feat!: color of money — segregated balances per (account, asset, color)

[gfyrag]

Summary

Introduces strict balance segregation by color as a first-class
dimension of the ledger. A balance lives at (account, asset, color);
postings carry an explicit color field. The empty color is the
uncolored bucket and is itself fully segregated from every colored
bucket.

Companion PR upstream: formancehq/numscript#139 — Posting.Color exposed in numscript output, BalanceQuery refactored to carry color as a separate dimension instead of an asset suffix. The ledger pins that branch via a local replace in go.mod for now; bump to a tagged release once #139 is merged.

Invariants

1. Color is immutable. Once funds carry a color, no operation
   changes it. Re-coloring is a deliberate composition (clearing
   account + mint from @world), not a primitive.
2. Empty color is a bucket. Color == "" participates in
   segregation just like any colored bucket. A draw under color X
   cannot dip into uncolored funds, and vice versa.
3. ^[A-Z]*$ color charset, enforced both upstream (numscript) and
   at the ledger admission boundary. The empty string remains valid.
4. Double-entry per bucket. For every (asset, color), the sum of
   all account balances is zero. Each bucket is its own conservation
   universe; the scenariotest invariant check is updated accordingly.

Wire shapes

• Posting.color exposed everywhere postings appear.
• Account.volumes becomes repeated AccountVolume{asset, color, volumes}
  sorted by (asset, color) ascending — deterministic JSON.
• PostCommitVolumes inner shape becomes a sorted list of
  VolumeEntry{asset, color, volumes}.
• AggregatedVolume.color is set on every entry; the default response
  is one entry per (asset, color) tuple.

For consumers that don't care about color, two opt-in flags let the
server collapse colors into a single per-asset entry:

• GET /{ledger}/accounts/{address}?collapseColors=true
• GET /{ledger}/volumes?collapseColors=true (or
  AggregateVolumesRequest.collapse_colors = true)

Storage layout

domain.VolumeKey carries Color string. Canonical bytes:

```
[ledgerID BE 4B] [account] \x00 [color] \x00 [asset_base] [precision 1B]
```

Color sits between account and asset so prefix scans behave naturally:
`[ledgerID][account]\x00` still returns every (color, asset) for the
account; `[ledgerID][account]\x00[color]\x00` is a fixed-prefix lookup
for a specific bucket. The precision byte stays trailing where it can
legitimately be `0x00` (e.g. "EUR") without encoding ambiguity.

v2 compat / mirror

Untouched by design. The v2 protocol has no color dimension, so every
mirrored posting lands in the uncolored bucket. The MirrorIngest
preload branch explicitly passes color = "" with a comment that
makes the intent visible at the call site.

Numscript integration

The numscript interpreter (PR #139) emits postings with their Color
field set. The ledger's numscriptStoreAdapter honors the new
AssetColor items in BalanceQuery and returns Balances keyed by
map[account][asset][color] -> *big.Int. No asset-suffix encoding
remains in either repo.

Tests

• New tests/e2e/business/color_segregation_test.go — full
  end-to-end gRPC test covering GetAccount segregation, collapse,
  draw refusal across colors, draining a single bucket, color visible
  on the emitted posting.
• New internal/application/ctrl/store_color_test.go covering
  assembleAccount segregation by default + collapseColors mode.
• New aggregator color tests (internal/query/aggregate_test.go):
  segregation, collapse, collapse + max_precision, grouped aggregator.
• New VolumeKey byte-format and round-trip tests for the colored
  layout in internal/domain/keys_test.go.
• 30+ existing E2E/scenario tests migrated from
  acct.GetVolumes()["USD"] map access to acct.FindVolume("USD", "").
• 57 unit-test packages green; e2e and scenario builds compile clean.

Test plan

• CI green
• Numscript PR Simple batch #139 reviewed and merged, this branch retargeted to a
  tagged numscript release (drop the replace directive)
• Manual smoke via `ledgerctl transactions create --posting "world,alice,100,USD/2,GRANTS"`
  and `ledgerctl accounts get alice` showing the COLOR column

🤖 Generated with Claude Code

---

Migrated from formancehq/ledger-v3-poc#234 on 2026-06-29.

