diff --git a/apps/api/package.json b/apps/api/package.json
index cdaecee..9560373 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -15,6 +15,7 @@
     "db:migrate": "prisma migrate dev",
     "db:seed": "ts-node prisma/seed.ts",
     "db:reset": "prisma migrate reset --force && ts-node prisma/seed.ts",
+    "db:use-sqlite": "cp prisma/schema.sqlite.prisma prisma/schema.prisma",
     "clean": "rimraf dist"
   },
   "dependencies": {
diff --git a/apps/api/prisma/schema.prisma b/apps/api/prisma/schema.prisma
index 845a70f..61336b8 100644
--- a/apps/api/prisma/schema.prisma
+++ b/apps/api/prisma/schema.prisma
@@ -1,5 +1,5 @@
 datasource db {
-  provider = "sqlite"
+  provider = "postgresql"
   url      = env("DATABASE_URL")
 }
 
diff --git a/apps/api/prisma/schema.sqlite.prisma b/apps/api/prisma/schema.sqlite.prisma
new file mode 100644
index 0000000..845a70f
--- /dev/null
+++ b/apps/api/prisma/schema.sqlite.prisma
@@ -0,0 +1,144 @@
+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+model Venue {
+  id        String   @id @default(uuid())
+  name      String
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  devices        Device[]
+  clientUsers    ClientUser[]
+  tabOwnerships  TabOwnership[]
+  remoteCommands RemoteCommand[]
+  auditLogs      AuditLog[]
+  regCodes       RegistrationCode[]
+}
+
+model Device {
+  id             String    @id @default(uuid())
+  venueId        String
+  name           String
+  tokenHash      String    @unique
+  tokenPrefix    String
+  tokenExpiresAt DateTime
+  lastSeenAt     DateTime  @default(now())
+  revokedAt      DateTime?
+  createdAt      DateTime  @default(now())
+
+  venue          Venue              @relation(fields: [venueId], references: [id])
+  tabSnapshots   OpenTabSnapshot[]
+  tabOwnerships  TabOwnership[]
+  remoteCommands RemoteCommand[]
+
+  @@index([venueId, revokedAt])
+}
+
+model ClientUser {
+  id           String   @id @default(uuid())
+  venueId      String
+  email        String   @unique
+  passwordHash String
+  name         String
+  role         String   @default("viewer")
+  createdAt    DateTime @default(now())
+
+  venue Venue @relation(fields: [venueId], references: [id])
+
+  @@index([venueId])
+}
+
+model RegistrationCode {
+  id        String   @id @default(uuid())
+  venueId   String
+  code      String   @unique
+  expiresAt DateTime
+  usedAt    DateTime?
+  createdAt DateTime @default(now())
+
+  venue Venue @relation(fields: [venueId], references: [id])
+
+  @@index([venueId])
+}
+
+model OpenTabSnapshot {
+  id           String   @id @default(uuid())
+  deviceId     String
+  tabId        String
+  customerName String
+  version      Int
+  totalInCents Int
+  itemCount    Int
+  reportedAt   DateTime
+
+  device Device @relation(fields: [deviceId], references: [id])
+
+  @@unique([deviceId, tabId])
+  @@index([deviceId])
+  @@index([tabId, reportedAt])
+}
+
+model TabOwnership {
+  tabId          String
+  venueId        String
+  deviceId       String
+  lastReportedAt DateTime
+
+  venue  Venue  @relation(fields: [venueId], references: [id])
+  device Device @relation(fields: [deviceId], references: [id])
+
+  @@id([venueId, tabId])
+}
+
+model RemoteCommand {
+  id              String    @id @default(uuid())
+  venueId         String
+  deviceId        String
+  targetTabId     String
+  type            String    @default("close_tab")
+  expectedVersion Int
+  paymentMethod   String
+  requestedBy     String
+  status          String    @default("pending")
+  result          String?
+  acknowledgedAt  DateTime?
+  createdAt       DateTime  @default(now())
+  expiresAt       DateTime
+
+  venue  Venue  @relation(fields: [venueId], references: [id])
+  device Device @relation(fields: [deviceId], references: [id])
+
+  @@index([deviceId, status, createdAt])
+  @@index([venueId, status, createdAt])
+}
+
+model AuditLog {
+  id        String   @id @default(uuid())
+  venueId   String
+  actorType String
+  actorId   String
+  action    String
+  details   String?
+  createdAt DateTime @default(now())
+
+  venue Venue @relation(fields: [venueId], references: [id])
+
+  @@index([venueId, createdAt])
+}
+
+model RefreshToken {
+  id        String   @id @default(uuid())
+  userId    String
+  tokenHash String   @unique
+  expiresAt DateTime
+  revokedAt DateTime?
+  createdAt DateTime @default(now())
+
+  @@index([userId])
+}
\ No newline at end of file