#035

Purpose
To continue strengthening the reliability of the achievement system, improve consistency in player data handling, and address performance issues observed after recent stat and reward integrations.

Key Highlights

🏅 Achievement Trigger Reliability Improvements

• Further refinement applied to backend trigger conditions for achievements tied to edge scenarios (multi-round matches, rapid reconnects, partial forfeits).
• Improved sequencing of event processing to ensure achievements are awarded only after final match confirmation.

🔄 State Sync Consistency Fixes

• Resolved intermittent inconsistencies between in-session achievement unlocks and persisted backend state.
• Session-level caching adjusted to prioritize backend-confirmed state over local UI triggers.

📊 Stats Pipeline Stabilization (Phase 2)

• Reduced mismatch frequency between match results and reflected player stats.
• Improved ordering of stat write operations to prevent overwrite conflicts during high activity windows.

⚙️ Lightweight Backend Optimizations

• Selective query optimizations applied to player stats endpoints to reduce response variance.
•  Minor cleanup of redundant background jobs causing duplicate stat reconciliation attempts.

Why It Matters

• Improving achievement reliability ensures users trust progression systems and reduces confusion around unlock conditions.
• More stable stat pipelines directly impact leaderboard accuracy and competitive credibility.
• Backend optimizations help maintain performance without requiring major architectural changes—critical given current team bandwidth.

Open Issues

• Achievement delays still occur under peak concurrent match conditions (race conditions not fully eliminated).
• Stat reconciliation jobs occasionally lag behind real-time updates for high-frequency players.
• Edge-case inconsistencies remain for matches involving rapid disconnect/reconnect loops.

Fixed

• Incorrect achievement triggers during partial match terminations resolved.
• Duplicate stat write attempts reduced significantly through improved job deduplication.
• Minor UI desync where achievements briefly appeared locked after unlock corrected.

Next Steps

•  Introduce controlled retry logic for delayed achievement triggers under load.
• Continue improving stat reconciliation timing to better align with real-time gameplay.
•  Begin limited testing for expanded achievement categories (low-risk additions only).
•  Further reduce backend noise by consolidating event processing pathways.