Issue262

[nickeopti]

This fixes #262.

We use functionality from SQLAlchemy 1.4, and apparently ColumnCollection.values() was missing in 1.4.0, but added back in 1.4.1.

[codecov]

Codecov Report

Merging #263 (157ba3c) into main (343a946) will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #263      +/-   ##
==========================================
+ Coverage   98.57%   98.76%   +0.19%     
==========================================
  Files          49       49              
  Lines        2175     2194      +19     
  Branches      304      306       +2     
==========================================
+ Hits         2144     2167      +23     
+ Misses         19       17       -2     
+ Partials       12       10       -2     

Impacted Files	Coverage Δ
terracotta/exceptions.py	100.00% <0.00%> (ø)
terracotta/drivers/base_classes.py	100.00% <0.00%> (ø)
terracotta/drivers/terracotta_driver.py	100.00% <0.00%> (ø)
terracotta/drivers/sqlite_remote_meta_store.py	100.00% <0.00%> (ø)
terracotta/drivers/relational_meta_store.py	98.92% <0.00%> (+0.01%)	⬆️
terracotta/server/flask_api.py	96.20% <0.00%> (+5.66%)	⬆️

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