[Bug] Import JSON config with DuckDB doesn't work properly

**Describe the bug**

Importing a JSON config in the DuckDB demo can fail on 2 scenarios from what I've tested so far.

**To Reproduce**
Steps to reproduce the behavior:
1. Add at least one dataset to kepler.gl, which includes a timestamp.
2. Add a filter on the timestamp to have a timeline.
3. Export the map as a JSON config.
4. When importing the map from the save JSON config, it fails.
1. The first error is not related to the timestamp filter and happens no matter what:
```
Error: IO Error: GDAL Error (4): `-w9n0uh' not recognized as a supported file format.
```
2. After removing the prefix `-` to only keep `w9n0uh` everywhere in the JSON config, the import works if no timestamp filter was present. However, if a timestamp was present while exporting the JSON config, the following error is encountered:
```
Error: IO Error: GDAL Error (4): `w9n0uh' not recognized as a supported file format.
```

**Expected behavior**
Importing a map should work and should also include the timestamp filter.

**Desktop (please complete the following information):**
- OS: macOS 15.5
- Browser: Firefox
- Version: 3.1.8