update skills

2026-03-21 06:11:27 -07:00 · 2026-03-17 16:53:22 -07:00
parent 0b0783ef8e
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--- a/.agents/skills/cloudflare-deploy/references/hyperdrive/README.md
+++ b/.agents/skills/cloudflare-deploy/references/hyperdrive/README.md
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+# Hyperdrive
+
+Accelerates database queries from Workers via connection pooling, edge setup, query caching.
+
+## Key Features
+
+- **Connection Pooling**: Persistent connections eliminate TCP/TLS/auth handshakes (~7 round-trips)
+- **Edge Setup**: Connection negotiation at edge, pooling near origin
+- **Query Caching**: Auto-cache non-mutating queries (default 60s TTL)
+- **Support**: PostgreSQL, MySQL + compatibles (CockroachDB, Timescale, PlanetScale, Neon, Supabase)
+
+## Architecture
+
+```
+Worker → Edge (setup) → Pool (near DB) → Origin
+         ↓ cached reads
+         Cache
+```
+
+## Quick Start
+
+```bash
+# Create config
+npx wrangler hyperdrive create my-db \
+  --connection-string="postgres://user:pass@host:5432/db"
+
+# wrangler.jsonc
+{
+  "compatibility_flags": ["nodejs_compat"],
+  "hyperdrive": [{"binding": "HYPERDRIVE", "id": "<ID>"}]
+}
+```
+
+```typescript
+import { Client } from "pg";
+
+export default {
+  async fetch(req: Request, env: Env): Promise<Response> {
+    const client = new Client({
+      connectionString: env.HYPERDRIVE.connectionString,
+    });
+    await client.connect();
+    const result = await client.query("SELECT * FROM users WHERE id = $1", [123]);
+    await client.end();
+    return Response.json(result.rows);
+  },
+};
+```
+
+## When to Use
+
+✅ Global access to single-region DBs, high read ratios, popular queries, connection-heavy loads
+❌ Write-heavy, real-time data (<1s), single-region apps close to DB
+
+**💡 Pair with Smart Placement** for Workers making multiple queries - executes near DB to minimize latency.
+
+## Driver Choice
+
+| Driver | Use When | Notes |
+|--------|----------|-------|
+| **pg** (recommended) | General use, TypeScript, ecosystem compatibility | Stable, widely used, works with most ORMs |
+| **postgres.js** | Advanced features, template literals, streaming | Lighter than pg, `prepare: true` is default |
+| **mysql2** | MySQL/MariaDB/PlanetScale | MySQL only, less mature support |
+
+## Reading Order
+
+| New to Hyperdrive | Implementing | Troubleshooting |
+|-------------------|--------------|-----------------|
+| 1. README (this) | 1. [configuration.md](./configuration.md) | 1. [gotchas.md](./gotchas.md) |
+| 2. [configuration.md](./configuration.md) | 2. [api.md](./api.md) | 2. [patterns.md](./patterns.md) |
+| 3. [api.md](./api.md) | 3. [patterns.md](./patterns.md) | 3. [api.md](./api.md) |
+
+## In This Reference
+- [configuration.md](./configuration.md) - Setup, wrangler config, Smart Placement
+- [api.md](./api.md) - Binding APIs, query patterns, driver usage
+- [patterns.md](./patterns.md) - Use cases, ORMs, multi-query optimization
+- [gotchas.md](./gotchas.md) - Limits, troubleshooting, connection management
+
+## See Also
+- [smart-placement](../smart-placement/) - Optimize multi-query Workers near databases
+- [d1](../d1/) - Serverless SQLite alternative for edge-native apps
+- [workers](../workers/) - Worker runtime with database bindings
--- a/.agents/skills/cloudflare-deploy/references/hyperdrive/api.md
+++ b/.agents/skills/cloudflare-deploy/references/hyperdrive/api.md
@@ -0,0 +1,143 @@
+# API Reference
+
+See [README.md](./README.md) for overview, [configuration.md](./configuration.md) for setup.
