A previous attempt at the SQL below failed. Produce a FIXED version of the
SQL that addresses the error, against the same schema. Output the same strict
JSON object as before.

# Dialect
{dialect}

# Schema
{schema_block}

# Original question
{question}

# Previous SQL (failed)
{previous_sql}

# Error context
{error_context}

# Output contract — strict JSON, no prose around it
{{
  "sql": "<corrected {dialect} SELECT statement, no trailing semicolon>",
  "rationale": "<one sentence: what you changed and why it should fix the error>",
  "tables_used": ["<table>", "..."],
  "confidence": <float in [0, 1]>
}}

Rules:
- Do NOT repeat the same mistake; reread the error.
- Stay within the schema; do not invent tables or columns.
- If you cannot fix the issue, return the safest minimal SELECT that returns
  an empty result and set `confidence` to 0.