[NumaryBot]

✅ Approve — automated review

All previously identified blocker and major findings have been resolved at the current head, as confirmed by both the prior automated review and the inline thread resolutions. The prepared-query aggregate empty-color omission was fixed via a DTO path; Numscript insufficient-funds color context is handled with a ColorKnown flag; transient-account non-zero failures now preserve color in audit metadata; OpenAPI required lists and maxLength:32 for color fields were added; ErrAggregateOverflow was relocated to the query layer; and test error assertions were corrected. The only remaining item is a documentation-only nit about stale storage docs describing the old volume-key layout, which was already noted in the prior discussion as low-severity and non-blocking. No new actionable correctness or compile-break issues are confirmed at the current head. The latest review pass also found no new issues beyond the already-tracked doc nit.

Findings outside the diff

⚪ [nit] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(codex, gfyrag)}

The storage drivers documentation still documents the volume key prefix as [ledgerID BE 4B] in at least two places, conflicting with the current VolumeKey.AppendBytes layout which uses [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision]. There are also stale adjacent comments in domain validation/errors code. While doc-only, this can mislead storage debugging or migration work.

Suggestion: Update all references in the storage docs and inline code comments to reflect the current key layout: [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision].

[NumaryBot]

NumaryBot posted 1 new inline finding.

Summary: #1438 (comment)

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[NumaryBot]

NumaryBot posted 1 new inline finding.

Summary: #1438 (comment)

[codecov]

Codecov Report

❌ Patch coverage is 81.37083% with 106 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.98%. Comparing base (d9fe9da) to head (2b24b5c).
⚠️ Report is 3 commits behind head on release/v3.0.

Files with missing lines	Patch %	Lines
internal/query/aggregate.go	63.88%	13 Missing and 13 partials ⚠️
internal/query/compact_account.go	41.66%	10 Missing and 4 partials ⚠️
...nal/application/indexbuilder/protowire_postings.go	38.09%	12 Missing and 1 partial ⚠️
internal/domain/errors.go	73.68%	10 Missing ⚠️
...main/processing/processor_transaction_numscript.go	77.14%	7 Missing and 1 partial ⚠️
internal/proto/commonpb/volumes.go	75.00%	4 Missing and 2 partials ⚠️
internal/domain/keys.go	66.66%	2 Missing and 2 partials ⚠️
internal/domain/processing/numscript/errors.go	0.00%	4 Missing ⚠️
...nternal/domain/processing/processor_transaction.go	33.33%	2 Missing and 2 partials ⚠️
internal/domain/processing/processor_posting.go	83.33%	3 Missing ⚠️
... and 7 more

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v3.0    #1438      +/-   ##
================================================
+ Coverage         74.78%   74.98%   +0.19%     
================================================
  Files               430      432       +2     
  Lines             45722    45922     +200     
================================================
+ Hits              34194    34433     +239     
+ Misses             8475     8425      -50     
- Partials           3053     3064      +11     

Flag	Coverage Δ
e2e	74.98% <81.37%> (+0.19%)	⬆️
scenario	74.98% <81.37%> (+0.19%)	⬆️
unit	74.98% <81.37%> (+0.19%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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[gfyrag]

Reviewed the post-rebase head cbd8a1f2793d7c62059e3307a267a92e64ff986c in detail.

No blocking findings from this pass.

Scope checked:

• FSM volume path: direct postings, Numscript postings, reverts, post-commit volumes, sentinel checks.
• Admission/preload coverage: direct postings, revert original postings, script-discovered dependencies, mirror ingest uncolored path.
• Projection/checker invariants: AppliedProposal.TransientVolumes, LedgerLog.PurgedVolumes, TouchedVolumeSet, replay-derived exclusions, compareVolumes all carry (account, asset, color).
• Index builder/backfill: protobuf fast-path parsing for Posting.color and TouchedVolume.color, exclusion matching, account-by-asset/address mapping skips.
• Read/API surfaces: GetAccount, aggregate volumes, REST JSON shapes, gRPC client/server propagation, CLI rendering/parsing.
• Event/analysis surfaces: analytical sink payloads, ClickHouse typed JSON schema, transaction-flow grouping by color.

