fix: keep DCI account creations in the block aggregate

[brunoguerios]

Problem

Dev ethereum shadow mode logged a mismatch on 2026-10-09 20:49 UTC (uniswap_v4_hooks, /contract_state, block 26157347). For hook 0xa99e3d00ad56b1522eaa34f0f2fead9c6902e772, the cache returned empty code and no slots. The DB returned 8566 bytes of code and ~1188 slots. After block 26156852, every block logged Change for an unknown account skipped for the hook.

Root cause

In block 26156852, txs 3 to 10 touch the hook. The hooks DCI traces at tx 10, finds the hook for the first time, and attaches its full state to tx 10 as a Creation. Then it adds an Update to every tx in the block that changed the hook's storage (txs 3 to 10).

The DB path reads each tx on its own and inserts the contract. The window and the entity cache read the block aggregate. AccountDelta::merge keeps the first change type, so the aggregate is Update, and EntityCache skips an Update for an unknown account.

Fix

• The DCI labels a slot re-fetch of an already-tracked account (tokens, blacklisted accounts) as Update. The account extractor labels every result Creation, and the DCI passed that label on.
• AccountDelta::merge keeps a Creation from the newer delta. After the first fix, a DCI Creation means "new to this extractor's DCI", so the promotion is safe.

Notes for reviewers

• WebSocket block messages now carry Creation, not Update, for a DCI-new account that an earlier tx in the block updated. This matches the DTO merge, which already keeps Creation.
• When a tx already holds a Substreams Update for an account that the DCI finds as new, the tx-level delta becomes Creation. The DB path then runs insert_contract, which does nothing on conflict.
• A re-fetch no longer calls insert_contract. It writes the same code and balance as before, so no new version rows appear.
• Deletion in self merged with Creation in other now gives Creation. No forward producer emits account deletions.

Follow-ups

• After the release, check dev ethereum Loki for Change for an unknown account skipped on the hooks extractors. Expect none for newly tracked accounts.

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