[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_258":259,"_260":261},"routes/_app.x.$handle.$name",{"_97":96,"_32":45,"_105":87,"_27":106,"_13":14,"_107":-5,"_11":108,"_109":110,"_111":112,"_113":114,"_115":116,"_20":-5,"_117":-5,"_118":-5,"_119":25,"_120":121,"_122":123,"_124":-5,"_125":-5,"_126":127},"routes/_app.x.$handle.$name.branch.$branch.version.$version.diff",{"_11":12,"_13":14,"_15":16,"_17":-5,"_18":-5},"project",{"_43":44,"_32":45,"_38":46,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":-5,"_53":-5,"_18":54,"_55":-5,"_56":25,"_57":-5,"_58":-5,"_59":60,"_61":62,"_63":64,"_65":66,"_67":68,"_69":-5,"_70":71,"_72":71,"_73":74,"_75":74,"_76":74,"_77":71,"_78":71,"_79":80,"_81":82,"_83":84,"_85":25},"version",100,"changes",[19],"aiChatInfo","userId",{"_20":21,"_22":23,"_24":25,"_26":25,"_27":28,"_29":28},"file",{"_30":31,"_32":28,"_33":34,"_35":37,"_38":39,"_40":14,"_41":42,"_24":25},"previous",{"_30":31,"_32":28,"_33":34,"_35":36},"deleted",false,"deletedHere","path","check.cron.ts","latestPath","fileId","beed2fd6-ece6-11f0-b082-42dde27851f2","name","fileType","interval","content","import { email } from \"https://esm.town/v/std/email\";\nimport sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\nimport { type Book, type BookCondition, ensureBooksTable, getBooks } from \"./books.ts\";\n\nasync function recordPrice(isbn: string, price: number) {\n // One price per ISBN per day — always update to latest\n const existing = await sqlite.execute({\n sql: `SELECT id FROM price_history WHERE isbn = ? AND date(checked_at) = date('now') LIMIT 1`,\n args: [isbn],\n });\n if (existing.rows.length > 0) {\n const row = existing.rows[0] as { id: number };\n await sqlite.execute({ sql: `UPDATE price_history SET price = ?, checked_at = datetime('now') WHERE id = ?`, args: [price, row.id] });\n return;\n }\n await sqlite.execute({\n sql: `INSERT INTO price_history (isbn, price, checked_at) VALUES (?, ?, datetime('now'))`,\n args: [isbn, price],\n });\n}\n\nasync function scoreDeal(isbn: string, currentPrice: number, manualThreshold: number | null): Promise<{ isDeal: boolean; reason: string; medianPrice: number | null }> {\n if (manualThreshold != null) {\n const isDeal = currentPrice <= manualThreshold;\n return {\n isDeal,\n medianPrice: null,\n reason: isDeal\n ? `$${currentPrice.toFixed(2)} hit target of $${manualThreshold.toFixed(2)}`\n : `$${currentPrice.toFixed(2)} is above target $${manualThreshold.toFixed(2)}`,\n };\n }\n\n if (currentPrice < 10) {\n return { isDeal: true, medianPrice: null, reason: `$${currentPrice.toFixed(2)} is under $10` };\n }\n\n const result = await sqlite.execute({\n sql: `SELECT price FROM price_history WHERE isbn = ? ORDER BY checked_at ASC`,\n args: [isbn],\n });\n const prices = result.rows.map((r) => r.price as number);\n\n if (prices.length === 0) {\n return { isDeal: false, medianPrice: null, reason: \"No data yet\" };\n }\n\n const sorted = [...prices].sort((a, b) => a - b);\n const mid = Math.floor(sorted.length / 2);\n const median = sorted.length % 2 === 0 ? (sorted[mid - 1] + sorted[mid]) / 2 : sorted[mid];\n\n const dealThreshold = median * 0.69;\n const isDeal = currentPrice <= dealThreshold;\n const pctStr = (((median - currentPrice) / median) * 100).toFixed(0);\n\n return {\n isDeal,\n medianPrice: median,\n reason: isDeal\n ? `$${currentPrice.toFixed(2)} is ${pctStr}% below median $${median.toFixed(2)}`\n : `$${currentPrice.toFixed(2)} — median is $${median.toFixed(2)}`,\n };\n}\n\nasync function fetchBookPrice(isbn: string, condition: BookCondition = \"both\") {\n const condParam = condition === \"used\" ? \"&new_used=U\" : condition === \"new\" ? \"&new_used=N\" : \"\";\n const url = `https://www.bookfinder.com/search/?isbn=${isbn}&mode=isbn&st=sr&ac=qr${condParam}`;\n\n const response = await fetch(url, {\n headers: {\n \"User-Agent\": \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36\",\n },\n });\n\n if (!response.ok) {\n return { lowestPrice: null, prices: [] as number[], url, error: `HTTP ${response.status}` };\n }\n\n const html = await response.text();\n\n // Parse the embedded JSON offer data, which distinguishes rentals (rentalDurationDays present) from buys\n const idx = html.indexOf(\"allOffers\");\n console.log(`fetchBookPrice(${isbn}): allOffers found=${idx !== -1}, htmlLen=${html.length}`);\n if (idx !== -1) {\n try {\n const unesc = html.slice(idx).replace(/\\\\\"/g, '\"');\n const arrStart = unesc.indexOf(\"[\");\n let depth = 0, end = 0;\n for (let i = arrStart; i < unesc.length; i++) {\n if (unesc[i] === \"[\") depth++;\n else if (unesc[i] === \"]\") { depth--; if (depth === 0) { end = i + 1; break; } }\n }\n const offers: { price: number; shippingPrice?: number; condition: string; rentalDurationDays?: number }[] = JSON.parse(\n unesc.slice(arrStart, end),\n );\n const rentals = offers.filter((o) => o.rentalDurationDays);\n const buyOffers = offers.filter((o) => !o.rentalDurationDays);\n const prices = buyOffers.map((o) => o.price + (o.shippingPrice ?? 