diff --git a/.env.example b/.env.example
index d0a36bd..4babd36 100644
--- a/.env.example
+++ b/.env.example
@@ -1,4 +1,5 @@
-DATABASE_URL="file:./dev.db"
+# Prisma datasource: production uses PostgreSQL in this project.
+DATABASE_URL="postgresql://whatsapp_inbox:YOUR_DB_PASSWORD@127.0.0.1:5432/whatsapp_inbox?schema=public"
 AUTH_SECRET="change-me"
 WHATSAPP_API_TOKEN="your-meta-token"
 WHATSAPP_API_VERSION="v22.0"
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 9ea398a..0b8a173 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -3,7 +3,7 @@ generator client {
 }
 
 datasource db {
-  provider = "sqlite"
+  provider = "postgresql"
   url      = env("DATABASE_URL")
 }