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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(\"\", `${dataScript}`);\n return c.html(html);\n });\n ```\n- Create RESTful API routes for CRUD operations\n- Always include this snippet at the top-level Hono app to re-throwing errors to see full stack traces:\n ```ts\n // Unwrap Hono errors to see original error details\n app.onError((err, c) => {\n throw err;\n });\n ```\n\n### Database Patterns\n- Run migrations on startup or comment out for performance\n- Change table names when modifying schemas rather than altering\n- Export clear query functions with proper TypeScript typing\n\n## Common Gotchas and Solutions\n\n1. **Environment Limitations:** \n - Val Town runs on Deno in a serverless context, not Node.js\n - Code in `shared/` must work in both frontend and backend environments\n - Cannot use `Deno` keyword in shared code\n - Use `https://esm.sh` for imports that work in both environments\n\n2. **SQLite Peculiarities:**\n - Limited support for ALTER TABLE operations\n - Create new tables with updated schemas and copy data when needed\n - Always run table creation before querying\n\n3. **React Configuration:**\n - All React dependencies must be pinned to 18.2.0\n - Always include `@jsxImportSource https://esm.sh/react@18.2.0` at the top of React files\n - Rendering issues often come from mismatched React versions\n\n4. **File Handling:**\n - Val Town only supports text files, not binary\n - Use the provided utilities to read files across branches and forks\n - For files in the project, use `readFile` helpers\n\n5. **API Design:**\n - `fetch` handler is the entry point for HTTP vals\n - Run the Hono app with `export default app.fetch // This is the entry point for HTTP 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const TESTDATA_COLLECTION = \"org.newtoncivic.atproto.testdata\" as const;\n\nexport const TESTDATA_LEXICON = `{\n \"$schema\": \"https://lexicon.atproto.com/schema.json\",\n \"lexicon\": 1,\n \"id\": \"org.newtoncivic.atproto.testdata\",\n \"defs\": {\n \"main\": {\n \"type\": \"record\",\n \"key\": \"tid\",\n \"record\": {\n \"type\": \"object\",\n \"description\": \"Demo record for publishing structured telemetry readings to Bluesky.\",\n \"required\": [\n \"createdAt\",\n \"schemaVersion\",\n \"label\",\n \"value\"\n ],\n \"properties\": {\n \"createdAt\": {\n \"type\": \"datetime\",\n \"description\": \"ISO8601 timestamp for when this reading was created.\"\n },\n \"schemaVersion\": {\n \"type\": \"integer\",\n \"minimum\": 1,\n \"description\": \"Schema version of the payload to allow evolution over time.\"\n },\n \"label\": {\n \"type\": \"string\",\n \"maxLength\": 128,\n \"description\": \"Short identifier for the kind of reading.\"\n },\n \"value\": {\n \"type\": \"number\",\n \"description\": \"Numeric reading captured for the label.\"\n },\n \"unit\": {\n \"type\": \"string\",\n \"maxLength\": 16,\n \"description\": \"Optional unit describing the numeric value (e.g. %, ms, C).\"\n },\n \"notes\": {\n \"type\": \"string\",\n \"maxLength\": 512,\n \"description\": \"Optional human readable context for this reading.\"\n },\n \"metadata\": {\n \"type\": \"ref\",\n \"ref\": \"lex:com.atproto.repo.strongRef\",\n \"description\": \"Optional pointer to a related record for richer correlation.\"\n }\n }\n }\n }\n }\n}`;\n\nexport interface TestDataRecord {\n $type: typeof TESTDATA_COLLECTION;\n createdAt: string;\n schemaVersion: number;\n label: string;\n value: number;\n unit?: string;\n notes?: string;\n metadata?: {\n cid: string;\n uri: string;\n };\n}\n\nexport interface CreateTestDataInput {\n label: string;\n value: number;\n unit?: string;\n notes?: string;\n metadata?: {\n cid: string;\n uri: string;\n };\n}\n\nexport function 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ensureTestDataTable,\n listRecentTestData,\n TESTDATA_TABLE,\n} from \"./database/queries.ts\";\n\nconst DEFAULT_LIMIT = 20;\n\nconst app = new Hono();\n\n// Unwrap Hono errors so Deno surfaces full stack traces in logs\napp.onError((err) => {\n throw err;\n});\n\napp.get(\"/data.json\", async (c) => {\n await ensureTestDataTable();\n const limit = getLimitFromRequest(c.req.query(\"limit\"));\n const rows = await listRecentTestData(limit);\n return c.json({\n table: TESTDATA_TABLE,\n limit,\n count: rows.length,\n rows,\n });\n});\n\napp.get(\"/\", async (c) => {\n await ensureTestDataTable();\n const limit = getLimitFromRequest(c.req.query(\"limit\"));\n const rows = await listRecentTestData(limit);\n const viewSourceUrl = import.meta.url.replace(\"ems.sh\", \"val.town\");\n const body = renderHtml({ rows, limit, viewSourceUrl });\n return c.html(body);\n});\n\nfunction getLimitFromRequest(limitParam: string | undefined): number {\n const limit = Number(limitParam ?? DEFAULT_LIMIT);\n if (!Number.isFinite(limit) || limit <= 0) {\n return DEFAULT_LIMIT;\n }\n return Math.min(Math.floor(limit), 200);\n}\n\ninterface RenderHtmlParams {\n rows: Awaited>;\n limit: number;\n viewSourceUrl: string;\n}\n\nfunction renderHtml({ rows, limit, viewSourceUrl }: RenderHtmlParams): string {\n const rowsMarkup = rows\n .map((row) => {\n const record = JSON.stringify(row.record, null, 2);\n return `