0)).filter((p) => p > 0 && p < 10000).sort((a, b) => a - b);\n console.log(`fetchBookPrice(${isbn}): ${offers.length} offers, ${rentals.length} rentals excluded, ${buyOffers.length} buys, lowest=${prices[0]}`);\n if (prices.length > 0) {\n return { lowestPrice: prices[0], prices, url };\n }\n } catch (e) {\n console.log(`fetchBookPrice(${isbn}): JSON parse failed: ${e}`);\n }\n }\n\n // Fallback: regex scrape\n console.log(`fetchBookPrice(${isbn}): falling back to regex`);\n const prices: number[] = [];\n const regex = /\\$([0-9,]+\\.[0-9]{2})<\\/span>/g;\n let match;\n while ((match = regex.exec(html)) !== null) {\n const price = parseFloat(match[1].replace(/,/g, \"\"));\n if (price > 0 && price < 10000) prices.push(price);\n }\n\n if (prices.length === 0) {\n return { lowestPrice: null, prices: [] as number[], url, error: \"No prices found\" };\n }\n\n return { lowestPrice: Math.min(...prices), prices: prices.sort((a, b) => a - b), url };\n}\n\n/**\n * Check price for a single ISBN: fetch from BookFinder, record in price_history.\n * Returns the lowest price found, or null if unavailable.\n */\nexport async function checkSingleBook(isbn: string, condition: BookCondition = \"both\"): Promise {\n await ensureBooksTable();\n const result = await fetchBookPrice(isbn, condition);\n if (result.error || result.lowestPrice == null) {\n console.log(`checkSingleBook(${isbn}): ${result.error ?? \"no price\"}`);\n return null;\n }\n await recordPrice(isbn, result.lowestPrice);\n return result.lowestPrice;\n}\n\nexport default async function main() {\n console.log(\"Checking book prices...\");\n await ensureBooksTable();\n\n const books = await getBooks();\n for (const book of books) {\n const result = await fetchBookPrice(book.isbn, book.condition);\n\n if (result.error || result.lowestPrice == null) {\n console.log(`${book.title}: Error - ${result.error ?? \"no price\"}`);\n continue;\n }\n\n await recordPrice(book.isbn, result.lowestPrice);\n\n const deal = await scoreDeal(book.isbn, result.lowestPrice, book.priceThreshold);\n console.log(`${book.title}: $${result.lowestPrice.toFixed(2)} — ${deal.reason}`);\n\n if (deal.isDeal) {\n const medianStr = deal.medianPrice != null ? `$${deal.medianPrice.toFixed(2)}` : \"unknown\";\n await email({\n subject: `Deal Alert: ${book.title} is $${result.lowestPrice.toFixed(2)} (usually ${medianStr})!`,\n text: `${deal.reason}\\n\\nCurrent price: $${result.lowestPrice.toFixed(2)}\\nMedian price: ${medianStr}\\n\\nTop 5 prices: ${result.prices.slice(0, 5).map((p) => `$${p}`).join(\", \")}\\n\\nBuy: ${result.url}`,\n });\n console.log(\"Deal email sent!\");\n }\n }\n}\n","import { email } from \"https://esm.town/v/std/email\";\nimport sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\nimport { type Book, type BookCondition, ensureBooksTable, getBooks } from \"./books.ts\";\n\nasync function recordPrice(isbn: string, price: number) {\n // One price per ISBN per day — always update to latest\n const existing = await sqlite.execute({\n sql: `SELECT id FROM price_history WHERE isbn = ? AND date(checked_at) = date('now') LIMIT 1`,\n args: [isbn],\n });\n if (existing.rows.length > 0) {\n const row = existing.rows[0] as { id: number };\n await sqlite.execute({ sql: `UPDATE price_history SET price = ?, checked_at = datetime('now') WHERE id = ?`, args: [price, row.id] });\n return;\n }\n await sqlite.execute({\n sql: `INSERT INTO price_history (isbn, price, checked_at) VALUES (?, ?, datetime('now'))`,\n args: [isbn, price],\n });\n}\n\nasync function scoreDeal(isbn: string, currentPrice: number, manualThreshold: number | null): Promise<{ isDeal: boolean; reason: string; medianPrice: number | null }> {\n if (manualThreshold != null) {\n const isDeal = currentPrice <= manualThreshold;\n return {\n isDeal,\n medianPrice: null,\n reason: isDeal\n ? `$${currentPrice.toFixed(2)} hit target of $${manualThreshold.toFixed(2)}`\n : `$${currentPrice.toFixed(2)} is above target $${manualThreshold.toFixed(2)}`,\n };\n }\n\n if (currentPrice < 10) {\n return { isDeal: true, medianPrice: null, reason: `$${currentPrice.toFixed(2)} is under $10` };\n }\n\n const result = await sqlite.execute({\n sql: `SELECT price FROM price_history WHERE isbn = ? ORDER BY checked_at ASC`,\n args: [isbn],\n });\n const prices = result.rows.map((r) => r.price as number);\n\n if (prices.length === 0) {\n return { isDeal: false, medianPrice: null, reason: \"No data yet\" };\n }\n\n const sorted = [...prices].sort((a, b) => a - b);\n const mid = Math.floor(sorted.length / 2);\n const median = sorted.length % 2 === 0 ? (sorted[mid - 1] + sorted[mid]) / 2 : sorted[mid];\n\n const dealThreshold = median * 0.69;\n const isDeal = currentPrice <= dealThreshold;\n const pctStr = (((median - currentPrice) / median) * 100).toFixed(0);\n\n return {\n isDeal,\n medianPrice: median,\n reason: isDeal\n ? `$${currentPrice.toFixed(2)} is ${pctStr}% below median $${median.toFixed(2)}`\n : `$${currentPrice.toFixed(2)} — median is $${median.toFixed(2)}`,\n };\n}\n\nasync function fetchBookPrice(isbn: string, condition: BookCondition = \"both\") {\n const condParam = condition === \"used\" ? \"&new_used=U\" : condition === \"new\" ? \"&new_used=N\" : \"\";\n const url = `https://www.bookfinder.com/search/?isbn=${isbn}&mode=isbn&st=sr&ac=qr${condParam}`;\n\n const response = await fetch(url, {\n headers: {\n \"User-Agent\": \"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36\",\n },\n });\n\n if (!response.ok) {\n return { lowestPrice: null, prices: [] as number[], url, error: `HTTP ${response.status}` };\n }\n\n const html = await response.text();\n\n // Parse allOffers via the outer Next.js RSC JSON string (handles all escaping correctly)\n const aoIdx = html.indexOf(\"allOffers\");\n if (aoIdx !