Added Backend

backend/db/schema/auth_tenant_users.ts

@@ -0,0 +1,22 @@
+import { pgTable, uuid, bigint, timestamp } from "drizzle-orm/pg-core"
+import { authUsers } from "./auth_users"
+
+export const authTenantUsers = pgTable(
+    "auth_tenant_users",
+    {
+        created_at: timestamp("created_at", { withTimezone: true })
+            .notNull()
+            .defaultNow(),
+
+        tenant_id: bigint("tenant_id", { mode: "number" }).notNull(),
+        user_id: uuid("user_id").notNull(),
+
+        created_by: uuid("created_by").references(() => authUsers.id),
+    },
+    (table) => ({
+        primaryKey: [table.tenant_id, table.user_id],
+    })
+)
+
+export type AuthTenantUser = typeof authTenantUsers.$inferSelect
+export type NewAuthTenantUser = typeof authTenantUsers.$inferInsert