add users query command, initial fsck admin command

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/service/admin/query/users.rs

@@ -0,0 +1,25 @@
+use ruma::events::room::message::RoomMessageEventContent;
+
+use super::Users;
+use crate::{services, Result};
+
+/// All the getters and iterators in key_value/users.rs
+pub(super) async fn users(subcommand: Users) -> Result<RoomMessageEventContent> {
+	match subcommand {
+		Users::Iter => {
+			let timer = tokio::time::Instant::now();
+			let results = services().users.db.iter();
+			let query_time = timer.elapsed();
+
+			let users = results.collect::<Vec<_>>();
+
+			Ok(RoomMessageEventContent::text_html(
+				format!("Query completed in {query_time:?}:\n\n```\n{:?}```", users),
+				format!(
+					"<p>Query completed in {query_time:?}:</p>\n<pre><code>{:?}\n</code></pre>",
+					users
+				),
+			))
+		},
+	}
+}