Add missing docstrings and examples

src/ddns_service/dns.py

@@ -37,6 +37,12 @@ def encode_dnsname(hostname):
 
     Raises:
         EncodingError: If hostname is invalid.
+
+    Example:
+        >>> encode_dnsname("münchen")
+        'xn--mnchen-3ya'
+        >>> encode_dnsname("example.com.")
+        'example.com'
     """
     hostname = hostname.lower().strip()
 
@@ -84,6 +90,24 @@ def encode_dnsname(hostname):
 
 
 def detect_ip_type(ip):
+    """
+    Detect IP address type and normalize.
+
+    Args:
+        ip: IP address string.
+
+    Returns:
+        Tuple of (record_type, normalized_ip).
+
+    Raises:
+        ValueError: If IP address is invalid.
+
+    Example:
+        >>> detect_ip_type("192.168.1.1")
+        ('A', '192.168.1.1')
+        >>> detect_ip_type("2001:db8::1")
+        ('AAAA', '2001:db8::1')
+    """
     try:
         addr = ipaddress.ip_address(ip)
         if isinstance(addr, ipaddress.IPv4Address):
@@ -127,6 +151,16 @@ def parse_bind_key_file(path):
 
     Raises:
         DNSError: If parsing fails.
+
+    Example:
+        Key file contents::
+
+            key "ddns-key." {
+                algorithm hmac-sha256;
+                secret "base64secret==";
+            };
+
+        >>> keyring, algo = parse_bind_key_file("/etc/bind/ddns.key")
     """
     if not path:
         return None, None
@@ -324,13 +358,17 @@ class DNSService:
         Update a DNS record for the given hostname.
 
         Args:
-            hostname: Fully qualified hostname.
+            hostname: Hostname (without zone suffix).
             zone: DNS zone name.
             ip: IP address to set.
             ttl: DNS record TTL.
 
         Raises:
             DNSError: If update fails.
+
+        Example:
+            >>> dns_service.update_record("myhost", "example.com", "192.168.1.1", 60)
+            >>> dns_service.update_record("myhost", "example.com", "2001:db8::1", 60)
         """
         try:
             record_type, normalized_ip = detect_ip_type(ip)

src/ddns_service/models.py

@@ -19,6 +19,22 @@ from peewee import (
 )
 from playhouse.pool import PooledMySQLDatabase
 
+# Re-export DoesNotExist and EncodingError for convenience
+__all__ = [
+    'db',
+    'DATABASE_VERSION',
+    'User',
+    'Hostname',
+    'Version',
+    'init_database',
+    'create_tables',
+    'get_user',
+    'get_hostname',
+    'get_hostname_for_user',
+    'DoesNotExist',
+    'EncodingError',
+]
+
 # Database proxy (initialized later with actual backend)
 db = DatabaseProxy()
 
@@ -269,6 +285,11 @@ def get_user(username: str):
 
     Raises:
         DoesNotExist: If user not found.
+
+    Example:
+        >>> user = get_user("alice")
+        >>> print(user.email)
+        'alice@example.com'
     """
     return User.get(User.username == username)
 
@@ -286,6 +307,11 @@ def get_hostname(hostname, zone):
 
     Raises:
         DoesNotExist: If hostname not found.
+
+    Example:
+        >>> host = get_hostname("myhost", "example.com")
+        >>> print(host.last_ipv4)
+        '192.168.1.1'
     """
     return Hostname.get(
         (Hostname.hostname == hostname) & (Hostname.zone == zone)
@@ -297,7 +323,7 @@ def get_hostname_for_user(hostname: str, user: User):
     Get hostname owned by specific user.
 
     Args:
-        hostname: Hostname to look up.
+        hostname: Hostname to look up (FQDN).
         user: User who should own the hostname.
 
     Returns:
@@ -305,23 +331,10 @@ def get_hostname_for_user(hostname: str, user: User):
 
     Raises:
         DoesNotExist: If hostname not found or not owned by user.
+
+    Example:
+        >>> user = get_user("alice")
+        >>> host = get_hostname_for_user("myhost.example.com", user)
     """
     fqdn = fn.Concat(Hostname.hostname, '.', Hostname.zone)
     return Hostname.get((fqdn == hostname) & (Hostname.user == user))
-
-
-# Re-export DoesNotExist and EncodingError for convenience
-__all__ = [
-    'db',
-    'DATABASE_VERSION',
-    'User',
-    'Hostname',
-    'Version',
-    'init_database',
-    'create_tables',
-    'get_user',
-    'get_hostname',
-    'get_hostname_for_user',
-    'DoesNotExist',
-    'EncodingError',
-]