Adding first working version

backend/scripts/migrate.mjs

@@ -2,6 +2,9 @@ import { readdir, readFile } from 'node:fs/promises'
 import { dirname, resolve } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { Pool } from 'pg'
+import { loadEnv } from './load-env.mjs'
+
+loadEnv()
 
 const __dirname = dirname(fileURLToPath(import.meta.url))
 const migrationsDir = resolve(__dirname, '../src/migrations')
@@ -10,6 +13,16 @@ const connectionString =
 
 const pool = new Pool({ connectionString })
 
+function redactConnectionString(value) {
+  try {
+    const url = new URL(value)
+    if (url.password) url.password = '***'
+    return url.toString()
+  } catch {
+    return value
+  }
+}
+
 try {
   const migrationFiles = (await readdir(migrationsDir))
     .filter((file) => file.endsWith('.sql'))
@@ -21,6 +34,13 @@ try {
     await pool.query(sql)
     console.log(`Applied migration ${migrationPath}`)
   }
+} catch (error) {
+  if (error?.code === 'ECONNREFUSED') {
+    console.error(`Unable to connect to Postgres at ${redactConnectionString(connectionString)}`)
+    console.error('For the local Docker database, start it with `docker compose up -d postgres` from the repo root.')
+    console.error('Then use DATABASE_URL=postgres://ca_studio:ca_studio@localhost:54329/ca_studio_test')
+  }
+  throw error
 } finally {
   await pool.end()
 }