Draft: #645 added run_at_timezone field to chain and add_job #646

[gaslitbytech]

Continuing on from cybertec-postgresql#646 in my own fork.

Added new run_at_timezone field to the chain table to allow for optional separate time zone per chain. The default of current_setting('timezone)` will make this change backwards compatible.

Todo:

• add unit tests. I haven't figured out how to run the unit tests locally yet. Use the following to start postgres in docker before letting vscode run the unit tests in the _test.go files.

#!/usr/bin/env bash
set -euo pipefail # Exit with nonzero exit code if anything fails
set -x # Display commands and their arguments as they are executed.

docker rm -f postgres-pg-timetable-test || true
docker run --rm --name postgres-pg-timetable-test \
-p 5432:5432 \
-e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=mysecretpassword \
--add-host host.docker.internal:host-gateway \
--net host \
-d postgres:16.2

timeout 90s /usr/bin/env bash -c "until docker exec postgres-pg-timetable-test pg_isready ; do sleep 5 ; done" # wait for db to be ready
docker exec postgres-pg-timetable-test psql -U postgres -c "CREATE USER scheduler PASSWORD 'somestrong';"
docker exec postgres-pg-timetable-test psql -U postgres -c "CREATE DATABASE timetable OWNER scheduler;"
docker exec postgres-pg-timetable-test psql -U postgres -c "SELECT version();"
docker logs -f postgres-pg-timetable-test

• test migrations.
• add docs