refactor(coderd): collapse activityBumpWorkspace into a single query (#9652)

* Adds unit-style tests for activityBumpWorkspace
* Ports logic of activityBumpWorkspace to a SQL query
* Updates activityBumpWorkspace to call above query

coderd/database/queries/activitybump.sql

@@ -0,0 +1,40 @@
+-- We bump by the original TTL to prevent counter-intuitive behavior
+-- as the TTL wraps. For example, if I set the TTL to 12 hours, sign off
+-- work at midnight, come back at 10am, I would want another full day
+-- of uptime.
+-- name: ActivityBumpWorkspace :exec
+WITH latest AS (
+	SELECT
+		workspace_builds.id::uuid AS build_id,
+		workspace_builds.deadline::timestamp AS build_deadline,
+		workspace_builds.max_deadline::timestamp AS build_max_deadline,
+		workspace_builds.transition AS build_transition,
+		provisioner_jobs.completed_at::timestamp AS job_completed_at,
+		(workspaces.ttl / 1000 / 1000 / 1000 || ' seconds')::interval AS ttl_interval
+	FROM workspace_builds
+	JOIN provisioner_jobs
+		ON provisioner_jobs.id = workspace_builds.job_id
+	JOIN workspaces
+		ON workspaces.id = workspace_builds.workspace_id
+	WHERE workspace_builds.workspace_id = @workspace_id::uuid
+	ORDER BY workspace_builds.build_number DESC
+	LIMIT 1
+)
+UPDATE
+	workspace_builds wb
+SET
+	updated_at = NOW(),
+	deadline = CASE
+		WHEN l.build_max_deadline = '0001-01-01 00:00:00+00'
+		THEN NOW() + l.ttl_interval
+		ELSE LEAST(NOW() + l.ttl_interval, l.build_max_deadline)
+	END
+FROM latest l
+WHERE wb.id = l.build_id
+AND l.job_completed_at IS NOT NULL
+AND l.build_transition = 'start'
+-- We only bump if workspace shutdown is manual.
+AND l.build_deadline != '0001-01-01 00:00:00+00'
+-- We only bump when 5% of the deadline has elapsed.
+AND l.build_deadline - (l.ttl_interval * 0.95) < NOW()
+;