Add liquidity tracking, budget, and platform cost history

Restore operator platform costs (Bubble, domains, Stripe) with monthly
history from March 2025 and member payments from November 2025. Track
€1,000 starting budget, cumulative burn, and remaining liquidity in the
economics dashboard. Document LQ requirements in REQUIREMENTS.md.

projects/coulomb-pricing/README.md

@@ -6,19 +6,26 @@ Generic adaptive-pricing framework concepts belong in the repository root
 (`INTENT.md`, `docs/`, `research/`, `registry/`). Execution tracking:
 `workplans/ADAPTIVE-WP-0002-economic-observatory-mvp.md`.
 
+Liquidity and cost requirements: `REQUIREMENTS.md`.
+
 ## Sprint 1 — Economic Foundations
 
 The `observatory/` package loads JSON registries and produces **Economics
-Dashboard v1** metrics:
+Dashboard v1** with platform-cost history, member payments, and budget burn.
 
 | Registry | File |
 |----------|------|
+| Budget (€1,000 start) | `data/budget.json` |
 | Product model | `data/product.json` |
 | Pricing models | `data/pricing-models.json` |
-| Costs | `data/costs.json` |
+| Platform costs + history | `data/costs.json` |
-| Revenue | `data/revenue.json` |
+| Member payments | `data/revenue.json` |
 | Membership | `data/membership.json` |
 
+**Current reality:** platform costs from March 2025; sole member payments from
+November 2025. Operator is **burning liquidity** — platform spend exceeds
+subscription intake. Customer cost-pass-through billing is not active.
+
 ### Commands
 
 ```bash
@@ -28,6 +35,5 @@ python3 -m observatory --period 2026-06
 python3 -m observatory --period 2026-06 --output reports/economics-2026-06.md
 ```
 
-**Current registry state:** one active member (founder), €8.99/month revenue, no
+Manual registries will be replaced by Bubble (Sprint 2), Stripe (Sprint 3), and
-running costs recorded. Bubble (Sprint 2) and Stripe (Sprint 3) importers will
+OpenRouter (Sprint 4) importers.
-replace manual entries when integrations land.

projects/coulomb-pricing/REQUIREMENTS.md

@@ -0,0 +1,66 @@
+# Coulomb MVP — Liquidity & Cost Requirements
+
+## Context
+
+Coulomb Social carries **operator platform costs** (Bubble.io, domains, Stripe
+fees, future OpenRouter usage) while **customer cost-pass-through billing is not
+active yet**. Members pay a flat subscription; they are not billed for
+underlying platform spend.
+
+The Economic Observatory must make the resulting **liquidity burn** visible.
+
+## Requirements
+
+### LQ-001 — Platform cost ledger
+
+Record monthly platform costs from project start (March 2025), including fixed
+infrastructure and payment-provider variable fees when member revenue exists.
+
+### LQ-002 — Member payment ledger
+
+Record member subscription payments from first payment month (November 2025),
+separate from platform cost accrual.
+
+### LQ-003 — Budget tracking
+
+Maintain an operator liquidity budget (initial: **€1,000**) and compute
+remaining budget after cumulative platform spend minus cumulative member
+payments received.
+
+### LQ-004 — Liquidity position
+
+Report whether the project is **burning**, **neutral**, or **generating**
+liquidity each period:
+
+- `period_net = member_payments - platform_costs`
+- `cumulative_net = sum(period_net)`
+- `remaining_budget = initial_budget + cumulative_net`
+
+Negative remaining budget means the MVP has consumed more liquidity than the
+allocated budget.
+
+### LQ-005 — No customer cost billing (MVP boundary)
+
+Do not allocate platform costs to customer invoices in MVP. Cost attribution
+(OpenRouter per member, usage overage) is observatory-only until a later phase
+introduces customer-visible credits or usage billing.
+
+### LQ-006 — Historical dashboard
+
+Economics Dashboard must show:
+
+- Current-period economics (revenue, platform cost, margin)
+- Cumulative liquidity summary (budget, burn, remaining)
+- Monthly history table from March 2025
+
+## Data sources (current)
+
+| Registry | Path |
+|----------|------|
+| Budget | `data/budget.json` |
+| Platform costs | `data/costs.json` (`rate_card` + `monthly_history`) |
+| Member payments | `data/revenue.json` |
+| Membership | `data/membership.json` |
+
+Future sprints replace manual history with Bubble, Stripe, and OpenRouter imports
+while preserving the same liquidity semantics.

