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Fix cumulative platform cost Stripe double-counting

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Split infrastructure vs payment-processing costs. Liquidity burn now
uses infrastructure cash out only (€1,155.20 cumulative) because Stripe
fees are already deducted from net member payments. Total platform cost
(€1,158.24) remains visible for gross-margin economics.
This commit is contained in:
Bernd Worsch
2026-06-22 01:51:53 +02:00
parent fe2174f37a
commit ea2c2c6403
8 changed files with 143 additions and 97 deletions
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31
projects/coulomb-pricing/observatory/economics.py
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@@ -112,22 +112,29 @@ def build_liquidity_summary(
cost_by_period = {item.period: item for item in monthly_costs}
cumulative_payments = Decimal("0")
cumulative_cost = Decimal("0")
cumulative_infrastructure = Decimal("0")
cumulative_processing = Decimal("0")
for period in tracked:
month = cost_by_period[period]
cumulative_cost += month.platform_cost
cumulative_infrastructure += month.infrastructure_cost
cumulative_processing += month.payment_processing_cost
payment = revenue_for_period(period, revenue_entries)
cumulative_payments += payment.net_amount if payment else Decimal("0")
cumulative_net = _quantize(cumulative_payments - cumulative_cost)
# Liquidity uses net member payments vs infrastructure cash out only.
# Payment-processing fees are already deducted from net payments.
cumulative_net = _quantize(cumulative_payments - cumulative_infrastructure)
remaining = _quantize(budget.initial_budget + cumulative_net)
cumulative_total = _quantize(cumulative_infrastructure + cumulative_processing)
return LiquiditySummary(
currency=budget.currency,
through_period=through_period,
initial_budget=budget.initial_budget,
cumulative_member_payments=_quantize(cumulative_payments),
cumulative_platform_cost=_quantize(cumulative_cost),
cumulative_infrastructure_cost=_quantize(cumulative_infrastructure),
cumulative_payment_processing_cost=_quantize(cumulative_processing),
cumulative_total_platform_cost=cumulative_total,
cumulative_net_liquidity=cumulative_net,
remaining_budget=remaining,
liquidity_status=liquidity_status_for(cumulative_net),
@@ -148,22 +155,26 @@ def build_snapshot(
gross_revenue, net_revenue, revenue_source = estimate_monthly_revenue(
period, product, models, members, revenue_entries, monthly_costs
)
platform_cost = month.platform_cost
cost_per_member = _quantize(platform_cost / count) if count else Decimal("0.00")
gross_margin = _quantize(gross_revenue - platform_cost)
infrastructure = month.infrastructure_cost
processing = month.payment_processing_cost
total_platform = month.total_platform_cost
cost_per_member = _quantize(total_platform / count) if count else Decimal("0.00")
gross_margin = _quantize(gross_revenue - total_platform)
margin_pct = (
_quantize((gross_margin / gross_revenue) * Decimal("100"), PCTPLACES)
if gross_revenue
else Decimal("-100.0") if platform_cost else Decimal("0.0")
else Decimal("-100.0") if total_platform else Decimal("0.0")
)
period_net = _quantize(net_revenue - platform_cost)
period_net = _quantize(net_revenue - infrastructure)
return EconomicsSnapshot(
period=period,
currency=product.currency,
active_members=count,
monthly_revenue=_quantize(gross_revenue),
monthly_platform_cost=platform_cost,
monthly_infrastructure_cost=infrastructure,
monthly_payment_processing_cost=processing,
monthly_total_platform_cost=total_platform,
cost_per_member=cost_per_member,
gross_margin=gross_margin,
gross_margin_pct=margin_pct,