feat: Add JWT-based authentication, authorization, and database connection pooling.

Author: zerox80

backend/src/auth.rs

@@ -33,6 +33,7 @@ use chrono::{Duration, Utc};
 use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
+use std::collections::HashSet;
 use std::env;
 
 use crate::db::{self, DbPool};

backend/src/db.rs

@@ -988,7 +988,7 @@ async fn insert_default_tutorials_tx(
         .execute(&mut **tx)
         .await?;
 
-        replace_tutorial_topics_tx(tx, id, &topics_vec).await?;
+        crate::repositories::tutorials::replace_tutorial_topics_tx(tx, id, &topics_vec).await?;
     }
 
     Ok(())