feat: implement rate limiting, detailed health check, bookmarks, and …

[xeladev4]

Description

This PR implements four major feature additions across the backend architecture addressing Rate Limiting, Health Monitoring, User Market Bookmarks, and Leaderboard Smart Contract robustness natively targeting multiple open issues.

Resolves

Closes #434
Closes #436
Closes #442
Closes #497

Changes Made

• Rate Limit Status: Implemented RateLimitService parsing current @nestjs/throttler context to generate accurate user statuses via GET /auth/rate-limit. Exposes total quota limits, remaining requests, and reset timers.
• Detailed Health Check: Added the GET /health/detailed endpoint executing comprehensive connectivity pings to the internal TypeORM Data Source, caches, and live Soroban RPC endpoints yielding total uptime_seconds.
• Market Bookmarking: Created the UserBookmark entity tying Users to Favorite Markets alongside generation of the explicit CreateUserBookmarksTable Migration maintaining delete: cascade integrity.
• Bookmark Controllers: Exposed POST /markets/:id/bookmark allowing bookmark creation, DELETE /markets/:id/bookmark for removal, and GET /users/me/bookmarks providing paginated access to starred records.
• Leaderboard Testing: Added the integration test test_update_leaderboard_empty_entries to the core Rust definitions (contract/tests/leaderboard_tests.rs) preventing out-of-bounds calculations upon leaderboard state resets.

Testing & Quality Assurance

• Backend local suite passes cleanly (All 205 specs via pnpm run test).
• Reconfigured Mock Environments inside existing tests resolving dependency breakages for UserBookMark repositories and RateLimitStatus implementations.
• ESLint validation processes complete successfully across backend/src.
• Contract cargo test execution passed confirming leaderboard logic enhancements.

Dependencies Updated

• None

Additional Guidance

• Since this PR merges UserBookmark structural generation schema, please run your migrations locally on your next boot via pnpm run typeorm migration:run.

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Project	Deployment	Actions	Updated (UTC)
insight-arena-4rll	Ready	Preview, Comment	Mar 30, 2026 2:58am

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