This will be the last release before ComposeDB Beta goes live on Mainnet early next week. The `Model Versioning` feature provides backwards compatibility, even as future updates are made to the models protocol. The rollout involves a wipe of all models and ComposeDB data currently on Clay testnet, with breaking changes to model indexing and configuration table structure.

This release will allow devs to experiment with the HistorySync feature.

### Model Versioning & Table Config

The new table config structure includes a `version` field. Follow these steps below to update:

1. Stop the node & update packages  
2. If using `SQLite` delete the existing database found at:
   
   ```
   ~/.ceramic/indexing.sqlite
   ```

3. If using `Postgres` connect to the DB and drop the following tables: `ceramic_models`, `ceramic_config`, and any tables starting with `kjz`(the index table).

Example Postgres Structure:

```
 Schema |                              Name               |   Type   |  Owner
--------+-------------------------------------------------+----------+---------
 public | ceramic_config                                  | table    | ceramic
 public | ceramic_models                                  | table    | ceramic
 public | kjzl6hvfrbw6c8c48hg1u62lhnc95g4ntsl...vsbjtw374 | table    | ceramic
```

4. Start up the node: you'll see `ceramic_models` and `ceramic_config` tables be created as part of the startup message.

5. Recreate your models using the latest [ComposeDB tooling](https://composedb.js.org/docs/0.4.x/guides/data-modeling/introduction-to-modeling?ref=blog.ceramic.network)

### History Sync

History Sync enables developers to index models and sync all history for the model, enabling full backwards and forwards composability. History Sync will be run by default after the Beta release next week, but if you want a sneak preview, you can try out History Sync by adding `CERAMIC_ENABLE_EXPERIMENTAL_SYNC='true’` when [starting your daemon.](https://composedb.js.org/docs/0.4.x/set-up-your-environment?ref=blog.ceramic.network#run-a-ceramic-node)

* * *

### ComposeDB Beta on Mainnet

Thank you for your incredible patience and excitement leading up to our Mainnet launch of ComposeDB Beta on February 28th. We are less than a week away! Stay tuned for more details.