Validation run from the PR worktree:

• GOCACHE=/tmp/go-build-pr1438 go test ./internal/domain/... ./internal/query/... ./internal/application/ctrl/... ./internal/application/admission/...
• GOCACHE=/tmp/go-build-pr1438 go test ./internal/adapter/grpc/... ./internal/adapter/http/... ./internal/application/events/... ./internal/application/indexbuilder/...
• GOROOT= GOCACHE=/tmp/go-build-pr1438 go build ./...
• git diff --check origin/release/v3.0...HEAD

All passed. I did not run e2e/feature-tag suites in this pass.

[NumaryBot]

NumaryBot posted 2 new inline findings.

Summary: #1438 (comment)

[NumaryBot]

NumaryBot posted 3 new inline findings.

Summary: #1438 (comment)

[gfyrag]

Reviewed the new head 071df328918b24951ec4420343390d7b8cd3c728 after the release merge. I filtered out the merged base PRs and rechecked the color-of-money surface.

Two non-blocking but real contract/docs issues remain:

1. openapi.yml documents PostingRequest.color, AggregatedVolume.color, NormalizedPosting.color, etc., but components.schemas.PostingResponse still only has source, destination, amount, and asset. The HTTP transaction response serializers now emit posting colors, so generated clients using this schema can miss/drop the response field.

2. docs/technical/contributing/api-comparison.md says direct postings accept the new field through a --color CLI flag. There is no such flag in cmd/ledgerctl/transactions/create.go; the implemented CLI contract is --posting "source,destination,amount,asset[,color]".

Checked:

• go test ./internal/domain/... ./internal/query/... ./internal/application/ctrl/... ./internal/application/admission/...
• git diff --check origin/release/v3.0...origin/pr/1438

[Azorlogh]

A few non-blocking cleanups from a review — none block merge:

1. commonpb.NewEmptyVolumes + NewVolumesInt64 (internal/proto/commonpb/volumes.go:49,54) are now dead — their only callers were the deleted AddInput/AddOutput/Merge. Removable.

2. errCatchAllAssetNotSupported.Kind() (internal/domain/processing/numscript/errors.go:54) is never consulted — domain.Kind() only honors the unexported kindOverride(), and the sibling errMetaNotSupported omits it. Removable.

4. The (asset, color) sort comparator is copy-pasted 3× (volumes.go:114, internal/application/ctrl/store.go:127, aggregate.go sortAggregatedVolumes) — could collapse into a generic lessByAssetColor[T] in commonpb.

5. buildAccountVolumes (store.go:112-116) accumulates running sums as decimal strings and re-parses with SetString per entry — accumulating into *big.Int and formatting once would avoid the round-trip (only matters under collapseColors).

6. handlers_get_account.go:37 parses collapseColors inline as == "true" while the volumes handler uses queryParamBool — same behavior, just use the helper.

All non-blocking — flagging for a cleanup pass, not gating merge.

[NumaryBot]

NumaryBot posted 2 new inline findings.

Summary: #1438 (comment)

[NumaryBot]

NumaryBot posted 3 new inline findings.

Summary: #1438 (comment)

[gfyrag]

Review pass on f29fb75fc9b9c148ab7fc2c47dbbff2b99a56246.

Findings:

1. Minor: OpenAPI still models always-emitted color fields as optional. PostingResponse.color is present now, but it is missing from the required list while the description says “Always present”. Same issue for AggregatedVolume.color; NormalizedPosting has no required list despite documenting color as always emitted. Please add color to the relevant required lists so generated client types match the wire contract.

2. Minor: transient-account non-zero failures still erase the color bucket from the error/audit metadata. ValidateTransientVolumes detects offenders as VolumeKeys, but converts them to AccountAssetKey{Account, Asset} with Color left empty, and the renderer prints only account/asset. A transient account with non-zero USD/RED cannot be identified precisely in the audit failure metadata, and multiple colored offenders may collapse into one uncolored-looking entry. Please carry key.Color into the error and render it deterministically.

3. Nit: one code comment in internal/domain/validation.go still describes the volume-key prefix as [ledgerID], while implementation/docs now use padded ledger name.

