When 'Overwrite existing activities' is checked, duplicate activities are
re-extracted and replaced instead of silently skipped:
- Deletes {id}.json, .geojson, .timeseries.json from activities/ and _merged/
- Removes the stale index summary and dedup cache entry
- Ingests the new file fresh via ingest_parsed
- Reports 'overwritten' (↺) status in the SSE stream vs 'imported' (↓)
- done event includes 'overwritten' count; UI shows it alongside 'added'
Davide Scaini
764da09130