Fix database scheme and introduce automatic database migration

src/ddns_service/cli.py

@@ -15,13 +15,6 @@ from .models import (
 from .validation import encode_hostname, encode_zone, ValidationError
 
 
-def cmd_init_db(args, app):
-    """Initialize database tables."""
-    create_tables()
-    print("Database tables created.")
-    return 0
-
-
 def cmd_user_list(args, app):
     """List all users."""
     users = User.select()
@@ -198,9 +191,11 @@ def cmd_hostname_add(args, app):
         print(f"Error: User '{username}' not found.")
         return 1
 
-    # Check if hostname exists
-    if Hostname.select().where(Hostname.hostname == hostname_str).exists():
-        print(f"Error: Hostname '{hostname_str}' already exists.")
+    # Check if hostname+zone exists
+    if Hostname.select().where(
+        (Hostname.hostname == hostname_str) & (Hostname.zone == zone)
+    ).exists():
+        print(f"Error: Hostname '{hostname_str}' in zone '{zone}' exists.")
         return 1
 
     # Create hostname
@@ -217,17 +212,18 @@ def cmd_hostname_add(args, app):
 
 def cmd_hostname_delete(args, app):
     """Delete a hostname."""
-    # Validate and encode hostname
+    # Validate and encode hostname and zone
     try:
         hostname_str = encode_hostname(args.hostname)
+        zone = encode_zone(args.zone)
     except ValidationError as e:
         print(f"Error: {e}")
         return 1
 
     try:
-        hostname = get_hostname(hostname_str)
+        hostname = get_hostname(hostname_str, zone)
     except DoesNotExist:
-        print(f"Error: Hostname '{hostname_str}' not found.")
+        print(f"Error: Hostname '{hostname_str}' in zone '{zone}' not found.")
         return 1
 
     # Delete DNS records if active
@@ -262,17 +258,18 @@ def cmd_hostname_delete(args, app):
 
 def cmd_hostname_modify(args, app):
     """Modify hostname settings."""
-    # Validate and encode hostname
+    # Validate and encode hostname and zone
     try:
         hostname_str = encode_hostname(args.hostname)
+        zone = encode_zone(args.zone)
     except ValidationError as e:
         print(f"Error: {e}")
         return 1
 
     try:
-        hostname = get_hostname(hostname_str)
+        hostname = get_hostname(hostname_str, zone)
     except DoesNotExist:
-        print(f"Error: Hostname '{hostname_str}' not found.")
+        print(f"Error: Hostname '{hostname_str}' in zone '{zone}' not found.")
         return 1
 
     # Get new TTLs