Initial vibeproxy implementation

Self-contained HTTP/HTTPS/TCP/UDP reverse proxy manager written in Go,
with SQLite storage, a Bootstrap 5 admin UI (Go templates, no JS
framework), and a REST API under /api/v1.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QTXFrNP1imCW7jtfL5SZrw

internal/database/repo_users.go

@@ -0,0 +1,58 @@
+package database
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	"github.com/owen/vibeproxy/internal/models"
+)
+
+var ErrNotFound = errors.New("not found")
+
+const timeFmt = "2006-01-02T15:04:05.000Z"
+
+func parseTime(s string) time.Time {
+	t, _ := time.Parse(timeFmt, s)
+	return t
+}
+
+func GetUserByUsername(db *sql.DB, username string) (*models.User, error) {
+	row := db.QueryRow(`SELECT id, username, password_hash, must_change_pw, created_at, updated_at FROM users WHERE username = ?`, username)
+	u := &models.User{}
+	var mustChange int
+	var created, updated string
+	if err := row.Scan(&u.ID, &u.Username, &u.PasswordHash, &mustChange, &created, &updated); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+	u.MustChangePW = mustChange == 1
+	u.CreatedAt = parseTime(created)
+	u.UpdatedAt = parseTime(updated)
+	return u, nil
+}
+
+func CountUsers(db *sql.DB) (int, error) {
+	var n int
+	err := db.QueryRow(`SELECT COUNT(*) FROM users`).Scan(&n)
+	return n, err
+}
+
+func CreateUser(db *sql.DB, username, passwordHash string, mustChange bool) error {
+	_, err := db.Exec(`INSERT INTO users (username, password_hash, must_change_pw) VALUES (?, ?, ?)`, username, passwordHash, boolToInt(mustChange))
+	return err
+}
+
+func UpdateUserPassword(db *sql.DB, username, passwordHash string, mustChange bool) error {
+	_, err := db.Exec(`UPDATE users SET password_hash = ?, must_change_pw = ?, updated_at = strftime('%Y-%m-%dT%H:%M:%fZ','now') WHERE username = ?`, passwordHash, boolToInt(mustChange), username)
+	return err
+}
+
+func boolToInt(b bool) int {
+	if b {
+		return 1
+	}
+	return 0
+}