+
+## Binding Interface
+
+```typescript
+interface Hyperdrive {
+  connectionString: string;  // PostgreSQL
+  // MySQL properties:
+  host: string;
+  port: number;
+  user: string;
+  password: string;
+  database: string;
+}
+
+interface Env {
+  HYPERDRIVE: Hyperdrive;
+}
+```
+
+**Generate types:** `npx wrangler types` (auto-creates worker-configuration.d.ts from wrangler.jsonc)
+
+## PostgreSQL (node-postgres) - RECOMMENDED
+
+```typescript
+import { Client } from "pg";  // pg@^8.17.2
+
+export default {
+  async fetch(req: Request, env: Env): Promise<Response> {
+    const client = new Client({connectionString: env.HYPERDRIVE.connectionString});
+    try {
+      await client.connect();
+      const result = await client.query("SELECT * FROM users WHERE id = $1", [123]);
+      return Response.json(result.rows);
+    } finally {
+      await client.end();
+    }
+  },
+};
+```
+
+**⚠️ Workers connection limit: 6 per Worker invocation** - use connection pooling wisely.
+
+## PostgreSQL (postgres.js)
+
+```typescript
+import postgres from "postgres";  // postgres@^3.4.8
+
+const sql = postgres(env.HYPERDRIVE.connectionString, {
+  max: 5,             // Limit per Worker (Workers max: 6)
+  prepare: true,      // Enabled by default, required for caching
+  fetch_types: false, // Reduce latency if not using arrays
+});
+
+const users = await sql`SELECT * FROM users WHERE active = ${true} LIMIT 10`;
+```
+
+**⚠️ `prepare: true` is enabled by default and required for Hyperdrive caching.** Setting to `false` disables prepared statements + cache.
+
+## MySQL (mysql2)
+
+```typescript
+import { createConnection } from "mysql2/promise";  // mysql2@^3.16.2
+
+const conn = await createConnection({
+  host: env.HYPERDRIVE.host,
+  user: env.HYPERDRIVE.user,
+  password: env.HYPERDRIVE.password,
+  database: env.HYPERDRIVE.database,
+  port: env.HYPERDRIVE.port,
+  disableEval: true,  // ⚠️ REQUIRED for Workers
+});
+
+const [results] = await conn.query("SELECT * FROM users WHERE active = ? LIMIT ?", [true, 10]);
+ctx.waitUntil(conn.end());
+```
+
+**⚠️ MySQL support is less mature than PostgreSQL** - expect fewer optimizations and potential edge cases.
+
+## Query Caching
+
+**Cacheable:**
+```sql
+SELECT * FROM posts WHERE published = true;
+SELECT COUNT(*) FROM users;
+```
+
+**NOT cacheable:**
+```sql
+-- Writes
+INSERT/UPDATE/DELETE
+
+-- Volatile functions
+SELECT NOW();
+SELECT random();
+SELECT LASTVAL();  -- PostgreSQL
+SELECT UUID();     -- MySQL
+```
+
+**Cache config:**
+- Default: `max_age=60s`, `swr=15s`
+- Max `max_age`: 3600s
+- Disable: `--caching-disabled=true`
+
+**Multiple configs pattern:**
+```typescript
+// Reads: cached
+const sqlCached = postgres(env.HYPERDRIVE_CACHED.connectionString);
+const posts = await sqlCached`SELECT * FROM posts ORDER BY views DESC LIMIT 10`;
+
+// Writes/time-sensitive: no cache
+const sqlNoCache = postgres(env.HYPERDRIVE_NO_CACHE.connectionString);
+const orders = await sqlNoCache`SELECT * FROM orders WHERE created_at > NOW() - INTERVAL 5 MINUTE`;
+```
+
+## ORMs
+
+**Drizzle:**
+```typescript
+import { drizzle } from "drizzle-orm/postgres-js";  // drizzle-orm@^0.45.1
+import postgres from "postgres";
+
+const client = postgres(env.HYPERDRIVE.connectionString, {max: 5, prepare: true});
+const db = drizzle(client);
+const users = await db.select().from(users).where(eq(users.active, true)).limit(10);
+```
+
+**Kysely:**
+```typescript
+import { Kysely, PostgresDialect } from "kysely";  // kysely@^0.27+
+import postgres from "postgres";
+
+const db = new Kysely({
+  dialect: new PostgresDialect({
+    postgres: postgres(env.HYPERDRIVE.connectionString, {max: 5, prepare: true}),
+  }),
+});
+const users = await db.selectFrom("users").selectAll().where("active", "=", true).execute();
+```
+
+See [patterns.md](./patterns.md) for use cases, [gotchas.md](./gotchas.md) for limits.
