System Architecture
Built for mathematical determinism, offline PWA resilience, and high-availability enterprise scale across distributed retail and hospitality locations.
PWA Offline Mutation Queue & Background Sync
Client-side IndexedDB persistence preserves exact offline punch timestamps across walk-in freezers and network outages.
navigator.onLine = true
Table: alkashift_offline_mutations
Progressive Web App (PWA) Offline Engine
Service Worker offline caching (Cache API) combined with client-side IndexedDB mutation queue (alkashift_offline_mutations) preserves historical punch timestamps and replays punches upon reconnection.
FastAPI & Python 3.11 Microservices
Asynchronous ASGI event loop delivering sub-50ms query response times, JWT session rotation, and Redis/ARQ task queues for heavy schedule generation jobs.
Google OR-Tools CP-SAT & Python CSP Engine
Multi-constraint optimization engine compiling complex labor regulations, overtime limits, and skill requirements into integer programming matrices.
PostgreSQL 15 & PostGIS Spatial Extensions
Native geographic geometry engine executing spatial polygon containment (ST_Contains) for tamper-proof mobile geofence boundary checks.
Bi-Directional WebSocket Real-Time Pipeline
Sub-second pub/sub WebSocket channels dispatching floor attendance telemetry, roster publications, and team chat messages across all devices.
Strict Multi-Tenant Database Isolation
100% of mutating and data-returning queries enforce org_id boundaries, verified against IDOR, privilege escalation, and cross-tenant leakage.
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