fix: security hardening and HA deployment guide#226
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Replaces fmt.Sprintf string interpolation with encoding/json to correctly escape quotes, newlines, and other special characters in error messages.
Adds an in-memory token bucket rate limiter (stdlib only: sync, time) with one bucket per source IP. The new config field register_ratelimit controls the per-minute limit (0 = unlimited); defaults to 10 in config.cfg.
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Summary
jsonErrorto usejson.Marshal(prevents unescaped special characters in error responses)corsoriginsnow defaults to[](deny all cross-origin) instead of["*"]/registerviaregister_ratelimitconfig option (default 10/min)NewTXTValuesInTransaction(parameterized query + prepared statement)time.Tickwithtime.NewTicker+stop()methoddocs/ha-deployment.md) with HAProxy and pgBouncer examplesTest Plan
go test -race ./...passesgo build ./...builds cleanlyPOST /registerfrom same IP beyond limit returns 429corsorigins = []blocks cross-origin requests by default