fix: 修复多处代码质量问题-移除unwrap/println/dead-code/重复代码/错误吞咽

src/db.rs

@@ -11,7 +11,7 @@ use crate::error::AppError;
 pub async fn insert_weather_data(pool: &PgPool, weather_data: &WeatherData, user_id: i32) -> Result<i32, AppError> {
     // 配额检查：非付费用户数据条数限制
     let user = get_user_by_id(pool, user_id).await?;
-    let is_paid_active = user.is_paid && (user.paid_expires_at.is_none() || user.paid_expires_at.unwrap() > Utc::now());
+    let is_paid_active = user.is_paid && user.paid_expires_at.map_or(true, |expires| expires > Utc::now());
     
     if !is_paid_active {
         let current_count = count_user_weather_data(pool, user_id).await?;
@@ -490,8 +490,7 @@ pub async fn get_user_quota(
 ) -> Result<(i64, bool, Option<chrono::DateTime<chrono::Utc>>), AppError> {
     let user = get_user_by_id(pool, user_id).await?;
     let is_paid_active = user.is_paid
-        && (user.paid_expires_at.is_none()
-            || user.paid_expires_at.unwrap() > chrono::Utc::now());
+        && user.paid_expires_at.map_or(true, |expires| expires > chrono::Utc::now());
     let used = count_user_weather_data(pool, user_id).await?;
     Ok((used, is_paid_active, user.paid_expires_at))
 }