Fix mypy type errors in reporting module

fly.toml

@@ -0,0 +1,16 @@
+app = "py-dvt-ate"
+primary_region = "lhr"
+
+[build]
+
+[http_service]
+  internal_port = 8080
+  force_https = true
+  auto_stop_machines = "stop"
+  auto_start_machines = true
+  min_machines_running = 0
+
+[[vm]]
+  cpu_kind = "shared"
+  cpus = 1
+  memory_mb = 512