I had to modify the docker-compose.yml file to the following in order to get this app working, specifically to allow the adminpls docker instance to connect to the local postgresql database. If I did not make this change, then the adminpls container could not connect to the local postgresql database.

services:
  adminpls:
    build: .
    image: adminpls:v1
    container_name: adminpls
    hostname: adminpls
    restart: always
    ports:
      - 8123:5000
    environment:
      - TZ=America/Guayaquil
      - APP_SETTINGS_MODULE=config.prod
    network_mode: "host"
    # networks setup depends on intercomm between other container stacks. Depends on declaration near the end of this file. This is optional
    # it's required if you setup a proxy reverse like nginx or connection to a DB inside the same machine
    # networks:
    #   master_network: # this is the network name

# setup other packages/services like db, proxy reverse, etc.
# setup network if required look at the "networks" section above
# networks:
#   master_network:
#     external: True

The change from the original file involves the addition of the following directive:

    network_mode: "host"

The docker compose command specified in the README.md does not work.

I had to run the following command to get the docker image to build and run.

sudo docker compose up

I have noted that the time stamp in the withdrawals table/panel of the Grafana validator stats dashboard was incorrect by an amount equal to my time zone.
This problem was also observed in other panels of the Grafana validator stats dashboard (eg. Wallet Balance History panel, all 3 of the Validator Rewards bar chart panels).

I fixed the Wallet Balance History by changing the query from

SELECT 
"timeStamp", 
"index",
"blockNumber", 
"validatorIndex",
amount * $pls_precision as PLS, 
amount * $pls_precision * $pls_price as USD,
"priceUSD" as "$ at W"

FROM pls_validator_withdrawals WHERE address = '$pls_wallet'
order by 2 desc

to

SELECT 
"timeStamp" - interval 'x hour' as timeStamp, 
"index",
"blockNumber", 
"validatorIndex",
amount * $pls_precision as PLS, 
amount * $pls_precision * $pls_price as USD,
"priceUSD" as "$ at W"

FROM pls_validator_withdrawals WHERE address = '$pls_wallet'
order by 2 desc

where x equals the number of hours added by Grafana to the time stamp recorded in the postgresql database by the pls_admin app.

I implemented similar changes to the underlying queries of other affected Grafana panels that reference either a date or timestamp field from the postgresql database source.

The above query modifications are, IMHO, a hack and clumsy. It seems to me that it would be better to have the pls_admin app write UTC timestamps to the database.

The following commands do not work:

docker exec -it adminpls enable_cron.sh

and

docker exec -it adminpls disable_cron.sh

I ran the following command instead to keep the db synced.

docker exec -it adminpls python3 -m flask scheduler