In few words, Query Executor runs arbitrary SELECT queries on top of the PostgreSQL database, specifically BLOCKS table.

The structure of the BLOCKS table is the following:

TABLE blocks (
     "time" timestamp with time zone NOT NULL,
     number numeric NOT NULL,
     hash bytea NOT NULL,
     parent_hash bytea NOT NULL,
     gas_limit numeric NOT NULL,
     gas_used numeric NOT NULL,
     miner bytea NOT NULL,
     difficulty numeric NOT NULL,
     total_difficulty numeric NOT NULL,
     nonce bytea NOT NULL,
     size numeric NOT NULL
)

Server configuration is located in the config.json file in the root directory. In order to create the table BLOCKS and fill with initial data, change the database.initialize to true. Change the parameters and run following commands:

make build

./bin/dune

Frontend configuration is located in the frontend/config.json. Change the parameters and open the frontend/index.html in your browser.