projects/coulomb-pricing/data/budget.json

@@ -0,0 +1,7 @@
+{
+  "version": 1,
+  "currency": "EUR",
+  "initial_budget": "1000.00",
+  "started": "2025-03",
+  "note": "Operator liquidity pool for Coulomb Social MVP platform spend before the offering is cash-flow positive."
+}

projects/coulomb-pricing/data/costs.json

@@ -1,9 +1,72 @@
 {
-  "version": 1,
+  "version": 2,
-  "period": "2026-06",
-  "entries": [],
   "fx_rates": {
     "USD/EUR": "0.92"
   },
-  "note": "No running costs at present. Future fixed/variable lines (Bubble, Stripe, OpenRouter) added as they become payable."
+  "rate_card": [
+    {
+      "id": "bubble-subscription",
+      "name": "Bubble.io platform",
+      "category": "fixed",
+      "amount": "35.00",
+      "currency": "USD",
+      "cadence": "monthly",
+      "allocation": "flat"
+    },
+    {
+      "id": "domains",
+      "name": "Domains",
+      "category": "fixed",
+      "amount": "15.00",
+      "currency": "EUR",
+      "cadence": "monthly",
+      "allocation": "flat"
+    },
+    {
+      "id": "operational-overhead",
+      "name": "Operational overhead",
+      "category": "fixed",
+      "amount": "25.00",
+      "currency": "EUR",
+      "cadence": "monthly",
+      "allocation": "flat"
+    },
+    {
+      "id": "stripe-percentage",
+      "name": "Stripe percentage fee",
+      "category": "variable",
+      "amount": "0.015",
+      "currency": "ratio",
+      "cadence": "per_transaction",
+      "allocation": "percent_of_gross_revenue"
+    },
+    {
+      "id": "stripe-fixed",
+      "name": "Stripe fixed fee",
+      "category": "variable",
+      "amount": "0.25",
+      "currency": "EUR",
+      "cadence": "per_transaction",
+      "allocation": "per_active_member"
+    }
+  ],
+  "monthly_history": [
+    {"period": "2025-03", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-04", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-05", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-06", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-07", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-08", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-09", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-10", "platform_cost": "72.20", "active_members": 0, "gross_revenue": "0.00"},
+    {"period": "2025-11", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2025-12", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-01", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-02", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-03", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-04", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-05", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"},
+    {"period": "2026-06", "platform_cost": "72.58", "active_members": 1, "gross_revenue": "8.99"}
+  ],
+  "note": "Platform costs are operator expenses. Customer cost-pass-through billing is not active yet."
 }

projects/coulomb-pricing/data/membership.json

@@ -9,8 +9,8 @@
       "joined_at": "2025-11-03",
       "plan_id": "flat-899-eur-monthly",
       "source": "manual",
-      "note": "Sole active member (founder)"
+      "note": "Sole paying member; payments from November 2025"
     }
   ],
-  "note": "Current reality: one active member. Bubble importer (Sprint 2) will sync live data."
+  "note": "Platform costs run from March 2025; member payments from November 2025."
 }

projects/coulomb-pricing/data/revenue.json

@@ -1,16 +1,14 @@
 {
   "version": 1,
   "entries": [
-    {
+    {"id": "rev-2025-11", "period": "2025-11", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "id": "rev-2026-06-founder",
+    {"id": "rev-2025-12", "period": "2025-12", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "period": "2026-06",
+    {"id": "rev-2026-01", "period": "2026-01", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "gross_amount": "8.99",
+    {"id": "rev-2026-02", "period": "2026-02", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "fees_amount": "0.00",
+    {"id": "rev-2026-03", "period": "2026-03", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "refunds_amount": "0.00",
+    {"id": "rev-2026-04", "period": "2026-04", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "net_amount": "8.99",
+    {"id": "rev-2026-05", "period": "2026-05", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1},
-      "currency": "EUR",
+    {"id": "rev-2026-06", "period": "2026-06", "gross_amount": "8.99", "fees_amount": "0.38", "refunds_amount": "0.00", "net_amount": "8.61", "currency": "EUR", "source": "manual", "member_count": 1}
-      "source": "manual",
+  ],
-      "note": "Single-member subscription; Stripe sync in Sprint 3"
+  "note": "Member payments begin November 2025. Stripe sync replaces manual entries in Sprint 3."
-    }
-  ]
 }

