refac: production mode startup logic

api/.vscode/launch.json

@@ -16,6 +16,9 @@
                 "PYDEVD_DISABLE_FILE_VALIDATION": "1",
                 "LOG_LEVEL": "DEBUG",
                 "WEBDAV__CACHE_TTL": "30",
+                // "PRODUCTION_MODE": "true",
+                // "WEBDAV__RETRIES": "5",
+                // "WEBDAV__RETRY_DELAY": "1",
             },
             "justMyCode": true
         }

api/ovdashboard_api/app.py

@@ -53,15 +53,23 @@ if SETTINGS.production_mode:
         name="frontend",
     )
 
-    for _ in range(SETTINGS.webdav.retries):
+    def check_webdav(retry: int) -> bool | None:
         if WebDAV._webdav_client.check(""):
-            break
+            return True
 
         _logger.warning(
-            "Waiting for WebDAV connection to %s ...",
+            "WebDAV connection to %s failed (try %d of %d)",
             repr(SETTINGS.webdav.url),
+            retry + 1,
+            SETTINGS.webdav.retries,
         )
-        time.sleep(30)
+
+        if retry < SETTINGS.webdav.retries:
+            _logger.debug("Retrying in %d seconds ...", SETTINGS.webdav.retry_delay)
+            time.sleep(SETTINGS.webdav.retry_delay)
+
+    if not any(check_webdav(n) for n in range(SETTINGS.webdav.retries)):
+        raise ConnectionError("WebDAV connection failed")
 
 else:
     assert WebDAV._webdav_client.check("")

api/ovdashboard_api/core/settings.py

@@ -54,6 +54,7 @@ class WebDAVSettings(DAVSettings):
 
     disable_check: bool = False
     retries: int = 20
+    retry_delay: int = 30
     prefix: str = "/ovdashboard"
 
     @property