#${row.cursor} ${escapeHtml(row.record.label)} — ${new Date(row.record.createdAt).toLocaleString()} (${row.repo})

${escapeHtml(record)}

repo: ${escapeHtml(row.repo)}
collection: ${escapeHtml(row.collection)}
rkey: ${escapeHtml(row.rkey)}
event time: ${escapeHtml(row.eventTime)}
received at: ${escapeHtml(row.receivedAt)}

`;\n })\n .join(\"\\n\");\n\n return `\n\n \n \n \n \n Bluesky Test Data Feed\n \n \n \n \n

org.newtoncivic Test Data Feed

Showing up to ${limit} most recent records saved from Jetstream.

\n \n

\n ${rows.length ? rowsMarkup : \"

No records found yet.

\"}\n

\n \n`;\n}\n\nfunction escapeHtml(value: string): string {\n return value\n .replace(/&/g, \"&\")\n .replace(//g, \">\")\n .replace(/\"/g, \""\")\n .replace(/'/g, \"'\");\n}\n\nexport default app.fetch;\n",[],[148,193],"b3d03142-a3f4-11f0-8e27-0224a6c84d84","jetstreamAppview.cron.ts","b3d031f6-a3f4-11f0-8e27-0224a6c84d84",6,["D",1759893183243],"interval","import { BskyAgent } from \"https://esm.sh/@atproto/api@0.13.18?target=deno\";\nimport { TESTDATA_COLLECTION, TestDataRecord } from \"../shared/atprotoTestData.ts\";\nimport {\n ensureTestDataTable,\n getLatestCursor,\n insertTestDataRow,\n TESTDATA_TABLE,\n} from \"./database/queries.ts\";\n\nconst JETSTREAM_URL = Deno.env.get(\"JETSTREAM_URL\") ?? \"https://jetstream.atproto.tools/subscribe\";\nconst APPVIEW_SERVICE_URL = Deno.env.get(\"BLUESKY_SERVICE_URL\") ?? \"https://bsky.social\";\nconst STREAM_TIMEOUT_MS = Number(Deno.env.get(\"JETSTREAM_TIMEOUT_MS\") ?? 15000);\nconst MAX_STREAM_EVENTS = Number(Deno.env.get(\"JETSTREAM_MAX_EVENTS\") ?? 64);\nconst REPLAY_MARGIN = Number(Deno.env.get(\"JETSTREAM_REPLAY_MARGIN\") ?? 5);\n\ninterface JetstreamMessage {\n kind: string;\n seq: number;\n time: string;\n repo?: string;\n commit?: {\n rev: string;\n time: string;\n };\n operations?: Array<{\n action: \"create\" | \"update\" | \"delete\";\n path: string;\n cid?: string;\n }>;\n}\n\ninterface StreamState {\n processedOps: number;\n storedEvents: number;\n highestCursor?: number;\n}\n\nconst decoder = new TextDecoder();\n\nexport default async function jetstreamCron(): Promise {\n await ensureTestDataTable();\n const latestCursor = await getLatestCursor();\n const startCursor = typeof latestCursor === \"number\" ? Math.max(latestCursor - REPLAY_MARGIN, 0) : undefined;\n\n const agent = new BskyAgent({ service: APPVIEW_SERVICE_URL });\n const state: StreamState = {\n processedOps: 0,\n storedEvents: 0,\n highestCursor: startCursor,\n };\n\n await processJetstream({ agent, startCursor, state });\n\n console.log(\n JSON.stringify(\n {\n event: \"jetstream.sync\",\n table: TESTDATA_TABLE,\n startCursor,\n lastCursor: state.highestCursor ?? startCursor ?? null,\n processedOps: state.processedOps,\n storedEvents: state.storedEvents,\n },\n null,\n 2,\n ),\n );\n}\n\nasync function processJetstream({\n agent,\n startCursor,\n state,\n}: {\n agent: BskyAgent;\n startCursor?: number;\n state: StreamState;\n}): Promise {\n const url = new URL(JETSTREAM_URL);\n if (typeof startCursor === \"number\" && startCursor > 0) {\n url.searchParams.set(\"cursor\", startCursor.toString());\n }\n\n const controller = new AbortController();\n const timeout = setTimeout(() => controller.abort(\"stream timeout\"), STREAM_TIMEOUT_MS);\n\n const response = await fetch(url.toString(), {\n signal: controller.signal,\n headers: { Accept: \"text/event-stream\" },\n });\n\n if (!response.ok) {\n clearTimeout(timeout);\n throw new Error(`Jetstream request failed with status ${response.status}`);\n }\n if (!response.body) {\n clearTimeout(timeout);\n throw new Error(\"Jetstream response missing body\");\n }\n\n const reader = response.body.getReader();\n let buffer = \"\";\n\n try {\n while (!controller.signal.aborted) {\n const { value, done } = await reader.read();\n if (done) {\n break;\n }\n buffer += decoder.decode(value, { stream: true });\n let separatorIndex = buffer.indexOf(\"\\n\\n\");\n while (separatorIndex !== -1) {\n const rawEvent = buffer.slice(0, separatorIndex).trim();\n buffer = buffer.slice(separatorIndex + 2);\n await handleSseChunk(rawEvent, agent, state);\n if (state.processedOps >= MAX_STREAM_EVENTS) {\n controller.abort(\"reached max events\");\n break;\n }\n separatorIndex = buffer.indexOf(\"\\n\\n\");\n }\n }\n } catch (error) {\n if (!controller.signal.aborted) {\n console.error(\"Jetstream processing error\", error);\n throw error;\n }\n } finally {\n clearTimeout(timeout);\n controller.abort();\n await reader.cancel();\n }\n}\n\nasync function handleSseChunk(chunk: string, agent: BskyAgent, state: StreamState): Promise {\n if (!chunk) {\n return;\n }\n const lines = chunk.split(\"\\n\");\n let dataPayload = \"\";\n for (const line of lines) {\n if (line.startsWith(\":\")) {\n continue;\n }\n if (line.startsWith(\"data:\")) {\n dataPayload += line.replace(/^data:\\s?/, \"\");\n }\n }\n if (!dataPayload) {\n return;\n }\n let message: JetstreamMessage;\n try {\n message = JSON.parse(dataPayload) as JetstreamMessage;\n } catch (error) {\n console.error(\"Failed to parse Jetstream payload\", error);\n return;\n }\n if (message.kind !== \"commit\" || !message.repo || !message.operations) {\n return;\n }\n\n const relevantOps = message.operations.filter((op) => op.path.startsWith(`${TESTDATA_COLLECTION}/`));\n if (!relevantOps.length) {\n return;\n }\n\n const now = new Date().toISOString();\n for (const op of relevantOps) {\n const [, rkey] = op.path.split(\"/\");\n if (!rkey) {\n continue;\n }\n state.processedOps += 1;\n state.highestCursor = Math.max(state.highestCursor ?? 0, message.seq);\n if (op.action === \"delete\") {\n continue;\n }\n try {\n const recordResponse = await agent.com.atproto.repo.getRecord({\n repo: message.repo,\n collection: TESTDATA_COLLECTION,\n rkey,\n });\n const record = recordResponse.value as TestDataRecord;\n if (record.$type !