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added --clean deleted command to the documentation

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lujoh 2023-10-18 02:03:17 -04:00
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docs/admin/Maintenance.md
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@ -60,16 +60,14 @@ to finish the recomputation.
## Removing large deleted objects
Command: `nominatim admin --clean-deleted --age <PostgreSQL Time Interval>`
Nominatim refuses to delete very large areas because often these deletions are
accidental and are reverted within hours. Instead the deletions are logged in
the `import_polygon_delete` table and left to the administrator to clean up.
There is currently no command to do that. You can use the following SQL
query to force a deletion on all objects that have been deleted more than
a certain timespan ago (here: 1 month):
To run this command you will need to pass a PostgreSQL time interval to the age
parameter. For example to delete any objects that have been deleted more than a
month ago you would run:
`nominatim admin --clean-deleted --age '1 month'`
```sql
SELECT place_force_delete(p.place_id) FROM import_polygon_delete d, placex p
WHERE p.osm_type = d.osm_type and p.osm_id = d.osm_id
and age(p.indexed_date) > '1 month'::interval
```