• ✅ .env removed from Git tracking
• ✅ .env added to .gitignore
• ✅ .env.example provides template with instructions
• ✅ README.md includes security warnings

MANDATORY SECURITY CHECKS:

1. Verify .env is NOT tracked:

   git ls-files | grep -E '\.env$'
   # Should return NO results (only .env.example should exist)

2. Confirm .gitignore includes .env:

   grep -E '\.env' .gitignore
   # Should show .env patterns

3. Check for accidental commits:

   git log --all --full-history -- .env
   # If this shows results, see "🚨 If .env Was Already Committed" below

If your .env file with real credentials was ever committed to a repository:

1. Immediately rotate your Supabase keys:

   • Go to Supabase Dashboard > Settings > API
   • Reset your anon key
   • Update your local .env with new keys

2. Remove from Git history (if repository is private):

   git filter-branch --force --index-filter \
     'git rm --cached --ignore-unmatch .env' \
     --prune-empty --tag-name-filter cat -- --all

3. For public repositories:

   • Create a new Supabase project
   • Update all your environment variables
   • Consider the old keys compromised

• ✅ All Supabase tables have RLS enabled
• ✅ Users can only access their own data
• ✅ Anonymous users cannot access authenticated data

// In src/lib/supabase.ts
if (!SUPABASE_URL || !SUPABASE_ANON_KEY) {
  console.warn('Supabase env vars not found. Supabase sync will be disabled.');
}

1. Set environment variables in dashboard (not in code)
2. Use different Supabase project for production
3. Never use development keys in production

1. Use Docker secrets or environment files
2. Never include .env in Docker images
3. Use build-time arguments for public variables only

• .env is in .gitignore
• .env is not tracked by Git
• No credentials hardcoded in source files
• .env.example has dummy values only
• Production uses separate Supabase project
• RLS policies are properly configured
• Environment variables set in deployment platform

# Final check before pushing
git status
git ls-files | grep -E '\.env$'  # Should be empty

# Safe to push
git add .
git commit -m "feat: add authentication and database integration"
git push origin main

If credentials are accidentally exposed:

1. Immediately rotate Supabase keys
2. Check repository access logs
3. Monitor Supabase usage for unusual activity
4. Consider creating new Supabase project if exposure was public

Remember: It's always better to be overly cautious with credentials than to deal with a security incident later!