add query to remove dangling docker images

migrate/20240724_lantern_doctor_queries.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+Sequel.migration do
+  up do
+    # check duplicate sources for embedding jobs
+    run "INSERT INTO lantern_doctor_query (id, name, db_name, schedule, condition, fn_label, type, severity, response_type)
+         VALUES ('0e5fab85-71f6-89b7-96cf-f1e8e1074389', 'Cleanup dangling docker images', 'postgres', '0 9 * * *', 'unknown', 'remove_dangling_images', 'system', 'error', 'rows')"
+
+    # Create semaphores for all lantern doctors to sync system queries
+    run "INSERT INTO semaphore (id, strand_id, name) SELECT gen_random_uuid(), id, 'sync_system_queries' FROM strand s WHERE s.prog = 'Lantern::LanternDoctorNexus'"
+  end
+end

rhizome/lantern/bin/doctor/run_query

@@ -141,6 +141,15 @@ SQL
 
     output
   end
+
+  def self.remove_dangling_images(_db, _query_user)
+    r("sudo docker image prune -af")
+    ""
+  end
+
+  def self.remove_dangling_index_files(_db, _query_user)
+    r("sudo find /var/lib/lantern-data/data/ -name 'ldb-index*' -type f -mmin +240 -delete >/tmp/ldb-index-cleanup-logs 2>&1 && echo "" || cat /tmp/ldb-index-cleanup-logs").chomp.strip
+  end
 end
 
 exit_code = 0