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Phase 1 Step 4, file 2 of 18. Same cookbook as audit_routes (4a91814+883ef70) applied to banner_routes.py. compliance/api/banner_routes.py (653 LOC) is decomposed into: compliance/api/banner_routes.py (255) — thin handlers compliance/services/banner_consent_service.py (298) — public SDK surface compliance/services/banner_admin_service.py (238) — site/category/vendor CRUD compliance/services/_banner_serializers.py ( 81) — ORM-to-dict helpers shared between the two services compliance/schemas/banner.py ( 85) — Pydantic request models Split rationale: the SDK-facing endpoints (consent CRUD, config retrieval, export, stats) and the admin CRUD endpoints (sites + categories + vendors) have distinct audiences and different auth stories, and combined they would push the service file over the 500 hard cap. Two focused services is cleaner than one ~540-line god class. The shared ORM-to-dict helpers live in a private sibling module (_banner_serializers) rather than a static method on either service, so both services can import without a cycle. Handlers follow the established pattern: - Depends(get_consent_service) or Depends(get_admin_service) - `with translate_domain_errors():` wrapping the service call - Explicit return type annotations - ~3-5 lines per handler Services raise NotFoundError / ConflictError / ValidationError from compliance.domain; no HTTPException in the service layer. mypy.ini flips compliance.api.banner_routes from ignore_errors=True to False, joining audit_routes in the strict scope. The services carry the same scoped `# mypy: disable-error-code="arg-type,assignment"` header used by the audit services for the ORM Column[T] issue. Pydantic schemas moved to compliance.schemas.banner (mirroring the Step 3 schemas split). They were previously defined inline in banner_routes.py and not referenced by anything outside it, so no backwards-compat shim is needed. Verified: - 224/224 pytest (173 baseline + 26 audit integration + 25 banner integration) pass - tests/contracts/test_openapi_baseline.py green (360/484 unchanged) - mypy compliance/ -> Success: no issues found in 123 source files - All new files under the 300 soft target (largest: 298) - banner_routes.py drops from 653 -> 255 LOC (below hard cap) Hard-cap violations remaining: 16 (was 17). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>