# Description of Changes
Policies can currently throw when calling redact:
<img width="1186" height="824" alt="image"
src="https://github.com/user-attachments/assets/bdcc09fe-5bf4-4b0a-b119-bcc33c98c7f2"
/>
Policies really need to be updated to properly make use of the new
bidirectional mappings for this, but this will hopefully fix it for now.
Reworks the Processor (PAYG) meter to **size-scaled units** while
keeping a true **PDF count** visible and distinct from units, and
replaces the fragile content+time lineage grouping with **explicit
per-run grouping**. Built as one PR across three slices.
> Status: **all three slices committed + verified.** `:saas` payg suite
green (418 tests, 0 failures); FE green (typecheck 0, 1260 tests, lint
0, format 0). Remaining before it takes effect in prod: run the
size-scaled default-policy SQL (below) in the Supabase SQL editor +
attach the $0.01/unit Stripe price.
## Model (what we're implementing)
- **Size scaling**: 1 unit per 50 MiB (bytes only, no page charge, no
cap). *(policy-row config, applied separately via SQL.)*
- **Charge = number of input files**: split (1→N outputs) = 1 charge;
merge (N→1) = N charges. `doc_count` = input files, fixed at open;
joined steps add 0.
- **Grouping by run id, not time**: a pipeline/policy/AI run = one
`run_id`; its tool sub-steps group into one charge (content-lineage
still maps split/merge journeys *within* the run). Two separate runs on
identical bytes = two charges. The 5-min window survives only as a
stale-job janitor.
- **10-tool split kept**: within a run's single-file lineage, an 11th
tool run opens a 2nd charge (step limit 10).
- **Count vs units surfaced**: usage page shows unique PDFs,
per-category (automation/AI/API) counts + units, and how many PDFs hit a
size multiplier with avg units/PDF.
## Slice 1 — run-id grouping (behavioural core)
- `AutomationRunContext` (common) — thread-scoped run id.
- `InternalApiClient` — stamps `X-Stirling-Run-Id`.
- Orchestrators open a run scope **on the worker thread that
dispatches** (async-safe): `PipelineProcessor.runPipelineAgainstFiles`,
`PolicyEngine.runToCompletion` (uses `run.getRunId()`),
`AiWorkflowService.orchestrate`.
- `ChargeContext` + `JobContext`: add `runId`; the charge interceptor
reads the header.
- `JobService.joinOrOpen`: `runId == null` → always open fresh
(standalone never joins); non-null → match scoped to the same `run_id`.
`JpaJobLineageStore`/`JobArtifactHashRepository`: add `run_id` filter to
the match query. Step-limit 10 unchanged.
## Slice 2 — doc_count + document_fingerprint
- V33 migration + entity fields.
- `JobService.openFresh`: set `docCount = inputs.size()`, compute
`document_fingerprint` from input signatures, and denormalise both onto
the DEBIT row in `JobChargeService.recordLedgerDebit`.
## Slice 3 — usage analytics API + FE
- `WalletLedgerRepository`: per-category `SUM(units)` +
`SUM(doc_count)`, `COUNT(DISTINCT document_fingerprint)`, and count of
rows whose units exceed their doc_count (a size multiplier fired), over
the period.
- `WalletSnapshotResponse` + `PaygWalletController`: add `categoryDocs`,
`docsProcessedThisPeriod`, `uniquePdfsThisPeriod`,
`sizeMultiplierPdfsThisPeriod`.
- FE `types.ts` + `PdfsProcessedCard` + `useWallet` + `walletFixtures` +
i18n: headline is the **PDF count**; a summary line shows "{unique}
unique · {units} meter units · {avg} avg units/PDF"; the split bar is
per-category PDF counts; a size-multiplier line shows how many PDFs
scaled. Count is separated from meter units so a 5-unit large PDF reads
as "1 PDF, 5 units".