projects/coulomb-pricing/observatory/dashboard.py

@@ -1,49 +1,103 @@
 from __future__ import annotations
 
 import argparse
+from decimal import Decimal
 from pathlib import Path
 
-from .economics import build_snapshot
+from .economics import build_liquidity_summary, build_snapshot
 from .load import (
     default_data_dir,
-    load_costs,
+    latest_period,
+    load_budget,
     load_membership,
+    load_monthly_platform_costs,
     load_pricing_models,
     load_product,
     load_revenue,
 )
-from .models import EconomicsSnapshot, PricingModel, Product
+from .models import EconomicsSnapshot, LiquiditySummary, MonthlyPlatformCost, PricingModel, Product, RevenueEntry
+
+
+def _history_rows(
+    monthly_costs: list[MonthlyPlatformCost],
+    revenue_entries: list[RevenueEntry],
+    through_period: str,
+) -> str:
+    revenue_by_period = {entry.period: entry for entry in revenue_entries}
+    lines: list[str] = []
+    for month in sorted(monthly_costs, key=lambda item: item.period):
+        if month.period > through_period:
+            continue
+        payment = revenue_by_period.get(month.period)
+        net_payment = payment.net_amount if payment else Decimal("0")
+        period_net = net_payment - month.platform_cost
+        lines.append(
+            f"| {month.period} | {month.active_members} | {month.gross_revenue} | "
+            f"{month.platform_cost} | {period_net:.2f} |"
+        )
+    return "\n".join(lines)
 
 
 def render_dashboard(
     product: Product,
     models: list[PricingModel],
     snapshot: EconomicsSnapshot,
+    liquidity: LiquiditySummary,
+    monthly_costs: list[MonthlyPlatformCost],
+    revenue_entries: list[RevenueEntry],
 ) -> str:
     active = next(m for m in models if m.id == product.active_pricing_model_id)
     registry_lines = "\n".join(
         f"| {model.id} | {model.name} | {model.model_type} | {model.status} |"
         for model in models
     )
+    history_lines = _history_rows(monthly_costs, revenue_entries, snapshot.period)
+    budget_state = (
+        "over budget"
+        if liquidity.remaining_budget < Decimal("0")
+        else "within budget"
+    )
+
     return f"""# Economics Dashboard v1 — {product.name}
 
 **Period:** {snapshot.period}  
 **Lifecycle phase:** {product.lifecycle_phase}  
 **Active pricing model:** {active.name} ({active.access_fee_amount} {active.currency}/{active.access_fee_cadence})
 
-## Key Metrics
+> Platform costs accrue to the operator. Customer cost-pass-through billing is
+> **not active** in MVP — members pay subscription only.
+
+## Key Metrics (current period)
 
 | Metric | Value |
 |--------|------:|
 | Active members | {snapshot.active_members} |
-| Monthly revenue | {snapshot.monthly_revenue} {snapshot.currency} |
+| Member payments (gross) | {snapshot.monthly_revenue} {snapshot.currency} |
-| Monthly cost | {snapshot.monthly_cost} {snapshot.currency} |
+| Platform cost | {snapshot.monthly_platform_cost} {snapshot.currency} |
-| Cost per member | {snapshot.cost_per_member} {snapshot.currency} |
+| Platform cost per member | {snapshot.cost_per_member} {snapshot.currency} |
-| Gross margin | {snapshot.gross_margin} {snapshot.currency} |
+| Period gross margin | {snapshot.gross_margin} {snapshot.currency} |
-| Gross margin % | {snapshot.gross_margin_pct}% |
+| Period gross margin % | {snapshot.gross_margin_pct}% |
+| Period net liquidity | {snapshot.period_net_liquidity} {snapshot.currency} ({snapshot.liquidity_status}) |
 
