Summary

• Rename /admin/db-size to /admin/database for future extensibility
• Add purge action: NULL out run_track_activity_jsonl for older rows, with radio buttons (10/25/50/100/250/500) showing MB savings per retention level
• Add vacuum button: runs VACUUM FULL task_item to rewrite the table and reclaim disk space after purging

Test plan

• Navigate to /admin/database — page loads with size info and purge options
• Verify each radio button shows correct purgeable row count and MB savings
• Purge with a retention level and verify success banner
• Click Vacuum and verify the per-table breakdown reflects reclaimed space
• Verify old URL /admin/db-size no longer works (404)
• Verify non-admin users get 403

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