--- a/.agents/skills/cloudflare-deploy/references/hyperdrive/configuration.md
+++ b/.agents/skills/cloudflare-deploy/references/hyperdrive/configuration.md
@@ -0,0 +1,159 @@
+# Configuration
+
+See [README.md](./README.md) for overview.
+
+## Create Config
+
+**PostgreSQL:**
+```bash
+# Basic
+npx wrangler hyperdrive create my-db \
+  --connection-string="postgres://user:pass@host:5432/db"
+
+# Custom cache
+npx wrangler hyperdrive create my-db \
+  --connection-string="postgres://..." \
+  --max-age=120 --swr=30
+
+# No cache
+npx wrangler hyperdrive create my-db \
+  --connection-string="postgres://..." \
+  --caching-disabled=true
+```
+
+**MySQL:**
+```bash
+npx wrangler hyperdrive create my-db \
+  --connection-string="mysql://user:pass@host:3306/db"
+```
+
+## wrangler.jsonc
+
+```jsonc
+{
+  "compatibility_date": "2025-01-01", // Use latest for new projects
+  "compatibility_flags": ["nodejs_compat"],
+  "hyperdrive": [
+    {
+      "binding": "HYPERDRIVE",
+      "id": "<HYPERDRIVE_ID>",
+      "localConnectionString": "postgres://user:pass@localhost:5432/dev"
+    }
+  ]
+}
+```
+
+**Generate TypeScript types:** Run `npx wrangler types` to auto-generate `worker-configuration.d.ts` from your wrangler.jsonc.
+
+**Multiple configs:**
+```jsonc
+{
+  "hyperdrive": [
+    {"binding": "HYPERDRIVE_CACHED", "id": "<ID1>"},
+    {"binding": "HYPERDRIVE_NO_CACHE", "id": "<ID2>"}
+  ]
+}
+```
+
+## Management
+
+```bash
+npx wrangler hyperdrive list
+npx wrangler hyperdrive get <ID>
+npx wrangler hyperdrive update <ID> --max-age=180
+npx wrangler hyperdrive delete <ID>
+```
+
+## Config Options
+
+Hyperdrive create/update CLI flags:
+
+| Option | Default | Notes |
+|--------|---------|-------|
+| `--caching-disabled` | `false` | Disable caching |
+| `--max-age` | `60` | Cache TTL (max 3600s) |
+| `--swr` | `15` | Stale-while-revalidate |
+| `--origin-connection-limit` | 20/100 | Free/paid |
+| `--access-client-id` | - | Tunnel auth |
+| `--access-client-secret` | - | Tunnel auth |
+| `--sslmode` | `require` | PostgreSQL only |
+
+## Smart Placement Integration
+
+For Workers making **multiple queries** per request, enable Smart Placement to execute near your database:
+
+```jsonc
+{
+  "compatibility_date": "2025-01-01",
+  "compatibility_flags": ["nodejs_compat"],
+  "placement": {
+    "mode": "smart"
+  },
+  "hyperdrive": [
+    {
+      "binding": "HYPERDRIVE",
+      "id": "<HYPERDRIVE_ID>"
+    }
+  ]
+}
+```
+
+**Benefits:** Multi-query Workers run closer to DB, reducing round-trip latency. See [patterns.md](./patterns.md) for examples.
+
+## Private DB via Tunnel
+
+```
+Worker → Hyperdrive → Access → Tunnel → Private Network → DB
+```
+
+**Setup:**
+```bash
+# 1. Create tunnel
+cloudflared tunnel create my-db-tunnel
+
+# 2. Configure hostname in Zero Trust dashboard
+#    Domain: db-tunnel.example.com
+#    Service: TCP -> localhost:5432
+
+# 3. Create service token (Zero Trust > Service Auth)
+#    Save Client ID/Secret
+
+# 4. Create Access app (db-tunnel.example.com)
+#    Policy: Service Auth token from step 3
+
+# 5. Create Hyperdrive
+npx wrangler hyperdrive create my-private-db \
+  --host=db-tunnel.example.com \
+  --user=dbuser --password=dbpass --database=prod \
+  --access-client-id=<ID> --access-client-secret=<SECRET>
+```
+
+**⚠️ Don't specify `--port` with Tunnel** - port configured in tunnel service settings.
