Complete V1 scaffold

internal/repository/postgres/db.go

@@ -0,0 +1,68 @@
+package postgres
+
+import (
+	"database/sql"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	_ "github.com/lib/pq"
+)
+
+// NewDB opens a PostgreSQL database connection and sets up connection pooling.
+func NewDB(connStr string) (*sql.DB, error) {
+	db, err := sql.Open("postgres", connStr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open database: %w", err)
+	}
+
+	// Configure connection pool
+	db.SetMaxOpenConns(25)
+	db.SetMaxIdleConns(5)
+
+	// Ping to verify connection
+	if err := db.Ping(); err != nil {
+		return nil, fmt.Errorf("failed to ping database: %w", err)
+	}
+
+	return db, nil
+}
+
+// RunMigrations reads and executes SQL migration files from a directory.
+func RunMigrations(db *sql.DB, migrationsPath string) error {
+	// Check if migrations directory exists
+	if _, err := os.Stat(migrationsPath); os.IsNotExist(err) {
+		return fmt.Errorf("migrations directory not found: %s", migrationsPath)
+	}
+
+	// Read all SQL files from the migrations directory
+	files, err := os.ReadDir(migrationsPath)
+	if err != nil {
+		return fmt.Errorf("failed to read migrations directory: %w", err)
+	}
+
+	// Sort and filter SQL files
+	var sqlFiles []string
+	for _, file := range files {
+		if !file.IsDir() && strings.HasSuffix(file.Name(), ".sql") {
+			sqlFiles = append(sqlFiles, file.Name())
+		}
+	}
+
+	// Execute each migration file in order
+	for _, filename := range sqlFiles {
+		filePath := filepath.Join(migrationsPath, filename)
+		content, err := os.ReadFile(filePath)
+		if err != nil {
+			return fmt.Errorf("failed to read migration file %s: %w", filename, err)
+		}
+
+		// Execute the SQL content
+		if _, err := db.Exec(string(content)); err != nil {
+			return fmt.Errorf("failed to execute migration %s: %w", filename, err)
+		}
+	}
+
+	return nil
+}