feat: add local auth data model

packages/hoppscotch-backend/prisma/migrations/20260506090000_local_auth/migration.sql

@@ -0,0 +1,21 @@
+-- Add local username/password authentication support.
+ALTER TABLE "User" ADD COLUMN "username" TEXT;
+
+CREATE UNIQUE INDEX "User_username_key" ON "User"("username");
+
+CREATE TABLE "LocalCredential" (
+  "id" TEXT NOT NULL,
+  "userUid" TEXT NOT NULL,
+  "passwordHash" TEXT NOT NULL,
+  "createdOn" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  "updatedOn" TIMESTAMPTZ(3) NOT NULL,
+
+  CONSTRAINT "LocalCredential_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "LocalCredential_userUid_key" ON "LocalCredential"("userUid");
+
+ALTER TABLE "LocalCredential"
+ADD CONSTRAINT "LocalCredential_userUid_fkey"
+FOREIGN KEY ("userUid") REFERENCES "User"("uid")
+ON DELETE CASCADE ON UPDATE CASCADE;

packages/hoppscotch-backend/prisma/schema.prisma

@@ -94,6 +94,7 @@ model TeamEnvironment {
 
 model User {
   uid                  String                @id @default(cuid())
+  username             String?               @unique
   displayName          String?
   email                String?               @unique
   photoURL             String?
@@ -104,6 +105,7 @@ model User {
   createdOn            DateTime              @default(now()) @db.Timestamptz(3)
   lastLoggedOn         DateTime?             @db.Timestamptz(3)
   lastActiveOn         DateTime?             @db.Timestamptz(3)
+  localCredential      LocalCredential?
   providerAccounts     Account[]
   invitedUsers         InvitedUsers[]
   mockServers          MockServer[]
@@ -117,6 +119,15 @@ model User {
   VerificationToken    VerificationToken[]
 }
 
+model LocalCredential {
+  id           String   @id @default(cuid())
+  userUid      String   @unique
+  passwordHash String
+  createdOn    DateTime @default(now()) @db.Timestamptz(3)
+  updatedOn    DateTime @updatedAt @db.Timestamptz(3)
+  user         User     @relation(fields: [userUid], references: [uid], onDelete: Cascade)
+}
+
 model Account {
   id                   String   @id @default(cuid())
   userId               String

packages/hoppscotch-backend/src/user/user.model.ts

@@ -7,6 +7,12 @@ export class User {
   })
   uid: string;
 
+  @Field({
+    nullable: true,
+    description: 'Username of the user',
+  })
+  username?: string;
+
   @Field({
     nullable: true,
     description: 'Name of the user (if fetched)',