fix: migration code not working

- read database config from config file
- rename migration file to expected file name format

apps/backend/cmd/migration/main.go

@@ -1,13 +1,37 @@
 package main
 
 import (
+	"context"
+	"flag"
+	"fmt"
 	"log"
+	"os"
 
 	"github.com/get-drexa/drexa/internal/database"
+	"github.com/get-drexa/drexa/internal/drexa"
 )
 
 func main() {
-	if err := database.RunMigrations(); err != nil {
-		log.Fatalf("Failed to run migrations: %v", err)
+	configPath := flag.String("config", "", "path to config file (required)")
+	flag.Parse()
+
+	if *configPath == "" {
+		fmt.Fprintln(os.Stderr, "error: --config is required")
+		flag.Usage()
+		os.Exit(1)
 	}
+
+	config, err := drexa.ConfigFromFile(*configPath)
+	if err != nil {
+		log.Fatalf("failed to load config: %v", err)
+	}
+
+	db := database.NewFromPostgres(config.Database.PostgresURL)
+	defer db.Close()
+
+	log.Println("running migrations...")
+	if err := database.RunMigrations(context.Background(), db); err != nil {
+		log.Fatalf("failed to run migrations: %v", err)
+	}
+	log.Println("migrations completed successfully")
 }