[mcllerena]

This PR implements the following database getter methods for analysis and querying:

• get_config() retrieves one configuration entry or all entries; missing keys raise NotFoundError.
• get_custom_columns() returns custom columns, optionally filtered by class.
• get_metadata() retrieves metadata for objects, memberships, or data, with optional class and property filters.
• get_property_unit() resolves a property’s unit; returns an empty string when no unit value is set.
• get_text() retrieves text records for a data ID, optionally filtered by class ID.
• get_unit() returns the full unit record; raises NotFoundError when the ID is missing.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.28%. Comparing base (73e7fab) to head (360717a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   96.23%   96.28%   +0.04%     
==========================================
  Files          22       22              
  Lines        3587     3630      +43     
==========================================
+ Hits         3452     3495      +43     
  Misses        135      135              

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