## Config (out of PR — run in the Supabase SQL editor)
Wrap in one transaction. The partial-unique `is_default` index only
allows one default, so the old default is flipped off **before** the new
one is inserted. The new policy carries the prior default's
`free_tier_units` forward (change the literal if the launch grant should
differ).
```sql
BEGIN;
-- 1) flip default off the current policy + close its effective window
UPDATE stirling_pdf.pricing_policy
SET is_default = FALSE, effective_to = now()
WHERE is_default = TRUE;
-- 2) new default: 1 unit / 5 MiB, no page charge, no scaling cap.
-- free_tier_units carried from whatever the last policy granted (COALESCE→0).
INSERT INTO stirling_pdf.pricing_policy
(version, effective_from, doc_pages_per_unit, doc_bytes_per_unit,
min_charge_units, file_unit_cap, free_tier_units, is_default, notes, created_by)
VALUES
('v2-size-scaled-2026-07', now(),
2147483647, -- doc_pages_per_unit = INT_MAX → pages never drive units
52428800, -- doc_bytes_per_unit = 50 MiB → +1 unit per 50 MiB
1, -- min_charge_units
2147483647, -- file_unit_cap = INT_MAX → no cap on size scaling
COALESCE((SELECT free_tier_units FROM stirling_pdf.pricing_policy
ORDER BY effective_from DESC LIMIT 1), 0),
TRUE, 'Size-scaled: 1 unit/5MiB, bytes only, no cap', 'connor');
-- 3) per-source step limits: standalone ops = own charge; pipelines split at 10
INSERT INTO stirling_pdf.pricing_policy_step_limit (policy_id, job_source, step_limit)
SELECT p.policy_id, s.src, s.lim
FROM stirling_pdf.pricing_policy p
CROSS JOIN (VALUES
('WEB',1),('API',1),('DESKTOP_APP',1),('LINKED_INSTANCE',1),('PIPELINE',10)
) AS s(src, lim)
WHERE p.version = 'v2-size-scaled-2026-07';
-- 4) attach the $0.01/unit Stripe price (you handle the real price id)
INSERT INTO stirling_pdf.pricing_policy_stripe_price (policy_id, stripe_price_id)
SELECT policy_id, 'price_XXXXXXXX'
FROM stirling_pdf.pricing_policy WHERE version = 'v2-size-scaled-2026-07';
COMMIT;
```
Note: the `free_tier_units` subquery reads the most-recent policy
*before* the insert — run it as written (the new row doesn't exist yet
at step 2's SELECT).
## Self-hosted parity — tracked follow-up (not in this PR)
Combined-billing (`stirling.billing.account-link.enabled`) is a
**separate metering engine** (`app/proprietary/accountlink` —
`UsageMeterService`/`LocalUsageService`/`UsageSyncService`). The unit
*math* is shared (`DocumentUnitCalculator`), so size scaling matches
once the policy is pushed. But run-id grouping, `doc_count`, and
fingerprints must be mirrored there, and the usage-sync protocol
extended to report counts/fingerprints, before the self-hosted usage
page shows the same breakdown. Frozen/deferred, so this PR does SaaS;
self-hosted mirrors when it ships.
## Overview
Adds **AI document classification** and a **classification-aware Files
sidebar**: uploaded documents are automatically tagged with
document-type labels (Invoice, Contract, Lab report, …), and the sidebar
groups files under editable parent categories so a large library stays
navigable.
> [!IMPORTANT]
> **This feature only runs in the SaaS build.** Classification depends
on the AI engine and team-scoped label storage, so it's gated to SaaS
end-to-end:
> - The sidebar grouping is a `saas/`-layer override of the
`fileSidebarGrouping` seam; every other build (OSS core, self-hosted
proprietary, desktop) gets the null stub and renders the **unchanged
flat, recency-sorted list** — no categories, no "Other", no picker.
> - The classify/labels backend endpoints are gated on
`policies.enabled` (on in SaaS) and live in `app/proprietary`, so
they're absent from pure OSS and dormant in self-hosted unless
explicitly enabled.