+
+## Local Dev
+
+**Option 1: Local (RECOMMENDED):**
+```bash
+# Env var (takes precedence)
+export CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_HYPERDRIVE="postgres://user:pass@localhost:5432/dev"
+npx wrangler dev
+
+# wrangler.jsonc
+{"hyperdrive": [{"binding": "HYPERDRIVE", "localConnectionString": "postgres://..."}]}
+```
+
+**Remote DB locally:**
+```bash
+# PostgreSQL
+export CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_HYPERDRIVE="postgres://user:pass@remote:5432/db?sslmode=require"
+
+# MySQL
+export CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_HYPERDRIVE="mysql://user:pass@remote:3306/db?sslMode=REQUIRED"
+```
+
+**Option 2: Remote execution:**
+```bash
+npx wrangler dev --remote  # Uses deployed config, affects production
+```
+
+See [api.md](./api.md), [patterns.md](./patterns.md), [gotchas.md](./gotchas.md).
--- a/.agents/skills/cloudflare-deploy/references/hyperdrive/gotchas.md
+++ b/.agents/skills/cloudflare-deploy/references/hyperdrive/gotchas.md
@@ -0,0 +1,77 @@
+# Gotchas
+
+See [README.md](./README.md), [configuration.md](./configuration.md), [api.md](./api.md), [patterns.md](./patterns.md).
+
+## Common Errors
+
+### "Too many open connections" / "Connection limit exceeded"
+
+**Cause:** Workers have a hard limit of **6 concurrent connections per invocation**  
+**Solution:** Set `max: 5` in driver config, reuse connections, ensure proper cleanup with `client.end()` or `ctx.waitUntil(conn.end())`
+
+### "Failed to acquire a connection (Pool exhausted)"
+
+**Cause:** All connections in pool are in use, often due to long-running transactions  
+**Solution:** Reduce transaction duration, avoid queries >60s, don't hold connections during external calls, or upgrade to paid plan for more connections
+
+### "connection_refused"
+
+**Cause:** Database refusing connections due to firewall, connection limits, or service down  
+**Solution:** Check firewall allows Cloudflare IPs, verify DB listening on port, confirm service running, and validate credentials
+
+### "Query timeout (deadline exceeded)"
+
+**Cause:** Query execution exceeding 60s timeout limit  
+**Solution:** Optimize with indexes, reduce dataset with LIMIT, break into smaller queries, or use async processing
+
+### "password authentication failed"
+
+**Cause:** Invalid credentials in Hyperdrive configuration  
+**Solution:** Check username and password in Hyperdrive config match database credentials
+
+### "SSL/TLS connection error"
+
+**Cause:** SSL/TLS configuration mismatch between Hyperdrive and database  
+**Solution:** Add `sslmode=require` (Postgres) or `sslMode=REQUIRED` (MySQL), upload CA cert if self-signed, verify DB has SSL enabled, and check cert expiry
+
+### "Queries not being cached"
+
+**Cause:** Query is mutating (INSERT/UPDATE/DELETE), contains volatile functions (NOW(), RANDOM()), or caching disabled  
+**Solution:** Verify query is non-mutating SELECT, avoid volatile functions, confirm caching enabled, use `wrangler dev --remote` to test, and set `prepare=true` for postgres.js
+
+### "Slow multi-query Workers despite Hyperdrive"
+
+**Cause:** Worker executing at edge, each query round-trips to DB region  
+**Solution:** Enable Smart Placement (`"placement": {"mode": "smart"}` in wrangler.jsonc) to execute Worker near DB. See [patterns.md](./patterns.md) Multi-Query pattern.