 _Revenue source: {snapshot.revenue_source}_
 
+## Liquidity & Budget (through {liquidity.through_period})
+
+| Metric | Value |
+|--------|------:|
+| Initial budget | {liquidity.initial_budget} {liquidity.currency} |
+| Cumulative member payments (net) | {liquidity.cumulative_member_payments} {liquidity.currency} |
+| Cumulative platform cost | {liquidity.cumulative_platform_cost} {liquidity.currency} |
+| Cumulative net liquidity | {liquidity.cumulative_net_liquidity} {liquidity.currency} ({liquidity.liquidity_status}) |
+| Remaining budget | {liquidity.remaining_budget} {liquidity.currency} ({budget_state}) |
+| Months tracked | {liquidity.months_tracked} |
+
+## Monthly History
+
+| Period | Members | Gross revenue | Platform cost | Net liquidity |
+|--------|--------:|--------------:|--------------:|--------------:|
+{history_lines}
+
 ## Pricing Model Registry
 
 | ID | Name | Type | Status |
@@ -53,32 +107,28 @@ _Revenue source: {snapshot.revenue_source}_
 ## Registries Loaded
 
 - Product model (`data/product.json`)
+- Budget (`data/budget.json`)
 - Pricing model registry (`data/pricing-models.json`)
-- Cost registry (`data/costs.json`)
+- Platform costs (`data/costs.json`)
-- Revenue registry (`data/revenue.json`)
+- Member payments (`data/revenue.json`)
-- Membership registry (`data/membership.json`)
+- Membership (`data/membership.json`)
+- Requirements (`REQUIREMENTS.md`)
 """
 
 
 def generate_dashboard(data_dir: Path | None = None, period: str | None = None) -> str:
     root = data_dir or default_data_dir()
     product = load_product(root)
+    budget = load_budget(root)
     models = load_pricing_models(root)
     members = load_membership(root)
     revenue = load_revenue(root)
-    cost_period, costs, fx_rates = load_costs(root)
+    monthly_costs = load_monthly_platform_costs(root)
-    target_period = period or cost_period
+    target_period = period or latest_period(monthly_costs)
 
-    snapshot = build_snapshot(
+    snapshot = build_snapshot(target_period, product, models, members, revenue, monthly_costs)
-        target_period,
+    liquidity = build_liquidity_summary(budget, revenue, monthly_costs, target_period)
-        product,
+    return render_dashboard(product, models, snapshot, liquidity, monthly_costs, revenue)
-        models,
-        members,
-        revenue,
-        costs,
-        fx_rates,
-    )
-    return render_dashboard(product, models, snapshot)
 
 
 def main(argv: list[str] | None = None) -> int:

projects/coulomb-pricing/observatory/economics.py

@@ -3,9 +3,13 @@ from __future__ import annotations
 from decimal import Decimal, ROUND_HALF_UP
 
 from .models import (
+    Budget,
     CostEntry,
     EconomicsSnapshot,
+    LiquidityStatus,
+    LiquiditySummary,
     MembershipRecord,
+    MonthlyPlatformCost,
     PricingModel,
     Product,
     RevenueEntry,
@@ -29,6 +33,14 @@ def _convert_to_eur(amount: Decimal, currency: str, fx_rates: dict[str, Decimal]
     raise ValueError(f"unsupported currency for conversion: {currency}")
 
 
+def liquidity_status_for(net: Decimal) -> LiquidityStatus:
+    if net < Decimal("0"):
+        return "burning"
+    if net > Decimal("0"):
+        return "generating"
+    return "neutral"
+
+
 def active_members(members: list[MembershipRecord]) -> int:
     return sum(1 for member in members if member.status == "active")
 
@@ -40,23 +52,7 @@ def active_pricing_model(models: list[PricingModel], product: Product) -> Pricin
     raise ValueError(f"active pricing model not found: {product.active_pricing_model_id}")
 
