Fix fill_db.ts to fill all indices

[acarbonetto]

Issue #, if available:

N/A

Description of changes:

When running fill_database function, we were pushing data more than once into the database at key.

Observed keys to set by adding a console.log(key) at line 24 of fill_db.ts.

~/git/bq/babushka/benchmarks> ./install_and_test.sh -no-tls
/opt/homebrew/bin/python3

up to date, audited 18 packages in 233ms

found 0 vulnerabilities

> [email protected] flush
> node flush_db.js --host localhost

Flushing localhost

> [email protected] fill
> node fill_db.js --dataSize 100 --host localhost

Filling localhost with data size 100
0
0
0
... repeat x1000
1001
1001
1001
... repeat x1000
etc

Expected:

0
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
18000
...

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.