+
+### "Local database connection failed"
+
+**Cause:** `localConnectionString` incorrect or database not running  
+**Solution:** Verify `localConnectionString` correct, check DB running, confirm env var name matches binding, and test with psql/mysql client
+
+### "Environment variable not working"
+
+**Cause:** Environment variable format incorrect or not exported  
+**Solution:** Use format `CLOUDFLARE_HYPERDRIVE_LOCAL_CONNECTION_STRING_<BINDING>`, ensure binding matches wrangler.jsonc, export variable in shell, and restart wrangler dev
+
+## Limits
+
+| Limit | Free | Paid | Notes |
+|-------|------|------|-------|
+| Max configs | 10 | 25 | Hyperdrive configurations per account |
+| Worker connections | 6 | 6 | Max concurrent connections per Worker invocation |
+| Username/DB name | 63 bytes | 63 bytes | Maximum length |
+| Connection timeout | 15s | 15s | Time to establish connection |
+| Idle timeout | 10 min | 10 min | Connection idle timeout |
+| Max origin connections | ~20 | ~100 | Connections to origin database |
+| Query duration max | 60s | 60s | Queries >60s terminated |
+| Cached response max | 50 MB | 50 MB | Responses >50MB returned but not cached |
+
+## Resources
+
+- [Docs](https://developers.cloudflare.com/hyperdrive/)
+- [Getting Started](https://developers.cloudflare.com/hyperdrive/get-started/)
+- [Wrangler Reference](https://developers.cloudflare.com/hyperdrive/reference/wrangler-commands/)
+- [Supported DBs](https://developers.cloudflare.com/hyperdrive/reference/supported-databases-and-features/)
+- [Discord #hyperdrive](https://discord.cloudflare.com)
+- [Limit Increase Form](https://forms.gle/ukpeZVLWLnKeixDu7)
--- a/.agents/skills/cloudflare-deploy/references/hyperdrive/patterns.md
+++ b/.agents/skills/cloudflare-deploy/references/hyperdrive/patterns.md
@@ -0,0 +1,190 @@
+# Patterns
+
+See [README.md](./README.md), [configuration.md](./configuration.md), [api.md](./api.md).
+
+## High-Traffic Read-Heavy
+
+```typescript
+const sql = postgres(env.HYPERDRIVE.connectionString, {max: 5, prepare: true});
+
+// Cacheable: popular content
+const posts = await sql`SELECT * FROM posts WHERE published = true ORDER BY views DESC LIMIT 20`;
+
+// Cacheable: user profiles
+const [user] = await sql`SELECT id, username, bio FROM users WHERE id = ${userId}`;
+```
+
+**Benefits:** Trending/profiles cached (60s), connection pooling handles spikes.
+
+## Mixed Read/Write
+
+```typescript
+interface Env {
+  HYPERDRIVE_CACHED: Hyperdrive;    // max_age=120
+  HYPERDRIVE_REALTIME: Hyperdrive;  // caching disabled
+}
+
+// Reads: cached
+if (req.method === "GET") {
+  const sql = postgres(env.HYPERDRIVE_CACHED.connectionString, {prepare: true});
+  const products = await sql`SELECT * FROM products WHERE category = ${cat}`;
+}
+
+// Writes: no cache (immediate consistency)
+if (req.method === "POST") {
+  const sql = postgres(env.HYPERDRIVE_REALTIME.connectionString, {prepare: true});
+  await sql`INSERT INTO orders ${sql(data)}`;
+}
+```
+
+## Analytics Dashboard
+
+```typescript
+const client = new Client({connectionString: env.HYPERDRIVE.connectionString});
+await client.connect();
+
+// Aggregate queries cached (use fixed timestamps for caching)
+const thirtyDaysAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000).toISOString();
+const dailyStats = await client.query(`
+  SELECT DATE(created_at) as date, COUNT(*) as orders, SUM(amount) as revenue
+  FROM orders WHERE created_at >= $1
+  GROUP BY DATE(created_at) ORDER BY date DESC
+`, [thirtyDaysAgo]);
+
+const sevenDaysAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString();
+const topProducts = await client.query(`
+  SELECT p.name, COUNT(oi.id) as count, SUM(oi.quantity * oi.price) as revenue
+  FROM order_items oi JOIN products p ON oi.product_id = p.id
+  WHERE oi.created_at >= $1
+  GROUP BY p.id, p.name ORDER BY revenue DESC LIMIT 10
+`, [sevenDaysAgo]);
+```
+
+**Benefits:** Expensive aggregations cached (avoid NOW() for cacheability), dashboard instant, reduced DB load.
