canvas-website/backlog/tasks/task-015 - Set-up-Cloudflare-D1-email-collector-database-for-cross-site-subscriptions.md

id	title	status	assignee	created_date	updated_date	labels	dependencies	priority
task-015	Set up Cloudflare D1 email-collector database for cross-site subscriptions	To Do		2025-12-04 12:00	2025-12-04 12:03	infrastructure cloudflare d1 email cross-site		medium

Description

Create a standalone Cloudflare D1 database for collecting email subscriptions across all websites (mycofi.earth, canvas.jeffemmett.com, decolonizeti.me, etc.) with easy export capabilities.

Purpose:

• Unified email collection from all sites
• Page-separated lists (e.g., /newsletter, /waitlist, /landing)
• Simple CSV/JSON export for email campaigns
• GDPR-compliant with unsubscribe tracking

Sites to integrate:

• mycofi.earth
• canvas.jeffemmett.com
• decolonizeti.me
• games.jeffemmett.com
• Future sites

Key Features:

• Double opt-in verification
• Source tracking (which site, which page)
• Export in multiple formats (CSV, JSON, Mailchimp)
• Basic admin dashboard or CLI for exports
• Rate limiting to prevent abuse

Acceptance Criteria

• #1 D1 database 'email-collector' created on Cloudflare
• #2 Schema deployed with subscribers, verification_tokens tables
• #3 POST /api/subscribe endpoint accepts email + source_site + source_page
• #4 Email verification flow with token-based double opt-in
• #5 GET /api/emails/export returns CSV with filters (site, date, verified)
• #6 Unsubscribe endpoint and tracking
• #7 Rate limiting prevents spam submissions
• #8 At least one site integrated and collecting emails

Implementation Plan

Implementation Steps

1. Create D1 Database

wrangler d1 create email-collector

2. Create Schema File

Create worker/email-collector-schema.sql:

-- Email Collector Schema
-- Cross-site email subscription management

CREATE TABLE IF NOT EXISTS subscribers (
  id TEXT PRIMARY KEY,
  email TEXT NOT NULL,
  email_hash TEXT NOT NULL,  -- For duplicate checking
  source_site TEXT NOT NULL,
  source_page TEXT,
  referrer TEXT,
  ip_country TEXT,
  subscribed_at TEXT DEFAULT (datetime('now')),
  verified INTEGER DEFAULT 0,
  verified_at TEXT,
  unsubscribed INTEGER DEFAULT 0,
  unsubscribed_at TEXT,
  metadata TEXT  -- JSON for custom fields
);

CREATE TABLE IF NOT EXISTS verification_tokens (
  id TEXT PRIMARY KEY,
  email TEXT NOT NULL,
  token TEXT UNIQUE NOT NULL,
  expires_at TEXT NOT NULL,
  used INTEGER DEFAULT 0,
  created_at TEXT DEFAULT (datetime('now'))
);

-- Rate limiting table
CREATE TABLE IF NOT EXISTS rate_limits (
  ip_hash TEXT PRIMARY KEY,
  request_count INTEGER DEFAULT 1,
  window_start TEXT DEFAULT (datetime('now'))
);

-- Indexes
CREATE INDEX IF NOT EXISTS idx_subs_email_hash ON subscribers(email_hash);
CREATE INDEX IF NOT EXISTS idx_subs_site ON subscribers(source_site);
CREATE INDEX IF NOT EXISTS idx_subs_page ON subscribers(source_site, source_page);
CREATE INDEX IF NOT EXISTS idx_subs_verified ON subscribers(verified);
CREATE UNIQUE INDEX IF NOT EXISTS idx_subs_unique ON subscribers(email_hash, source_site);
CREATE INDEX IF NOT EXISTS idx_tokens_token ON verification_tokens(token);

3. Create Worker Endpoints

Create worker/emailCollector.ts:

// POST /api/subscribe
// GET /api/verify/:token
// POST /api/unsubscribe
// GET /api/emails/export (auth required)
// GET /api/emails/stats

4. Export Formats

• CSV: email,source_site,source_page,subscribed_at,verified
• JSON: Full object array
• Mailchimp: CSV with required headers

5. Admin Authentication

• Use simple API key for export endpoint
• Store in Worker secret: EMAIL_ADMIN_KEY

6. Integration

Add to each site's signup form:

fetch('https://canvas.jeffemmett.com/api/subscribe', {
  method: 'POST',
  body: JSON.stringify({
    email: 'user@example.com',
    source_site: 'mycofi.earth',
    source_page: '/newsletter'
  })
})