for faster filtering of active/closed positions.
  • Added a composite index on [protocolName, assetSymbol] and a single index on assetSymbol for protocol-based queries.
• Transaction Model:
  • Removed redundant index on txHash.
  • Added indexes on type, status, createdAt, and [userId, createdAt] to accelerate historical transaction lookups and dashboard analytics.
• AgentLog Model: Added indexes on status and [userId, status] to improve agent performance monitoring.
• ProcessedEvent Model: Added an index on ledger for faster blockchain event tracking.

Integrity & Performance

• All new indexes are non-breaking and do not modify existing data structures.
• Redundant indexes were removed to reduce storage overhead and improve write latency on frequently updated tables like users and sessions.
• A new migration file 20260425140000_add_performance_indexes has been generated containing the corresponding SQL.

Verification

• prisma generate was executed successfully to update the Prisma Client.
• The schema was validated for consistency.

Closes #42

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[robertocarlous]

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[robertocarlous]

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