fix(provenance): stamp last_tx/last_eos_account on objective and action writes

[lucca65]

Paired with cambiatus/backend#434, which adds the two columns. Deploy the backend first — until the columns exist these keys would be rejected on write.

The bug

created_tx / created_eos_account are written once, on the create, and this updater deliberately never rewrites them on an edit — the create-path replay guard keys on created_tx, so rewriting it would make a later replay re-run the create and duplicate the row. That behaviour is unchanged here and should stay.

The side effect landed on the backend. DbListener announces an indexed write on user_tx:<created_eos_account> carrying created_tx, and TxSignerLive confirms only on an exact hash match. For an edit that means:

• the announcement goes to the original creator's topic — not the member who signed the edit;
• it carries the original creation hash — which can never equal the edit's hash.

So editing an action someone else created could never confirm. The signer's tracker stalled at 30s even though the chain write had landed. Closing a 2021 MUDA action as a present-day admin hit this every single time, which is how the objective-completion flow could leave an objective reopened while its actions were already closed on chain.

The change

last_tx / last_eos_account carry the writer of the current row version, alongside the untouched create provenance. The replay guard still keys on created_tx and is unaffected.

Stamped on both paths — on a create they simply equal the created_* pair, which keeps the backend's fallback (last_* || created_*) a no-op for new creates and correct for every row written before this ships.

10 lines, one file, both updaters.

Testing

• node --check passes
• npx standard src/updaters/community.js reports the same 18 pre-existing findings before and after this diff (none on the added lines)

This repo has no test suite (yarn test exits 1), so the behavioural verification lives on the backend side: test/cambiatus/db_listener_test.exs covers both an edit confirming to its actual signer under the edit's hash, and the fallback to created_* when last_* is null or blank.

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