Enhance dashboard functionality by integrating child selection and displaying related measurements, vaccinations, and toothing data. Update Prisma schema to use UUIDs for IDs and add new API endpoint to fetch child details by ID.

prisma/schema.prisma

@@ -22,7 +22,7 @@ model User {
 }
 
 model Child {
-  id          Int       @id @default(autoincrement())
+  id          String    @id @default(uuid())
   name        String
   birthDate   DateTime
   gender      String?   // can be "male", "female", "diverse", or "unknown"
@@ -35,26 +35,27 @@ model Child {
 }
 
 model Measurement {
-  id        Int      @id @default(autoincrement())
-  childId   Int
+  id        String   @id @default(uuid())
+  childId   String
   child     Child    @relation(fields: [childId], references: [id])
   date      DateTime
   weightKg  Float?
   heightCm  Float?
+  createdAt DateTime @default(now())
 }
 
 model ToothStatus {
-  id         Int      @id @default(autoincrement())
-  childId    Int
+  id         String   @id @default(uuid())
+  childId    String
   child      Child    @relation(fields: [childId], references: [id])
-  toothLabel String   // z. B. "oben links 1" oder "Zahn 61"
+  toothLabel String   // z. B. "oben links 1" oder "Zahn 61"
   date       DateTime
-  status     String   // z. B. "durchgebrochen", "locker", "fehlend"
+  status     String   // z. B. "durchgebrochen", "locker", "fehlend"
 }
 
 model Vaccine {
-  id        Int      @id @default(autoincrement())
-  childId   Int
+  id        String   @id @default(uuid())
+  childId   String
   child     Child    @relation(fields: [childId], references: [id])
   name      String
   date      DateTime