working full end-to-end with encryption

prisma/schema.prisma

@@ -6,15 +6,30 @@ datasource db {
   provider = "postgresql"
 }
 
-model User {
+model Session {
   id        String   @id @default(uuid())
-  username  String   @unique
-  password  String
+  token     String   @unique
+  userId    String
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  
+  expiresAt DateTime
   createdAt DateTime @default(now())
   
+  @@index([userId])
+  @@index([token])
+}
+
+model User {
+  id              String   @id @default(uuid())
+  username        String   @unique
+  password        String   // Bcrypt hash for login auth
+  skywardPassword String   // Encrypted password for Skyward API calls
+  createdAt       DateTime @default(now())
+  
   classes     Class[]
   fetches     Fetch[]
   finalGrades FinalGrade[]
+  sessions    Session[]
 }
 
 model Class {