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Persistent based event sourcing.

TODO:

+ [x] Add event ordering code.
+ [ ] Prove correctness of event ordering.
+ [ ] I'd like to also add the reapply in a transaction
      code, we'd need to refactor so the tables are known
      by the system so we can automatically generate a truncate query.
+ [ ] Upstream Database.Esqueleto.* to the right package

## Usage

### Tools
Enter the nix shell.
```
nix-shell
```
You can checkout the makefile to see what's available:
```
cat makefile
```

### Running
```
make run
```

### Fast filewatch which runs tests
```
make ghcid
```