add: automatically stop all user ads when user cannot afford transfer

crates/app/src/routes/api/v1/ads.rs

@@ -17,7 +17,7 @@ use tetratto_core::model::{
 };
 use super::{CreateAd, UpdateAdIsRunning};
 
-const MAXIMUM_AD_FILE_SIZE: usize = 4_194_304;
+const MAXIMUM_AD_FILE_SIZE: usize = 2_097_152;
 
 pub async fn create_request(
     jar: CookieJar,
@@ -104,6 +104,15 @@ pub async fn update_is_running_request(
         None => return Json(Error::NotAllowed.into()),
     };
 
+    if user.coins < 50 {
+        return Json(
+            Error::MiscError(
+                "You must have a minimum of 50 coins in your balance to run ads".to_string(),
+            )
+            .into(),
+        );
+    }
+
     match data
         .update_ad_is_running(id, &user, if req.is_running { 1 } else { 0 })
         .await