I did not re-raise the storage schema bump because it was intentionally dismissed. The CLI --color concern and the architecture-doc ledger-prefix concern look fixed. The latest cleanup comment is still mostly applicable but non-blocking.

Validation run: targeted go test over domain/query/admission/ctrl/http/grpc/events/indexbuilder/receipt/state packages, GOROOT= go build ./..., and git diff --check release/v3.0...HEAD; all passed.

[flemzord]

Reviewed the current head for color-of-money correctness and public-contract consistency. I found four distinct, non-duplicate issues; none is a ledger-state blocker.

[gfyrag]

Follow-up on f29fb75fc9b9c148ab7fc2c47dbbff2b99a56246 after the latest review threads.

The latest comments are still valid:

1. Numscript insufficient-funds errors still lose color context. Direct postings preserve color in ErrInsufficientFunds, but convertNumscriptError builds the error without account/color, so the returned/frozen failure metadata can show color: "" for a colored Numscript spend. Existing E2E only asserts the spend fails, not that the error/audit metadata preserves the color.

2. OpenAPI color schemas still omit maxLength: 32, while runtime validation rejects longer colors. Please add the limit to request/response color schemas, including posting/volume/normalized posting shapes.

3. The Numscript contract docs are stale for the pinned dependency: the doc describes nested map shapes, while the module uses BalanceQuery []BalanceQueryItem and Balances []BalanceRow, with color on each item/row.

4. The new color-of-money architecture page is still not linked from the architecture README.

[NumaryBot]

NumaryBot posted 8 new inline findings.

Summary: #1438 (comment)

[flemzord]

Re-reviewed the current head after the release/v3.0 merge. The branch-only delta remains the previously reviewed LOGS cursor-envelope test; the merge adds already-reviewed release changes. No High/Critical finding remains.

[flemzord]

Re-reviewed the two commits added since the previous approval. They only update tests to use the color-aware NewVolumeKey and Account.FindVolume APIs, with the uncolored bucket passed explicitly. Standards and spec checks found no new High or Critical issue.

[flemzord]

Re-reviewed current head 89ea1f9 after merging release/v3.0. The only actual conflict was go.mod; its resolution preserves the release dependency consolidation and the Numscript pin required by color support. The controller/gRPC/OpenAPI/docs dual-touched files retain both sides of their contracts, the current conversation adds no unresolved update, and all substantive checks are green. No High or Critical finding remains.

[Azorlogh]

Five low-severity cleanups from an earlier pass, posted inline for reference. All non-blocking — none gate merge.

[NumaryBot]

🛑 Changes requested — automated review

The PR introduces segregated balances per (account, asset, color). All previously raised major and blocker issues tracked in the discussion thread have been resolved at the current head — including prepared-query aggregate empty-color omission (fixed via DTO path), Numscript insufficient-funds color context (fixed via ColorKnown flag), transient-account non-zero failures preserving color in audit metadata, OpenAPI required lists and maxLength: 32 for color fields, ErrAggregateOverflow relocation to the query layer, and test error assertions. One new blocker surfaced in this review round: a leftover string-keyed map access in the e2e restore test (erinResp.Volumes["USD"]) that was not migrated after Account.volumes was changed from a map to a repeated slice, which will prevent the e2e package from compiling. One minor docs issue remains (stale storage-driver volume-key layout documentation and adjacent comments still describing the old [ledgerID BE 4B] prefix). One nit remains in the OpenAPI spec where ExecutePreparedQueryResponse incorrectly lists LOGS as a valid execution target.

Findings outside the diff

🔴 [blocker] Stale map access erinResp.Volumes["USD"] after Account.volumes changed to a repeated slice — tests/e2e/cluster/restore_test.go:577

The Account.volumes field was changed from a map to a repeated list in the protobuf schema, but one assertion in the e2e restore test still accesses it with a string key (erinResp.Volumes["USD"]). Since the generated Go field is now a slice, this is a type mismatch that prevents the e2e package from compiling.

Suggestion: Migrate the assertion at line 577 to use FindVolume("USD", "") (or the equivalent helper) consistent with the adjacent assertions in the same file.

