fix(package): btcpay wipe removes the whole stack's data, not just its own dir

get_data_dirs_for_app had no btcpay arm — the default mapped to
/var/lib/archipelago/btcpay alone, leaving postgres-btcpay (where the
ACCOUNT lives) and nbxplorer on disk. Uninstall-with-wipe then reinstalled
to the old account still enabled. The btcpay arm now covers all three dirs,
for every alias and stack-member id. The map stays deliberately hardcoded:
deletion code must never derive its targets from a manifest at uninstall
time (a bad manifest could aim the wipe at another app's data).

Co-Authored-By: Claude <noreply@anthropic.com>

core/archipelago/src/api/rpc/package/config.rs

@@ -541,7 +541,7 @@ pub(in crate::api::rpc) async fn get_containers_for_app(package_id: &str) -> Res
 
 #[cfg(test)]
 mod tests {
-    use super::{all_container_names, get_health_check_args};
+    use super::{all_container_names, get_data_dirs_for_app, get_health_check_args};
 
     #[test]
     fn bitcoin_variant_container_names_are_precise() {
@@ -566,6 +566,21 @@ mod tests {
         assert!(health_cmd.contains("test -w /var/lib/grafana/grafana.db"));
         assert!(health_cmd.contains("http://localhost:3000/api/health"));
     }
+
+    /// The BTCPay wipe bug (operator report 2026-08-07): a wipe must remove
+    /// the postgres volume — that is where the account lives — plus nbxplorer
+    /// and the app's own dir. The pre-fix map removed only `…/btcpay`, so a
+    /// "fresh" reinstall came back with the old account still enabled.
+    #[test]
+    fn btcpay_wipe_includes_postgres_and_nbxplorer() {
+        let dirs = get_data_dirs_for_app("btcpay-server");
+        assert!(dirs.contains(&"/var/lib/archipelago/btcpay".to_string()));
+        assert!(dirs.contains(&"/var/lib/archipelago/postgres-btcpay".to_string()));
+        assert!(dirs.contains(&"/var/lib/archipelago/nbxplorer".to_string()));
+        // Aliases and the stack-member ids must map to the same set.
+        assert_eq!(get_data_dirs_for_app("btcpay"), dirs);
+        assert_eq!(get_data_dirs_for_app("archy-btcpay-db"), dirs);
+    }
 }
 
 /// Get data directories to clean for an app.
@@ -581,6 +596,17 @@ pub(super) fn get_data_dirs_for_app(package_id: &str) -> Vec<String> {
             format!("{}/mysql-mempool", base),
             format!("{}/electrumx", base),
         ],
+        // The whole btcpay stack — the default arm's lone `…/btcpay` left
+        // postgres-btcpay (accounts!) and nbxplorer behind, so a
+        // wipe-and-reinstall came back with the old account still enabled
+        // (operator report, 2026-08-07). This list is deliberately hardcoded
+        // and reviewed: deletion code must never derive its targets from a
+        // manifest at uninstall time (a bad manifest could aim the wipe).
+        "btcpay-server" | "btcpayserver" | "btcpay" | "archy-btcpay-db" | "archy-nbxplorer" => vec![
+            format!("{}/btcpay", base),
+            format!("{}/postgres-btcpay", base),
+            format!("{}/nbxplorer", base),
+        ],
         "fedimint" => vec![
             format!("{}/fedimint", base),
             format!("{}/fedimint-gateway", base),