Mehrere Subdomains pro Benutzer + README

- subdomains-Tabelle (n DNS-Namen je Benutzer) inkl. Migration vom alten
  Einzel-Subdomain-Schema in database.init_db()
- Benutzeranlage/Verwaltung: mehrere Subdomains hinzufuegen/entfernen
- /nic/update aktualisiert alle Subdomains des Benutzers bzw. die per
  ?hostname= gewaehlte(n); eine Antwortzeile je Subdomain
- Dashboard/Users-Templates auf das neue Modell umgestellt
- README.md mit Setup, Plesk-Konfig, Router-Einrichtung und Endpoint-Doku
- .gitignore: __pycache__/ und *.pyc

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/database.py

@@ -6,13 +6,21 @@ DB_PATH = os.environ.get('DB_PATH', '/data/dyndns.db')
 
 
 def get_db():
+    db_dir = os.path.dirname(DB_PATH)
+    if db_dir:
+        os.makedirs(db_dir, exist_ok=True)
     conn = sqlite3.connect(DB_PATH)
     conn.row_factory = sqlite3.Row
     return conn
 
 
+def _columns(db, table):
+    return [r['name'] for r in db.execute(f'PRAGMA table_info({table})').fetchall()]
+
+
 def init_db():
     db = get_db()
+
     db.executescript('''
         CREATE TABLE IF NOT EXISTS settings (
             key   TEXT PRIMARY KEY,
@@ -29,16 +37,24 @@ def init_db():
             id            INTEGER PRIMARY KEY AUTOINCREMENT,
             username      TEXT UNIQUE NOT NULL,
             password_hash TEXT NOT NULL,
-            subdomain     TEXT UNIQUE NOT NULL,
-            current_ip    TEXT,
-            last_updated  TEXT,
             active        INTEGER NOT NULL DEFAULT 1,
             created_at    TEXT NOT NULL DEFAULT (datetime('now'))
         );
 
+        CREATE TABLE IF NOT EXISTS subdomains (
+            id             INTEGER PRIMARY KEY AUTOINCREMENT,
+            dyndns_user_id INTEGER NOT NULL,
+            subdomain      TEXT UNIQUE NOT NULL,
+            current_ip     TEXT,
+            last_updated   TEXT,
+            created_at     TEXT NOT NULL DEFAULT (datetime('now')),
+            FOREIGN KEY (dyndns_user_id) REFERENCES dyndns_users(id)
+        );
+
         CREATE TABLE IF NOT EXISTS update_log (
             id              INTEGER PRIMARY KEY AUTOINCREMENT,
             dyndns_user_id  INTEGER NOT NULL,
+            subdomain_id    INTEGER,
             old_ip          TEXT,
             new_ip          TEXT NOT NULL,
             result          TEXT NOT NULL,
@@ -47,6 +63,32 @@ def init_db():
         );
     ''')
 
+    # --- Migration vom alten Schema (genau eine Subdomain pro Benutzer) ---
+    # Früher trug dyndns_users die Spalten subdomain/current_ip/last_updated
+    # direkt. Diese werden in die neue subdomains-Tabelle überführt.
+    if 'subdomain' in _columns(db, 'dyndns_users'):
+        db.execute('''
+            INSERT OR IGNORE INTO subdomains (dyndns_user_id, subdomain, current_ip, last_updated)
+            SELECT id, subdomain, current_ip, last_updated FROM dyndns_users
+        ''')
+        db.executescript('''
+            CREATE TABLE dyndns_users_new (
+                id            INTEGER PRIMARY KEY AUTOINCREMENT,
+                username      TEXT UNIQUE NOT NULL,
+                password_hash TEXT NOT NULL,
+                active        INTEGER NOT NULL DEFAULT 1,
+                created_at    TEXT NOT NULL DEFAULT (datetime('now'))
+            );
+            INSERT INTO dyndns_users_new (id, username, password_hash, active, created_at)
+                SELECT id, username, password_hash, active, created_at FROM dyndns_users;
+            DROP TABLE dyndns_users;
+            ALTER TABLE dyndns_users_new RENAME TO dyndns_users;
+        ''')
+
+    # update_log: subdomain_id nachrüsten, falls noch altes Schema
+    if 'subdomain_id' not in _columns(db, 'update_log'):
+        db.execute('ALTER TABLE update_log ADD COLUMN subdomain_id INTEGER')
+
     existing = db.execute('SELECT id FROM admin_users LIMIT 1').fetchone()
     if not existing:
         db.execute(