Function insert_validated 

pub fn insert_validated(
    conn: &Connection,
    name: &str,
    namespace: &str,
    memory_type: &str,
    description: Option<&str>,
    body: &[u8],
    body_hash: &str,
    entities_json: Option<&str>,
    relationships_json: Option<&str>,
) -> Result<i64, AppError>

Inserts a new entry into pending_memories with status validated.

Returns the generated pending_id.