Redacted event retention, implement MSC2815

src/admin/debug/commands.rs

@@ -1023,3 +1023,19 @@ pub(super) async fn resync_database(&self) -> Result {
 		.update()
 		.map_err(|e| err!("Failed to update from primary: {e:?}"))
 }
+
+#[admin_command]
+pub(super) async fn get_retained_pdu(&self, event_id: OwnedEventId) -> Result {
+	let pdu = self
+		.services
+		.retention
+		.get_original_pdu_json(&event_id)
+		.await?;
+
+	let text = serde_json::to_string_pretty(&pdu)?;
+
+	self.write_str(&format!("Original PDU:\n```json\n{text}```"))
+		.await?;
+
+	Ok(())
+}

src/admin/debug/mod.rs

@@ -250,6 +250,11 @@ pub(super) enum DebugCommand {
 	/// - Synchronize database with primary (secondary only)
 	ResyncDatabase,
 
+	/// - Retrieves the saved original PDU before it has been redacted
+	GetRetainedPdu {
+		event_id: OwnedEventId,
+	},
+
 	/// - Developer test stubs
 	#[command(subcommand)]
 	#[clap(hide(true))]