SchemaSentry

SchemaSentry is a web app (with optional CLI) that monitors production data tables and event streams for schema drift and breaking changes, then alerts the right owner with a clear diff and blast radius. It connects to common warehouses (Snowflake, BigQuery, Postgres) and message/event sources, snapshots schemas and key stats daily, and detects risky changes like dropped columns, type changes, null-rate spikes, or renamed fields. Instead of generic alerts, it maps downstream dependencies (dbt models, BI dashboards, and key queries) to estimate impact and suggest safe fixes (e.g., add nullable column, backfill, create view for compatibility). It’s not a full data observability suite; it’s a focused “schema guardrail” that small-to-mid data teams can deploy quickly without a six-figure contract. Pricing is per environment and number of monitored assets.