 
-def estimate_monthly_revenue(
+def monthly_cost_from_rate_card(
-    period: str,
-    product: Product,
-    models: list[PricingModel],
-    members: list[MembershipRecord],
-    revenue_entries: list[RevenueEntry],
-) -> tuple[Decimal, str]:
-    for entry in revenue_entries:
-        if entry.period == period and entry.currency == product.currency:
-            return entry.gross_amount, entry.source
-
-    model = active_pricing_model(models, product)
-    count = active_members(members)
-    return model.access_fee_amount * count, "derived_from_membership"
-
-
-def monthly_cost_total(
     cost_entries: list[CostEntry],
     fx_rates: dict[str, Decimal],
     gross_revenue: Decimal,
@@ -73,37 +69,106 @@ def monthly_cost_total(
     return _quantize(total)
 
 
+def revenue_for_period(period: str, revenue_entries: list[RevenueEntry]) -> RevenueEntry | None:
+    for entry in revenue_entries:
+        if entry.period == period:
+            return entry
+    return None
+
+
+def estimate_monthly_revenue(
+    period: str,
+    product: Product,
+    models: list[PricingModel],
+    members: list[MembershipRecord],
+    revenue_entries: list[RevenueEntry],
+    monthly_costs: list[MonthlyPlatformCost],
+) -> tuple[Decimal, Decimal, str]:
+    recorded = revenue_for_period(period, revenue_entries)
+    if recorded:
+        return recorded.gross_amount, recorded.net_amount, recorded.source
+
+    month = next((item for item in monthly_costs if item.period == period), None)
+    if month and month.gross_revenue > 0:
+        return month.gross_revenue, month.gross_revenue, "derived_from_platform_history"
+
+    model = active_pricing_model(models, product)
+    count = active_members(members)
+    gross = model.access_fee_amount * count
+    return gross, gross, "derived_from_membership"
+
+
+def periods_through(target: str, monthly_costs: list[MonthlyPlatformCost]) -> list[str]:
+    return sorted(item.period for item in monthly_costs if item.period <= target)
+
+
+def build_liquidity_summary(
+    budget: Budget,
+    revenue_entries: list[RevenueEntry],
+    monthly_costs: list[MonthlyPlatformCost],
+    through_period: str,
+) -> LiquiditySummary:
+    tracked = periods_through(through_period, monthly_costs)
+    cost_by_period = {item.period: item for item in monthly_costs}
+
+    cumulative_payments = Decimal("0")
+    cumulative_cost = Decimal("0")
+    for period in tracked:
+        month = cost_by_period[period]
+        cumulative_cost += month.platform_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)
+    remaining = _quantize(budget.initial_budget + cumulative_net)
+
+    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_net_liquidity=cumulative_net,
+        remaining_budget=remaining,
+        liquidity_status=liquidity_status_for(cumulative_net),
+        months_tracked=len(tracked),
+    )
+
+
 def build_snapshot(
     period: str,
     product: Product,
     models: list[PricingModel],
     members: list[MembershipRecord],
     revenue_entries: list[RevenueEntry],
-    cost_entries: list[CostEntry],
+    monthly_costs: list[MonthlyPlatformCost],
-    fx_rates: dict[str, Decimal],
 ) -> EconomicsSnapshot:
-    count = active_members(members)
+    month = next(item for item in monthly_costs if item.period == period)
-    gross_revenue, revenue_source = estimate_monthly_revenue(
+    count = month.active_members if month.active_members else active_members(members)
-        period, product, models, members, revenue_entries
+    gross_revenue, net_revenue, revenue_source = estimate_monthly_revenue(
+        period, product, models, members, revenue_entries, monthly_costs
     )
-    monthly_cost = monthly_cost_total(cost_entries, fx_rates, gross_revenue, count)
+    platform_cost = month.platform_cost
-    cost_per_member = _quantize(monthly_cost / count) if count else Decimal("0.00")
+    cost_per_member = _quantize(platform_cost / count) if count else Decimal("0.00")
-    gross_margin = _quantize(gross_revenue - monthly_cost)
+    gross_margin = _quantize(gross_revenue - platform_cost)
     margin_pct = (
         _quantize((gross_margin / gross_revenue) * Decimal("100"), PCTPLACES)
         if gross_revenue
-        else Decimal("0.0")
+        else Decimal("-100.0") if platform_cost else Decimal("0.0")
     )
+    period_net = _quantize(net_revenue - platform_cost)
 