== -1) {\n try {\n const pushIdx = html.lastIndexOf(\"__next_f.push\", aoIdx);\n const strStart = html.indexOf('\"', pushIdx + 14);\n let i = strStart + 1, esc = false;\n while (i < html.length) {\n if (esc) { esc = false; } else if (html[i] === \"\\\\\") { esc = true; } else if (html[i] === '\"') break;\n i++;\n }\n const inner = JSON.parse(html.slice(strStart, i + 1));\n const idx2 = inner.indexOf(\"allOffers\");\n const arrStart = inner.indexOf(\"[\", idx2);\n let depth = 0, end = 0;\n for (let j = arrStart; j < inner.length; j++) {\n if (inner[j] === \"[\") depth++;\n else if (inner[j] === \"]\") { depth--; if (depth === 0) { end = j + 1; break; } }\n }\n const offers: { price: number; shippingPrice?: number; condition: string; rentalDurationDays?: number }[] =\n JSON.parse(inner.slice(arrStart, end));\n const buyOffers = offers.filter((o) => !o.rentalDurationDays);\n const prices = buyOffers.map((o) => o.price + (o.shippingPrice ?? 0))\n .filter((p) => p > 0 && p < 10000).sort((a, b) => a - b);\n if (prices.length > 0) return { lowestPrice: prices[0], prices, url };\n } catch (e) {\n console.log(`fetchBookPrice(${isbn}): parse failed: ${e}`);\n }\n }\n\n return { lowestPrice: null, prices: [] as number[], url, error: \"No prices found\" };\n}\n\n/**\n * Check price for a single ISBN: fetch from BookFinder, record in price_history.\n * Returns the lowest price found, or null if unavailable.\n */\nexport async function checkSingleBook(isbn: string, condition: BookCondition = \"both\"): Promise {\n await ensureBooksTable();\n const result = await fetchBookPrice(isbn, condition);\n if (result.error || result.lowestPrice == null) {\n console.log(`checkSingleBook(${isbn}): ${result.error ?? \"no price\"}`);\n return null;\n }\n await recordPrice(isbn, result.lowestPrice);\n return result.lowestPrice;\n}\n\nexport default async function main() {\n console.log(\"Checking book prices...\");\n await ensureBooksTable();\n\n const books = await getBooks();\n for (const book of books) {\n const result = await fetchBookPrice(book.isbn, book.condition);\n\n if (result.error || result.lowestPrice == null) {\n console.log(`${book.title}: Error - ${result.error ?? \"no price\"}`);\n continue;\n }\n\n await recordPrice(book.isbn, result.lowestPrice);\n\n const deal = await scoreDeal(book.isbn, result.lowestPrice, book.priceThreshold);\n console.log(`${book.title}: $${result.lowestPrice.toFixed(2)} — ${deal.reason}`);\n\n if (deal.isDeal) {\n const medianStr = deal.medianPrice != null ? `$${deal.medianPrice.toFixed(2)}` : \"unknown\";\n await email({\n subject: `Deal Alert: ${book.title} is $${result.lowestPrice.toFixed(2)} (usually ${medianStr})!`,\n text: `${deal.reason}\\n\\nCurrent price: $${result.lowestPrice.toFixed(2)}\\nMedian price: ${medianStr}\\n\\nTop 5 prices: ${result.prices.slice(0, 5).map((p) => `$${p}`).join(\", \")}\\n\\nBuy: ${result.url}`,\n });\n console.log(\"Deal email sent!\");\n }\n }\n}\n","createdAt",["D",1772764991840],"branchVersion","branchId","beea2462-ece6-11f0-b082-42dde27851f2","id","bee9b108-ece6-11f0-b082-42dde27851f2","used_book_price_check",["D",1767913623802],"deletedAt","legacyEnvVars","privacy","public","httpPrivacy","description","imageUrl","f70205b0-2223-11f0-9b13-dfe0c265f9b2","pinnedFileId","pinPreview","pinMigrated","screenshotVersion","likeCount",1,"orgId","e7fa224c-708c-4eec-b658-5e34106ab50f","tursoName","bee9b108ece611f0b08242dde27851f2","tursoHostname","bee9b108ece611f0b08242dde27851f2-val-town.aws-us-east-2.turso.io","tursoMeasuredAt",["D",1789455078571],"pinned","userPerm","r","valPerm","blobPerm","rw","emailPerm","sqlitePerm","projectPerm","telemetryPerm","user",{"_97":96,"_104":100},"org",{"_97":96,"_98":-5,"_99":100,"_18":54,"_101":102,"_103":25},"branch",{"_13":86,"_32":87,"_43":42,"_88":44,"_89":-5,"_90":-5,"_91":-5,"_92":-5,"_93":-5,"_94":45,"_95":96},"isOwned",136,"main","projectId","forkedBranchId","forkedBranchVersion","forkedProjectPrivacy","forkedProjectId","forkedProjectOrgId","projectName","userHandle","dubin","handle","displayName","avatar","https://img.clerk.com/eyJ0eXBlIjoiZGVmYXVsdCIsImlpZCI6Imluc18yTm10cGhQUklwU0tqZHNiOHNnNGd2ZjJURFUiLCJyaWQiOiJ1c2VyXzJ3RXcxYzN6QnFaaGJQaE9HTnY4WHV1VXV4ZyJ9","tier","free","canRestrictVals","profileImageUrl","branchName","","adoptOrgId",{"_43":44,"_32":45,"_38":253,"_47":-5,"_48":25,"_49":50,"_51":50,"_52":-5,"_53