feat: implement time based message sweep on user ban (#670)

* feat: implement time based message sweep on user ban
- Adds `delete_message_seconds` (0 to 7 days in seconds) to the ban request payload.

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: pass ulid conversion to database

Signed-off-by: arsabutispik <ispik@ispik.dev>

* fix: use COL constant instead of hardcoded string in error mapper

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: broadcast bulk delete events during ban sweep

Updates the `delete_messages_by_author_since` trait to return a
HashMap of deleted message IDs grouped by channel.

The MongoDB implementation now uses a two-step process: it first
runs a projected `find` query to gather the target `_id` and
`channel` fields, then executes the `delete_many` operation.
This allows the ban route to loop through the affected channels and
dispatch `EventV1::BulkMessageDelete` WebSocket events, ensuring
that the swept messages are instantly removed from the UI for
all connected clients.

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: optimize message deletion by using $group and aggregate

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: use with_type in query

Signed-off-by: arsabutispik <ispik@ispik.dev>

* refactor: abstract function to Message model and mark attachments as deleted

Signed-off-by: arsabutispik <ispik@ispik.dev>

---------

Signed-off-by: arsabutispik <ispik@ispik.dev>

crates/delta/src/routes/servers/ban_create.rs

@@ -4,13 +4,16 @@ use revolt_database::{
         get_user_voice_channel_in_server, remove_user_from_voice_channel, UserVoiceChannel,
         VoiceClient,
     },
-    Database, RemovalIntention, ServerBan, User,
+    Database, Message, RemovalIntention, ServerBan, User,
 };
 use revolt_models::v0;
+use std::time::{Duration, SystemTime};
 
+use revolt_database::events::client::EventV1;
 use revolt_permissions::{calculate_server_permissions, ChannelPermission};
 use revolt_result::{create_error, Result};
 use rocket::{serde::json::Json, State};
+use ulid::Ulid;
 use validator::Validate;
 
 /// # Ban User
@@ -73,7 +76,15 @@ pub async fn ban(
             .await?;
         }
     }
+    // We do this outside the member check so we can sweep hit-and-run spammers who already left.
+    if let Some(seconds) = data.delete_message_seconds {
+        if seconds > 0 {
+            let threshold_time = SystemTime::now() - Duration::from_secs(seconds as u64);
 
+            Message::bulk_delete_by_author_since(db, &server.channels, target.id, threshold_time)
+                .await?;
+        }
+    }
     ServerBan::create(db, &server, target.id, data.reason)
         .await
         .map(Into::into)