     return EconomicsSnapshot(
         period=period,
         currency=product.currency,
         active_members=count,
         monthly_revenue=_quantize(gross_revenue),
-        monthly_cost=monthly_cost,
+        monthly_platform_cost=platform_cost,
         cost_per_member=cost_per_member,
         gross_margin=gross_margin,
         gross_margin_pct=margin_pct,
         pricing_model_count=len(models),
         revenue_source=revenue_source,
+        period_net_liquidity=period_net,
+        liquidity_status=liquidity_status_for(period_net),
     )

projects/coulomb-pricing/observatory/load.py

@@ -5,8 +5,10 @@ from decimal import Decimal
 from pathlib import Path
 
 from .models import (
+    Budget,
     CostEntry,
     MembershipRecord,
+    MonthlyPlatformCost,
     PricingModel,
     Product,
     RevenueEntry,
@@ -37,6 +39,15 @@ def load_product(data_dir: Path | None = None) -> Product:
     )
 
 
+def load_budget(data_dir: Path | None = None) -> Budget:
+    raw = _read_json((data_dir or default_data_dir()) / "budget.json")
+    return Budget(
+        currency=raw["currency"],
+        initial_budget=_money(raw["initial_budget"]),
+        started=raw["started"],
+    )
+
+
 def load_pricing_models(data_dir: Path | None = None) -> list[PricingModel]:
     raw = _read_json((data_dir or default_data_dir()) / "pricing-models.json")
     return [
@@ -54,9 +65,8 @@ def load_pricing_models(data_dir: Path | None = None) -> list[PricingModel]:
     ]
 
 
-def load_costs(data_dir: Path | None = None) -> tuple[str, list[CostEntry], dict[str, Decimal]]:
+def _parse_cost_entries(items: list[dict]) -> list[CostEntry]:
-    raw = _read_json((data_dir or default_data_dir()) / "costs.json")
+    return [
-    entries = [
         CostEntry(
             id=item["id"],
             name=item["name"],
@@ -66,10 +76,28 @@ def load_costs(data_dir: Path | None = None) -> tuple[str, list[CostEntry], dict
             cadence=item["cadence"],
             allocation=item["allocation"],
         )
-        for item in raw["entries"]
+        for item in items
     ]
+
+
+def load_cost_rate_card(data_dir: Path | None = None) -> tuple[list[CostEntry], dict[str, Decimal]]:
+    raw = _read_json((data_dir or default_data_dir()) / "costs.json")
+    items = raw.get("rate_card", raw.get("entries", []))
     fx = {pair: _money(rate) for pair, rate in raw.get("fx_rates", {}).items()}
-    return raw.get("period", ""), entries, fx
+    return _parse_cost_entries(items), fx
+
+
+def load_monthly_platform_costs(data_dir: Path | None = None) -> list[MonthlyPlatformCost]:
+    raw = _read_json((data_dir or default_data_dir()) / "costs.json")
+    return [
+        MonthlyPlatformCost(
+            period=item["period"],
+            platform_cost=_money(item["platform_cost"]),
+            active_members=item["active_members"],
+            gross_revenue=_money(item["gross_revenue"]),
+        )
+        for item in raw.get("monthly_history", [])
+    ]
 
 
 def load_revenue(data_dir: Path | None = None) -> list[RevenueEntry]:
@@ -101,3 +129,7 @@ def load_membership(data_dir: Path | None = None) -> list[MembershipRecord]:
         )
         for item in raw["members"]
     ]
+
+
+def latest_period(monthly_costs: list[MonthlyPlatformCost]) -> str:
+    return max(item.period for item in monthly_costs)

projects/coulomb-pricing/observatory/models.py

@@ -7,6 +7,7 @@ from typing import Literal
 CostCategory = Literal["fixed", "variable"]
 MemberStatus = Literal["active", "churned", "paused"]
 PricingModelStatus = Literal["active", "candidate", "retired"]
+LiquidityStatus = Literal["burning", "neutral", "generating"]
 
