Function sql_escape_formatter 

pub fn sql_escape_formatter(
    out: &mut Output<'_>,
    state: &State<'_, '_>,
    value: &Value,
) -> Result<(), Error>

Custom formatter that escapes values for safe PostgreSQL interpolation.

This formatter is invoked when auto-escape is enabled (for .sql templates). It delegates to format_value_for_postgres for type-specific handling.

Bypass Mechanisms

• Values marked as safe (via |safe filter) are output without escaping
• Only applies when state.auto_escape() matches our custom format