":-5,"_18":54,"_55":-5,"_56":25,"_57":-5,"_58":-5,"_59":60,"_61":62,"_63":64,"_65":66,"_67":254,"_69":-5,"_70":71,"_72":71,"_73":74,"_75":74,"_76":74,"_77":71,"_78":71,"_79":255,"_81":256,"_83":257,"_85":25},"tree",[210,212,213,214,215,216,217,218],"files",[210,211,212,213,214,215,216,217,218],"counts",{"_199":162,"_200":60,"_201":162,"_202":203,"_204":205},"contents",[128,129,130,131,132,133,134,135],"upstreamProject","upstreamBranch","emptyEnvVars","flags",[],"hasHttpFiles",true,"grants","orgs","customDomains",{},{"_43":192,"_32":193,"_30":194,"_139":-5,"_41":42,"_40":195,"_141":123,"_38":196,"_13":162,"_33":197,"_35":-5,"_24":25,"_146":-5,"_27":198},{"_43":185,"_32":186,"_30":187,"_139":-5,"_41":42,"_40":188,"_141":123,"_38":189,"_13":162,"_33":20,"_35":190,"_24":25,"_146":-5,"_27":191},{"_43":178,"_32":179,"_30":180,"_139":-5,"_41":42,"_40":181,"_141":123,"_38":182,"_13":162,"_33":20,"_35":183,"_24":25,"_146":-5,"_27":184},{"_43":169,"_32":170,"_30":171,"_139":-5,"_41":42,"_40":172,"_141":25,"_38":173,"_13":174,"_33":175,"_35":176,"_24":25,"_146":-5,"_27":177},{"_43":165,"_32":28,"_30":31,"_139":-5,"_41":42,"_40":14,"_141":25,"_38":166,"_13":167,"_33":34,"_35":37,"_24":25,"_146":-5,"_27":168},{"_43":157,"_32":158,"_30":159,"_139":-5,"_41":42,"_40":160,"_141":123,"_38":161,"_13":162,"_33":20,"_35":163,"_24":25,"_146":-5,"_27":164},{"_43":149,"_32":150,"_30":151,"_139":-5,"_41":42,"_40":152,"_141":25,"_38":153,"_13":154,"_33":34,"_35":155,"_24":25,"_146":-5,"_27":156},{"_43":136,"_32":137,"_30":138,"_139":-5,"_41":42,"_40":140,"_141":25,"_38":142,"_13":143,"_33":144,"_35":145,"_24":25,"_146":147,"_27":148},"3abed89e-1744-11f1-8d83-42dde27851f2","ui.http.ts","22f1044e-0c4a-11f1-8df8-42dde27851f2","parentId",95,"latest",["D",1772571723586],35,"http","import sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\nimport { ensureBooksTable } from \"./books.ts\";\nimport { checkSingleBook } from \"./check.cron.ts\";\n\ninterface Book {\n isbn: string;\n title: string;\n price_threshold: number | null;\n archived: number;\n condition: string;\n}\n\ninterface PriceRecord {\n isbn: string;\n price: number;\n checked_at: string;\n}\n\ninterface HistoryEntry {\n price: number;\n date: string;\n}\n\ninterface BookRow {\n isbn: string;\n title: string;\n latestPrice: number | null;\n medianPrice: number | null;\n lowestEver: number | null;\n alertThreshold: number | null;\n manualThreshold: number | null;\n prevPrice: number | null;\n isDeal: boolean;\n archived: boolean;\n condition: string;\n history: HistoryEntry[];\n}\n\nfunction escapeHtml(s: string): string {\n return s.replace(/&/g, \"&\").replace(//g, \">\").replace(/\"/g, \""\");\n}\n\nfunction computeMedian(prices: number[]): number {\n const sorted = [...prices].sort((a, b) => a - b);\n const mid = Math.floor(sorted.length / 2);\n return sorted.length % 2 === 0\n ? (sorted[mid - 1] + sorted[mid]) / 2\n : sorted[mid];\n}\n\nfunction renderRow(b: BookRow, i: number) {\n const safeTitle = escapeHtml(b.title);\n const safeIsbn = escapeHtml(b.isbn);\n\n let badgeClass: string;\n let badgeText: string;\n if (b.latestPrice === null) {\n badgeClass = \"badge-gray\";\n badgeText = \"No data\";\n } else if (b.isDeal) {\n badgeClass = \"badge-green\";\n badgeText = \"Deal\";\n } else {\n badgeClass = \"badge-default\";\n badgeText = \"Tracking\";\n }\n\n let changeDisplay = \"—\";\n let changeClass = \"col-change\";\n let sortDiff = 0;\n if (b.latestPrice !== null && b.prevPrice !== null) {\n const diff = b.latestPrice - b.prevPrice;\n sortDiff = diff;\n if (diff < 0) {\n changeDisplay = `-$${Math.abs(diff).toFixed(2)}`;\n changeClass = \"col-change change-down\";\n } else if (diff > 0) {\n changeDisplay = `+$${diff.toFixed(2)}`;\n changeClass = \"col-change change-up\";\n } else {\n changeDisplay = \"$0.00\";\n }\n }\n\n const priceDisplay = b.latestPrice !== null ? `$${b.latestPrice.toFixed(2)}` : \"—\";\n const medianDisplay = b.medianPrice !== null ? `$${b.medianPrice.toFixed(2)}` : \"—\";\n const lowestDisplay = b.lowestEver !== null ? `$${b.lowestEver.toFixed(2)}` : \"—\";\n const effectiveThreshold = b.manualThreshold ?? b.alertThreshold;\n const alertLabel = effectiveThreshold !== null ? `$${effectiveThreshold.toFixed(2)}` : \"< $10\";\n const alertSuffix = b.manualThreshold !== null ? ' manual' : \"\";\n const condParam = b.condition === \"used\" ? \"&new_used=U\" : b.condition === \"new\" ? \"&new_used=N\" : \"\";\n const condLabel = b.condition !== \"both\" ? ` · ${b.condition}` : \"\";\n const bookfinderUrl = `https://www.bookfinder.com/search/?isbn=${encodeURIComponent(b.isbn)}&mode=isbn&st=sr&ac=qr${condParam}`;\n\n const historyPills = b.history.slice(-15).map((h) => {\n let cls = \"pill\";\n if (b.medianPrice != null && h.price < b.medianPrice * 0.8) cls = \"pill pill-good\";\n return `$${h.price.toFixed(2)} ${h.date}`;\n }).join(\"\");\n\n const hasHistory = b.history.length > 0;\n const hideLabel = b.archived ? \"Show\" : \"Hide\";\n const hideAction = b.archived ? 0 : 1;\n\n return `\n \n \n ${safeTitle}\n