> - The Python classifier is reached only via that gated path.
>
> Shared-layer changes that do compile everywhere are inert without the
engine (dormant schema/field additions) or intentional (`GetInfoOnPDF`
surfacing custom metadata).
## What it does
- **Classifier (engine):** reads the first/last two pages of a PDF and
assigns document-type labels from an allowed vocabulary. Labels are
deliberately document-*type* descriptors — no deep-content/PII
detection, since only a page window is read.
- **Team label vocabulary:** ~270 built-in defaults across ~15 families,
seeded per team. Editable by team leaders/admins in the Classification
policy settings (import/export/reset). Team-scoped and shared;
**per-user personal labels are intentionally out of scope** — the
vocabulary is team-level only.
- **Sidebar categories:** files group under parent categories
(Financial, Legal, Medical, …), busiest-first, collapsible, with a
"Recent" group on top and an "Other" group for anything uncategorised.
The category structure (names, icons, membership, custom categories) is
**device-local and user-editable** via a "Customize" picker — the only
per-user personalization; it never changes the team's label vocabulary.
- Classification results are written to PDF metadata
(`StirlingPDFClassification`), read back to keep files in their groups
without re-parsing.
## Architecture
Spans all three layers, mirroring the existing policy/source subsystem
conventions:
- **`frontend/editor`** — sidebar grouping seam + SaaS override,
category manager, labels editor, icon palette, file grouping, tests,
`en-US` i18n.
- **`app/proprietary` + `app/common` + `app/core`** —
`ClassifyLabelController`, team-scoped `ClassificationLabelStore` (Jpa +
in-process impls, same shape as `PolicyStore`/`SourceStore`), metadata
read/write.
- **`engine`** — the document-classifier agent, contracts, routes,
tests.
## Screenshots
**Files sidebar — grouped by category (SaaS)**
### Loading view
<img width="2056" height="1046" alt="Screenshot 2026-07-07 at 5 12
56 PM"
src="https://github.com/user-attachments/assets/1d712da5-50ae-4349-b0cd-e62665c3ec0c"
/>
### Organized in the sidebar
<img width="2056" height="1045" alt="Screenshot 2026-07-07 at 5 14
05 PM"
src="https://github.com/user-attachments/assets/3ea4fe21-da51-4cea-bc3a-18ce040d3d05"
/>
**Customize categories picker**
### Personal settings to change how labels are grouped in an individual
users editor
<img width="2056" height="1044" alt="Screenshot 2026-07-07 at 5 52
42 PM"
src="https://github.com/user-attachments/assets/40be03ce-0f63-4d1e-b58b-cec045d01cb2"
/>
**Classification labels editor (team settings)**
<img width="2056" height="1042" alt="Screenshot 2026-07-07 at 5 53
00 PM"
src="https://github.com/user-attachments/assets/337b0739-15c9-4749-9c6b-22e3b20825b8"
/>
## Testing
- Frontend `task frontend:check` — green (editor + portal tests,
typecheck across all flavors, lint, label-drift guard).
- Backend `task backend:check` (proprietary) and `:saas:test` — green.
- Engine `task engine:check` — green.
# Description of Changes
Fix https://github.com/Stirling-Tools/Stirling-PDF-SaaS/issues/281. Add
generated backend API mappings to the frontend code, and the logic to
convert from a backend API to frontend parameters objects.
Previously, it was impossible to tell if changing the backend API would
require a change to the frontend to support it because the frontend had
no static type information about the backend API. This PR adds
autogenerated tool API types to the frontend (in `toolApiTypes.ts`) and
adds explicit typed mappings between the frontend parameter types and
the backend API types, so theoretically the type checker should be able
to catch issues when changing one puts us in an invalid state with the
other. During development, it pointed out several inconsistencies that
we have between the frontend and backend types, some of which were
genuine bugs, and others were only happening to work because the backend
is more permissive than its API claims to be.