== TESTDATA_COLLECTION) {\n continue;\n }\n await insertTestDataRow({\n cursor: message.seq,\n repo: message.repo,\n collection: TESTDATA_COLLECTION,\n rkey,\n record,\n eventTime: message.time,\n receivedAt: now,\n });\n state.storedEvents += 1;\n } catch (error) {\n console.error(\"Failed to fetch record for op\", { op, error });\n }\n }\n}\n",[],[148,202],"b3c4dfea-a3f4-11f0-8e27-0224a6c84d84","queries.ts","b3c4e0d0-a3f4-11f0-8e27-0224a6c84d84","b3b16122-a3f4-11f0-b878-0224a6c84d84",4,["D",1759893183181],"import { sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\nimport { TESTDATA_COLLECTION, TestDataRecord } from \"../../shared/atprotoTestData.ts\";\n\nexport const TESTDATA_TABLE = \"atproto_test_data\";\n\nexport interface StoredTestDataRow {\n cursor: number;\n repo: string;\n collection: string;\n rkey: string;\n record: TestDataRecord;\n eventTime: string;\n receivedAt: string;\n}\n\nexport async function ensureTestDataTable(): Promise {\n await sqlite.execute(`CREATE TABLE IF NOT EXISTS ${TESTDATA_TABLE} (\n cursor INTEGER PRIMARY KEY,\n repo TEXT NOT NULL,\n collection TEXT NOT NULL,\n rkey TEXT NOT NULL,\n record_json TEXT NOT NULL,\n event_time TEXT NOT NULL,\n received_at TEXT NOT NULL\n )`);\n await sqlite.execute(`CREATE INDEX IF NOT EXISTS idx_${TESTDATA_TABLE}_collection ON ${TESTDATA_TABLE}(collection)`);\n}\n\nexport async function getLatestCursor(): Promise {\n const result = await sqlite.execute(`SELECT MAX(cursor) as cursor FROM ${TESTDATA_TABLE}`);\n const row = (result.rows?.[0] ?? {}) as { cursor?: number | null };\n return typeof row.cursor === \"number\" ? row.cursor : null;\n}\n\nexport async function insertTestDataRow(row: StoredTestDataRow): Promise {\n await sqlite.execute(\n `INSERT OR IGNORE INTO ${TESTDATA_TABLE} (cursor, repo, collection, rkey, record_json, event_time, received_at)\n VALUES (?, ?, ?, ?, ?, ?, ?)`,\n [\n row.cursor,\n row.repo,\n row.collection,\n row.rkey,\n JSON.stringify(row.record),\n row.eventTime,\n row.receivedAt,\n ],\n );\n}\n\nexport async function listRecentTestData(limit = 20): Promise {\n const result = await sqlite.execute(\n `SELECT cursor, repo, collection, rkey, record_json, event_time, received_at\n FROM ${TESTDATA_TABLE}\n WHERE collection = ?\n ORDER BY cursor DESC\n LIMIT ?`,\n [TESTDATA_COLLECTION, limit],\n );\n\n return (result.rows ?? []).map((row) => ({\n cursor: Number(row.cursor),\n repo: String(row.repo),\n collection: String(row.collection),\n rkey: String(row.rkey),\n record: JSON.parse(String(row.record_json)) as TestDataRecord,\n eventTime: String(row.event_time),\n receivedAt: String(row.received_at),\n }));\n}\n",[],[148,219,211],"database","b3b16078-a3f4-11f0-b878-0224a6c84d84",["D",1759893183054],[166],[148,219],["D",1759893182834],[165,167,168],[148],["D",1759843843402],{"_94":93,"_101":97},{"_94":93,"_95":-5,"_96":97,"_18":52,"_98":99,"_100":24},{"_13":83,"_31":84,"_40":39,"_85":41,"_86":-5,"_87":-5,"_88":-5,"_89":-5,"_90":-5,"_91":42,"_92":93},"ctx",{"_76":-5,"_120":264,"_265":266,"_267":268,"_269":24,"_270":24,"_271":24,"_272":56,"_273":-5,"_274":-7,"_275":-7,"_276":60,"_277":24,"_278":24,"_279":-5,"_280":24,"_281":24,"_282":24,"_283":-5},"ENV",{"_235":236,"_237":238,"_239":84,"_240":241,"_242":243,"_244":245,"_246":247,"_248":249,"_250":251,"_252":253,"_254":255,"_256":257,"_258":259,"_260":261,"_262":263},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","5015b8df46402d8bba4f485ecc37aec202b0e06b","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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