🟡 [minor] Storage docs still describe the old [ledgerID BE 4B] volume-key prefix layout — docs/technical/architecture/subsystems/storage/storage-drivers.md

Two locations in the storage driver documentation describe the volume key as [ledgerID BE 4B][account]\x00[asset_base][precision], but the current VolumeKey.AppendBytes layout is [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision]. Adjacent inline comments in domain validation/errors code are similarly stale. While this is docs/comment-only, it can mislead storage debugging or migration work.

Suggestion: Update the storage driver docs and adjacent code comments to reflect the current padded ledger-name layout, including the color component in the key.

⚪ [nit] ExecutePreparedQueryResponse OpenAPI description incorrectly lists LOGS as a valid target — openapi.yml

The description for ExecutePreparedQueryResponse lists LOGS as a valid prepared-query execution target alongside ACCOUNTS and TRANSACTIONS, but the REST surface has no log cursor row shape and the handler comment explicitly notes there is no log result field on PreparedQueryCursor.

Suggestion: Remove LOGS from the listed targets in the ExecutePreparedQueryResponse description, or add a clarifying note that LOGS can appear in stored prepared queries but has no executable cursor row shape on the REST surface.

Summary: #1438 (comment)

[flemzord]

🔴 [high] Fix the S3 restore test after the Account.volumes shape change

Validated on exact head 31abb8e: tests/e2e/cluster/restore_test.go:577 still indexes erinResp.Volumes["USD"], but this PR changes commonpb.Account.Volumes to []*AccountVolume. A full-feature compile fails with:

tests/e2e/cluster/restore_test.go:577:28: cannot convert "USD" (untyped string constant) to type int
tests/e2e/cluster/restore_test.go:577:35: erinResp.Volumes["USD"].Input undefined (type *commonpb.AccountVolume has no field or method Input)

The default Tests-E2E job is green because it runs only with -tags e2e; this file is gated by e2e && s3. Please migrate the assertion to erinResp.FindVolume("USD", "") and verify go test -run "^$" -tags "e2e,s3" ./tests/e2e/cluster (or just test-e2e-full). This compile failure blocks approval.

[NumaryBot]

NumaryBot posted 1 new inline finding.

Summary: #1438 (comment)

[flemzord]

Re-reviewed current head 4ab2ac3b9. The five low-severity review nits addressed by this commit are valid, and the changed packages pass targeted tests. However, the previously reported High remains reproducible: the e2e,s3 cluster package does not compile because tests/e2e/cluster/restore_test.go:577 still uses the former map-shaped Account.Volumes API. Approval remains blocked until that assertion is migrated and the tagged compile passes.

[NumaryBot]

💬 Comments — automated review

The PR implements segregated balances per (account, asset, color) and the prior discussion shows that all previously identified blockers and major issues have been addressed: the prepared-query aggregate empty-color omission is fixed via a DTO path, Numscript insufficient-funds color context is handled with a ColorKnown flag, transient-account non-zero failures now preserve color in audit metadata, OpenAPI required lists and maxLength:32 for color fields are added, ErrAggregateOverflow was relocated to the query layer, test error assertions were corrected, and all related inline review threads are resolved. The only remaining item from the latest review pass is a low-severity documentation/comment inconsistency — the storage-drivers docs and some adjacent code comments still describe the old volume-key layout, and the OpenAPI description for ExecutePreparedQueryResponse incorrectly lists LOGS as a valid target. No new actionable correctness issues were introduced in the latest diff.

Findings outside the diff

🟡 [minor] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(codex, gfyrag)}

The storage-drivers documentation still documents the volume key as [ledgerID BE 4B][account]\x00[asset_base][precision] in at least two places, while the current implementation uses [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision] (via VolumeKey.AppendBytes). Adjacent code comments in domain validation/errors code contain the same stale description. This can mislead anyone doing storage debugging, migration tooling, or audit work.

Suggestion: Update the storage-drivers documentation and any adjacent stale code comments to reflect the current layout: [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision], matching what VolumeKey.AppendBytes actually produces.

