{
    "action": "tool_call",
    "reasoning": "Confirm row count, key uniqueness, and the ingestion timestamp range as a first grounding step.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS row_count, COUNT(DISTINCT Student_ID) AS distinct_students, MIN(_ingestion_timestamp) AS first_ingested, MAX(_ingestion_timestamp) AS last_ingested, COUNT(DISTINCT _batch_id) AS batches FROM raw.Social_media_impact_on_life",
        "purpose": "Confirm row count and check the only true timestamp column's range",
        "source": "raw"
    }
}