dx: realistic seed data script for local development

[BernardOnuh]

dx: realistic seed data script for local development

Closes #223

Summary

Extends prisma/seed.ts with a realistic dataset for local development and demo purposes. Working with an empty database makes it impossible to effectively develop and test UI features like charts, tables, and dashboards.

What's seeded

Entity	Count	Details
Subscription Tiers	3	Free, Pro, Enterprise (unchanged from original)
Demo Tenants	3	Acme DeFi (Pro), Nova Payments (Enterprise), Pebble Wallet (Free)
API Keys	6	2 per demo tenant — Production Key + Sandbox Key
Transactions	1,000	Spread across 30 days, mixed status/chain/category
Webhook Deliveries	~2,500	1–4 delivery attempts per transaction
Spend Baselines	3	30-day rolling averages per demo tenant

Acceptance criteria

• Creates 3 Tenants, each with 2 API keys
• Creates 1,000 realistic Transaction records spread across 30 days
• Creates sample Webhook URLs and delivery logs
• Runnable via npm run db:seed (already wired in package.json)

Implementation notes

• Fully backward compatible — the original two test tenants (tenant-test-001, tenant-test-002) and their API keys are preserved unchanged
• Idempotent — safe to re-run; demo transactions and webhook deliveries are deleted and recreated per tenant, everything else uses upsert
• Reproducible — uses a seeded PRNG so data distribution is consistent across runs
• Batched inserts — transactions and webhook deliveries are inserted in batches of 100 to respect SQLite statement limits
• Follows the existing adapter/logger pattern (PrismaBetterSqlite3, createLogger)

How to test

cd server
npm run db:seed

Expected log output:

Upserted subscription tiers  { tier_count: 3 }
Upserted demo tenants        { tenant_count: 3 }
Created demo API keys        { api_key_count: 6 }
Created 1,000 demo transactions (spread over 30 days)  { tx_count: 1000 }
Created webhook delivery logs  { delivery_count: ~2500 }
Upserted spend baselines     { tenant_count: 3 }
✅ Seeding complete

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🎉 This PR is included in version 1.21.0 🎉

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