${safeIsbn}${condLabel}

\n \n ${priceDisplay}${b.medianPrice !== null ? `

(${medianDisplay})

` : \"\"}\n ${changeDisplay}\n ${lowestDisplay}\n ${alertLabel}${alertSuffix}\n ${badgeText}\n \n \n ${hasHistory ? `` : \"\"}\n \n \n \n \n ${hasHistory ? `

${historyPills}

` : \"\"}`;\n}\n\nfunction html(books: BookRow[]) {\n const active = books.filter((b) => !b.archived);\n const hidden = books.filter((b) => b.archived);\n\n const activeRows = active.map((b, i) => renderRow(b, i)).join(\"\");\n const hiddenRows = hidden.map((b, i) => renderRow(b, active.length + i)).join(\"\");\n\n const thead = `\n Book\n Latest (Median)\n Change\n Lowest\n Alert At\n Status\n \n `;\n\n const table = active.length > 0\n ? `

${thead}${activeRows}

`\n : '

No books tracked yet. Add some below.

';\n\n const hiddenSection = hidden.length > 0\n ? `

Hidden (${hidden.length})

${thead}${hiddenRows}

`\n : \"\";\n\n return `\n\n\n \n \n Book Deal Watcher\n \n\n\n

Book Deal Watcher

\n \n

\n ${table}\n ${hiddenSection}\n

Add a Book

\n \n

\n \n\n`;\n}\n\nexport default async function(req: Request): Promise {\n await ensureBooksTable();\n\n // One-time dedup: keep lowest price per ISBN per day, delete the rest\n await sqlite.execute(`\n DELETE FROM price_history WHERE id NOT IN (\n SELECT id FROM (\n SELECT id, ROW_NUMBER() OVER (\n PARTITION BY isbn, date(checked_at) ORDER BY price ASC\n ) AS rn FROM price_history\n ) WHERE rn = 1\n )\n `);\n\n const url = new URL(req.url);\n const path = url.pathname;\n\n // GET / — Dashboard\n if (req.method === \"GET\" && (path === \"/\" || path === \"\")) {\n const booksResult = await sqlite.execute(`SELECT isbn, title, price_threshold, archived, condition FROM books`);\n const books = booksResult.rows as unknown as Book[];\n\n const historyResult = await sqlite.execute(\n `SELECT isbn, price, checked_at FROM price_history ORDER BY checked_at ASC`,\n );\n const historyRows = historyResult.rows as unknown as PriceRecord[];\n\n const historyByIsbn = new Map();\n for (const h of historyRows) {\n let bucket = historyByIsbn.get(h.isbn);\n if (!bucket) {\n bucket = { prices: [], entries: [] };\n historyByIsbn.set(h.isbn, bucket);\n }\n bucket.prices.push(h.price);\n const d = new Date(h.checked_at + \"Z\");\n bucket.entries.push({ price: h.price, date: d.toLocaleDateString(\"en-US\", { month: \"short\", day: \"numeric\" }) });\n }\n\n const bookRows: BookRow[] = books.map((b) => {\n const bucket = historyByIsbn.get(b.isbn);\n const prices = bucket?.prices ?? [];\n const latestPrice = prices.length > 0 ? prices[prices.length - 1] : null;\n const prevPrice = prices.length >= 2 ? prices[prices.length - 2] : null;\n\n const lowestEver = prices.length > 0 ? Math.min(...prices) : null;\n const manualThreshold = b.price_threshold;\n let medianPrice: number | null = null;\n let alertThreshold: number | null = null;\n let isDeal = false;\n\n if (manualThreshold != null && latestPrice !== null) {\n alertThreshold = manualThreshold;\n isDeal = latestPrice <= manualThreshold;\n } else if (latestPrice !== null && latestPrice < 10) {\n isDeal = true;\n } else if (prices.length >= 1 && latestPrice !== null) {\n medianPrice = computeMedian(prices);\n alertThreshold = medianPrice * 0.69;\n isDeal = latestPrice <= alertThreshold;\n }\n\n return {\n isbn: b.isbn,\n title: b.title,\n latestPrice,\n medianPrice,\n lowestEver,\n alertThreshold,\n manualThreshold,\n prevPrice,\n isDeal,\n archived: b.archived === 1,\n condition: (b.condition as string) || \"both\",\n history: bucket?.entries ?? [],\n };\n });\n\n return new Response(html(bookRows), {\n headers: { \"Content-Type\": \"text/html\" },\n });\n }\n\n // GET /api/books\n if (req.method === \"GET\" && path === \"/api/books\") {\n const result = await sqlite.execute(`SELECT isbn, title FROM books`);\n return Response.json(result.rows);\n }\n\n // GET /api/price-history\n if (req.method === \"GET\" && path === \"/api/price-history\") {\n const result = await sqlite.execute(\n `SELECT ph.isbn, b.title, ph.price, ph.checked_at\n FROM price_history ph\n LEFT JOIN books b ON b.isbn = ph.isbn\n ORDER BY ph.isbn, ph.checked_at ASC`,\n );\n const rows = result.rows as unknown as { isbn: string; title: string; price: number; checked_at: string }[];\n\n const grouped: Record = {};\n for (const r of rows) {\n if (!grouped[r.isbn]) {\n grouped[r.isbn] = { title: r.title, history: [] };\n }\n grouped[r.isbn].history.push({ price: r.price, checked_at: r.checked_at });\n }\n\n return Response.json(grouped);\n }\n\n // POST /api/books — single book add/update, then auto-check price\n if (req.method === \"POST\" && path === \"/api/books\") {\n const { isbn, title, priceThreshold, condition } = await req.json();\n if (!isbn || !title) {\n return Response.json({ error: \"isbn and title are required\" }, { status: 400 });\n }\n const cond = condition || \"both\";\n await sqlite.execute(\n `INSERT OR REPLACE INTO books (isbn, title, price_threshold, condition) VALUES (?, ?, ?, ?)`,\n [isbn, title, priceThreshold ?? null, cond],\n );\n // Auto-check price so it's available immediately\n await checkSingleBook(isbn, cond);\n return Response.json({ ok: true });\n }\n\n // POST /api/books/check-all — refresh all active books\n if (req.method === \"POST\" && path === \"/api/books/check-all\") {\n const booksResult = await sqlite.execute(`SELECT isbn, condition FROM books WHERE archived = 0`);\n const books = booksResult.rows as unknown as { isbn: string; condition: string }[];\n for (const b of books) {\n await checkSingleBook(b.isbn, (b.condition as any) || \"both\");\n }\n return Response.json({ ok: true, count: books.length });\n }\n\n // POST /api/books/bulk — bulk import (API-only, no UI)\n if (req.method === \"POST\" && path === \"/api/books/bulk\") {\n const { books } = await req.json();\n if (!Array.isArray(books) || books.length === 0) {\n return Response.json({ error: \"books array is required\" }, { status: 400 });\n }\n let count = 0;\n for (const book of books) {\n if (!book.isbn || !book.title) continue;\n await sqlite.execute(\n `INSERT OR IGNORE INTO books (isbn, title, price_threshold) VALUES (?, ?, NULL)`,\n [book.isbn.trim(), book.title.trim()],\n );\n await checkSingleBook(book.isbn.trim());\n count++;\n }\n return Response.json({ ok: true, count });\n }\n\n // GET /api/isbn-lookup/:isbn — look up book title from Open Library\n if (req.method === \"GET\" && path.startsWith(\"/api/isbn-lookup/\")) {\n const isbn = decodeURIComponent(path.slice(\"/api/isbn-lookup/\".length)).replace(/[-\\s]/g, \"\");\n try {\n const resp = await fetch(`https://openlibrary.org/isbn/${isbn}.json`);\n if (resp.ok) {\n const data = await resp.json();\n return Response.json({ title: data.title || null });\n }\n return Response.json({ title: null });\n } catch {\n return Response.json({ title: null });\n }\n }\n\n // PATCH /api/books/:isbn/archive — hide/show a book\n if (req.method === \"PATCH\" && path.endsWith(\"/archive\") && path.startsWith(\"/api/books/\")) {\n const isbn = decodeURIComponent(path.slice(\"/api/books/\".length, -\"/archive\".length));\n const { archived } = await req.json();\n await sqlite.execute(`UPDATE books SET archived = ? WHERE isbn = ?