feat: add user schema with PostgreSQL integration using Drizzle ORM

backend/src/database/schemas/index.ts

@@ -0,0 +1 @@
+export * from './users';

backend/src/database/schemas/users.ts

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+import {pgTable, varchar, timestamp, uuid, pgEnum, index} from 'drizzle-orm/pg-core';
+
+export const userStatus = pgEnum("user_status", ["active", "verification", "suspended", "pending", "deleted"])
+
+export const users = pgTable('users', {
+  status: userStatus('status').default('pending').notNull(),
+  uuid: uuid().primaryKey().defaultRandom(),
+  email: varchar('email', { length: 128 }).notNull().unique(),
+  username: varchar('username', { length: 32 }).notNull().unique(),
+  displayName: varchar('display_name', { length: 32 }),
+  passwordHash: varchar('password_hash', { length: 72 }).notNull(),
+  createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),
+  updatedAt: timestamp('updated_at', { withTimezone: true }).notNull().defaultNow(),
+  gdprAcceptation: timestamp('gdpr_acceptation', { withTimezone: true }),
+}, (table) => ({
+  uuidIdx: index('users_uuid_idx').on(table.uuid),
+  emailIdx: index('users_email_idx').on(table.email),
+  usernameIdx: index('users_username_idx').on(table.username),
+}));
+
+export type UserInDb = typeof users.$inferSelect;
+export type NewUserInDb = typeof users.$inferInsert;