fix: clean up server dependencies before deletion

tests/backend/server-delete-cleanup.test.ts

@@ -0,0 +1,45 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import test from "node:test";
+
+function readSource(path: string) {
+  return readFileSync(path, "utf8");
+}
+
+function assertEnvironmentCleanupBeforeServerDelete(source: string) {
+  const environmentCleanup = source.indexOf("tx.environment.deleteMany");
+  const serverDelete = source.indexOf("tx.server.delete");
+
+  assert.notEqual(environmentCleanup, -1);
+  assert.notEqual(serverDelete, -1);
+  assert.ok(
+    environmentCleanup < serverDelete,
+    "server deletion must remove environments before deleting servers",
+  );
+}
+
+function assertStorageDestinationCleanupBeforeServerDelete(source: string) {
+  const storageCleanup = source.indexOf("tx.userStorageDestination.deleteMany");
+  const serverDelete = source.indexOf("tx.server.delete");
+
+  assert.notEqual(storageCleanup, -1);
+  assert.notEqual(serverDelete, -1);
+  assert.ok(
+    storageCleanup < serverDelete,
+    "server deletion must remove server-specific storage destinations before deleting servers",
+  );
+}
+
+test("server deletion removes dependent records before deleting the server", () => {
+  const source = readSource("src/server/routes/servers.ts");
+
+  assertEnvironmentCleanupBeforeServerDelete(source);
+  assertStorageDestinationCleanupBeforeServerDelete(source);
+});
+
+test("organization deletion removes dependent records before deleting servers", () => {
+  const source = readSource("src/server/routes/organizations.ts");
+
+  assertEnvironmentCleanupBeforeServerDelete(source);
+  assertStorageDestinationCleanupBeforeServerDelete(source);
+});