Refactor config import logic for legacy column references

Ensure legacy column references are renamed only if the config file has changed.  Fix unnecessary config scan in importConfigs, was causing the container to run at over 80% CPU.  

QA tested locally, all test passed!

server/initialise.py

@@ -230,17 +230,14 @@ def importConfigs(pm, db, all_plugins):
     # get config file name
     config_file = Path(fullConfPath)
 
-    # Only import file if the file was modifed since last import.
+    # Only import file if the file was modified since last import.
     # this avoids time zone issues as we just compare the previous timestamp to the current time stamp
 
     # rename settings that have changed names due to code cleanup and migration to plugins
     # renameSettings(config_file)
 
-    # rename legacy DB column references in user config values (e.g. templates, WATCH lists)
-    renameColumnReferences(config_file)
-
     fileModifiedTime = os.path.getmtime(config_file)
-
+    
     mylog("debug", ["[Import Config] checking config file "])
     mylog("debug", ["[Import Config] lastImportedConfFile     :", conf.lastImportedConfFile],)
     mylog("debug", ["[Import Config] fileModifiedTime         :", fileModifiedTime])
@@ -249,6 +246,9 @@ def importConfigs(pm, db, all_plugins):
         mylog("debug", ["[Import Config] skipping config file import"])
         return pm, all_plugins, False
 
+    # rename legacy column references only when the config file actually changed
+    renameColumnReferences(config_file)
+
     # Header
     updateState("Import config", showSpinner=True)