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Khalim Conn-Kowlessar 9dc6073bd3 slice S-B17: Unknown meter_type → off-peak when fuel is electric 
Refines S-B16 with a fuel-conditional rule for the Unknown tariff code
(RdSAP energy_tariff=3): all-electric dwellings whose meter_type the
assessor couldn't pin down are almost always E7-eligible (gas dwellings
default to Single). For non-electric end-uses (gas main heating), the
meter_type doesn't affect cost, so Unknown stays standard for them.

Hand-trace confirmation: 3 of the 4 worst residuals (0800-1364,
0036-1125, 0340-2394) all have meter_type=3 AND electric main fuel —
applying off-peak to these recovers the parity loss S-B16 introduced.

100-cert parity probe:
  MAE 5.04 → 4.39   (recovered to S-B15 best state)
  bias -1.20 → -0.17
  within ±10: 93% → 96%

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-18 16:42:38 +00:00
..
domain slice S-B17: Unknown meter_type → off-peak when fuel is electric 2026-05-18 16:42:38 +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/.