`, [archived ? 1 : 0, isbn]);\n return Response.json({ ok: true });\n }\n\n // PATCH /api/books/:isbn/threshold — set or clear manual price threshold\n if (req.method === \"PATCH\" && path.endsWith(\"/threshold\") && path.startsWith(\"/api/books/\")) {\n const isbn = decodeURIComponent(path.slice(\"/api/books/\".length, -\"/threshold\".length));\n const { priceThreshold } = await req.json();\n await sqlite.execute(\n `UPDATE books SET price_threshold = ? WHERE isbn = ?`,\n [priceThreshold ?? null, isbn],\n );\n return Response.json({ ok: true });\n }\n\n // POST /api/books/:isbn/check — manually refresh price for a book\n if (req.method === \"POST\" && path.endsWith(\"/check\") && path.startsWith(\"/api/books/\")) {\n const isbn = decodeURIComponent(path.slice(\"/api/books/\".length, -\"/check\".length));\n const bookRow = await sqlite.execute({ sql: `SELECT condition FROM books WHERE isbn = ?`, args: [isbn] });\n const cond = bookRow.rows.length > 0 ? (bookRow.rows[0] as any).condition || \"both\" : \"both\";\n const price = await checkSingleBook(isbn, cond);\n return Response.json({ ok: true, price });\n }\n\n // DELETE /api/books/:isbn\n if (req.method === \"DELETE\" && path.startsWith(\"/api/books/\")) {\n const isbn = decodeURIComponent(path.slice(\"/api/books/\".length));\n await sqlite.execute(\n `DELETE FROM books WHERE isbn = ?`,\n [isbn],\n );\n return Response.json({ ok: true });\n }\n\n return Response.json({ error: \"Not found\" }, { status: 404 });\n}\n","label","dubin-used-books",[137],"4f1e4bee-11fe-11f1-9b96-42dde27851f2","digest.cron.ts","b8d56412-0c42-11f1-9959-42dde27851f2",43,["D",1771991937114],4,"import { email } from \"https://esm.town/v/std/email\";\nimport sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\nimport { ensureBooksTable, getBooks } from \"./books.ts\";\n\ninterface BookDigestEntry {\n title: string;\n isbn: string;\n lowestThisWeek: number | null;\n medianPrice: number | null;\n pctBelowMedian: number | null;\n isDeal: boolean;\n hasThreshold: boolean;\n priceThreshold: number | null;\n hitTarget: boolean;\n reason: string;\n}\n\nfunction computeMedian(prices: number[]): number {\n const sorted = [...prices].sort((a, b) => a - b);\n const mid = Math.floor(sorted.length / 2);\n return sorted.length % 2 === 0\n ? (sorted[mid - 1] + sorted[mid]) / 2\n : sorted[mid];\n}\n\nexport async function main() {\n console.log(\"Running weekly digest...\");\n await ensureBooksTable();\n\n // Get lowest price this week per book\n const weekResult = await sqlite.execute(`\n SELECT isbn, MIN(price) as min_price\n FROM price_history\n WHERE checked_at >= datetime('now', '-7 days')\n GROUP BY isbn\n `);\n\n const weekPricesByIsbn = new Map();\n for (const row of weekResult.rows) {\n weekPricesByIsbn.set(row.isbn as string, row.min_price as number);\n }\n\n const books = await getBooks();\n const entries: BookDigestEntry[] = [];\n\n for (const book of books) {\n const lowestThisWeek = weekPricesByIsbn.get(book.isbn) ?? null;\n\n // Get full price history for median calculation\n const histResult = await sqlite.execute({\n sql: `SELECT price FROM price_history WHERE isbn = ? ORDER BY checked_at ASC`,\n args: [book.isbn],\n });\n const allPrices = histResult.rows.map((r) => r.price as number);\n\n let medianPrice: number | null = null;\n let pctBelowMedian: number | null = null;\n let isDeal = false;\n let reason = \"\";\n\n if (allPrices.length >= 5 && lowestThisWeek != null) {\n medianPrice = computeMedian(allPrices);\n pctBelowMedian = ((medianPrice - lowestThisWeek) / medianPrice) * 100;\n\n const mean = allPrices.reduce((s, p) => s + p, 0) / allPrices.length;\n const variance = allPrices.reduce((s, p) => s + (p - mean) ** 2, 0) / allPrices.length;\n const stddev = Math.sqrt(variance);\n\n const statsThreshold = medianPrice - 1.5 * stddev;\n const halfMedian = medianPrice * 0.5;\n const dealThreshold = Math.max(statsThreshold, halfMedian);\n\n isDeal = lowestThisWeek <= dealThreshold;\n reason = isDeal\n ? `${pctBelowMedian.toFixed(0)}% below median`\n : \"Normal price range\";\n } else if (lowestThisWeek != null && lowestThisWeek < 5) {\n isDeal = true;\n reason = \"Under $5 — automatic deal\";\n } else if (allPrices.length < 5) {\n reason = `Gathering data (${allPrices.length}/5 checks)`;\n } else {\n reason = \"No price data this week\";\n }\n\n // Threshold-based logic for books with explicit targets\n const hasThreshold = book.priceThreshold != null;\n const hitTarget = hasThreshold && lowestThisWeek != null\n ? lowestThisWeek <= book.priceThreshold!\n : false;\n\n entries.push({\n title: book.title,\n isbn: book.isbn,\n lowestThisWeek,\n medianPrice,\n pctBelowMedian,\n isDeal: isDeal || hitTarget,\n hasThreshold,\n priceThreshold: book.priceThreshold,\n hitTarget,\n reason,\n });\n }\n\n // Only include books with interesting activity (deals, target hits, or significant price movement)\n const interestingEntries = entries.filter((e) => {\n if (e.isDeal || e.hitTarget) return true;\n // Include if price dropped notably below median (even if not a \"deal\")\n if (e.pctBelowMedian != null && e.pctBelowMedian > 10) return true;\n return false;\n });\n\n const dealCount = entries.filter((e) => e.isDeal).length;\n\n const lines: string[] = [];\n\n if (interestingEntries.length === 0) {\n lines.push(\"No notable deals or price movements this week.\");\n lines.push(`Tracking ${entries.length} books.`);\n lines.push(\"\");\n }\n\n for (const e of interestingEntries) {\n const searchUrl = `https://www.bookfinder.com/search/?isbn=${e.isbn}&mode=isbn&st=sr&ac=qr`;\n const marker = e.isDeal ? \"!!!\" : \" \";\n\n lines.push(`${marker} ${e.title} (ISBN: ${e.isbn})`);\n\n if (e.lowestThisWeek != null) {\n lines.push(` Lowest this week: $${e.lowestThisWeek.toFixed(2)}`);\n } else {\n lines.push(` No price data this week`);\n }\n\n if (e.medianPrice != null) {\n lines.push(` Median price: $${e.medianPrice.toFixed(2)}`);\n }\n\n if (e.pctBelowMedian != null && e.pctBelowMedian > 0) {\n lines.push(` ${e.pctBelowMedian.toFixed(0)}% below median`);\n }\n\n if (e.hasThreshold) {\n lines.push(` Target: $${e.priceThreshold!.toFixed(2)} ${e.hitTarget ? \"— HIT!