Add jukebox_maker web app v1.0

Go web application for filling USB drives with media files.
Runs in Docker on Unraid with /media, /mnt/usb, /config volumes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/db/db.go

@@ -0,0 +1,92 @@
+package db
+
+import (
+	"database/sql"
+	"time"
+
+	_ "modernc.org/sqlite"
+)
+
+type DB struct {
+	sql *sql.DB
+}
+
+type CopyRecord struct {
+	DiskID     string
+	SourcePath string
+	FileSize   int64
+	CopiedAt   time.Time
+}
+
+func Open(path string) (*DB, error) {
+	conn, err := sql.Open("sqlite", path+"?_journal=WAL&_timeout=5000")
+	if err != nil {
+		return nil, err
+	}
+	conn.SetMaxOpenConns(1)
+	d := &DB{sql: conn}
+	if err := d.migrate(); err != nil {
+		conn.Close()
+		return nil, err
+	}
+	return d, nil
+}
+
+func (d *DB) Close() error {
+	return d.sql.Close()
+}
+
+func (d *DB) migrate() error {
+	_, err := d.sql.Exec(`
+		CREATE TABLE IF NOT EXISTS copy_history (
+			id          INTEGER PRIMARY KEY AUTOINCREMENT,
+			disk_id     TEXT    NOT NULL,
+			source_path TEXT    NOT NULL,
+			file_size   INTEGER NOT NULL DEFAULT 0,
+			copied_at   DATETIME NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ','now'))
+		);
+		CREATE UNIQUE INDEX IF NOT EXISTS idx_copy_history_disk_path
+			ON copy_history (disk_id, source_path);
+	`)
+	return err
+}
+
+func (d *DB) WasCopied(diskID, sourcePath string) (bool, error) {
+	var n int
+	err := d.sql.QueryRow(
+		`SELECT COUNT(*) FROM copy_history WHERE disk_id=? AND source_path=?`,
+		diskID, sourcePath,
+	).Scan(&n)
+	return n > 0, err
+}
+
+func (d *DB) RecordCopy(rec CopyRecord) error {
+	t := rec.CopiedAt
+	if t.IsZero() {
+		t = time.Now().UTC()
+	}
+	_, err := d.sql.Exec(
+		`INSERT OR IGNORE INTO copy_history (disk_id, source_path, file_size, copied_at) VALUES (?,?,?,?)`,
+		rec.DiskID, rec.SourcePath, rec.FileSize, t.Format(time.RFC3339),
+	)
+	return err
+}
+
+func (d *DB) CopiedPaths(diskID string) (map[string]struct{}, error) {
+	rows, err := d.sql.Query(
+		`SELECT source_path FROM copy_history WHERE disk_id=?`, diskID,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	m := make(map[string]struct{})
+	for rows.Next() {
+		var p string
+		if err := rows.Scan(&p); err != nil {
+			return nil, err
+		}
+		m[p] = struct{}{}
+	}
+	return m, rows.Err()
+}