# \[20190204202349\] Timer Substacks, On-Demand Dynamo

**URL:** <https://community.convox.com/t/20190204202349-timer-substacks-on-demand-dynamo/53>\
**Category:** Releases\
**Created:** [February 4, 2019, 10:06pm UTC](https://community.convox.com/t/20190204202349-timer-substacks-on-demand-dynamo/53 "2019-02-04T22:06:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ddollar](https://yyz1.discourse-cdn.com/flex029/user_avatar/community.convox.com/ddollar/32/3_2.png) [@ddollar](https://community.convox.com/u/ddollar)\
**Post date:** [February 4, 2019, 10:06pm UTC](https://community.convox.com/t/20190204202349-timer-substacks-on-demand-dynamo/53/1 "2019-02-04T22:06:47Z")

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This release moves app timers into sub-stacks to prevent reaching template size limits and changes the Rack’s DynamoDB tables to On-Demand billing mode.

- [#3109](https://github.com/convox/rack/pull/3109) separate timers into substacks [[@ddollar](https://github.com/ddollar)]
- [#3110](https://github.com/convox/rack/pull/3110) use on-demand dynamodb tables [[@ddollar](https://github.com/ddollar)]
- [#3113](https://github.com/convox/rack/pull/3113) use ubuntu as rack base image [[@ddollar](https://github.com/ddollar)]