pdf files db, backend route done

packages/db/prisma/schema.prisma

@@ -52,7 +52,10 @@ model Patient {
   user              User          @relation(fields: [userId], references: [id])
   appointments      Appointment[]
   claims            Claim[]
-  pdfs              ClaimPdf[]
+  groups            PdfGroup[]
+
+  @@index([insuranceId])
+  @@index([createdAt])
 }
 
 model Appointment {
@@ -73,6 +76,9 @@ model Appointment {
   user    User    @relation(fields: [userId], references: [id])
   staff   Staff?  @relation(fields: [staffId], references: [id])
   claims  Claim[]
+
+  @@index([patientId])
+  @@index([date])
 }
 
 model Staff {
@@ -108,7 +114,6 @@ model Claim {
   staff       Staff?      @relation("ClaimStaff", fields: [staffId], references: [id])
 
   serviceLines ServiceLine[]
-  pdf          ClaimPdf[]
 }
 
 model ServiceLine {
@@ -136,17 +141,33 @@ model InsuranceCredential {
   @@index([userId])
 }
 
-model ClaimPdf {
+model PdfGroup {
+  id        Int         @id @default(autoincrement())
+  title     String // e.g., "June Claim Docs", "Eligibility Set A"
+  category  PdfCategory
+  createdAt DateTime    @default(now())
+  patientId Int
+  patient   Patient     @relation(fields: [patientId], references: [id], onDelete: Cascade)
+  pdfs      PdfFile[]
+
+  @@index([patientId])
+  @@index([category])
+}
+
+model PdfFile {
   id         Int      @id @default(autoincrement())
-  patientId  Int
-  claimId    Int?
   filename   String
   pdfData    Bytes
   uploadedAt DateTime @default(now())
+  groupId    Int
+  group      PdfGroup @relation(fields: [groupId], references: [id], onDelete: Cascade)
 
-  patient Patient @relation(fields: [patientId], references: [id], onDelete: Cascade)
-  claim   Claim?  @relation(fields: [claimId], references: [id], onDelete: Cascade)
+  @@index([groupId])
 
-  @@index([patientId])
-  @@index([claimId])
+}
+
+enum PdfCategory {
+  CLAIM
+  ELIGIBILITY
+  OTHER
 }