feat(db): @mosaic/db — Drizzle schema, PG connection, migrations (#67)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/db/src/migrate.ts

@@ -0,0 +1,18 @@
+import { dirname, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { drizzle } from 'drizzle-orm/postgres-js';
+import { migrate } from 'drizzle-orm/postgres-js/migrator';
+import postgres from 'postgres';
+import { DEFAULT_DATABASE_URL } from './defaults.js';
+
+export async function runMigrations(url?: string): Promise<void> {
+  const connectionString = url ?? process.env['DATABASE_URL'] ?? DEFAULT_DATABASE_URL;
+  const sql = postgres(connectionString, { max: 1 });
+  const db = drizzle(sql);
+  const __dirname = dirname(fileURLToPath(import.meta.url));
+  try {
+    await migrate(db, { migrationsFolder: resolve(__dirname, '../drizzle') });
+  } finally {
+    await sql.end();
+  }
+}