 
 @dataclass(frozen=True)
@@ -42,6 +43,21 @@ class CostEntry:
     allocation: str
 
 
+@dataclass(frozen=True)
+class MonthlyPlatformCost:
+    period: str
+    platform_cost: Decimal
+    active_members: int
+    gross_revenue: Decimal
+
+
+@dataclass(frozen=True)
+class Budget:
+    currency: str
+    initial_budget: Decimal
+    started: str
+
+
 @dataclass(frozen=True)
 class RevenueEntry:
     id: str
@@ -69,9 +85,24 @@ class EconomicsSnapshot:
     currency: str
     active_members: int
     monthly_revenue: Decimal
-    monthly_cost: Decimal
+    monthly_platform_cost: Decimal
     cost_per_member: Decimal
     gross_margin: Decimal
     gross_margin_pct: Decimal
     pricing_model_count: int
     revenue_source: str
+    period_net_liquidity: Decimal
+    liquidity_status: LiquidityStatus
+
+
+@dataclass(frozen=True)
+class LiquiditySummary:
+    currency: str
+    through_period: str
+    initial_budget: Decimal
+    cumulative_member_payments: Decimal
+    cumulative_platform_cost: Decimal
+    cumulative_net_liquidity: Decimal
+    remaining_budget: Decimal
+    liquidity_status: LiquidityStatus
+    months_tracked: int

projects/coulomb-pricing/reports/economics-2026-06.md

@@ -4,19 +4,55 @@
 **Lifecycle phase:** growth  
 **Active pricing model:** Standard Membership (8.99 EUR/monthly)
 
-## Key Metrics
+> Platform costs accrue to the operator. Customer cost-pass-through billing is
+> **not active** in MVP — members pay subscription only.
+
+## Key Metrics (current period)
 
 | Metric | Value |
 |--------|------:|
 | Active members | 1 |
-| Monthly revenue | 8.99 EUR |
+| Member payments (gross) | 8.99 EUR |
-| Monthly cost | 0.00 EUR |
+| Platform cost | 72.58 EUR |
-| Cost per member | 0.00 EUR |
+| Platform cost per member | 72.58 EUR |
-| Gross margin | 8.99 EUR |
+| Period gross margin | -63.59 EUR |
-| Gross margin % | 100.0% |
+| Period gross margin % | -707.3% |
+| Period net liquidity | -63.97 EUR (burning) |
 
 _Revenue source: manual_
 
+## Liquidity & Budget (through 2026-06)
+
+| Metric | Value |
+|--------|------:|
+| Initial budget | 1000.00 EUR |
+| Cumulative member payments (net) | 68.88 EUR |
+| Cumulative platform cost | 1158.24 EUR |
+| Cumulative net liquidity | -1089.36 EUR (burning) |
+| Remaining budget | -89.36 EUR (over budget) |
+| Months tracked | 16 |
+
+## Monthly History
+
+| Period | Members | Gross revenue | Platform cost | Net liquidity |
+|--------|--------:|--------------:|--------------:|--------------:|
+| 2025-03 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-04 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-05 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-06 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-07 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-08 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-09 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-10 | 0 | 0.00 | 72.20 | -72.20 |
+| 2025-11 | 1 | 8.99 | 72.58 | -63.97 |
+| 2025-12 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-01 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-02 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-03 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-04 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-05 | 1 | 8.99 | 72.58 | -63.97 |
+| 2026-06 | 1 | 8.99 | 72.58 | -63.97 |
+
 ## Pricing Model Registry
 
 | ID | Name | Type | Status |
@@ -28,7 +64,9 @@ _Revenue source: manual_
 ## Registries Loaded
 
 - Product model (`data/product.json`)
+- Budget (`data/budget.json`)
 - Pricing model registry (`data/pricing-models.json`)
-- Cost registry (`data/costs.json`)
+- Platform costs (`data/costs.json`)
-- Revenue registry (`data/revenue.json`)
+- Member payments (`data/revenue.json`)
-- Membership registry (`data/membership.json`)
+- Membership (`data/membership.json`)
+- Requirements (`REQUIREMENTS.md`)

projects/coulomb-pricing/tests/test_economics.py

@@ -3,10 +3,17 @@ from __future__ import annotations
 from decimal import Decimal
 from pathlib import Path
 
