Service Layer high complexity backend
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Description

Backend service that computes and serves aggregate expense metrics by combining nightly-materialized snapshots with a real-time current-day delta. Executes parameterized drill-down queries using composite indexes on submitter_id, expense_type, and created_at, and evaluates statistical anomaly thresholds per organization.

Feature: Reimbursement Overview

reimbursement-analytics-service

Responsibilities

  • Serve pre-materialized nightly aggregate metrics (total claims, approved amount, avg processing time, rejection rate) per organization and time period
  • Compute real-time delta aggregation for the current day and merge with snapshot figures
  • Execute parameterized drill-down queries filtered by peer mentor, expense type, or date range with index-aware query planning
  • Detect anomalies by comparing claim counts and expense type concentrations against the organization rolling baseline (two standard deviations threshold)
  • Enforce organization scoping so each admin accesses only their own tenant data

Interfaces

getAggregateMetrics(orgId: string, period: TimePeriod): Promise<ExpenseMetrics>
getDrillDownData(orgId: string, filters: ExpenseFilters): Promise<ExpenseRecord[]>
getAnomalyFlags(orgId: string, period: TimePeriod): Promise<AnomalyFlag[]>
getRollingBaseline(orgId: string, windowDays: number): Promise<AnomalyBaseline>

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