diff --git a/.gitignore b/.gitignore
index cb2b88a..169a5a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,6 @@ Thumbs.db
 
 # Misc
 .cache/
+
+# Claude Code per-user settings
+.claude/settings.local.json
diff --git a/package.json b/package.json
index 5293a18..c009aa6 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,12 @@
     "typecheck": "tsc -b",
     "test": "pnpm --filter \"./packages/*\" --filter \"./apps/*\" -r --if-present test",
     "test:e2e": "pnpm --filter @ketopath/web test:e2e",
+    "db:generate": "pnpm --filter @ketopath/db db:generate",
+    "db:migrate": "pnpm --filter @ketopath/db db:migrate",
+    "db:migrate:deploy": "pnpm --filter @ketopath/db db:migrate:deploy",
+    "db:studio": "pnpm --filter @ketopath/db db:studio",
+    "db:format": "pnpm --filter @ketopath/db db:format",
+    "db:seed": "pnpm --filter @ketopath/db db:seed",
     "prepare": "husky"
   },
   "devDependencies": {
diff --git a/packages/db/.env.example b/packages/db/.env.example
new file mode 100644
index 0000000..b9e34d3
--- /dev/null
+++ b/packages/db/.env.example
@@ -0,0 +1 @@
+DATABASE_URL="postgresql://luciano:luciano%40@localhost:5432/ketopath?schema=public"
diff --git a/packages/db/.gitignore b/packages/db/.gitignore
new file mode 100644
index 0000000..f8028b9
--- /dev/null
+++ b/packages/db/.gitignore
@@ -0,0 +1,2 @@
+.env
+*.tsbuildinfo
diff --git a/packages/db/package.json b/packages/db/package.json
index ebdd467..6a34cf6 100644
--- a/packages/db/package.json
+++ b/packages/db/package.json
@@ -10,10 +10,25 @@
   },
   "scripts": {
     "typecheck": "tsc --noEmit",
-    "lint": "eslint src --max-warnings=0"
+    "lint": "eslint src --max-warnings=0",
+    "db:generate": "prisma generate",
+    "db:migrate": "prisma migrate dev",
+    "db:migrate:deploy": "prisma migrate deploy",
+    "db:studio": "prisma studio",
+    "db:format": "prisma format",
+    "db:seed": "tsx prisma/seed.ts"
+  },
+  "dependencies": {
+    "@prisma/client": "^5.18.0"
   },
   "devDependencies": {
     "@ketopath/eslint-config": "workspace:*",
-    "@ketopath/tsconfig": "workspace:*"
+    "@ketopath/tsconfig": "workspace:*",
+    "prisma": "^5.18.0",
+    "tsx": "^4.16.2"
+  },
+  "prisma": {
+    "schema": "prisma/schema.prisma",
+    "seed": "tsx prisma/seed.ts"
   }
 }
diff --git a/packages/db/prisma/schema.prisma b/packages/db/prisma/schema.prisma
new file mode 100644
index 0000000..b0e94e9
--- /dev/null
+++ b/packages/db/prisma/schema.prisma
@@ -0,0 +1,101 @@
+// KetoPath — schema Prisma
+// Schema iniziale: solo le 3 entità di base (User, Profile, Preferences).
+// Le altre entità del PRD §8 (MealPlan, Recipe, WeightEntry, ecc.) verranno
+// aggiunte in step successivi, allineate alle feature corrispondenti.
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+enum Role {
+  USER
+  COACH
+}
+
+enum Gender {
+  MALE
+  FEMALE
+  OTHER
+}
+
+enum ActivityLevel {
+  SEDENTARY
+  LIGHT
+  MODERATE
+  INTENSE
+}
+
+enum Phase {
+  INTENSIVE
+  TRANSITION
+  MAINTENANCE
+}
+
+enum CookingTime {
+  LOW
+  MEDIUM
+  HIGH
+}
+
+enum FastingProtocol {
+  FOURTEEN_TEN
+  SIXTEEN_EIGHT
+  EIGHTEEN_SIX
+  TWENTY_FOUR
+  ESE_24
+  FIVE_TWO
+}
+
+model User {
+  id        String   @id @default(cuid())
+  email     String   @unique
+  role      Role     @default(USER)
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+
+  profile     Profile?
