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Khalim Conn-Kowlessar b01164a2b6 Cohort residual slice 6: Table 3c row 1 helper + DVF piecewise (M+L / M+S) 
Implements SAP10.2 Appendix J Table 3c row 1 (Instantaneous combi, two-
profile EN 13203-2 / OPS 26 tests):
    (61)m = (45)m × [r1 + DVF × F3] × fu + [F2 × n_m]

DVF (Daily Volume Factor) is piecewise in V_d,m, gated on the test
profile pair: M+L (PCDF separate_dhw_tests=2) or M+S (=3). Helper
`_table_3c_dvf` keeps the spec's piecewise branches close to the
formula in `combi_loss_monthly_kwh_table_3c_two_profile_instantaneous`.

Tests:
  - 000477 element-wise LINE_61 pin via Table 3c (PCDB 18118 lodges
    r1=0.015, F2=0.0, F3=0.00014; profile_pair=M+L). Closes 000477's
    combi-loss component at abs=1e-3 against U985 PDF.
  - Parametrized DVF boundary table for M+L (V<100, V=100, V=199.8,
    V>199.8) and M+S (V<36, V∈[36,100.2], V>100.2) at abs=1e-9.

Citation fix: parser docstring updates the BRE PCDF Spec reference from
the placeholder "v1.0 §7.11" to the actual Rev 6b (12 May 2021) Gas and
Oil Boiler Table, pp. 14-15 (now landed at docs/sap-spec/). Notes that
PCDF field 48's encoding (1=schedule 2 → profile M; 2=schedules 2+3 →
M+L; 3=schedules 2+1 → M+S) drives the Table 3b/3c row selection, and
that r2 (field 55) is lodged but spec-excluded from SAP.

Table 3c rows 2-5 (storage-FGHRS / storage-combi variants) and Table
3b rows 2-5 stay deferred — symmetric "row 1 only" coverage until a
fixture exercises them.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-22 13:37:44 +00:00
..
domain Cohort residual slice 6: Table 3c row 1 helper + DVF piecewise (M+L / M+S) 2026-05-22 13:37:44 +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/.