refactor: store timestamps as i64 nanoseconds instead of DateTime<Utc>

Author: reddevilmidzy

src/file_manager/handlers.rs

@@ -54,7 +54,9 @@ pub async fn upload_file(
             .into_response();
     }
 
-    let now = Utc::now();
+    let now = Utc::now()
+        .timestamp_nanos_opt()
+        .expect("Failed to get timestamp");
     let language = match Language::from_filename(&filename) {
         Ok(lang) => lang,
         Err(e) => {

src/file_manager/models.rs

@@ -1,6 +1,5 @@
 use crate::errors::LanguageError;
 
-use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use std::{collections::HashMap, sync::LazyLock};
 
@@ -11,8 +10,8 @@ pub struct FileMetadata {
     pub language: Language,
     pub category: String,
     pub size: u64,
-    pub created_at: DateTime<Utc>,
-    pub updated_at: DateTime<Utc>,
+    pub created_at: i64,
+    pub updated_at: i64,
 }
 
 #[derive(Debug, Deserialize)]