initial commit

src/backend/prisma/schema.prisma

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+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+model Company {
+  id        Int      @id @default(autoincrement())
+  name      String
+  vatNumber String?  @unique
+  email     String?
+  phone     String?
+  address   String?
+  city      String?
+  isActive  Boolean  @default(true)
+  notes     String?
+  externalId String?
+  
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  workers   Worker[]
+  sites     Site[]
+  notifications Notification[]
+}
+
+model Site {
+  id        Int      @id @default(autoincrement())
+  name      String   // e.g. "Sede Principale", "Cantiere A"
+  address   String?
+  city      String?
+  companyId Int
+  company   Company  @relation(fields: [companyId], references: [id], onDelete: Cascade)
+  
+  isActive  Boolean  @default(true)
+
+  workers   Worker[]
+}
+
+model Worker {
+  id        Int      @id @default(autoincrement())
+  firstName String
+  lastName  String
+  taxCode   String?  @unique // Codice Fiscale
+  jobTitle  String?  // Mansione
+  email     String?
+  phone     String?
+  
+  companyId Int
+  company   Company  @relation(fields: [companyId], references: [id])
+  
+  siteId    Int?
+  site      Site?    @relation(fields: [siteId], references: [id])
+
+  isActive  Boolean  @default(true)
+  hiringDate DateTime?
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  events    TrainingEvent[]
+}
+
+model Course {
+  id            Int      @id @default(autoincrement())
+  title         String
+  code          String   @default("TEMP") // Temporaneo default per migrazione, poi rimuovo o rendo unique
+  description   String?
+  validityYears Int      // Durata validita in anni (es. 5)
+  hasPostExpiryReminder Boolean @default(false)
+  isSafety      Boolean  @default(true) 
+  
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+
+  events        TrainingEvent[]
+}
+
+model TrainingEvent {
+  id            Int      @id @default(autoincrement())
+  
+  workerId      Int
+  worker        Worker   @relation(fields: [workerId], references: [id], onDelete: Cascade)
+  
+  courseId      Int
+  course        Course   @relation(fields: [courseId], references: [id])
+  
+  eventDate     DateTime // Data del corso
+  expiryDate    DateTime? // Data scadenza calcolata
+  
+  provider      String?  // Ente formatore
+  certificateUrl String? // Link al file PDF
+
+  status        String   @default("VALID") // VALID, EXPIRING, EXPIRED
+  
+  notes         String?
+
+  createdAt     DateTime @default(now())
+  updatedAt     DateTime @updatedAt
+}
+
+model Notification {
+  id          Int      @id @default(autoincrement())
+  companyId   Int
+  company     Company  @relation(fields: [companyId], references: [id])
+  
+  type        String   // 'EXPIRING_REMINDER', 'EXPIRED_ALERT'
+  status      String   @default("PENDING") // PENDING, SENT, FAILED
+  
+  subject     String
+  content     String   // HTML content or JSON data to render
+  
+  sentAt      DateTime?
+  scheduledFor DateTime?
+  
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+}
+
+model User {
+  id        Int      @id @default(autoincrement())
+  email     String   @unique
+  password  String
+  name      String?
+  role      String   @default("ADMIN") // ADMIN, USER
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}