Free metadata for client / location / generator / station

[pferrariuy]

Add free-metadata tables for:

• [x] client
• [x] location
• [x] generator
• [x] station

The free metadata columns will be use for the differente invereters / cretificate services to store / retrieve data that are specific for each one of them, and will allow to store any type of data in required by future implementations.

[pferrariuy]

At the Java code, the changes will uploaded initially by the following issues:

• https://github.com/Renovus-Tech/solarec-java/issues/4
• https://github.com/Renovus-Tech/solarec-java/issues/5
• https://github.com/Renovus-Tech/solarec-java/issues/11
• https://github.com/Renovus-Tech/solarec-java/issues/12
• https://github.com/Renovus-Tech/solarec-java/issues/13

[pferrariuy]

Tables to be use:

CREATE TABLE cli_metadata (
  cli_id INTEGER NOT NULL,
  metadata_name VARCHAR(100) NOT NULL,
  metadata_title VARCHAR(200) NULL,
  metadata_value VARCHAR(200) NULL,
  metadata_date_added timestamp with time zone NULL
);--

CREATE TABLE loc_metadata (
  cli_id INTEGER NOT NULL,
  loc_id INTEGER NOT NULL,
  metadata_name VARCHAR(100) NOT NULL,
  metadata_title VARCHAR(200) NULL,
  metadata_value VARCHAR(200) NULL,
  metadata_date_added timestamp with time zone NULL
);--

CREATE TABLE gen_metadata (
  cli_id INTEGER NOT NULL,
  gen_id INTEGER NOT NULL,
  metadata_code VARCHAR(100) NOT NULL,
  metadata_title VARCHAR(200) NULL,
  metadata_value VARCHAR(200) NULL,
  metadata_date_added timestamp with time zone NULL
);--

CREATE TABLE sta_metadata (
  cli_id INTEGER NOT NULL,
  sta_id INTEGER NOT NULL,
  metadata_name VARCHAR(100) NOT NULL,
  metadata_title VARCHAR(200) NULL,
  metadata_value VARCHAR(200) NULL,
  metadata_date_added timestamp with time zone NULL
);--