perf/store: optimize updating existing accounts

[drahnr]

Context

Currently applying a partial delta to an existing account requires loading the full account state
consisting of code, all storage map entries, all vault assets, which is very costly - we spend ~250ms on this per block (that's a lot!).

See #1538

What

Optimizes account delta updates by avoiding loading full Account objects from the database when only applying partial deltas.

Core changes

• module crates/store/src/db/models/queries/accounts/delta.rs

  • fn select_account_state_for_delta() - fetches only nonce, code_commitment, storage_header, vault_root
  • fn select_vault_balances_by_faucet_ids() - fetches only specific vault balances being updated
  • fn apply_storage_delta_with_precomputed_roots() - updates the storage header using precomputed map roots

• InnerForest::apply_block_updates now precomputes vault and storage map roots for each account update and passes them to
  Db::apply_block for partial delta updates.

• fn upsert_accounts uses the optimized path for partial deltas via enum AccountStateForInsert with three variants:

  • ::Private - no public state
  • ::FullAccount - new account creation == "full-state delta"
  • ::PartialState - incremental update == "partial delta"

• AccountRowInsert constructors: new_private(), new_from_account(), new_from_partial()

Biggest Change

We reverse the flow and update - we update the InnerForest now and track new roots, then using these in the DB storage header update. The downside is additional tackling.

[Copilot]

Pull request overview

This PR optimizes applying partial account deltas by avoiding loading full Account state (code bytes, all storage-map entries, all vault assets) during upsert_accounts, instead fetching only minimal state and computing updated headers/roots.

Changes:

• Added an optimized delta-update module to query minimal account state and compute updated storage_header / vault_root.
• Updated upsert_accounts to use an AccountStateForInsert enum to handle private, full-state, and partial-state inserts.
• Added new tests covering the optimized delta path, private upserts, and full-state delta upserts.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
crates/store/src/db/models/queries/accounts/delta.rs	New optimized queries + helpers for partial delta application (minimal state + root/header computation).
crates/store/src/db/models/queries/accounts/delta/tests.rs	New tests for optimized partial delta update, private account upsert, and full-state delta upsert.
crates/store/src/db/models/queries/accounts.rs	Integrates optimized partial-delta path into upsert_accounts; adds AccountRowInsert constructors.
alt_approach.txt	Documents an alternative design (precompute roots in InnerForest).
CHANGELOG.md	Adds a changelog entry for the performance improvement.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

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