feat: authoritative plugin fields - fix devLastIP

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

server/db/authoritative_handler.py

@@ -74,7 +74,7 @@ def get_plugin_authoritative_settings(plugin_prefix):
         return {"set_always": [], "set_empty": []}
 
 
-def can_overwrite_field(field_name, current_value, current_source, plugin_prefix, plugin_settings, field_value):
+def can_overwrite_field(field_name, current_value, current_source, plugin_prefix, plugin_settings, field_value, allow_override_if_changed=False):
     """
     Determine if a plugin can overwrite a field.
 
@@ -121,7 +121,14 @@ def can_overwrite_field(field_name, current_value, current_source, plugin_prefix
         return False
 
     # Rule 5: Default - overwrite if current value empty
-    return current_value in empty_values
+    if current_value in empty_values:
+        return True
+
+    # Rule 6: Optional override flag to allow overwrite if value changed (devLastIP)
+    if allow_override_if_changed and field_value != current_value:
+        return True
+
+    return False
 
 
 def get_overwrite_sql_clause(field_name, source_column, plugin_settings):

server/scan/device_handling.py

@@ -121,6 +121,7 @@ FIELD_SPECS = {
         "empty_values": ["", "null", "(unknown)", "(Unknown)"],
         "priority": ["ARPSCAN", "NEWDEV", "N/A"],
         "default_value": "0.0.0.0",
+        "allow_update_if_changed": True,
     },
 
     # ==========================================================
@@ -304,6 +305,7 @@ def update_devices_data_from_scan(db):
                     plugin_prefix=source_prefix,
                     plugin_settings=plugin_settings,
                     field_value=new_value,
+                    allow_override_if_changed=spec.get("allow_override_if_changed", False)
                 ):
                     # Build UPDATE dynamically
                     update_cols = [f"{field} = ?"]