This also unlocks the ability for us to render the frontend settings on
saved backend API structures, which we've previously had to avoid doing
because we had no reverse mapping.
Auto-generated by stirlingbot[bot]
This PR updates the backend license report based on dependency changes.
Signed-off-by: stirlingbot[bot] <stirlingbot[bot]@users.noreply.github.com>
Co-authored-by: stirlingbot[bot] <195170888+stirlingbot[bot]@users.noreply.github.com>
# Description of Changes
> [!warning]
> **Do not** squash this on merge. It should be merged via a merge
commit
Fixes conflicts in `pgvector_store.py`.
Also since codespell is failing, add comments to ignore the errors in
`sync_en_us_spelling.py`
---------
Co-authored-by: Ludy <Ludy87@users.noreply.github.com>
Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
# Description of Changes
Add new triggers:
- Schedule (fires every X amount of time)
- Folder watch (fires whenever the OS tells us a folder has a new file
in it; on Mac this is technically a 2s schedule but that's just how Java
implements it)
Add new sources:
- Folder (reads from this directory)
Add new sinks:
- Inline (stores in FileStorage)
- Folder (stores in specified directory)
Still want to do S3 buckets and web hooks and stuff, but they can come
in a future PR. I'm hoping this should make it sufficient to be able to
integrate with processing folders frontend etc. I've also changed it so
that policies can have multiple sources and triggers at once, which
seems like it might be useful.
Adds an optional MCP server (proprietary module) that exposes Stirling's
PDF operations and AI capabilities to MCP clients. Off by default, zero
footprint when disabled.
### What
- New `/mcp` endpoint: streamable-HTTP + JSON-RPC 2.0; 8 tools
(describe_operation, pages/convert/misc/security category tools, AI,
upload, download).
- Runs real operations over an internal loopback; results returned
inline as base64 (small) or by fileId (large).
### Auth (two modes)
- OAuth2 resource server: RFC 9728 protected-resource metadata, RFC 8707
audience binding, JWKS, `mcp.tools.read/write` scopes; binds each token
to a provisioned Stirling account.
- API-key mode: reuses Stirling per-user `X-API-KEY` (no IdP needed).
### Security
- Per-user file ownership in FileStorage: async/queued writes scoped to
the submitting user; legacy/owner-less files stay readable.
- Admin allow/block list controls which operations are exposed.
- Python engine gated behind a shared secret (`X-Engine-Auth`).
- MCP filter chain is isolated and cannot weaken the main app's
security.
- Hardened: no upstream error-body leakage, log injection sanitized,
fileId path/sidecar enumeration blocked.
### Config / footprint
- Disabled by default (`mcp.enabled=false`); all beans
`@ConditionalOnProperty`.
---
## Checklist
### General
- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)
### Translations (if applicable)
- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)
### UI Changes (if applicable)
- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)
### Testing (if applicable)
- [ ] I have run `task check` to verify linters, typechecks, and tests
pass
- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing)
for more details.
# Description of Changes
Add a backend for running any multi-step PDF operations. This is
designed to be used for the upcoming Policies feature, along with
anything else that will require automated running of PDF operations,
like the Automate tool or Processing Folders.
The implementation is not complete. I've tried to get all the
infrastructure in there so that we can add in whichever triggers we need
in the future (like cron triggers or watching folders on disk) but
currently it just supports manual triggering of the policy.
The basis of this work was the operation running from the Stirling
Engine, which this PR removes in favour of this new system. The only
currently accessible frontend way to test this work is to ask the AI
chat to execute multiple operations on a PDF, but I've also extensively
tested with direct API calls to make sure that the policies work and
persist properly.
# Description of Changes
Two narrowly-scoped hardening changes to the credits engine.
