[driver] sqla results are not dict-like anymore

[dionhaefner]

See https://pydoc.dev/sqlalchemy/latest/sqlalchemy.engine.row.Row.html

Fixes #295

[dionhaefner]

Bugs prevented by mypy: 0
Hours wasted debugging mypy issues: too damn many

[codecov]

Codecov Report

Merging #296 (03344ff) into main (964a72b) will increase coverage by 0.00%.
The diff coverage is 98.52%.

@@           Coverage Diff           @@
##             main     #296   +/-   ##
=======================================
  Coverage   98.67%   98.68%           
=======================================
  Files          48       49    +1     
  Lines        2193     2207   +14     
  Branches      292      304   +12     
=======================================
+ Hits         2164     2178   +14     
  Misses         19       19           
  Partials       10       10           

Impacted Files	Coverage Δ
terracotta/__init__.py	100.00% <ø> (ø)
terracotta/cog.py	80.00% <ø> (ø)
terracotta/profile.py	100.00% <ø> (ø)
terracotta/scripts/optimize_rasters.py	95.94% <85.71%> (ø)
terracotta/scripts/connect.py	93.33% <91.66%> (ø)
terracotta/raster.py	97.14% <93.33%> (ø)
terracotta/server/rgb.py	96.07% <95.45%> (ø)
terracotta/cache.py	100.00% <100.00%> (ø)
terracotta/client/flask_api.py	100.00% <100.00%> (ø)
terracotta/cmaps/generate_cmaps.py	100.00% <100.00%> (ø)
... and 37 more

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[dionhaefner]

Behavior changes:

• Remote SQLite databases are now downloaded as soon as the driver is instantiated
• More robust behavior when catching exceptions inside connect blocks

[j08lue]

Yikes, @dionhaefner, those issues with SQLite files not getting released have haunted me before - on Linux, though. https://github.com/DHI-GRAS/terracotta/actions/runs/4055501441/jobs/6978731806#step:11:588

Never got to dig deeper because we migrated to use MySQL everywhere.

Wonder how you can force the underlying SQLite library to release the file, like https://stackoverflow.com/a/12679840/512111 (C#) or https://stackoverflow.com/a/59483095/512111 or https://stackoverflow.com/questions/6134980/file-locks-in-sqlite...

[dionhaefner]

Hallelujah.