Better ORM context information

[skearnes]

• Better column names: _polymorphic_type is now ord_schema_context and the values are more readable to match the ORD schema definitions.
• Added a "Database structure" section to the ORM readme.

[codecov[bot]]

Codecov Report

Merging #669 (7f908e2) into main (09c82cb) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #669      +/-   ##
==========================================
+ Coverage   69.59%   69.64%   +0.04%     
==========================================
  Files          23       23              
  Lines        2276     2273       -3     
  Branches      567      566       -1     
==========================================
- Hits         1584     1583       -1     
+ Misses        586      585       -1     
+ Partials      106      105       -1     

Impacted Files	Coverage Δ
ord_schema/orm/mappers.py	96.81% <ø> (+1.19%)	:arrow_up:
ord_schema/orm/rdkit_mappers.py	92.07% <100.00%> (ø)

[ipendlet]

Tests validated and I was able to follow the changes. I am not sure how these might effect the existing files though. Is there a way to make sure that the modifications to the schema don't break passed versions of the protobuff? Or is this something that protobuff handles naturally?

[skearnes]

Tests validated and I was able to follow the changes. I am not sure how these might effect the existing files though. Is there a way to make sure that the modifications to the schema don't break passed versions of the protobuff? Or is this something that protobuff handles naturally?

I think you are referring to the changes in #666?