\" : \"\"}`);\n }\n\n lines.push(` ${e.reason}`);\n lines.push(` Search: ${searchUrl}`);\n lines.push(\"\");\n }\n\n // Summary footer\n const gatheringData = entries.filter((e) => e.medianPrice == null && !e.isDeal).length;\n if (gatheringData > 0) {\n lines.push(`(${gatheringData} books still gathering price data)`);\n }\n\n const subject = dealCount > 0\n ? `Weekly Book Deals - ${dealCount} deal${dealCount === 1 ? \"\" : \"s\"} found!`\n : \"Weekly Book Deals\";\n\n await email({\n subject,\n text: `Weekly Book Deals\\n${\"=\".repeat(40)}\\n\\n${lines.join(\"\\n\")}`,\n });\n\n console.log(\"Digest email sent!\");\n}\n",[150],"b8e88e52-0c42-11f1-9d3d-42dde27851f2","deno.json","b8e88f1a-0c42-11f1-9d3d-42dde27851f2",22,["D",1771361613309],0,"{\n \"$schema\": \"https://raw.githubusercontent.com/denoland/deno/98f62cee78e85bfc47c62ed703777c6bc8794f1c/cli/schemas/config-file.v1.json\",\n \"lock\": false,\n \"compilerOptions\": {\n \"noImplicitAny\": false,\n \"strict\": true,\n \"types\": [\"https://www.val.town/types/valtown.d.ts\"],\n \"lib\": [\n \"dom\",\n \"dom.iterable\",\n \"dom.asynciterable\",\n \"deno.ns\",\n \"deno.unstable\"\n ]\n },\n \"lint\": {\n \"include\": [\"deno:/https/esm.town/**/*\"],\n \"rules\": {\n \"exclude\": [\"no-explicit-any\"]\n }\n },\n \"node_modules_dir\": false,\n \"experimental\": {\n \"unstable-node-globals\": true,\n \"unstable-temporal\": true,\n \"unstable-worker-options\": true,\n \"unstable-sloppy-imports\": true\n }\n}",[158],"379ab8b8-1906-11f1-a516-42dde27851f2",["D",1772764991840],36,[28],"a2d69074-12ae-11f1-b427-42dde27851f2","books.ts","b8ff597a-0c42-11f1-b2fa-42dde27851f2",83,["D",1772067668988],9,"script","import sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\n\nexport type BookCondition = \"both\" | \"used\" | \"new\";\n\nexport interface Book {\n isbn: string;\n title: string;\n priceThreshold: number | null;\n condition: BookCondition;\n}\n\nexport async function ensureBooksTable() {\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS books (\n isbn TEXT PRIMARY KEY,\n title TEXT NOT NULL,\n price_threshold REAL\n )\n `);\n // Add columns if they don't exist\n try { await sqlite.execute(`ALTER TABLE books ADD COLUMN archived INTEGER NOT NULL DEFAULT 0`); } catch {}\n try { await sqlite.execute(`ALTER TABLE books ADD COLUMN condition TEXT NOT NULL DEFAULT 'both'`); } catch {}\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS price_history (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n isbn TEXT NOT NULL,\n price REAL NOT NULL,\n checked_at TEXT NOT NULL DEFAULT (datetime('now'))\n )\n `);\n}\n\nexport async function getBooks(): Promise {\n const result = await sqlite.execute(`SELECT isbn, title, price_threshold, condition FROM books`);\n return result.rows.map((row) => ({\n isbn: row.isbn as string,\n title: row.title as string,\n priceThreshold: row.price_threshold as number | null,\n condition: (row.condition as BookCondition) || \"both\",\n }));\n}\n",[170],"b8c7d14e-0c42-11f1-bab7-42dde27851f2","AGENTS.md","b8c7d20c-0c42-11f1-bab7-42dde27851f2",19,["D",1771361613259],"You are an advanced assistant specialized in generating Val Town code.\n\n## Core Guidelines\n\n- Ask clarifying questions when requirements are ambiguous\n- Provide complete, functional solutions rather than skeleton implementations\n- Test your logic against edge cases before presenting the final solution\n- Ensure all code follows Val Town's specific platform requirements\n- If a section of code that you're working on is getting too complex, consider refactoring it into subcomponents\n\n## Code Standards\n\n- Generate code in TypeScript or TSX\n- Add appropriate TypeScript types and interfaces for all data structures\n- Prefer official SDKs or libraries than writing API calls directly\n- Ask the user to supply API or library documentation if you are at all unsure about it\n- **Never bake in secrets into the code** - always use environment variables\n- Include comments explaining complex logic (avoid commenting obvious operations)\n- Follow modern ES6+ conventions and functional programming practices if possible\n\n## Types of triggers\n\n### 1. HTTP Trigger\n\n- Create web APIs and endpoints\n- Handle HTTP requests and responses\n- Example structure:\n\n```ts\nexport default async function (req: Request) {\n return new Response(\"Hello World\");\n}\n```\n\nFiles that are HTTP triggers have http in their name like `foobar.http.tsx`\n\n### 2. Cron Triggers\n\n- Run on a schedule\n- Use cron expressions for timing\n- Example structure:\n\n```ts\nexport default async function () {\n // Scheduled task code\n}\n```\n\nFiles that are Cron triggers have cron in their name like `foobar.cron.tsx`\n\n### 3. Email Triggers\n\n- Process incoming emails\n- Handle email-based workflows\n- Example structure:\n\n```ts\nexport default async function (email: Email) {\n // Process email\n}\n```\n\nFiles that are Email triggers have email in their name like `foobar.email.tsx`\n\n\n## Val Town Standard Libraries\n\nVal Town provides several hosted services and utility functions.\n\n### Blob Storage\n\n```ts\nimport { blob } from \"https://esm.town/v/std/blob\";\nawait blob.setJSON(\"myKey\", { hello: \"world\" });\nlet blobDemo = await blob.getJSON(\"myKey\");\nlet appKeys = await blob.list(\"app_\");\nawait blob.delete(\"myKey\");\n```\n\n### SQLite\n\n```ts\nimport { sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\nconst TABLE_NAME = 'todo_app_users_2';\n// Create table - do this before usage and change table name when modifying schema\nawait sqlite.execute(`CREATE TABLE IF NOT EXISTS ${TABLE_NAME} (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n name TEXT NOT NULL\n)`);\n// Query data\nconst result = await sqlite.execute(`SELECT * FROM ${TABLE_NAME} WHERE id = ?`, [1]);\n```\n\nNote: When changing a SQLite table's schema, change the table's name (e.g., add _2 or _3) to create a fresh table.\n\n### OpenAI\n\n```ts\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\nconst openai = new OpenAI();\nconst completion = await openai.chat.completions.create({\n messages: [\n { role: \"user\", content: \"Say hello in a creative way\" },\n ],\n model: \"gpt-4o-mini\",\n max_tokens: 30,\n});\n```\n\n### Email\n\n```ts\nimport { email } from \"https://esm.town/v/std/email\";\n// By default emails the owner of the val\nawait email({ \n subject: \"Hi\", \n text: \"Hi\", \n html: \"

