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Khalim Conn-Kowlessar ccdaba5acd slice S-B3: flat heat-loss surface awareness 
DwellingExposure flags on heat_transmission_from_cert suppress the
floor and/or roof channels when those surfaces are party with a
neighbouring dwelling. Cert mapper derives the flags from
EpcPropertyData.dwelling_type prefix:
  - "Mid-floor *"    → floor=False, roof=False
  - "Top-floor *"    → floor=False, roof=True
  - "Ground-floor *" → floor=True,  roof=False
  - everything else  → both exposed

100-cert parity probe impact:
  MAE   8.41 → 7.53   (-0.88)
  RMSE 13.98 → 11.60  (-2.38)
  bias -2.65 → -0.61  (system bias on flats essentially eliminated)

Bungalow outliers (-56 worst residual) untouched — different failure
mode (full envelope, but cascade U-values too conservative or storey
count over-counted). Next slice tackles that.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-18 14:10:45 +00:00
..
domain slice S-B3: flat heat-loss surface awareness 2026-05-18 14:10:45 +00:00
fetchers added potential file scaffolding: 2026-05-15 10:56:53 +00:00
repos added potential file scaffolding: 2026-05-15 10:56:53 +00:00
utils added potential file scaffolding: 2026-05-15 10:56:53 +00:00
README.md added potential file scaffolding: 2026-05-15 10:56:53 +00:00

README.md

Shared packages

Workspace packages consumed by services/*. Each package is its own Python distribution with its own pyproject.toml; services import via the workspace dependency mechanism ({ workspace = true }).

Package Purpose
domain/ Shared domain types — Property, BaselinePerformance, Plan, Scenario, EpcPropertyData, etc. No persistence, no IO, no business logic.
repos/ Persistence layer — one repo per aggregate. Owns the SQL. Depends on domain.
fetchers/ External API clients (gov EPC, Ofgem, Google Solar, etc.). Depend on domain for response shapes.
utils/ Cross-cutting infra — logging, S3, CloudWatch URL builders, SQS task helpers.

Adding a new shared package

Only when a real second consumer materialises. Don't pre-shatter (repos-epc, repos-property, ...) — split when a deployment needs to drop a dep, not before.

See ../ara_backend_design.md §11 for the broader monorepo layout and ../CONTEXT.md for the domain glossary that names the types living in domain/.