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sql-sentinel

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Audit SQL for the cost & performance anti-patterns that burn warehouse credits. Scores warehouse health 0-100 and outputs a prioritized cost-reduction plan for BigQuery, Snowflake, Redshift, and Postgres.

When to use

• A user writes or reviews a query for BigQuery, Snowflake, Redshift, Postgres, or Spark SQL.
• A user asks "why is this query so slow?" or "why is my warehouse bill so high?"
• A user is about to promote a dashboard query or dbt model to production.
• A data engineer wants a second pair of eyes before a code review or a cost-optimization sweep.
• A team is running a "reduce cloud spend" or FinOps initiative.

When not to use

• This is a **static** analyzer. It finds anti-patterns in the *text* of SQL; it does not read query plans, row counts, or billing. A flagged query on a 100-row table is cheap; the same query on a billion-row table is the problem the rule ex…
• The fact-table heuristic (SQL015) keys off table *names* (`*_events`, `*_log`) and is advisory, not definitive.
• It does not execute SQL — safe to run on any `.sql` file.

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