datastore: canonical block 8999999 not found in e3 data storage

Running standalone `rpcdaemon` at commit 0013a82cb8f9e51875c01610c691c7e464883330 using local E3 beta1 data storage, the following RPC integration test fails:
```
python3 ./run_tests.py --api-list eth_call --run-single-test 1 --dump-response

Runs tests in parallel
0411. http ::eth_call/test_01.json Failed
TEST ABORTED!

Test time-elapsed: 0:00:03.398057
Number of executed tests: 1/1156
Number of NOT executed tests: 0
Number of success tests: 0
Number of failed tests: 1
```
producing the following response diff:
```
{
- result: "0x"
+ error: {
+ code: 100
+ message: "block not found"
+ }
}
```
The root cause is canonical block 8999999 not found in `DataModel` abstraction.