add db relationship diagram to doc

[pindge]

Reason for this pull request

any odc dba needs to explorer the database to workout where the information is stored in the database, as odc API does not cover all the queries.

Proposed changes

• add database entity relationship diagram to odc doc, concept page

• Tests added / passed
• Fully documented, including docs/about/whats_new.rst for all changes

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📚 Documentation preview 📚: https://datacube-core--1350.org.readthedocs.build/en/1350/

[codecov]

Codecov Report

Base: 92.34% // Head: 92.34% // No change to project coverage 👍

Coverage data is based on head (30a258a) compared to base (54491c4).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1350   +/-   ##
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  Coverage    92.34%   92.34%           
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  Files          127      127           
  Lines        13583    13583           
========================================
  Hits         12543    12543           
  Misses        1040     1040           

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[omad]

I love the idea of documenting the database schema, but I don't like that it's all hand written in swagger. (And is missing a couple of columns and relationships)

Here's an auto-generated version of the same diagram using SchemaSpy. It contains both the .dot format which can be used with the Sphinx Graphviz extension. Or probably better, is to use the generated svg directly, and include documentation next to it for updating the diagram if necessary.

[pindge]

I love the idea of documenting the database schema, but I don't like that it's all hand written in swagger. (And is missing a couple of columns and relationships)

Here's an auto-generated version of the same diagram using SchemaSpy. It contains both the .dot format which can be used with the Sphinx Graphviz extension. Or probably better, is to use the generated svg directly, and include documentation next to it for updating the diagram if necessary.

Thank you, I have updated the pr

[omad]

Thanks Pin :)