Hi

\"\n});\n```\n\n## Val Town Utility Functions\n\nVal Town provides several utility functions to help with common project tasks.\n\n### Importing Utilities\n\nAlways import utilities with version pins to avoid breaking changes:\n\n```ts\nimport { parseProject, readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n```\n\n### Available Utilities\n\n\n#### **serveFile** - Serve project files with proper content types\n\nFor example, in Hono:\n\n```ts\n// serve all files in frontend/ and shared/\napp.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\napp.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n```\n\n#### **readFile** - Read files from within the project:\n\n```ts\n// Read a file from the project\nconst fileContent = await readFile(\"/frontend/index.html\", import.meta.url);\n```\n\n#### **listFiles** - List all files in the project\n\n```ts\nconst files = await listFiles(import.meta.url);\n```\n\n#### **parseProject** - Extract information about the current project from import.meta.url\n\nThis is useful for including info for linking back to a val, ie in \"view source\" urls:\n\n```ts\nconst projectVal = parseProject(import.meta.url);\nconsole.log(projectVal.username); // Owner of the project\nconsole.log(projectVal.name); // Project name\nconsole.log(projectVal.version); // Version number\nconsole.log(projectVal.branch); // Branch name\nconsole.log(projectVal.links.self.project); // URL to the project page\n```\n\nHowever, it's *extremely importing* to note that `parseProject` and other Standard Library utilities ONLY RUN ON THE SERVER.\nIf you need access to this data on the client, run it in the server and pass it to the client by splicing it into the HTML page\nor by making an API request for it.\n\n## Val Town Platform Specifics\n\n- **Redirects:** Use `return new Response(null, { status: 302, headers: { Location: \"/place/to/redirect\" }})` instead of `Response.redirect` which is broken\n- **Images:** Avoid external images or base64 images. Use emojis, unicode symbols, or icon fonts/libraries instead\n- **AI Image:** To inline generate an AI image use: `

`\n- **Storage:** DO NOT use the Deno KV module for storage\n- **Browser APIs:** DO NOT use the `alert()`, `prompt()`, or `confirm()` methods\n- **Weather Data:** Use open-meteo for weather data (doesn't require API keys) unless otherwise specified\n- **View Source:** Add a view source link by importing & using `import.meta.url.replace(\"ems.sh\", \"val.town)\"` (or passing this data to the client) and include `target=\"_top\"` attribute\n- **Error Debugging:** Add `` to HTML to capture client-side errors\n- **Error Handling:** Only use try...catch when there's a clear local resolution; Avoid catches that merely log or return 500s. Let errors bubble up with full context\n- **Environment Variables:** Use `Deno.env.get('keyname')` when you need to, but generally prefer APIs that don't require keys\n- **Imports:** Use `https://esm.sh` for npm and Deno dependencies to ensure compatibility on server and browser\n- **Storage Strategy:** Only use backend storage if explicitly required; prefer simple static client-side sites\n- **React Configuration:** When using React libraries, pin versions with `?deps=react@18.2.0,react-dom@18.2.0` and start the file with `/** @jsxImportSource https://esm.sh/react@18.2.0 */`\n- Ensure all React dependencies and sub-dependencies are pinned to the same version\n- **Styling:** Default to using TailwindCSS via `` unless otherwise specified\n\n## Project Structure and Design Patterns\n\n### Recommended Directory Structure\n```\n├── backend/\n│ ├── database/\n│ │ ├── migrations.ts # Schema definitions\n│ │ ├── queries.ts # DB query functions\n│ │ └── README.md\n│ └── routes/ # Route modules\n│ ├── [route].ts\n│ └── static.ts # Static file serving\n│ ├── index.ts # Main entry point\n│ └── README.md\n├── frontend/\n│ ├── components/\n│ │ ├── App.tsx\n│ │ └── [Component].tsx\n│ ├── favicon.svg\n│ ├── index.html # Main HTML template\n│ ├── index.tsx # Frontend JS entry point\n│ ├── README.md\n│ └── style.css\n├── README.md\n└── shared/\n ├── README.md\n └── utils.ts # Shared types and functions\n```\n\n### Backend (Hono) Best Practices\n\n- Hono is the recommended API framework\n- Main entry point should be `backend/index.ts`\n- **Static asset serving:** Use the utility functions to read and serve project files:\n ```ts\n import { readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n \n // serve all files in frontend/ and shared/\n app.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\n app.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n \n // For index.html, often you'll want to bootstrap with initial data\n app.get(\"/\", async c => {\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n \n // Inject data to avoid extra round-trips\n const initialData = await fetchInitialData();\n const dataScript = ``;\n \n html = html.replace(\"\", `${dataScript}`);\n return c.html(html);\n });\n ```\n- Create RESTful API routes for CRUD operations\n- Always include this snippet at the top-level Hono app to re-throwing errors to see full stack traces:\n ```ts\n // Unwrap Hono errors to see original error details\n app.onError((err, c) => {\n throw err;\n });\n ```\n\n### Database Patterns\n- Run migrations on startup or comment out for performance\n- Change table names when modifying schemas rather than altering\n- Export clear query functions with proper TypeScript typing\n\n## Common Gotchas and Solutions\n\n1. **Environment Limitations:** \n - Val Town runs on Deno in a serverless context, not Node.js\n - Code in `shared/` must work in both frontend and backend environments\n - Cannot use `Deno` keyword in shared code\n - Use `https://esm.sh` for imports that work in both environments\n\n2. **SQLite Peculiarities:**\n - Limited support for ALTER TABLE operations\n - Create new tables with updated schemas and copy data when needed\n - Always run table creation before querying\n\n3. **React Configuration:**\n - All React dependencies must be pinned to 18.2.0\n - Always include `@jsxImportSource https://esm.sh/react@18.2.0` at the top of React files\n - Rendering issues often come from mismatched React versions\n\n4. **File Handling:**\n - Val Town only supports text files, not binary\n - Use the provided utilities to read files across branches and forks\n - For files in the project, use `readFile` helpers\n\n5. **API Design:**\n - `fetch` handler is the entry point for HTTP vals\n - Run the Hono app with `export default app.fetch // This is the entry point for HTTP 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\"permissions\": {\n \"allow\": [\n \"WebFetch(domain:www.bookfinder.com)\",\n \"Bash(vt:*)\",\n \"Bash(grep:*)\",\n \"Bash(command -v:*)\",\n \"Bash(xargs:*)\",\n \"Bash(curl -s -H \\\"User-Agent: Mozilla/5.0 \\\$Macintosh; Intel Mac OS X 10_15_7\\\$ AppleWebKit/537.36\\\" \\\"https://www.bookfinder.com/search/?isbn=9780143127550&mode=isbn&st=sr&ac=qr\\\" | head -500)\",\n \"Bash(which val && val --help 2>&1 | head -20 || echo \\\"val CLI not found\\\")\",\n \"Bash(which npx && npx @valtown/vt --help 2>&1 | head -20 || true)\",\n \"Bash(curl:*)\",\n \"Bash(node:*)\"\n ]\n 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Diff · v100