fix: forget unbanned rejoin

crates/rustmail/src/db/operations/banned_users.rs

@@ -237,6 +237,23 @@ pub async fn save_banned_user(user: &BannedUser, pool: &SqlitePool) -> ModmailRe
     Ok(())
 }
 
+pub async fn delete_banned_user(
+    guild_id: &str,
+    user_id: &str,
+    pool: &SqlitePool,
+) -> ModmailResult<()> {
+    sqlx::query("DELETE FROM banned_users WHERE guild_id = ? AND user_id = ?")
+        .bind(guild_id)
+        .bind(user_id)
+        .execute(pool)
+        .await
+        .map_err(|e| {
+            eprintln!("Failed to delete banned user: {e:?}");
+            validation_failed("Failed to delete banned user")
+        })?;
+    Ok(())
+}
+
 pub async fn get_banned_user_by_id(
     guild_id: &str,
     user_id: &str,

crates/rustmail/src/handlers/guild_ban_handler.rs

@@ -89,6 +89,19 @@ impl EventHandler for GuildBanHandler {
             return;
         };
         record_member(pool, &new_member).await;
+
+        if let Err(e) = delete_banned_user(
+            &new_member.guild_id.to_string(),
+            &new_member.user.id.to_string(),
+            pool,
+        )
+        .await
+        {
+            eprintln!(
+                "Failed to forget banned user {} after rejoining guild {}: {:?}",
+                new_member.user.id, new_member.guild_id, e
+            );
+        }
     }
 
     async fn guild_member_update(