Database Transaction Middleware for Data Integrity

[phertyameen]

Labels: middleware, database, reliability, high-priority

Description:

Implement transaction management middleware to ensure database operations are atomic, consistent, isolated, and durable (ACID).

Requirements:

• Automatically wrap database operations in transactions
• Support transaction isolation levels (READ COMMITTED, REPEATABLE READ)
• Commit transactions on successful request completion
• Rollback transactions on errors or exceptions
• Handle nested transactions (savepoints)
• Prevent deadlocks with timeout mechanisms
• Support read-only transactions for query optimization
• Allow manual transaction control when needed
• Integrate with TypeORM transaction management
• Log transaction conflicts and rollbacks
• Support distributed transactions for future microservices

Acceptance Criteria:

• Database operations within request are transactional by default
• Failed requests result in complete rollback (no partial updates)
• Successful requests commit all changes atomically
• Deadlocks detected and resolved gracefully
• Transaction timeouts prevent indefinite locks
• Read-only endpoints use read-only transactions for performance
• Complex operations (multi-table updates) maintain consistency
• Error handling includes transaction cleanup
• No connection leaks from uncommitted transactions
• Transaction metrics logged for performance monitoring

Transaction Scenarios:

• Puzzle submission: Update user progress, XP, streak, daily quest (all or nothing)
• User registration: Create user, create streak record, send welcome email
• Points claiming: Update user XP, create transaction record, check achievements
• Friend request: Create relationship, send notification, update both user stats

Isolation Levels:

READ COMMITTED: Default for most operations
REPEATABLE READ: For critical financial-like operations
SERIALIZABLE: For leaderboard updates and competitions

Rollback Triggers:

• Validation errors
• Database constraint violations
• Business logic errors
• External API failures (when critical)
• Timeout exceeded

Edge Cases:

• Transaction timeout handling
• Deadlock resolution
• Nested transaction conflicts
• Connection pool exhaustion

[mijinummi]

@mijinummi has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I would like to work on this task

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

[drips-wave]

Congratulations, @mijinummi! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @mijinummi: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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