Add initial database setup and user/artist management functionality

api/database/database.go

@@ -0,0 +1,35 @@
+package database
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"time"
+
+	db "zardzul/music-index/sqlc"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+func Connect() (*pgxpool.Pool, *db.Queries, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	databaseURL := os.Getenv("DATABASE_URL")
+	if databaseURL == "" {
+		databaseURL = "postgres://postgres:postgres@localhost:5432/postgres?sslmode=disable"
+	}
+
+	pool, err := pgxpool.New(ctx, databaseURL)
+	if err != nil {
+		return nil, nil, fmt.Errorf("create pool: %w", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		pool.Close()
+		return nil, nil, fmt.Errorf("ping database: %w", err)
+	}
+
+	queries := db.New(pool)
+	return pool, queries, nil
+}