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GroupService Group Buying System: Redis Optimistic Lock + BullMQ Settlement Queue

JoyMini's group buying system is based on Redis optimistic locking to prevent overselling and a BullMQ settlement queue for asynchronous profit distribution, covering the complete transactional flow of group creation, joining, automatic group formation, and settlement.

Interface Management

IM Chat & Contact/Group Architecture – Message Engine + Session Management + Group Permissions + Friend Relationship Full Chain

In-depth analysis of the client-side IM instant messaging system: from Message Meta-First Engine, SeqId Cursor Pagination, EventEmitter² Event Decoupling, to Group Management (Kick/Mute/Promote-Demote/Transfer/Dismiss), Friend Relationships (Apply/Process/Search State Machine), Group Join Request Approval Workflow, and WebRTC ICE Server Dynamic Credential Generation, covering 900+ lines of ChatService full source code.

Management Backend