remove Oracle database support

[zhenghaoz]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.06 ⚠️

Comparison is base (fab3c5b) 70.50% compared to head (7f8b921) 70.45%.

❗ Current head 7f8b921 differs from pull request most recent head 4fd7dca. Consider uploading reports for the commit 4fd7dca to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #641      +/-   ##
==========================================
- Coverage   70.50%   70.45%   -0.06%     
==========================================
  Files          63       63              
  Lines       12496    12440      -56     
==========================================
- Hits         8810     8764      -46     
+ Misses       2838     2833       -5     
+ Partials      848      843       -5     

Impacted Files	Coverage Δ
storage/cache/database.go	70.88% <ø> (+0.12%)	⬆️
storage/cache/sql.go	79.73% <ø> (ø)
storage/data/database.go	69.56% <ø> (+0.03%)	⬆️
storage/data/sql.go	78.06% <100.00%> (-0.63%)	⬇️

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