Postgres CDC example

This is a very simple example of PostgreSQL CDC via amazing Debezium Connector.

Commands reference:

first of all, run:
```
docker-compose up --build
```

to get the jupyter token, please run:

docker-compose -f docker-compose.yml exec jupyter-local jupyter notebook list

In answer you will receive:

Currently running servers:
http://0.0.0.0:8888/?token={here goes your token} :: /home/jovyan

Please copy the provided link to the browser.

Data Schema

Customers:

Column      |          Type          |                       Modifiers
------------+------------------------+--------------------------------------------------------
id          | integer                | not null default nextval('customers_id_seq'::regclass)
first_name  | character varying(255) | not null
last_name   | character varying(255) | not null
email       | character varying(255) | not null

Orders

Column      |  Type   |                      Modifiers
------------+---------+-----------------------------------------------------
id          | integer | not null default nextval('orders_id_seq'::regclass)
order_date  | date    | not null
purchaser   | integer | not null
quantity    | integer | not null
product_id  | integer | not null

Products

Column       |          Type          |                       Modifiers
-------------+------------------------+-------------------------------------------------------
id           | integer                | not null default nextval('products_id_seq'::regclass)
name         | character varying(255) | not null
description  | character varying(512) |
weight       | double precision       |

Products on hand:

Column      |  Type   | Modifiers
------------+---------+-----------
product_id  | integer | not null
quantity    | integer | not null

Misc

To connect to the database directly, please use:

docker-compose  \
  -f docker-compose.yml \
  exec postgres env PGOPTIONS="--search_path=inventory" \
  bash -c 'psql -U $POSTGRES_USER postgres'