moving geocoding to a background task

README.md

@@ -179,6 +179,31 @@ Data is sourced from the UK Government's [Compare School Performance](https://ww
 
 **Important**: When using real data, please comply with the [terms of use](https://www.compare-school-performance.service.gov.uk/download-data) and data protection regulations.
 
+## Scheduled Jobs
+
+### Geocoding Schools (Cron Job)
+
+School postcodes are geocoded by a scheduled job, not on-demand. This improves performance and reduces API calls.
+
+**Setup the cron job** (runs weekly on Sunday at 2am):
+
+```bash
+# Edit crontab
+crontab -e
+
+# Add this line (adjust paths as needed):
+0 2 * * 0 cd /path/to/school_compare && /path/to/venv/bin/python scripts/geocode_schools.py >> /var/log/geocode_schools.log 2>&1
+```
+
+**Manual run:**
+```bash
+# Geocode only schools missing coordinates
+python scripts/geocode_schools.py
+
+# Force re-geocode all schools
+python scripts/geocode_schools.py --force
+```
+
 ## License
 
 MIT License - feel free to use this project for educational purposes.