Constant SCHEMA_V4 

pub const SCHEMA_V4: &str = "
    CREATE TABLE IF NOT EXISTS ai_governance_events (
        id          INTEGER PRIMARY KEY AUTOINCREMENT,
        ts_ms       INTEGER NOT NULL,
        consumer    TEXT NOT NULL,
        team        TEXT NOT NULL DEFAULT '',
        model       TEXT NOT NULL,
        verdict     TEXT NOT NULL,
        reason      TEXT NOT NULL DEFAULT ''
    );
    CREATE INDEX IF NOT EXISTS idx_ai_governance_ts ON ai_governance_events(ts_ms);
    CREATE INDEX IF NOT EXISTS idx_ai_governance_consumer ON ai_governance_events(consumer);
";

Schema v4 (DW-084): the ai_governance_events table. One row per governance check outcome (allow or deny) when the audit switch is on, plus every DENIAL even when the audit switch is off (the done-when requirement: a blocked attempt appears in the audit log). The admin /analytics/governance-audit endpoint reads these rows for shadow review.