## 1. CreditService — move Stripe meter call to `afterCommit`
The Stripe metered-usage call sits inside the surrounding
`@Transactional`, holding the `user_credits` row lock for the duration
of an HTTP round-trip to Supabase. Under load this starves concurrent
debits; a transient Stripe blip rolls back a (correct) free-credit
consumption and forces the caller to retry.
The Stripe call now runs in a `TransactionSynchronization.afterCommit`
hook — DB commits first, Stripe fires immediately after. If Stripe fails
after commit, we log + increment a new `credits.stripe_report.failures`
counter; the idempotency key is stable, so a manual replay recovers
without double-charging.
Applied to both `consumeCreditBySupabaseId` and
`consumeCreditWithWaterfall`.
**Dead-code removed:**
- Unreachable UUID fallback for MDC `requestId` — `CorrelationIdFilter`
already guarantees the key on every request.
- The `"Unable to report usage to Stripe"` `RuntimeException` and its
catch block — the afterCommit refactor eliminates the throw path.
- `StripeRollbackOnFailureTest` — pinned the rollback-on-Stripe-fail
behaviour this refactor replaces.
## 2. `@AutoJobPostMapping` — build-time lint for `resourceWeight`
`UnifiedCreditInterceptor` multiplies `resourceWeight` into the per-call
charge. An endpoint that falls through to the annotation default
produces a charge derived from a value nobody chose.
- Annotation default flipped from `1` to `Integer.MIN_VALUE` (sentinel).
Both runtime readers (`UnifiedCreditInterceptor`, `AutoJobAspect`)
already clamp into `[1, 100]` so behaviour is unchanged.
- New `AutoJobPostMappingWeightTest` scans the classpath and fails the
build if any method leaves the sentinel.
- Initial run caught 11 endpoints relying on the default. Explicit
weights now declared, chosen by comparing to peer endpoints:
- `EditTextController` — LARGE
- `EmailController#sendEmailWithAttachment` — SMALL
- `ConvertPDFToMarkdown` — MEDIUM
- `AttachmentController` (extract/list/rename/delete) — SMALL × 4
- `ConvertImgPDFController` (cbr/cbz ↔ pdf) — MEDIUM × 2, LARGE × 2
## Tests
- `StripeUsageIdempotencyKeyTest` — pins the `(supabaseId, overage,
requestId)` idempotency key shape so Stripe always dedupes a retry.
- `StripeAfterCommitOrderingTest` — pins that `afterCommit` fires after
commit and NOT on rollback.
- `AutoJobPostMappingWeightTest` — the lint itself, plus a self-check
that the classpath scan finds at least 10 `@AutoJobPostMapping` methods
(guards against the lint passing vacuously).
Build verified: `ENABLE_SAAS=true ./gradlew :stirling-pdf:test
:saas:test`.
---
## Checklist
### General
- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable) — no translation changes
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
— internal-billing change, no public docs impact
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
— N/A
### Translations (if applicable)
- [ ] Not applicable
### UI Changes (if applicable)
- [ ] Not applicable
### Testing (if applicable)
- [x] I have run `task check` (via `./gradlew :stirling-pdf:test
:saas:test` with `ENABLE_SAAS=true`) — passes
- [x] I have tested my changes locally
# Description of Changes
## What & why
Customers using ADFS (or any generic OIDC provider that doesn't emit
`email`) hit `Attribute value for 'email' cannot be null` during OAuth2
login with no visibility into what claims the provider actually sent.
The only available remedy was guessing at
`security.oauth2.useAsUsername` until something worked.
This PR adds a new opt-in `security.oauth2.debugLogging` flag (default
`false`). When enabled, `CustomOAuth2UserService` logs:
- All ID token claims (sorted, with values)
- All UserInfo endpoint claims (if any)
- The merged attribute key set Spring exposes to `getAttribute()`
- The value the configured `useAsUsername` actually resolved to
- A **`Hint:`** line listing the claim keys present in the token that
map to a valid `UsernameAttribute` enum value — i.e. exactly what the
operator could put in `useAsUsername` to make login work
Logged at `INFO` on the success path and `ERROR` on failure (inside the
existing `catch (IllegalArgumentException)` block that throws
`OAuth2AuthenticationException`). The block is wrapped with a `[OAUTH2
DEBUG] ... [/OAUTH2 DEBUG]` banner and ends with a PII warning so
operators don't leave it on in production.
