Ports main.py's _combat_session_delta / _combat_merge_into_lifetime (incl. the
documented "offense/defense use latest, additively" quirk) and the combat_stats
handler (session delta -> DB-backed lifetime merge -> delete-then-insert of
combat_stats + combat_stats_sessions). Read handlers gain the live combat
overlay (union live + DB), like Python.
Validation:
- combat.go `combat-merge` CLI folds snapshots through the accumulator; diffed
against the Python functions on identical input -> byte-IDENTICAL.
- combat_test.go golden test runs in the build (go test now part of the tracker
Dockerfile).
- Live: 40 combat lifetime rows + 40 session snapshots + rare_events flowing in
dereth_go via the shadow consumer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Parallel Go reimplementation of the dereth-tracker read side, deployed
loopback-only (:8770) and reading the dereth TimescaleDB read-only. The live
Python stack is untouched (added via a compose override, not by editing the
tracked docker-compose.yml).
- Phase 0 scaffold: stdlib net/http server (Go 1.22+ method+path routing),
/health + /api-version, multi-stage distroless Docker build, and
go-services/docker-compose.go.yml override (loopback :8770).
- Phase 1: pgx v5 pool forced into read-only transactions, a 5s /live + /trails
cache loop using the exact main.py:837 SQL, and Python-isoformat timestamps
so output matches FastAPI's jsonable_encoder.
- compare/compare_live.py: parity harness vs the live Python service. Uses the
server-stamped received_at to prove same-row full-field equality and to make
the online-set diff boundary-aware.
Verified on live traffic (73 players): identical online set + 23-key schema,
identity/type parity for all, every same-row pair matches on every field, and
diff-row pairs differ only by the ~6s two-cache refresh skew.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
