Add rake task to help with manual index management

lib/tasks/db_sp_return_logs_index.rake

@@ -0,0 +1,39 @@
+namespace :db do
+  desc 'Tear down and recreate the sp_return_logs index on devices'
+  task rebuild_sp_return_logs_index: :environment do
+    ## Set statement timeout to 1 hour
+    ActiveRecord::Base.connection.execute('SET statement_timeout = 3600000')
+
+    ## First, delete the old, invalid index if it exists
+    existing_index_result = ActiveRecord::Base.connection.execute <<~SQL
+      SELECT indexname
+      FROM pg_indexes
+      WHERE indexname = 'index_sp_return_logs_on_issuer_and_requested_at'
+    SQL
+    if existing_index_result.num_tuples > 0
+      puts 'Index index_sp_return_logs_on_issuer_and_requested_at exists, dropping...'
+      ActiveRecord::Base.connection.execute <<~SQL
+        DROP INDEX CONCURRENTLY index_sp_return_logs_on_issuer_and_requested_at
+      SQL
+    end
+
+    ## Run the SQL from the migration to create the new index
+    puts 'Creating new index_sp_return_logs_on_issuer_and_requested_at index'
+    ActiveRecord::Base.connection.execute <<~SQL
+      CREATE INDEX CONCURRENTLY "index_sp_return_logs_on_issuer_and_requested_at"
+      ON "sp_return_logs" ("issuer", "requested_at")
+    SQL
+  end
+
+  desc 'Check for an invalid sp_return_logs index on devices and print the result'
+  task check_for_invalid_sp_return_logs_index: :environment do
+    results = ActiveRecord::Base.connection.execute <<~SQL
+      SELECT * FROM pg_class, pg_index
+      WHERE pg_index.indisvalid = false
+        AND pg_index.indexrelid = pg_class.oid
+        AND pg_class.relname = 'index_sp_return_logs_on_issuer_and_requested_at'
+    SQL
+
+    puts "Found #{results.num_tuples} invalid index(es)"
+  end
+end