Default off → zero observable change for anyone not actively
troubleshooting.
## Files changed
| File | Why |
|---|---|
| `app/common/.../ApplicationProperties.java` | New `debugLogging` field
on the `OAUTH2` config class with javadoc warning about PII |
| `app/core/src/main/resources/settings.yml.template` | Documents
`oauth2.debugLogging` so it appears on next startup |
| `app/proprietary/.../security/service/CustomOAuth2UserService.java` |
Emits the claim dump + suggestion hint when the flag is on |
|
`app/proprietary/.../security/service/CustomOAuth2UserServiceDebugLoggingTest.java`
(new) | Unit test: mocks the OIDC delegate, asserts off-path is silent
and on-path emits the dump with the right Hint contents |
## End-to-end verification
Ran the bundled `testing/compose/docker-compose-keycloak-oauth.yml`
Keycloak realm, configured `security.oauth2.useAsUsername: mail`
(Keycloak emits `email`, not `mail`) and `provider: demarest` (matches
the original customer bug report). Triggered the OAuth flow at
`http://localhost:8080/oauth2/authorization/demarest` and confirmed:
- The ERROR-level dump fires with the full 19-claim ID token decoded
- `-- Value at 'mail' : <NULL — this is why login fails>` correctly
identifies the missing claim
- `-- Hint:` correctly suggests `[email, family_name, given_name,
preferred_username]` (the four keys present that map to valid
`UsernameAttribute` values)
- Auth still fails with the original `OAuth2AuthenticationException` —
no change to control flow, just added diagnostic logging
Unit test (`CustomOAuth2UserServiceDebugLoggingTest`) covers both
branches.
## Reviewer notes
- **No new public APIs.** The flag is config-only; no servlet endpoints
exposed.
- **PII is logged when the flag is on.** This is the whole point —
operators need to see the claims to fix their config — but it's gated,
defaults off, and the dump self-documents with a `WARNING: ... Set
security.oauth2.debugLogging=false once troubleshooting is complete.`
footer.
- **Why log everything, not just sub/email?** Because the operator
doesn't know in advance which claim they actually want. ADFS uses `upn`
in some configs and `preferred_username` in others; Azure AD uses `oid`;
the customer here had neither. Dumping the full set is the only way to
make the diagnostic self-service.
- **Out of scope for this PR (follow-ups):**
- The `UsernameAttribute` enum doesn't include `upn` / `unique_name`
(common ADFS claims). If the customer's token only has `upn`, the Hint
will be empty even though the operator can see `upn` in the dump. Worth
a separate PR to extend the enum.
- The known-provider validator in `Provider.java` (rejects e.g.
`useAsUsername: mail` for `provider: keycloak` at startup) bypasses our
diagnostic for those provider names. ADFS customers using `provider:
<name>` fall into the `default` branch so are not affected — but it's a
sharp edge worth documenting.
---
## Checklist
### General
- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable) — N/A, backend-only change
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings
### Documentation
- [ ] Doc-repo update (if functionality has heavily changed) —
diagnostic flag is self-documenting via the `settings.yml.template`
comment and the in-log warning; happy to add a doc-repo entry if
reviewers want one
- [ ] Translation tags — N/A
### UI Changes (if applicable)
- [ ] N/A — backend-only
### Testing (if applicable)
- [x] Unit test added (`CustomOAuth2UserServiceDebugLoggingTest`)
covering on/off paths and Hint correctness
- [x] End-to-end verified locally against bundled Keycloak compose with
intentionally misconfigured `useAsUsername`
- [x] Full `:proprietary:test` suite passes
