fix: serialize profile reset operations

packages/infra/prisma/gateway.prisma

@@ -174,6 +174,8 @@ model GatewayRuntimeAction {
 }
 
 model GatewayOperation {
+  /// A partial unique index in the gateway migration chain permits only one
+  /// QUEUED or RUNNING operation per profile.
   id                String                 @id @default(uuid())
   profileName       String                 @map("profile_name")
   profile           GatewayProfile         @relation(fields: [profileName], references: [profileName], onDelete: Cascade)
@@ -189,10 +191,15 @@ model GatewayOperation {
   startedAt         DateTime?              @map("started_at")
   completedAt       DateTime?              @map("completed_at")
   error             String?
+  leaseOwner        String?                @map("lease_owner")
+  leaseUntil        DateTime?              @map("lease_until")
+  heartbeatAt       DateTime?              @map("heartbeat_at")
+  attempts          Int                    @default(0)
   createdAt         DateTime               @default(now()) @map("created_at")
   updatedAt         DateTime               @updatedAt @map("updated_at")
 
   @@index([status, scheduledAt, createdAt])
+  @@index([status, leaseUntil, createdAt])
   @@index([profileName, createdAt])
   @@map("gateway_operation")
 }