-from observatory.economics import active_members, build_snapshot, monthly_cost_total
+from observatory.economics import (
+    active_members,
+    build_liquidity_summary,
+    build_snapshot,
+    monthly_cost_from_rate_card,
+)
 from observatory.load import (
-    load_costs,
+    load_budget,
+    load_cost_rate_card,
     load_membership,
+    load_monthly_platform_costs,
     load_pricing_models,
     load_product,
     load_revenue,
@@ -20,36 +27,58 @@ def test_active_members_counts_only_active_status() -> None:
     assert active_members(members) == 1
 
 
-def test_build_snapshot_reflects_sole_member_and_zero_costs() -> None:
+def test_rate_card_matches_documented_platform_cost_without_revenue() -> None:
+    rate_card, fx_rates = load_cost_rate_card(DATA_DIR)
+    total = monthly_cost_from_rate_card(rate_card, fx_rates, Decimal("0"), 0)
+    assert total == Decimal("72.20")
+
+
+def test_rate_card_matches_platform_cost_with_one_member() -> None:
+    rate_card, fx_rates = load_cost_rate_card(DATA_DIR)
+    total = monthly_cost_from_rate_card(rate_card, fx_rates, Decimal("8.99"), 1)
+    assert total == Decimal("72.58")
+
+
+def test_build_snapshot_june_2026_shows_liquidity_burn() -> None:
     product = load_product(DATA_DIR)
     models = load_pricing_models(DATA_DIR)
     members = load_membership(DATA_DIR)
     revenue = load_revenue(DATA_DIR)
-    _, costs, fx_rates = load_costs(DATA_DIR)
+    monthly_costs = load_monthly_platform_costs(DATA_DIR)
 
-    snapshot = build_snapshot("2026-06", product, models, members, revenue, costs, fx_rates)
+    snapshot = build_snapshot("2026-06", product, models, members, revenue, monthly_costs)
 
     assert snapshot.active_members == 1
     assert snapshot.monthly_revenue == Decimal("8.99")
-    assert snapshot.revenue_source == "manual"
+    assert snapshot.monthly_platform_cost == Decimal("72.58")
-    assert snapshot.pricing_model_count == 3
+    assert snapshot.period_net_liquidity == Decimal("-63.97")
-    assert snapshot.monthly_cost == Decimal("0.00")
+    assert snapshot.liquidity_status == "burning"
-    assert snapshot.cost_per_member == Decimal("0.00")
+    assert snapshot.gross_margin == Decimal("-63.59")
-    assert snapshot.gross_margin == Decimal("8.99")
-    assert snapshot.gross_margin_pct == Decimal("100.0")
 
 
-def test_monthly_cost_is_zero_with_empty_registry() -> None:
+def test_liquidity_summary_tracks_budget_burn_through_june_2026() -> None:
-    _, costs, fx_rates = load_costs(DATA_DIR)
+    budget = load_budget(DATA_DIR)
-    total = monthly_cost_total(costs, fx_rates, Decimal("8.99"), 1)
+    revenue = load_revenue(DATA_DIR)
-    assert total == Decimal("0.00")
+    monthly_costs = load_monthly_platform_costs(DATA_DIR)
+
+    summary = build_liquidity_summary(budget, revenue, monthly_costs, "2026-06")
+
+    assert summary.initial_budget == Decimal("1000.00")
+    assert summary.cumulative_platform_cost == Decimal("1158.24")
+    assert summary.cumulative_member_payments == Decimal("68.88")
+    assert summary.cumulative_net_liquidity == Decimal("-1089.36")
+    assert summary.remaining_budget == Decimal("-89.36")
+    assert summary.liquidity_status == "burning"
+    assert summary.months_tracked == 16
 
 
-def test_dashboard_module_renders_markdown() -> None:
+def test_dashboard_renders_liquidity_sections() -> None:
     from observatory.dashboard import generate_dashboard
 
     report = generate_dashboard(DATA_DIR, "2026-06")
-    assert "# Economics Dashboard v1" in report
+    assert "Liquidity & Budget" in report
-    assert "Pricing Model Registry" in report
+    assert "Monthly History" in report
-    assert "flat-899-eur-monthly" in report
+    assert "2025-03" in report
-    assert "Active members | 1" in report
+    assert "2025-11" in report
+    assert "remaining budget" not in report.lower() or "Remaining budget" in report
+    assert "-89.36" in report