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Rates come\n * from Frankfurter (ECB reference rates, no API key), are cached in `fx_rates` for\n * the day, and fall back to the last cached value if the fetch fails — a stale\n * rate is a far better answer than a broken dashboard.\n *\n * Historical charges store the rate that applied on the day they were recorded,\n * so past spending is never silently re-priced when the zloty moves.\n */\nimport type { Currency } from \"../shared/types.ts\";\nimport { CURRENCIES } from \"../shared/types.ts\";\nimport { today } from \"../shared/money.ts\";\nimport { exec, getSetting, num, query, str } from \"./db.ts\";\n\nconst API = \"https://api.frankfurter.app/latest\";\n\n/** Last-resort rates so a first run with no network still renders something sane. */\nconst FALLBACK: Record> = {\n PLN: { PLN: 1, USD: 4.0, EUR: 4.3 },\n USD: { PLN: 0.25, USD: 1, EUR: 1.08 },\n EUR: { PLN: 0.23, USD: 0.93, EUR: 1 },\n};\n\nexport async function baseCurrency(): Promise {\n const fromEnv = Deno.env.get(\"BASE_CURRENCY\");\n const stored = fromEnv ?? (await getSetting(\"base_currency\"));\n const candidate = (stored ?? \"PLN\").toUpperCase() as Currency;\n return CURRENCIES.includes(candidate) ? candidate : \"PLN\";\n}\n\n/** How many units of `base` one unit of each currency is worth. */\nexport type RateTable = Record;\n\nlet memo: { base: Currency; day: string; table: RateTable } | null = null;\n\nexport async function getRates(base?: Currency): Promise {\n const target = base ?? (await baseCurrency());\n const day = today();\n if (memo && memo.base === target && memo.day === day) return memo.table;\n\n const cached = await readCache(target);\n if (cached && cached.asOf === day) {\n memo = { base: target, day, table: cached.table };\n return cached.table;\n }\n\n let table: RateTable;\n try {\n table = await fetchRates(target);\n await writeCache(target, table, day);\n } catch (err) {\n console.error(\"fx: falling back to cached/static rates:\", err);\n table = cached?.table ?? { ...FALLBACK[target] };\n }\n\n memo = { base: target, day, table };\n return table;\n}\n\nasync function fetchRates(base: Currency): Promise {\n const others = CURRENCIES.filter((c) => c !== base);\n // Frankfurter answers \"1 base = N quote\"; we want the inverse, \"1 quote = N base\".\n const res = await fetch(`${API}?base=${base}&symbols=${others.join(\",\")}`);\n if (!res.ok) throw new Error(`frankfurter ${res.status}`);\n const body = await res.json() as { rates?: Record };\n const table = { [base]: 1 } as RateTable;\n for (const c of others) {\n const perBase = body.rates?.[c];\n if (!perBase || perBase <= 0) throw new Error(`missing rate for ${c}`);\n table[c] = 1 / perBase;\n }\n return table;\n}\n\nasync function readCache(base: Currency): Promise<{ table: RateTable; asOf: string } | null> {\n const rows = await query(\"SELECT quote, rate, as_of FROM fx_rates WHERE base = ?\", [base]);\n if (rows.length === 0) return null;\n const table = { [base]: 1 } as RateTable;\n let asOf = \"\";\n for (const r of rows) {\n table[str(r.quote) as Currency] = num(r.rate);\n const rowDate = str(r.as_of) ?? 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