diff --git a/cloud/bmaas/bmdb/model/queries_base.sql b/cloud/bmaas/bmdb/model/queries_base.sql
index 60d1737..8257fb8 100644
--- a/cloud/bmaas/bmdb/model/queries_base.sql
+++ b/cloud/bmaas/bmdb/model/queries_base.sql
@@ -42,3 +42,29 @@
   AND session_id = $2
   AND process = $3;
 
+
+-- name: WorkHistoryInsert :exec
+-- Insert an entry into the work_history audit table.
+INSERT INTO work_history (
+    machine_id, process, event, timestamp, failed_cause
+) VALUES (
+    $1, $2, $3, now(), $4
+);
+
+-- name: WorkBackoffInsert :exec
+-- Upsert a backoff for a given machine/process.
+INSERT INTO work_backoff (
+    machine_id, process, cause, until
+) VALUES (
+    $1, $2, $3, now() + (sqlc.arg(seconds)::int * interval '1 second')
+) ON CONFLICT (machine_id, process) DO UPDATE SET
+    cause = $3,
+    until = now() + (sqlc.arg(seconds)::int * interval '1 second')
+;
+
+-- name: ListHistoryOf :many
+-- Retrieve full audit history of a machine.
+SELECT *
+FROM work_history
+WHERE machine_id = $1
+ORDER BY timestamp ASC;
\ No newline at end of file