perf: 合并 insert_weather_data N+1 查询为单次；添加 Docker 内存限制和磁盘告警

src/db.rs

@@ -9,15 +9,36 @@ use crate::error::AppError;
 
 // 用于插入weather_data的数据
 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_active_member = user.is_member && user.membership_expires_at.is_none_or(|expires| expires > Utc::now());
+    // 单次查询获取用户会员状态和数据条数（原 N+1：get_user_by_id + count_user_weather_data → 合并为 1 次）
+    #[derive(FromRow)]
+    struct UserQuota {
+        is_member: bool,
+        paid_expires_at: Option<chrono::DateTime<Utc>>,
+        data_count: i64,
+    }
+
+    let quota = sqlx::query_as::<_, UserQuota>(
+        r#"
+        SELECT
+            u.is_member,
+            u.paid_expires_at,
+            (SELECT COUNT(*) FROM weather_data w WHERE w.user_id = $1)::BIGINT AS data_count
+        FROM users u
+        WHERE u.id = $1
+        "#,
+    )
+    .bind(user_id)
+    .fetch_optional(pool)
+    .await
+    .map_err(|e| AppError::Database(format!("查询用户配额失败: {}", e)))?
+    .ok_or_else(|| AppError::NotFound("用户不存在".to_string()))?;
+
+    let is_active_member = quota.is_member && quota.paid_expires_at.is_none_or(|expires| expires > Utc::now());
 
     // 维护模式：非会员使用更高的临时限额，防止资源滥用
     let is_maintenance = std::env::var("PAYMENT_MAINTENANCE_MODE").ok() == Some("true".to_string());
 
     if !is_active_member {
-        let current_count = count_user_weather_data(pool, user_id).await?;
         let limit: i64 = if is_maintenance {
             env::var("MAINTENANCE_MODE_DATA_LIMIT")
                 .unwrap_or_else(|_| "500".to_string())
@@ -30,7 +51,7 @@ pub async fn insert_weather_data(pool: &PgPool, weather_data: &WeatherData, user
                 .unwrap_or(20)
         };
         
-        if current_count >= limit {
+        if quota.data_count >= limit {
             return Err(AppError::Forbidden("数据条数已达上限，请升级为付费用户".to_string()));
         }
     }