Type-safe D1 databases with Drizzle ORM, migrations, and batch API patterns for Cloudflare Workers.

• Includes schema definition, Drizzle Kit migrations, relations, and D1-specific batch API for transactions (D1 doesn't support SQL BEGIN)
• Prevents 18 documented errors including transaction failures, cascade data loss, 100-parameter limits, foreign key issues, and nested migration discovery
• Supports dynamic query building, upserts, logging, and Drizzle Studio for visual database browsing
• Critical D1 rules: use db.batch() for transactions, test migrations locally first, use integer with mode: 'timestamp' for dates, chunk bulk inserts under 100 parameters