+
+## Multi-Tenant
+
+```typescript
+const tenantId = req.headers.get("X-Tenant-ID");
+const sql = postgres(env.HYPERDRIVE.connectionString, {prepare: true});
+
+// Tenant-scoped queries cached separately
+const docs = await sql`
+  SELECT * FROM documents 
+  WHERE tenant_id = ${tenantId} AND deleted_at IS NULL
+  ORDER BY updated_at DESC LIMIT 50
+`;
+```
+
+**Benefits:** Per-tenant caching, shared connection pool, protects DB from multi-tenant load.
+
+## Geographically Distributed
+
+```typescript
+// Worker runs at edge nearest user
+// Connection setup at edge (fast), pooling near DB (efficient)
+const sql = postgres(env.HYPERDRIVE.connectionString, {prepare: true});
+const [user] = await sql`SELECT * FROM users WHERE id = ${userId}`;
+
+return Response.json({
+  user,
+  serverRegion: req.cf?.colo,  // Edge location
+});
+```
+
+**Benefits:** Edge setup + DB pooling = global → single-region DB without replication.
+
+## Multi-Query + Smart Placement
+
+For Workers making **multiple queries** per request, enable Smart Placement to execute near DB:
+
+```jsonc
+// wrangler.jsonc
+{
+  "placement": {"mode": "smart"},
+  "hyperdrive": [{"binding": "HYPERDRIVE", "id": "<ID>"}]
+}
+```
+
+```typescript
+const sql = postgres(env.HYPERDRIVE.connectionString, {prepare: true});
+
+// Multiple queries benefit from Smart Placement
+const [user] = await sql`SELECT * FROM users WHERE id = ${userId}`;
+const orders = await sql`SELECT * FROM orders WHERE user_id = ${userId} ORDER BY created_at DESC LIMIT 10`;
+const stats = await sql`SELECT COUNT(*) as total, SUM(amount) as spent FROM orders WHERE user_id = ${userId}`;
+
+return Response.json({user, orders, stats});
+```
+
+**Benefits:** Worker executes near DB → reduces latency for each query. Without Smart Placement, each query round-trips from edge.
+
+## Connection Pooling
+
+Operates in **transaction mode**: connection acquired per transaction, `RESET` on return.
+
+**SET statements:**
+```typescript
+// ✅ Within transaction
+await client.query("BEGIN");
+await client.query("SET work_mem = '256MB'");
+await client.query("SELECT * FROM large_table");  // Uses SET
+await client.query("COMMIT");  // RESET after
+
+// ✅ Single statement
+await client.query("SET work_mem = '256MB'; SELECT * FROM large_table");
+
+// ❌ Across queries (may get different connection)
+await client.query("SET work_mem = '256MB'");
+await client.query("SELECT * FROM large_table");  // SET not applied
+```
+
+**Best practices:**
+```typescript
+// ❌ Long transactions block pooling
+await client.query("BEGIN");
+await processThousands();  // Connection held entire time
+await client.query("COMMIT");
+
+// ✅ Short transactions
+await client.query("BEGIN");
+await client.query("UPDATE users SET status = $1 WHERE id = $2", [status, id]);
+await client.query("COMMIT");
+
+// ✅ SET LOCAL within transaction
+await client.query("BEGIN");
+await client.query("SET LOCAL work_mem = '256MB'");
+await client.query("SELECT * FROM large_table");
+await client.query("COMMIT");
+```
+
+## Performance Tips
+
+**Enable prepared statements (required for caching):**
+```typescript
+const sql = postgres(connectionString, {prepare: true});  // Default, enables caching
+```
+
+**Optimize connection settings:**
+```typescript
+const sql = postgres(connectionString, {
+  max: 5,             // Stay under Workers' 6 connection limit
+  fetch_types: false, // Reduce latency if not using arrays
+  idle_timeout: 60,   // Match Worker lifetime
+});
+```
+
+**Write cache-friendly queries:**
+```typescript
+// ✅ Cacheable (deterministic)
+await sql`SELECT * FROM products WHERE category = 'electronics' LIMIT 10`;
+
+// ❌ Not cacheable (volatile NOW())
+await sql`SELECT * FROM logs WHERE created_at > NOW()`;
+
+// ✅ Cacheable (parameterized timestamp)
+const ts = Date.now();
+await sql`SELECT * FROM logs WHERE created_at > ${ts}`;
+```
+
+See [gotchas.md](./gotchas.md) for limits, troubleshooting.