+  preferences Preferences?
+
+  @@map("users")
+}
+
+model Profile {
+  id              String        @id @default(cuid())
+  userId          String        @unique @map("user_id")
+  age             Int
+  gender          Gender
+  heightCm        Int           @map("height_cm")
+  weightStartKg   Decimal       @map("weight_start_kg") @db.Decimal(5, 2)
+  weightCurrentKg Decimal       @map("weight_current_kg") @db.Decimal(5, 2)
+  weightGoalKg    Decimal       @map("weight_goal_kg") @db.Decimal(5, 2)
+  activityLevel   ActivityLevel @map("activity_level")
+  targetDate      DateTime?     @map("target_date") @db.Date
+  currentPhase    Phase         @default(INTENSIVE) @map("current_phase")
+  createdAt       DateTime      @default(now()) @map("created_at")
+  updatedAt       DateTime      @updatedAt @map("updated_at")
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("profiles")
+}
+
+model Preferences {
+  id                   String           @id @default(cuid())
+  userId               String           @unique @map("user_id")
+  exclusions           String[]         @default([])
+  cuisinePreferences   String[]         @default([]) @map("cuisine_preferences")
+  cookingTime          CookingTime      @default(MEDIUM) @map("cooking_time")
+  fastingProtocol      FastingProtocol? @map("fasting_protocol")
+  notificationSettings Json             @default("{}") @map("notification_settings")
+  createdAt            DateTime         @default(now()) @map("created_at")
+  updatedAt            DateTime         @updatedAt @map("updated_at")
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@map("preferences")
+}
diff --git a/packages/db/prisma/seed.ts b/packages/db/prisma/seed.ts
new file mode 100644
index 0000000..46e0e8d
--- /dev/null
+++ b/packages/db/prisma/seed.ts
@@ -0,0 +1,20 @@
+import { PrismaClient } from '@prisma/client';
+
+const prisma = new PrismaClient();
+
+async function main(): Promise<void> {
+  // TODO: dati di seed (utenti demo, ricette base, ecc.) — verranno aggiunti
+  // quando le entità relative saranno modellate.
+  // eslint-disable-next-line no-console
+  console.info('[seed] nothing to seed yet');
+}
+
+main()
+  .catch((err: unknown) => {
+    // eslint-disable-next-line no-console
+    console.error(err);
+    process.exitCode = 1;
+  })
+  .finally(() => {
+    void prisma.$disconnect();
+  });
diff --git a/packages/db/src/client.ts b/packages/db/src/client.ts
new file mode 100644
index 0000000..655e39f
--- /dev/null
+++ b/packages/db/src/client.ts
@@ -0,0 +1,13 @@
+import { PrismaClient } from '@prisma/client';
+
+const globalForPrisma = globalThis as unknown as { prisma?: PrismaClient };
+
+export const prisma: PrismaClient =
+  globalForPrisma.prisma ??
+  new PrismaClient({
+    log: process.env.NODE_ENV === 'development' ? ['warn', 'error'] : ['error'],
+  });
+
+if (process.env.NODE_ENV !== 'production') {
+  globalForPrisma.prisma = prisma;
+}
diff --git a/packages/db/src/index.ts b/packages/db/src/index.ts
index cb0ff5c..e733bd1 100644
--- a/packages/db/src/index.ts
+++ b/packages/db/src/index.ts
@@ -1 +1,11 @@
-export {};
+export { prisma } from './client.js';
+export {
+  ActivityLevel,
+  CookingTime,
+  FastingProtocol,
+  Gender,
+  Phase,
+  Prisma,
+  Role,
+} from '@prisma/client';
+export type { Preferences, Profile, User } from '@prisma/client';
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 7ce3076..acb7b3d 100644
Binary files a/pnpm-lock.yaml and b/pnpm-lock.yaml differ