perf: harden quotas and reduce compression overhead

.cargo/audit.toml

@@ -1,4 +1,5 @@
-# SQLx locks optional MySQL dependencies even though this project builds only
-# the PostgreSQL driver. The vulnerable RSA code is absent from `cargo tree`.
+# Reviewed 2026-07-25. SQLx locks optional MySQL dependencies even though this
+# project builds only the PostgreSQL driver; the vulnerable RSA code is absent
+# from `cargo tree`.
 [advisories]
 ignore = ["RUSTSEC-2023-0071"]