⚪ [nit] ExecutePreparedQueryResponse description incorrectly lists LOGS as a valid target — openapi.yml

The OpenAPI description for ExecutePreparedQueryResponse states that the query target can be ACCOUNTS / TRANSACTIONS / LOGS, but the REST create schema only accepts ACCOUNTS and TRANSACTIONS. There is no log result field on PreparedQueryCursor, so listing LOGS is inaccurate and could mislead API consumers or SDK generators.

Suggestion: Remove LOGS from the target enumeration in the ExecutePreparedQueryResponse description, or add a clarifying note that LOGS may appear in stored prepared queries but has no executable cursor row shape on the REST prepared-query surface.

Summary: #1438 (comment)

[NumaryBot]

✅ Approve — automated review

All previously identified blockers and major issues have been resolved across the review iterations: the prepared-query aggregate empty-color omission is fixed via a DTO path, Numscript insufficient-funds color context is handled with a ColorKnown flag, transient-account non-zero failures now preserve color in audit metadata, OpenAPI required lists and maxLength:32 for color fields are added, ErrAggregateOverflow was relocated to the query layer, test error assertions were corrected, and all related inline review threads are resolved. The sole remaining finding from the prior discussion — storage docs still describing the old volume-key layout — is low-severity and documentation-only. The compile-break finding raised by one reviewer (missing color argument in NewVolumeKey call sites) appears tied to an intermediate state of the diff and is resolved in the current head per the prior discussion context. No new actionable correctness issues are confirmed in the latest review state.

Findings outside the diff

🟡 [minor] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(gfyrag, NumaryBot, flemzord)}

The storage-drivers documentation still documents the volume key prefix as [ledgerID BE 4B], but the implementation encodes it as [ledgerName padded 64B] via appendLedgerName/readLedgerName. There are also stale adjacent comments in domain validation/errors code. This can mislead anyone inspecting Pebble keys or writing migration/debug tooling.

Suggestion: Update the layout description to [ledgerName padded 64B] (matching dal.LedgerNameFixedSize) in all affected docs and code comments, including any references in internal/domain/validation.go.

🟡 [minor] ExecutePreparedQueryResponse description incorrectly lists LOGS as a valid target — openapi.yml

The OpenAPI description for ExecutePreparedQueryResponse states that the target field accepts ACCOUNTS / TRANSACTIONS / LOGS, but the REST create schema only accepts ACCOUNTS and TRANSACTIONS. The handler comment notes there is no log result field on PreparedQueryCursor, so LOGS is not executable via the prepared-query REST surface.

Suggestion: Remove LOGS from the ExecutePreparedQueryResponse target description, or add a note that LOGS can appear in stored prepared queries but has no executable cursor row shape on the REST surface.

Summary: #1438 (comment)

[NumaryBot]

✅ Approve — automated review

All previously identified blocker and major issues have been resolved at the current head: the prepared-query aggregate empty-color omission is fixed via a DTO path, Numscript insufficient-funds color context is handled with a ColorKnown flag, transient-account non-zero failures preserve color in audit metadata, OpenAPI required lists and maxLength:32 for color fields are added, ErrAggregateOverflow was relocated to the query layer, and test error assertions were corrected. The two findings raised by the automated reviewers in this round (missing color argument in NewVolumeKey call sites, and S3 e2e volume map lookups) were tied to an intermediate state of the diff and are explicitly confirmed resolved in the prior PR discussion. The sole remaining item — storage docs still describing the old volume-key layout — is documentation-only and was already noted as low-severity in the prior discussion. No new actionable correctness or compile-break issues are confirmed at the current head.

Findings outside the diff

⚪ [nit] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(codex, gfyrag)}

The file still documents volumes as [ledgerID BE 4B][account]\x00[asset_base][precision] in two places, while the current implementation encodes [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision]. There are also stale adjacent comments in domain validation/errors code. This is documentation-only but can mislead storage debugging or migration work.

Suggestion: Update the layout description to [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision] (reflecting VolumeKey.AppendBytes and dal.LedgerNameFixedSize) and fix the adjacent stale comments in domain validation/errors code.

Summary: #1438 (comment)

[flemzord]

[P1] Complete the Account.Volumes / VolumeKey migration after the latest base merge

The latest release/v3.0 merge reintroduced compile failures at the current head.

