csml_engine 1.11.2

The CSML Engine is a conversational engine designed to make it extremely easy to create rich and powerful chatbots.
Documentation 
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use diesel::{RunQueryDsl, ExpressionMethods, QueryDsl};

use crate::{
    EngineError, SqliteClient,
};

use super::{
    schema::{
        csml_conversations,
        csml_memories, csml_states
    }
};

pub fn delete_expired_data(
    db: &SqliteClient,
) -> Result<(), EngineError> {
    let date_now = chrono::Utc::now().naive_utc();

    diesel::delete(
        csml_conversations::table
        .filter(csml_conversations::expires_at.lt(date_now))
    ).execute(&db.client).ok();

    diesel::delete(
        csml_memories::table
        .filter(csml_memories::expires_at.lt(date_now))
    ).execute(&db.client).ok();

    diesel::delete(
        csml_states::table
        .filter(csml_states::expires_at.lt(date_now))
    ).execute(&db.client).ok();

    Ok(())
}