You are generating synthetic tabular healthcare records for research benchmarking.

Return only a JSON array. Each array element must be a valid JSON object with exactly the requested columns.
Do not add prose, markdown, comments, or explanations.

Generation requirements:
- Produce {n_rows} rows.
- Respect the schema exactly.
- Preserve plausible relationships between columns.
- Avoid impossible or contradictory combinations.
- Do not copy memorized records.
- Use only admissible categories and realistic numeric ranges.

Table name: {table_name}

Column schema:
{schema_text}

Column constraints:
{constraint_text}

Target variable:
{target_description}

Output format example:
[
  {{"column_a": "...", "column_b": 1, "target": 0}},
  {{"column_a": "...", "column_b": 2, "target": 1}}
]
