// STUDI KASUS REKAYASA SISTEMIdempotent Ledger

Moderator Panel Billing & Top-Up

Developed a package top-up feature and automated migration scripts for a moderator panel, improving billing accuracy and operational efficiency.

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Moderator Panel — Billing & Top-UpHand-drawn flow showing legacy billing data migrated into a normalized schema, admin top-ups that adjust client quotas, and downstream reporting.// FIG.04 — MODERATOR PANEL · BILLINGMIGRATION · TOP-UPLEGACYOld Schemamigrate[01] CORERails Billingtop-ups · quotasADMINTop-Up Actiontop-upwrite[02] STATEPostgreSQLaccounts · ledgerDOWNSTREAMReporting
Fig. 04 — Moderator Panel: legacy billing data is migrated into a normalized schema, top-ups adjust client quotas, and the ledger flows into downstream reporting.