Text-to-SQL demos are easy. Production is not. This report shows how to move from a plausible query to a trusted business answer across complex schemas, private definitions, access rules, and cost limits.
Column names rarely encode metric definitions, exclusions, fiscal calendars, or approved joins. Production systems need semantic context and verified examples.
A syntactically valid query can be logically wrong. Evaluate result equivalence, policy compliance, cost, latency, and explanation quality.
The user should see only rows, columns, and metrics they are entitled to access. The model cannot be trusted to enforce policy through instruction alone.
Start with one business area where metrics and joins are governed. Create a semantic layer, glossary, examples, and approved query patterns.
Select relevant tables, columns, definitions, policy, and verified queries. Keep the model focused on the smallest sufficient context.
Use identity-aware access, query parsing, allowlists, cost limits, row limits, dry runs, sandboxing, and post-execution checks. Guardrails should exist outside the model.
Capture questions, clarifications, generated SQL, execution, corrections, and accepted answers. Use failures to expand the evaluation suite and semantic context.
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