Improve domain UX and migration startup

backend/migrate.js

@@ -1,6 +1,34 @@
 const db = require("./db");
 const migrations = require("./migrations");
 
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function waitForDatabase({
+  retries = 30,
+  delayMs = 2000,
+} = {}) {
+  let lastError;
+
+  for (let attempt = 1; attempt <= retries; attempt++) {
+    try {
+      await db.query("SELECT 1");
+      return;
+    } catch (error) {
+      lastError = error;
+
+      console.log(`Database not ready yet (${attempt}/${retries})`);
+
+      if (attempt < retries) {
+        await sleep(delayMs);
+      }
+    }
+  }
+
+  throw lastError;
+}
+
 async function ensureMigrationsTable() {
   await db.query(`
     CREATE TABLE IF NOT EXISTS schema_migrations (
@@ -21,6 +49,7 @@ async function getAppliedMigrationIds() {
 }
 
 async function runMigrations() {
+  await waitForDatabase();
   await ensureMigrationsTable();
 
   const appliedIds = await getAppliedMigrationIds();
@@ -43,4 +72,5 @@ async function runMigrations() {
 
 module.exports = {
   runMigrations,
+  waitForDatabase,
 };