feat: migrate Prisma datasource from SQLite to Supabase PostgreSQL (Phase 1)

[brucelikeeat]

Phase 1 — Database Migration: SQLite → Supabase PostgreSQL

What this PR does

Migrates the Prisma datasource from SQLite to Supabase PostgreSQL and creates the project launch log.

Changes

File	Change
prisma/schema.prisma	Provider changed sqlite → postgresql; directUrl = env("DIRECT_URL") added; Account.refresh_token, access_token, id_token annotated @db.Text
.env.example	Updated to show PostgreSQL pooler URL format + added DIRECT_URL entry
docs/launch-log.md	Created — Phase 1 launch log with step status and full agent log

Schema audit results

• Account.refresh_token → @db.Text — OAuth refresh tokens exceed varchar(191)
• Account.access_token → @db.Text — GitHub OAuth tokens can exceed 191 chars
• Account.id_token → @db.Text — OIDC JWTs are long
• All DateTime fields use proper DateTime type (no string defaults) ✅
• No Boolean-as-Int patterns found ✅
• All 4 NextAuth adapter tables present with correct fields ✅

Steps status

Step	Status
1.1 Read current state	✅
1.2 Update datasource block	✅
1.3 Audit + @db.Text fields	✅
1.4 Verify .env URLs	⚠️ blocked — .env was absent, created with placeholders
1.5 Run migration	⚠️ blocked — needs real Supabase URLs in .env
1.6 prisma generate + next build	✅

Action required before merging

The .env file was not present in this environment. It has been created locally (gitignored) with placeholder values. You must fill in your real Supabase connection strings:

DATABASE_URL="postgresql://postgres.[ref]:[password]@aws-0-[region].pooler.supabase.com:6543/postgres?pgbouncer=true"
DIRECT_URL="postgresql://postgres.[ref]:[password]@aws-0-[region].pooler.supabase.com:5432/postgres"

Then run:

npx prisma migrate dev --name switch-to-postgres

Build verification

• npx prisma generate — ✅ Prisma Client v5.22.0 generated from updated schema
• npx next build — ✅ all 16 routes compiled, zero Prisma-related errors

Non-Prisma issues found (not fixed per instructions):

• Leftover [ENV CHECK] debug log fires at build time
• /api/debug-session route still exists (worklog says it was removed but it remains)