feat: support both SQLite and PostgreSQL in prisma.ts

src/lib/prisma.ts

@@ -1,6 +1,4 @@
 import { PrismaClient } from '@prisma/client'
-import { PrismaPg } from '@prisma/adapter-pg'
-import pg from 'pg'
 import dotenv from 'dotenv'
 
 // Load .env file if it exists
@@ -10,11 +8,24 @@ const globalForPrisma = globalThis as unknown as {
   prisma: PrismaClient | undefined
 }
 
-const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL })
+// Detect database provider from environment (default to sqlite for local development)
+const databaseProvider = process.env.DATABASE_PROVIDER || 'sqlite'
 
-// Create PrismaClient with adapter
+// Create PrismaClient with appropriate adapter
 const createPrismaClient = () => {
-  const client = new PrismaClient({ adapter })
+  let client: PrismaClient
+  
+  if (databaseProvider === 'postgresql') {
+    // Use PrismaPg adapter for PostgreSQL
+    const { PrismaPg } = require('@prisma/adapter-pg')
+    const pg = require('pg')
+    const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL })
+    client = new PrismaClient({ adapter })
+  } else {
+    // No adapter needed for SQLite
+    client = new PrismaClient()
+  }
+  
   return client
 }