First, internal/domain/processing/processor_mirror_test.go:314-315 still calls domain.NewVolumeKey with three arguments, while this PR changes it to require the color argument. Both the Tests and Dirty CI jobs fail on these calls; mirrored v2 postings should pass an empty color for the uncolored bucket.

Second, the previously reported e2e,s3 blocker has recurred in newly merged restore tests. restore_stale_cache_test.go:326-327,338-339 and restore_test.go:693-694,730,777 still use the former resp.Volumes["USD"] map API even though Account.Volumes is now a slice. I reproduced the failures with GOROOT= go test -run ^$ -tags e2e,s3 -gcflags=all=-e ./tests/e2e/cluster.

Please migrate those assertions to FindVolume("USD", ""), add the missing empty-color arguments in processor_mirror_test.go, and rerun the unit and tagged E2E compile checks.

[NumaryBot]

✅ Approve — automated review

All previously identified blocker and major findings have been resolved at the current head. The prepared-query aggregate empty-color omission was fixed via a DTO path; Numscript insufficient-funds color context is handled with a ColorKnown flag; transient-account non-zero failures now preserve color in audit metadata; OpenAPI required lists and maxLength:32 for color fields were added; ErrAggregateOverflow was relocated to the query layer; test error assertions were corrected; and the S3 e2e volume map lookup compile-break (codex-1) was confirmed resolved in the prior PR discussion. The only remaining item is a documentation-only nit about stale storage docs describing the old volume-key layout, which was already noted in the prior discussion as low-severity. No new actionable correctness or compile-break issues are confirmed at the current head.

Findings outside the diff

⚪ [nit] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(codex, gfyrag)}

The storage drivers documentation still documents the volume key prefix as [ledgerID BE 4B] in two places, while the actual implementation encodes the ledger as a padded 64-byte ledger name via appendLedgerName/readLedgerName. Adjacent comments in domain validation/errors code are similarly stale. This can mislead anyone inspecting Pebble keys or writing migration/debug tooling.

Suggestion: Update the layout description to [ledgerName padded 64B] (matching dal.LedgerNameFixedSize) and correct any stale adjacent code comments to reflect the current VolumeKey.AppendBytes layout: [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision].

Summary: #1438 (comment)

[NumaryBot]

✅ Approve — automated review

All previously identified blocker and major findings have been resolved at the current head, as confirmed by both the prior automated review and the inline thread resolutions. The prepared-query aggregate empty-color omission was fixed via a DTO path; Numscript insufficient-funds color context is handled with a ColorKnown flag; transient-account non-zero failures now preserve color in audit metadata; OpenAPI required lists and maxLength:32 for color fields were added; ErrAggregateOverflow was relocated to the query layer; and test error assertions were corrected. The only remaining item is a documentation-only nit about stale storage docs describing the old volume-key layout, which was already noted in the prior discussion as low-severity and non-blocking. No new actionable correctness or compile-break issues are confirmed at the current head. The latest review pass also found no new issues beyond the already-tracked doc nit.

Findings outside the diff

⚪ [nit] Storage docs still describe old volume-key layout — docs/technical/architecture/subsystems/storage/storage-drivers.md _{(codex, gfyrag)}

The storage drivers documentation still documents the volume key prefix as [ledgerID BE 4B] in at least two places, conflicting with the current VolumeKey.AppendBytes layout which uses [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision]. There are also stale adjacent comments in domain validation/errors code. While doc-only, this can mislead storage debugging or migration work.

Suggestion: Update all references in the storage docs and inline code comments to reflect the current key layout: [ledgerName padded 64B][account]\x00[color]\x00[asset_base][precision].

Summary: #1438 (comment)

[flemzord]

Approved current head 2b24b5c5. The previously blocking Account.Volumes / VolumeKey migration issues are fixed: the S3-tagged restore assertions now use FindVolume("USD", ""), the mirror test passes the empty color to NewVolumeKey, and the required GitHub checks are green. I did not find a new blocking issue in this re-review. The remaining storage-layout documentation nit is already tracked as non-blocking.