Implementing Revisioning with SCD2/4

Question

I'm working on a project that is a sort of bill of materials manager that needs to support revisioning of components. After some research, I've stumbled upon slowly changing dimensions type 2 and type 4 which seems like the most appropriate pattern in this use cases.

However, I'm a little bit confused on a couple of concepts:

CREATE TABLE projects (
  id    INTEGER PRIMARY KEY,
  name  TEXT
)

CREATE TABLE components (
  id           INTEGER PRIMARY KEY,
  name         TEXT,
  project_id   INTEGER,
  CONSTRAINT fk_project FOREIGN KEY (project_id) REFERENCES projects (id)
)

If I wanted to implement SCD Type 2, would the components table have the additional columns for start_date , end_date , active ? Or, would Type 2 be adding a revisions table with the same structure as components with the additional columns and Type 4 having a revisions table and a revisions_history table?

Any help would be greatly appreciated!

Answer 1

You can use temporal_tables

System-period data versioning (also known as transaction time or system time) allows you to specify that old rows are archived into another table (that is called the history table).

https://pgxn.org/dist/temporal_tables/