feat(csms): add deployment script and database schema for user authentication

apps/csms/src/lib/db.ts

@@ -0,0 +1,24 @@
+import { drizzle } from 'drizzle-orm/node-postgres'
+import { Pool } from 'pg'
+import * as schema from '@/db/schema.js'
+
+let pgPoolInstance: Pool | null = null
+let drizzleInstance: ReturnType<typeof drizzle> | null = null
+
+export const useDrizzle = () => {
+  if (!pgPoolInstance || !drizzleInstance) {
+    pgPoolInstance = new Pool({
+      connectionString: process.env.DATABASE_CONNECTION_STRING,
+    })
+    drizzleInstance = drizzle({ client: pgPoolInstance, schema })
+  }
+  return drizzleInstance
+}
+
+export const closeDrizzle = () => {
+  if (pgPoolInstance) {
+    pgPoolInstance.end()
+    pgPoolInstance = null
+    drizzleInstance = null
+  }
+}