Refactor backup UI actions and update cache file

This commit refactors the backup UI actions in the `actions.py` file. It removes unnecessary code and improves the logic for setting the `date_last_backup` value. Additionally, the cache file in the `utils.py` file is updated to include the current date and time.

src/common/core/backup/ui/actions.py

@@ -1,4 +1,3 @@
-from datetime import datetime
 from json import loads
 from logging import getLogger
 from traceback import format_exc
@@ -29,13 +28,8 @@ def pre_render(**kwargs):
                 ret["list_backup_files"]["data"]["file name"] = []
             ret["list_backup_files"]["data"]["file name"].append(backup_file)
 
-        if ret["list_backup_files"]["data"]:
-            ret["date_last_backup"]["value"] = datetime.strptime(
-                "-".join(ret["list_backup_files"]["data"]["file name"][len(ret["list_backup_files"]["data"]["file name"]) - 1].split("-")[2:]).replace(
-                    ".zip", ""
-                ),
-                "%Y-%m-%d_%H-%M-%S",
-            ).isoformat()
+        if data.get("date"):
+            ret["date_last_backup"]["value"] = data["date"]
     except BaseException as e:
         logger.debug(format_exc())
         logger.error(f"Failed to get backup metrics: {e}")

src/common/core/backup/utils.py

@@ -42,6 +42,7 @@ def update_cache_file(db: Database, backup_dir: Path) -> str:
     """Update the cache file in the database."""
     backup_data = loads(db.get_job_cache_file("backup-data", "backup.json") or "{}")
     backup_data["files"] = sorted([file.name for file in backup_dir.glob("backup-*.zip")])
+    backup_data["date"] = datetime.now().astimezone().isoformat()
     content = dumps(backup_data, indent=2).encode()
     checksum = bytes_hash(content)
     err = db.upsert_job_cache(None, "backup.json", content, job_name="backup-data", checksum=checksum)