Adds engine.compute_partner_grouped(period, account_type=...) that
returns per-partner aggregations with aging buckets (current/1-30/
31-60/61-90/90+). SQL-direct for performance — single GROUP BY query
with conditional sum per bucket.
Foundation for the 3 partner-grouped reports landing in commit 3:
Aged Receivable, Aged Payable, Partner Ledger.
Made-with: Cursor
The engine orchestrator. compute_pnl, compute_balance_sheet,
compute_trial_balance, compute_gl, drill_down. All controllers,
wizards, AI tools must route through these methods; no direct
SQL aggregation from anywhere else.
Internal pipeline: validate -> fetch hierarchy -> SQL aggregate
-> resolve line_specs -> optional comparison + anomaly. Uses raw
SQL for the per-account aggregate (the perf-critical step), ORM
for everything else.
Per-company report lookup with global fallback (company_id desc
nulls last). Balance sheet uses 1970 epoch as date_from for
cumulative-since-inception semantics.
7 new tests, 42 total passing.
Made-with: Cursor
